LORD ABBETT TAX FREE INCOME TRUST
485BPOS, 1996-04-25
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                                                      1940 Act File No. 811-6418
                                                     1933 Act File No. 333-01387

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                           ---------------------------


                                    FORM N-14

   
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                       [ ] Pre-Effective Amendment No. __
                       [x] Post-Effective Amendment No. 1
    

                        LORD ABBETT TAX-FREE INCOME TRUST
               (Exact Name of Registrant as Specified in Charter)


                  The General Motors Building, 767 Fifth Avenue
                            New York, New York 10153
                    (Address of Principal Executive Offices)
        Registrant's Telephone Number, Including Area Code: 800-426-1130


                               Kenneth B. Cutler
                          Vice President and Secretary
                       Lord Abbett Tax-Free Income Trust
                          The General Motors Building
                                767 Fifth Avenue
                            New York, New York 10153
                    (Name and Address of Agent for Service)

                  Approximate Date of Proposed Public Offering:
 As soon as practicable after the effective date of the registration statement.


NO FILING  FEE IS  REQUIRED  BECAUSE  AN  INDEFINITE  NUMBER OF SHARES ARE BEING
REGISTERED PURSUANT TO RULE 24f-2 UNDER THE INVESTMENT COMPANY ACT OF 1940.

   
            IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE ON
            THE DATE OF FILING PURSUANT TO PARAGRAPH (b) OF RULE 485.
    


================================================================================
<PAGE>
 
                        LORD ABBETT TAX-FREE INCOME TRUST

                              CROSS-REFERENCE SHEET
                           ITEMS REQUIRED BY FORM N-14

<TABLE>    
<CAPTION>

Part A
Item No.  Item Caption                                                 Prospectus Caption
- --------  ------------                                                 ------------------
<S>   <C>                                                      <C>                                        
1.    Beginning of Registration Statement and Outside          Cover Page of Registration Statement;
      Front Cover Page of Prospectus                           Cover Page of Proxy Statement and
                                                               Prospectus

2.    Beginning and Outside Back Cover Page of                 Table of Contents
      Prospectus

3.    Fee Table, Synopsis and Risk Factors                     Fee Table; Summary of Proposal

4.    Information about the Transaction                        Summary of Proposal; Information
                                                               About the Reorganization

5.    Information about the Registrant                         Summary of Proposal; Comparative
                                                               Information about the Acquiring Fund
                                                               and the Acquired Fund; Additional
                                                               Information; Prospectus of Lord
                                                               Abbett Tax-Free Income Trust dated
                                                               March 1, 1996

6.    Information about the Company Being Acquired             Summary of Proposal; Comparative
                                                               Information about the Acquiring Fund
                                                               and the Acquired Fund

7.    Voting Information                                       Special Meeting of Shareholders of
                                                               the Securities Trust; Notice of Special
                                                               Meeting of Shareholders; Summary of
                                                               Proposal

8.    Interest of Certain Persons and Experts                  Additional Information

9.    Additional Information Required for Reoffering           Not Applicable
      by Persons Deemed to be Underwriters
</TABLE>     
<PAGE>
 
<TABLE>
<CAPTION>

Part B                                                         Statement of Additional
Item No.  Item Caption                                         Information Caption
- --------  ------------                                         -------------------
<S>   <C>                                                      <C>                                        
10.   Cover Page                                               Cover Page

11.   Table of Contents                                        Not Applicable

12.   Additional Information about the Registrant              Cover Page of Proxy Statement and
                                                               Prospectus; Acquiring Fund State-
                                                               ment of Additional Information incor-
                                                               porated by reference.

13.   Additional Information about the Company Being           Cover Page of Proxy Statement and
      Acquired                                                 Prospectus; Acquired Fund Statement
                                                               of Additional Information incor
                                                               porated by reference.
14.   Financial Statements                                     Pro-forma Financial Statements

Part C
Item No.                                                       Part C Caption
- --------                                                       --------------
15.   Indemnification                                          Indemnification
16.   Exhibits                                                 Exhibits
17.   Undertakings                                             Undertakings
Signatures
</TABLE> 
<PAGE>
 
                  [Letterhead of Lord Abbett Securities Trust -
                   Lord Abbett Florida Tax-Free Income Trust]

   
Dear Shareholder:

     You are cordially invited to attend the Special Meeting of Shareholders of
Lord Abbett Securities Trust scheduled to be held on June 19, 1996, at 11:00
a.m., at the General Motors Building, 767 Fifth Avenue, New York, New York. Your
Board of Trustees looks forward to greeting those shareholders who are able to
attend.

     At the meeting, in addition to the appointment of auditors, you will be
asked to approve or disapprove a proposal to combine your Fund with another Lord
Abbett fund which has an investment objective and policies substantially similar
to those of your Fund. The investment policies of the other fund are proposed to
be changed from those of your Fund to provide greater uniformity among the Lord
Abbett-sponsored funds and greater flexibility in the management of your Fund's
portfolio.

     Such proposal, if approved, will eliminate the offering of substantially
identical funds, as well as take advantage of potential economies of scale. In
addition, the proposed combination will be a tax-free reorganization for federal
income tax purposes. Such proposal is fully described in the enclosed proxy
statement and prospectus. I encourage you to review the proxy statement and
prospectus for all the details regarding the meeting agenda.

     Your Board of Trustees believes the matters proposed in the agenda are in
the best interests of the Fund and its shareholders and unanimously recommends a
vote "for" each proposal. Regardless of the number of shares you own, it is
important that they be represented and voted. Accordingly, please sign, date and
mail the enclosed proxy card in the postage paid return envelope. If you have
any questions regarding the meeting agenda or need assistance in voting, please
contact our proxy solicitor, D.F. King & Co., Inc., at 1-800-207-3156.

     Your prompt response will help save the Fund the expense of additional
solicitation.
    

                                         Sincerely,

                                        /S/ RONALD P. LYNCH

                                         Ronald P. Lynch
                                         Chairman of the Board


   
April 24, 1996
    
<PAGE>
 
                         LORD ABBETT SECURITIES TRUST -
                    LORD ABBETT FLORIDA TAX-FREE INCOME TRUST
                                767 Fifth Avenue
                            New York, New York 10153




   
Notice to shareholders of Lord Abbett Florida Tax-Free Income     April 24, 1996
Trust (the "Acquired Fund") of a Special Meeting of shareholders
of Lord Abbett Securities Trust to be held on June 19, 1996


Notice is given hereby to the shareholders of the Acquired Fund of a special
meeting of the shareholders of Lord Abbett Securities Trust. The meeting will be
held in the offices of Lord, Abbett & Co., on the 11th floor of The General
Motors Building, 767 Fifth Avenue, New York, New York on June 19, 1996, at 11:00
a.m. for the following purposes and to transact such other business as may
properly come before the meeting and any adjournments thereof.

ITEM 1.   To consider and act upon an Agreement and Plan of Reorganization
          between the Acquired Fund, a series of Lord Abbett Securities Trust,
          and the Florida Series, a series of Lord Abbett Tax-Free Income Trust
          (the "Acquiring Fund"), providing for (a) the transfer of all of the
          assets of the Acquired Fund to the Acquiring Fund in exchange for
          shares of a new class of the Acquiring Fund (to be designated "Class C
          Shares") and the assumption by the Acquiring Fund of all of the
          liabilities of the Acquired Fund, (b) the distribution of such Class C
          Shares to the shareholders of the Acquired Fund and (c) the subsequent
          termination of the Acquired Fund. (The investment policies and
          restrictions of the Acquiring Fund are expected to differ from those
          of the Acquired Fund in ways that are intended to provide greater
          flexibility in the management of the portfolio of the Acquiring Fund
          and to provide greater uniformity in the investment policies and
          restrictions among the various Lord Abbett-sponsored funds.) A vote in
          favor of this Item 1 will be deemed to be a vote to authorize the
          Acquired Fund, as the sole shareholder of Class C Shares prior to this
          reorganization, to approve a proposed distribution plan pursuant to
          Section 12 of the Investment Company Act of 1940, as amended, and Rule
          12b-1 thereunder applicable to that class.

ITEM 2.   To ratify the selection of Deloitte & Touche LLP as the independent
          public accountants of the Lord Abbett Securities Trust for the current
          fiscal year.
    


                                             By order of the Board of Trustees


                                             Kenneth B. Cutler
                                             Vice President and Secretary
<PAGE>
 
   
The Board of Trustees has fixed the close of business on March 22, 1996 as the
record date for determination of shareholders of the Acquired Fund entitled to
notice of and to vote at the meeting. Shareholders are entitled to one vote for
each share held. As of March 22, there were 2,219,350 shares of the Acquired
Fund and 138,028,692 shares of Lord Abbett Securities Trust issued and
outstanding.
    


- --------------------------------------------------------------------------------
PLEASE INDICATE YOUR VOTING INSTRUCTIONS ON THE ENCLOSED PROXY CARD.

SIGN, DATE AND RETURN IT IN THE ENVELOPE PROVIDED.

TO SAVE THE COST OF ADDITIONAL SOLICITATIONS, PLEASE MAIL YOUR PROXY
PROMPTLY.

- --------------------------------------------------------------------------------
<PAGE>
 
   
               PROXY STATEMENT AND PROSPECTUS DATED APRIL 24, 1996
    

                          Acquisition of the Assets of
             Lord Abbett Florida Tax-Free Income Trust, a series of
                          Lord Abbett Securities Trust
                  The General Motors Building, 767 Fifth Avenue
                               New York, NY 10153

       

                    by and in exchange for Class C Shares of
                           Florida Series, a series of
                        Lord Abbett Tax-Free Income Trust
                  The General Motors Building, 767 Fifth Avenue
                               New York, NY 10153
        

   
     This Proxy Statement and Prospectus relates to Class C shares (the "Class C
shares") of the Florida Series (the "Acquiring Fund"), a series of Lord Abbett
Tax-Free Income Trust (the "Income Trust"), to be issued to, and in exchange for
all the assets of, Lord Abbett Florida Tax-Free Income Trust (the "Acquired
Fund" and, together with the Acquiring Fund, the "Funds"), a series of Lord
Abbett Securities Trust (the "Securities Trust"). The telephone number of the
principal executive office of each of the Funds is 1-800-426-1130. In exchange
for such assets, the Acquiring Fund will also assume all of the liabilities of
the Acquired Fund. Following receipt of the Acquiring Fund Class C shares, the
Acquired Fund will be terminated and the Class C shares will be distributed to
the shareholders of the Acquired Fund. The shareholders of the Acquired Fund are
being asked to vote to approve or disapprove these proposed transactions (the
"Reorganization"), which are more fully described in this Proxy Statement and
Prospectus.

     The Income Trust and the Securities Trust are open-end diversified
investment management companies. The Acquired Fund seeks as high a level of
interest income exempt from federal income tax as is consistent with
preservation of capital. The Acquiring Fund currently has the same investment
objective but is seeking shareholder approval of the following amended
objective: to seek as high a level of interest income exempt from federal income
tax as is consistent with reasonable risk. Lord, Abbett & Co. ("Lord Abbett")
serves as investment manager to both Funds.


Any shareholder having a question regarding the meeting agenda or needing
assistance in voting, should contact the Acquired Fund's proxy solicitor, D.F.
King & Co., Inc., at 1-800-207-3156.

  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
       EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
           SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
             COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
                 PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
                             IS A CRIMINAL OFFENSE.
    
<PAGE>
 
     The Class C shares of the Acquiring Fund will be a newly-created class of
shares that will share pro-rata with the existing class of Acquiring Fund shares
(the "Class A shares") in the portfolio, income and expenses of the Acquiring
Fund, except that each class will bear the expense of its own distribution and
shareholder servicing arrangements and certain other expenses. See "Information
About the Reorganization -- Shares of the Acquiring Fund." The distribution and
shareholder servicing arrangements for the Class C shares will be substantially
the same as the arrangements currently applicable to the Acquired Fund shares.
The trustees of the Securities Trust believe that the proposed transaction will
enable the shareholders of the Acquired Fund to benefit from economies of scale
while continuing to invest in a portfolio of securities managed by Lord Abbett
under an investment objective substantially similar to that of the Acquired
Fund. See "Information About the Reorganization -- Reasons for the
Reorganization."

   
     This Proxy Statement and Prospectus sets forth concisely the information
about the Acquiring Fund that a shareholder of the Acquired Fund should know
before voting on the Reorganization. It should be read and retained for future
reference. Attached as Exhibit A to this Proxy Statement and Prospectus is a
copy of the Agreement and Plan of Reorganization (the "Plan") for the
Reorganization. This Proxy Statement and Prospectus is accompanied by the
Prospectus of the Acquiring Fund dated March 1, 1996 (the "Acquiring Fund
Prospectus"), which Prospectus is incorporated by reference herein. Also
incorporated herein by reference are (a) the Statement of Additional Information
dated the date hereof relating to this Proxy Statement and Prospectus, including
the Statement of Additional Information of the Securities Trust dated March 1,
1996 and the Statement of Additional Information of the Acquiring Fund dated
March 1, 1996, and (b) the Prospectus of the Securities Trust dated March 1,
1996 (the "Acquired Fund Prospectus"). Such Statements of Additional Information
and the Acquired Fund Prospectus are available, upon oral or written request,
and at no charge, from the Acquiring Fund, at its above-noted address or by
calling 1-800-874-3733.
    
<PAGE>
 
================================================================================
                                TABLE OF CONTENTS

   
SPECIAL MEETING OF SHAREHOLDERS OF THE SECURITIES TRUST...................  2

FEE TABLE.................................................................  3
    
 
ITEM 1. - APPROVAL OF THE AGREEMENT AND PLAN OF REORGANIZATION............  5

      SUMMARY OF PROPOSAL.................................................  5

      INFORMATION ABOUT THE REORGANIZATION................................  7

      COMPARATIVE INFORMATION ABOUT THE
            ACQUIRING FUND AND THE ACQUIRED FUND.........................  11

   
      REQUIRED VOTE......................................................  14
    

ITEM 2. - RATIFICATION OR REJECTION
      OF INDEPENDENT PUBLIC ACCOUNTANTS..................................  14

   
ADDITIONAL INFORMATION...................................................  15
    

Exhibit A - Agreement and Plan of Reorganization

   
Exhibit B - Comparison of Certain Investment Policies and Restrictions
    
<PAGE>
 
   
             SPECIAL MEETING OF SHAREHOLDERS OF THE SECURITIES TRUST


     This Prospectus and Proxy Statement is furnished in connection with the
solicitation of proxies by and on behalf of the Board of Trustees of the
Securities Trust to be used at a Special Meeting of Shareholders of the
Securities Trust to be held at 11:00 a.m. on June 19, 1996, at the offices of
Lord Abbett on the 11th floor of the General Motors Building, 767 Fifth Avenue,
New York, New York 10153, and at any adjournments thereof. This Prospectus and
Proxy Statement and the enclosed proxy card are first being mailed to
shareholders of the Acquired Fund on or about April 24, 1996.

     At the close of business on March 22, 1996 (the "Record Date"), there were
issued and outstanding 2,219,350 shares of the Acquired Fund and 138,028,692
shares of the Securities Trust. Only shareholders of record as of the close of
business on the Record Date will be entitled to notice of, and to vote at, the
meeting or any adjournment thereof. Shareholders of the Securities Trust are
entitled to one vote for each share. Under Delaware law, shares owned by two or
more persons (whether as joint tenants, co-fiduciaries or otherwise) will be
voted as follows, unless a written instrument or court order providing to the
contrary has been filed with the Secretary of the Securities Trust: (1) if only
one votes, that vote binds all; (2) if more than one votes, the vote of the
majority binds all; and (3) if more than one votes and the vote is evenly
divided, the vote will be cast proportionately.

     If the enclosed form of proxy is properly executed and returned in time to
be voted at the meeting, the proxies named therein will vote the shares
represented by the proxy in accordance with the instructions marked thereon. A
proxy may be revoked by the signer at any time at or before the meeting by
written notice to the Securities Trust, by execution of a later-dated proxy or
by voting in person at the meeting. Unless revoked, all valid proxies will be
voted in accordance with the specifications thereon or, in the absence of such
specifications, FOR approval of the Plan and the Reorganization, FOR
ratification of the selection of Deloitte & Touche as the Securities Trust's
independent public accountants and on any other matters as deemed appropriate.

     Proxies will be solicited by mail. Additional solicitations may be made by
telephone, facsimile or personal contact by officers or employees of Lord Abbett
and its affiliates. The Securities Trust may also request brokerage houses,
custodians, nominees, and fiduciaries who are shareholders of record to forward
proxy material to the beneficial owners. D.F. King & Co. has been retained to
assist in the solicitation of proxies at an estimated cost of $500. The cost of
the solicitation will be borne by the Acquired Fund.
    

     In the event that sufficient votes to approve the Plan are not received by
the meeting date, the persons named as proxies may propose one or more
adjournments of the meeting to permit further solicitation of proxies. In
determining whether to adjourn the meeting, the following factors may be
considered: the percentage of votes actually cast, the percentage of negative
votes actually cast and the nature of any further solicitation and any
information to be provided to shareholders with respect to such a solicitation.
Any such adjournment will require an affirmative vote of a majority of the



                                       2
<PAGE>
 
shares present in person or by proxy and entitled to vote at the meeting. The
persons named as proxies will vote upon such adjournment after consideration of
the best interests of all shareholders.

   
                                    FEE TABLE

     Set forth on the following page is a summary of the expenses of the shares
of the Acquiring Fund (currently, the only class of Acquiring Fund shares, to be
designated "Class A"). Also set forth on the following page is a summary
comparison of the expenses of (a) the shares of the Acquired Fund and (b) on a
pro-forma basis after giving effect to the Reorganization, the Class C shares of
the Acquiring Fund (to be issued in the Reorganization in exchange for the
shares of the Acquired Fund). The annual operating expenses shown in the summary
comparison for the Acquiring Fund shares and the Acquired Fund shares are the
actual expenses for the fiscal years ended October 31, 1995, and those shown on
a pro-forma basis for the Class C shares of the Acquiring Fund are the estimated
expenses of such shares for such year had the Reorganization occurred on
November 1, 1994, adjusted for estimated changes in the management fee. The
example set forth below is not a representation of past or future expenses.
Actual expenses may be greater or less than those shown.
    



                                       3
<PAGE>
 
<TABLE>    
<CAPTION>

- -------------------------------------------------------------------------------------------------------------------
                                               Acquiring Fund shares                                 Acquiring Fund
Shareholder Transaction Expenses                 (to be designated                                  Class C shares
(as a percentage of offering price)                   Class A)           Acquired Fund shares         (pro-forma)
- -------------------------------------------------------------------------------------------------------------------
<S>                                                   <C>                      <C>                      <C>
   Maximum Sales Load on Purchases(1).......          4.75%(2)                 None(3)                  None(3)

   Deferred Sales Load (1)..................           None(2)                 1.00%(4)                 1.00%(4)

Annual Operating Expenses
(as a percentage of average net assets)

      Management Fee........................          0.36%(5)                 0.00%(5)                 0.50%(5)

      Rule 12b-1 Fees.......................          0.26%(2)                 0.91%(3)                 0.91%(3)

      Other Expenses........................           0.12%                   0.03%(5)                 0.12%

Total Operating Expenses....................          0.74%(5)                 0.94%(5)                 1.53%(5)

</TABLE>     

Example: Assume each Fund's annual return is 5% and there is no change in the
level of expenses described above. For every $1,000 invested, with reinvestment
of all distributions, you would pay the following total expenses if you closed
your account after the number of years indicated.

<TABLE>    
<CAPTION>
                                                       1 Year         3 Years          5 Years       10 Years
                                                       ------         -------          -------       --------
<S>                                                     <C>             <C>              <C>           <C> 
     Acquiring Fund Class A shares (6)                  $55             $70              $87           $135
     Acquired Fund shares (6)                           $10             $30              $52           $115
     Acquiring Fund Class C shares                      $16             $48              $83           $183
        (pro-forma)(6)
</TABLE>     

(1)  Sales "load" is referred to as sales "charge" and "deferred sales load" is
     referred to as "contingent deferred reimbursement charge" throughout this
     Proxy Statement and Prospectus.
   
(2)  See "Purchases" in the Acquiring Fund Prospectus accompanying this Proxy
     Statement and Prospectus for descriptions of the front-end sales charges
     and the 1% contingent deferred reimbursement charges payable on sales and
     certain redemptions of these shares and the Rule 12b-1 plan applicable to
     the shares of the Acquiring Fund.
(3)  Although the Acquired Fund does not, and the Acquiring Fund will not with
     respect to the Class C shares, charge a front-end sales charge, investors
     should be aware that long-term shareholders may pay, under the Rule 12b-1
     plan of the Acquired Fund and under the Rule 12b-1 plan to be applicable to
     the Class C shares of the Acquiring Fund (which pays and will pay annual
     0.25% service and 0.75% distribution fees), more than the economic
     equivalent of the maximum front-end sales charge as permitted by certain
     rules of the National Association of Securities Dealers, Inc.
(4)  Redemptions of the Acquired Fund shares are, and redemptions of the Class C
     shares will be, subject to a 1% contingent deferred reimbursement charge if
     the redemption occurs before the first anniversary of the share purchase.
     Holding periods for shares purchased prior to the Reorganization will carry
     over for the purpose of determining the applicability of the CDRC to Class
     C shares.
(5)  Lord Abbett waived a portion of its management fee with respect to the
     Acquiring Fund and waived its management fee and subsidized certain
     expenses with respect to the Acquired Fund during the past year. The
     management fee and total operating expenses of the Acquiring Fund would
     have been 0.50% and 0.88%, respectively, and the management fee, other
     expenses (including the Rule 12b-1 Fees) and total operating expenses of
     the Acquired Fund would have been 0.50%, 1.28% and 1.78%, respectively,
     absent such waivers and subsidy. Lord Abbett has advised the Acquiring Fund
     that it intends to discontinue such waiver for the Acquiring Fund following
     the consummation of the Reorganization.
(6)  Based on total actual operating expenses and pro-forma operating expenses
     shown in the table above.
    

The foregoing is provided to assist shareholders of the Acquired Fund in
understanding the various expenses the holders of the shares of the Acquiring
Fund and the holders of the shares of the Acquired Fund have incurred and that
holders of the shares of the Acquired Fund might incur as holders of the Class C
shares following the Reorganization.

- --------------------------------------------------------------------------------


                                       4
<PAGE>
 
   
         ITEM 1. - APPROVAL OF THE AGREEMENT AND PLAN OF REORGANIZATION
    

                               SUMMARY OF PROPOSAL

     The following is a summary of certain information contained elsewhere or
incorporated by reference in this Proxy Statement and Prospectus and is
qualified in its entirety by reference to such information.

   
OVERVIEW OF PROPOSED REORGANIZATION. The Plan provides for the transfer to the
Acquiring Fund of all of the assets of the Acquired Fund in exchange for Class C
shares and the assumption by the Acquiring Fund of all of the liabilities of the
Acquired Fund. The Class C shares will then be distributed to the Acquired Fund
shareholders and the Acquired Fund will be terminated. As a result of the Reor
ganization, each shareholder of the Acquired Fund will become the owner of that
number of full and fractional Class C shares having an aggregate net asset value
equal to the aggregate net asset value of his or her shares of the Acquired
Fund, as of the close of business on the date the Acquired Fund assets are
transferred to the Acquiring Fund. Consummation of the Reorganization is subject
to the approval of the Acquired Fund's shareholders and other conditions,
including Income Trust shareholder approval of an amendment to the Income
Trust's Declaration and Agreement of Trust authorizing the creation of the Class
C shares.
    

     To avoid a need to call an Acquiring Fund shareholders' meeting after the
Reorganization, shareholders of the Acquired Fund are being asked to authorize
the Acquired Fund, as the sole Class C shareholder of the Acquiring Fund before
the Reorganization, to approve the proposed distribution plan for the Class C
shares. A vote in favor of the Reorganization will be deemed also to be a vote
to authorize the Acquired Fund to take such action.

   
     The trustees of the Securities Trust believe that the proposed
Reorganization will enable the shareholders of the Acquired Fund to benefit on a
long-term basis from economies of scale while continuing to invest in a
portfolio of securities managed by Lord Abbett under a similar investment
objective to that of the Acquired Fund. See "Information About the
Reorganization -- Reasons for Reorganization" for additional information about
the reasons for the Reorganization.
    

BUSINESSES OF THE ACQUIRED AND ACQUIRING FUNDS. The Acquired Fund is a
diversified series of the Securities Trust, an open-end management investment
company organized as a Delaware business trust under an Agreement and
Declaration of Trust dated February 26, 1993. The Securities Trust offers ten
series, one of which is the Acquired Fund, each consisting of one class of
shares. The Acquired Fund commenced investment operations on October 31, 1993.
As of December 31, 1995, the Acquired Fund's net assets were approximately $10
million.

   
     The Acquiring Fund is a non-diversified series of the Income Trust, an
open-end management investment company organized under Massachusetts law on
September 11, 1991. To date, the Income Trust offers four series, one of which
is the Acquiring Fund, each consisting of one class of shares. As of December
31, 1995, the Acquiring Fund's net assets were approximately $176 million.
    



                                       5
<PAGE>
 
   
INVESTMENT OBJECTIVES AND POLICIES OF THE ACQUIRED FUND AND THE ACQUIRING FUND.
The Acquired Fund and Acquiring Fund have identical investment objectives: to
seek as high a level of interest income exempt from federal income tax as is
consistent with preservation of capital. The Acquiring Fund is seeking
shareholder approval of the following amended objective: to seek as high a level
of interest income exempt from federal income tax as is consistent with
reasonable risk. For this purpose, "reasonable risk" means that the Acquiring
Fund over time will have a volatility approximating the Lehman Brothers Current
Coupon Long Index. The two Funds also have generally similar investment policies
and restrictions. The Acquiring Fund is seeking to revise and reclassify certain
of its investment policies and restrictions in order to provide greater
flexibility in managing the investment portfolio of the Acquiring Fund and to
provide greater uniformity in the investment policies and restrictions among the
various Lord Abbett-sponsored funds. Most importantly, a number of the
investment policies and restrictions that are classified as fundamental for the
Acquired Fund are to be re-classified as non- fundamental for the Acquiring
Fund. See "Comparative Information About the Acquiring Fund and the Acquired
Fund -- Investment Objectives, Policies and Restrictions."
    

     The portfolio of the Acquired Fund is expected to be suitable for the
Acquiring Fund, and so no significant realignment of that portfolio is expected
in connection with the Reorganization.

PURCHASES AND EXCHANGES. Shares of the Acquired Fund are, and Class C shares
will be, available through certain authorized dealers at the public offering
price, which is the net asset value per share. See "Information About the
Reorganization -- Shares of the Acquiring Fund." Shareholders of the Acquired
Fund may now exchange their shares for shares of the other nine series of the
Securities Trust and for the shares of Lord Abbett U.S. Government Securities
Money Market Fund, Inc. It is expected that holders of Class C shares will be
able to exchange their shares for Class C shares of up to 13 other funds and
series managed by Lord Abbett. Each exchange represents a sale of shares for
which a shareholder may have to recognize a gain or loss under Federal income
tax provisions.

   
RULE 12b-1 PLAN. The Acquired Fund has adopted a plan pursuant to Section 12(b)
of the Investment Company Act of 1940 (the "1940 Act") and Rule 12b-1 thereunder
(a "Rule 12b-1 Plan"), under which it pays service and distribution fees at the
time shares are sold not to exceed 1% of the net asset value of such shares and
at each quarter-end after the first anniversary of the sale of shares at an
annual rate not to exceed 1% of the net asset value of such shares then
outstanding. As part of the Reorganization, the Acquiring Fund will adopt a Rule
12b-1 Plan applicable to the Class C shares that will be substantially the same
as the Acquired Fund's Rule 12b-1 Plan except as noted below under "Information
About the Reorganization -- Rule 12b-1 Plan."

DIVIDEND POLICIES AND OPTIONS. The Acquired Fund distributes net investment
income monthly as a dividend. It also may pay supplemental dividends and capital
gains distributions in December or January. The Acquiring Fund has a similar
dividend and distribution policy, except that capital gains may be distributed
in November. The shareholders of each Fund may reinvest such dividends and
distributions in additional shares at net asset value or take such amounts in
cash.
    

REDEMPTION PROCEDURES. The redemption procedures of the Acquired Fund and the
Acquiring Fund are substantially the same. See the Acquiring Fund Prospectus
under "Redemptions."



                                       6
<PAGE>
 
TAX CONSIDERATIONS. The consummation of the Reorganization is subject to receipt
of an opinion of counsel, substantially to the effect that, among other things,
the Reorganization will not cause a gain or loss to be recognized by the
Acquired Fund or its shareholders for federal income tax purposes. See
"Information about the Reorganization--Federal Income Tax Considerations."

   
RISK FACTORS. Because the investment objectives of the Acquired Fund is similar
to the investment objective of the Acquiring Fund as proposed to be amended,
Lord Abbett believes that the relative risks involved in investing in the Funds
can be considered similar. However, the investment policies and restrictions of
the Acquiring Fund are proposed to be made less restrictive compared to those of
the Acquired Fund in order to provide greater flexibility in the future
management of the investment portfolio of the Acquiring Fund and to provide
greater uniformity in the investment policies and restrictions among the various
Lord Abbett-sponsored funds. If the Acquiring Fund were to take to any
significant extent the actions permitted by these less restrictive policies and
restrictions, a result not now anticipated, the risks of investing in the
Acquiring Fund could be greater than those involved in investing in the Acquired
Fund. See "Comparative Information About the Acquiring Fund and the Acquired
Fund -- Investment Objectives, Policies and Restrictions."
    


                      INFORMATION ABOUT THE REORGANIZATION


   
THE PLAN. On July 12, 1996, assuming the conditions referred to below are
satisfied, the Acquired Fund will transfer all its assets to the Acquiring Fund
(the date of such transfer is referred to herein as the "Closing Date") in
exchange for (i) Class C shares of the Acquiring Fund having an aggregate net
asset value equal to the aggregate value of the assets, less liabilities, of the
Acquired Fund and (ii) the assumption by the Acquiring Fund of all the
liabilities of the Acquired Fund. The Acquired Fund will distribute as of the
Closing Date such Class C shares pro-rata to its shareholders of record,
determined as of the close of business on the Closing Date, in redemption and
cancellation of their shares of the Acquired Fund. The net asset value of Class
C shares and the value of the Acquired Fund's assets and the amount of its
liabilities will be determined as of the Closing Date in accordance with the
valuation procedures set forth in the Income Trust's Declaration and Agreement
of Trust (see "Purchases" in the Acquiring Fund Prospectus). The valuation
procedures used by the Acquiring Fund are the same as those used by the Acquired
Fund.

     The obligations of the Acquiring Fund and the Acquired Fund to consummate
the Reor ganization are subject to the satisfaction of certain conditions
precedent, including (a) approval and authorization of the Reorganization by the
vote of a majority of the shares of the Acquired Fund voted on the matter if a
quorum is present, (b) receipt of a favorable ruling from the Internal Revenue
Service to the effect that the issuance of various classes of shares by the
Acquiring Fund will not result in dividends or distributions of the Acquiring
Fund constituting "preferential dividends" under the Internal Revenue Code of
1986, as amended (the "Code"), (c) receipt of a favorable opinion of legal
counsel as to the federal income tax consequences of the proposed transaction as
described below under "Federal Income Tax Considerations", and (d) approval by
the shareholders of the Income Trust of an amendment to its Declaration and
Agreement of Trust authorizing the creation of additional classes of shares.
    



                                       7
<PAGE>
 
     The foregoing summary of the Plan does not purport to be complete, and is
subject in all respects to the provisions of, and is qualified in its entirety
by reference to, the Plan, a copy of which is attached as Exhibit A.

   
REASONS FOR THE REORGANIZATION. The Board of Trustees of the Securities Trust
and the Board of Trustees of the Income Trust, including in each case a majority
who are not "interested persons" (as defined in the 1940 Act) of either the
Securities Trust, the Income Trust or Lord Abbett, approved the Plan and the
Reorganization on March 14, 1996, and in this connection determined that
participation in the proposed Reorganization is in the best interests of the
shareholders of each of the Funds and that the interests of existing
shareholders of the Funds will not be diluted as a result of the Reorganization.
In doing so, both boards considered the estimated expenses to be incurred by the
Funds in connection with the Reorganization and several other factors, including
(a) that the shareholders of the Acquired Fund are expected to benefit from
economies of scale as shareholders of the larger Acquiring Fund, while
continuing to invest in a portfolio of securities managed by Lord Abbett under a
substantially similar investment objective, and (b) that the implementation of a
multi-class fund structure for the Acquiring Fund is expected to (i) enable
investors in the Acquiring Fund to choose the distribution option that best
suits their individual situations, (ii) facilitate distribution of the Acquiring
Fund's shares, and (iii) maintain the competitive position of the Acquiring Fund
in relation to other funds that have imple mented or are seeking to implement
similar distribution arrangements.
    

     The trustees of the Securities Trust and the trustees of the Income Trust
are the same individuals, except that E. Wayne Nordberg is a director of the
Income Trust but not a trustee of the Securities Trust.

SHARES OF THE ACQUIRING FUND. On or before the Closing Date, the Acquiring Fund
will have two classes of shares, Class A shares (the existing class of the
Acquiring Fund) and Class C shares (to be received by the shareholders of the
Acquired Fund in the Reorganization). Each share of the Acquiring Fund,
regardless of class, will share pro-rata (based on net asset value) in the
portfolio and income of the Acquiring Fund and in the Acquiring Fund's expenses,
except for differences in expenses resulting from different Rule 12b-1 Plans for
the classes and certain other class specific expenses. See "Rule 12b-1 Plans"
below. After the Reorganization, Class C shares will be offered at net asset
value without an initial sales charge but if redeemed for cash before the first
anniversary of purchase, will be subject to a contingent deferred reimbursement
charge (a "CDRC") equal to 1% of the lower of their cost or then net asset
value. Holding periods for shares purchased prior to the Reorganization will
carry over for the purpose of determining the applicability of the CDRC.

     After the Closing Date, the Acquiring Fund may create and issue one or more
classes of shares in addition to the Class A and C shares.
       

     Shares of all classes of the Acquiring Fund will vote together on all
matters affecting the Acquiring Fund, except for matters, such as approval of a
Rule 12b-1 Plan, affecting only a particular class or classes. All shares voting
on a matter will have identical voting rights. All issued shares of the
Acquiring Fund are fully paid and non-assessable, and shareholders have no
preemptive or other right to subscribe to any additional shares. All shares
within a series will have the same rights and be subject to the same limitations
with respect to dividends, redemptions and liquidation except for differences



                                       8
<PAGE>
 
resulting from class-specific Rule 12b-1 plans and related service plans and
certain other class-specific expenses.

   
RULE 12b-1 PLANS. The Acquiring Fund is adopting a Rule 12b-1 Plan for the Class
C shares (the "Class C 12b-1 Plan") substantially the same as the plan currently
in effect for the Acquired Fund, except for the changes noted below. The
Acquired Fund's plan provides for payments to dealers through Lord Abbett of
distribution and service fees (a) at the time shares are sold, not to exceed
0.75% and 0.25%, respectively, of the net asset value of the shares sold and (b)
at the end of the quarter following the first anniversary of the sale of shares,
and quarterly thereafter, at an annual rate not to exceed 0.75% and 0.25%,
respectively, of the net asset value of such shares, including any shares issued
for reinvested dividends and distributions after such first anniversary, so long
as such shares remain outstanding. Lord Abbett may retain from the quarterly
distribution fee, for the payment of distribution expenses incurred directly by
it, an amount not to exceed 0.10% of the average annual net asset value of such
shares outstanding. See the Acquired Fund Prospectus under "Purchases" for
additional information concerning the Rule 12b-1 Plan of the Acquired Fund.

     There are two substantive changes in the Class C 12b-1 Plan: First,
payments under the plan may be made to all institutions and persons permitted by
applicable law and/or rules to receive such payments ("Authorized
Institutions"), rather than just to dealers, as is the case under the Acquired
Fund's plan; and Second, the other party to the Class C 12b-1 Plan is to be Lord
Abbett Distributor, LLC, a New York limited liability company, to be formed as a
subsidiary of Lord Abbett ("Lord Abbett Dis tributor"), rather than Lord Abbett
itself. Lord Abbett Distributor will take on all the underwriting functions
currently performed directly by Lord Abbett.
    

     The Acquiring Fund will pay smaller Rule 12b-1 distribution and service
fees in connection with the Class A shares. However, the Acquiring Fund will
sell those shares subject to an initial sales charge (see the Acquiring Fund
Prospectus under "Purchases"). The Acquired Fund does not impose, and the
Acquiring Fund will not impose with respect to the Class C shares, an initial
sales charge.

     The Class C 12b-1 Plan was approved on March 14, 1996, by the trustees of
the Income Trust, including a majority of the trustees who are not "interested
persons" of the Income Trust or the Acquiring Fund within the meaning of the
1940 Act and who will have no direct or indirect financial interest in the
operations of such plan or in any agreements related thereto. Prior to the
Reorganization, the Acquired Fund will purchase one Class C share, and as sole
shareholder, will approve the Class C 12b-1 Plan prior to that class being
issued to the Acquired Fund in the Reorganization. A vote in favor of the
Reorganization will be deemed also to be a vote to authorize the Acquired Fund
to take such action.

FEDERAL INCOME TAX CONSIDERATIONS. The consummation of the Reorganization is
conditioned upon the receipt of an opinion of Debevoise & Plimpton, legal
counsel to the Acquiring Fund and the Acquired Fund, substantially to the effect
that, for Federal income tax purposes:

          (a) no gain or loss will be recognized by the Acquired Fund upon the
     transfer of the Acquired Fund's assets to the Acquiring Fund in exchange
     for Class C shares and the assumption by the Acquiring Fund of the
     liabilities of the Acquired Fund or upon the distribution of the Class C
     shares to the Acquired Fund's shareholders;



                                       9
<PAGE>
 
          (b) no gain or loss will be recognized by the Acquiring Fund upon the
     receipt of the assets of the Acquired Fund in exchange for Class C shares
     and the assumption by the Acquiring Fund of the liabilities of the Acquired
     Fund;

          (c) no gain or loss will be recognized by shareholders of the Acquired
     Fund upon the exchange of their Acquired Fund shares for Class C shares;

          (d) the aggregate tax basis of the Class C shares received by any
     Acquired Fund shareholder pursuant to the Reorganization will be the same
     as the aggregate tax basis of the Acquired Fund shares held by such
     shareholder immediately prior to the Reorganization, and the holding period
     for the Class C shares to be received by any Acquired Fund shareholder will
     include the period during which the Acquired Fund shares exchanged therefor
     were held by such shareholder (provided that the Acquired Fund shares were
     held as capital assets on the date of the Reorganization); and

          (e) the tax basis of the Acquired Fund's assets acquired by the
     Acquiring Fund will be the same as the tax basis of such assets to the
     Acquired Fund immediately prior to the Reorganization, and the holding
     period of the assets of the Acquired Fund in the hands of the Acquiring
     Fund will include the period during which those assets were held by the
     Acquired Fund.

     The Funds have not sought a tax ruling from the Internal Revenue Service
with respect to the tax consequences of the Reorganization, but will act in
reliance upon the opinion of counsel. Such opinion is not binding on the
Internal Revenue Service. Since the foregoing discussion relates only to the
general Federal income tax consequences of the Reorganization, shareholders
should also consult their tax advisors as to any state or local tax consequences
of the Reorganization to them and any special circumstances that may apply in
their individual circumstances.

   
EXPENSES OF THE REORGANIZATION. Expenses of the Reorganization, including legal
and accounting expense, the costs of proxy solicitation and the preparation of
this Prospectus and Proxy Statement, will be borne in part by the Acquiring Fund
and in part by the Acquired Fund. If the Reorganization is consummated, the
expenses of the Acquired Fund, to the extent not paid prior to the Closing Date,
will be assumed by the Acquiring Fund and taken into account in determining the
net assets of the Acquired Fund for the purpose of calculating the number of
Class C shares to be issued to the Acquired Fund.
    



                                       10
<PAGE>
 
CAPITALIZATION. The following table sets forth the capitalization of the
Acquiring Fund and the Acquired Fund as of December 31, 1995, and the pro-forma
capitalization of the Acquiring Fund as if the Reorganization had occurred on
that date:


<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------
                                                                         Class A        Class C
                                                                        Acquiring      Acquiring
                                                                          Fund           Fund
                                  Acquiring Fund     Acquired Fund     (pro-forma -   (pro-forma -
                                   (unaudited)        (unaudited)       unaudited)     unaudited)
- --------------------------------------------------------------------------------------------------
                                                (In thousands, except per share values)
- --------------------------------------------------------------------------------------------------
<S>                                  <C>                <C>             <C>             <C>    
Net Assets.....................      $176,705           $10,298         $176,705        $10,298
- --------------------------------------------------------------------------------------------------
Net Asset Value per Share......         $4.93            $ 4.68           $ 4.93         $ 4.93
- --------------------------------------------------------------------------------------------------
Shares Outstanding: ...........        35,807             2,199           35,807          2,087
- --------------------------------------------------------------------------------------------------
</TABLE>


     The foregoing table reflects a pro-forma exchange ratio of approximately
0.9 Class C shares for each Acquired Fund share. If the Reorganization is
consummated, the actual exchange ratio may vary from this ratio due to changes
in the market value of the portfolio securities of both the Acquiring Fund and
the Acquired Fund between December 31, 1995 and the Closing Date, and changes in
the amounts of undistributed net investment income and accrued liabilities of
the Acquiring Fund and the Acquired Fund during that period.


                        COMPARATIVE INFORMATION ABOUT THE
                      ACQUIRING FUND AND THE ACQUIRED FUND

   
FEES AND EXPENSES. Both the Acquiring Fund and the Acquired Fund employ Lord
Abbett as their investment manager. Under the management agreement between the
Income Trust and Lord Abbett, the Income Trust, on behalf of the Acquiring Fund,
is obligated to pay a monthly fee, based on average daily net assets for each
month, at the annual rate of 0.50 of 1%. For the fiscal year ended September 30,
1995, Lord Abbett waived a portion of its management fee and the Acquiring Fund
paid Lord Abbett a management fee at an annual rate of 0.36 of 1% of average
daily net assets. This management agreement will continue in effect following
the Reorganization. Lord Abbett has advised the Acquiring Fund that it does not
intend to waive any portion of the management fee following the Reorganization.

     Under the management agreement between the Securities Trust and Lord
Abbett, the Securities Trust, on behalf of the Acquired Fund, is obligated to
pay a monthly fee at the annual rate of 0.50 of 1% of average daily net assets.
For the fiscal year ended October 31, 1995, Lord Abbett waived all of the
management fee payable by the Acquired Fund.

     The management agreement of the Acquired Fund provides for the Acquired
Fund to repay Lord Abbett without interest for any expenses of the Acquired Fund
paid or reimbursed by Lord Abbett,
    



                                       11
<PAGE>
 
   
as follows: if the Acquired Fund's annual expense ratio (determined before
taking into account any fee waiver or expense payment or reimbursement by Lord
Abbett) is less than 1.95% after the first day of the calendar quarter after the
net assets of the Acquired Fund first reach $50 million (the "commencement
date"), the Acquired Fund will repay Lord Abbett an amount sufficient to
increase the expense ratio to 1.95%. The Acquired Fund is not obligated to repay
any such expenses after the earlier of the termination of the management
agreement or the end of five full fiscal years after the commencement date. The
contingent obligation to repay such expenses, which totaled $95,539 as of
December 31, 1995, will be extinguished upon the consummation of the
Reorganization. The Acquiring Fund has no such contingent obligation.

     As shown above under "Fee Table," the adjusted pro-forma expense ratio for
the Class C shares was 1.53%, compared to the actual expense ratio for such year
of 0.94% for the Acquired Fund. If Lord Abbett had not waived its management fee
and subsidized certain expenses for the Acquired Fund, the Acquired Fund's
expense ratio for such year would have been 1.78%.

INVESTMENT OBJECTIVES, POLICIES AND RESTRICTIONS. The Acquired Fund and
Acquiring Fund have identical investment objectives: to seek as high a level of
interest income exempt from federal income tax as is consistent with
preservation of capital. The Acquiring Fund is seeking shareholder approval of
the following amended objective: to seek as high a level of interest income
exempt from federal income tax as is consistent with reasonable risk. For this
purpose, "reasonable risk" means that the Acquiring Fund over time will have a
volatility approximating the Lehman Brothers Current Coupon Long Index.

     The Acquired Fund and the Acquiring Fund have substantially the same
investment policies and restrictions. However, the Acquiring Fund is seeking
approval of its shareholders to simplify and make less restrictive its
investment policies and restrictions in order to provide greater flexibility in
managing its investment portfolio and to provide greater uniformity in the
investment policies and restrictions among the various Lord Abbett-sponsored
funds. A number of the investment policies and restrictions that are classified
as fundamental for the Acquired Fund are to be re-classified as non- fundamental
for the Acquiring Fund. In other instances, certain fundamental restrictions of
the Acquired Fund are to be modified or eliminated in the case of the Acquiring
Fund. Fundamental investment restrictions may not be changed without approval of
the shareholders of a fund and the costs of shareholder meetings for these
purposes generally are borne by the fund and its shareholders. The board may
amend a non-fundamental restriction as it deems appropriate and in the best
interest of the fund and its shareholders, without incurring the costs of
seeking a shareholder vote.

     The principal effect for the shareholders of the Acquired Fund of the
proposed changes in the fundamental policies of the Acquiring Fund will be to
permit the Acquiring Fund to take certain actions not now permitted to the
Acquired Fund without obtaining approval of the shareholders. The Acquiring Fund
either will not be permitted to, or does not intend to, take any such action
unless such action is approved by its Board of Trustees. The board does not now
intend to approve any such action or to do so in the future unless it deems such
action to be an appropriate means of seeking the Acquiring Fund's investment
objective in the best interests of the Acquiring Fund and its shareholders, in
which case disclosure of the change would be made in the Income Trust's then
current prospectus or statement of additional information or both. Such actions,
none of which the board has a present intention of
    



                                       12
<PAGE>
 
   
approving, involve the following matters, among others: (i) short sales of
securities and purchases of securities on margin to the extent permitted by
applicable law; (ii) borrowings from banks in amounts up to one-third of total
assets (and up to an additional 5% of total assets for temporary purposes) and
such short-term credits as may be necessary for the clearance of purchases and
sales of portfolio securities; (iii) loans of portfolio securities to the extent
permitted by law; (iv) purchases and sales of securities directly or indirectly
secured by real estate or interests therein and of commodities and commodity
contracts in accordance with applicable law so long as registration would not be
required as a commodity pool operator under the Commodity Exchange Act; (v)
pledges to secure borrowings or in connection with the Acquiring Fund's
investment policies and as permitted by applicable law; (vi) investments in the
securities of other investment companies to the extent permitted by applicable
law; and (vii) purchases and sales of puts, calls, straddles or spread options.

     A summary comparison of the fundamental and certain non-fundamental
investment policies and restrictions of the Acquired Fund and of the Acquiring
Fund, as currently in effect and as proposed to be amended, is set forth in
Exhibit B to this Proxy Statement and Prospectus.
    

     For a full discussion and statement of the Acquiring Fund's investment
objectives, policies and restrictions, see "Investment Objective" and "How We
Invest" in the Acquiring Fund Prospectus and "Investment Objective and Policies"
in the Acquiring Fund Statement of Additional Information. For a full discussion
and statement of the Acquired Fund investment objectives, policies and
restrictions, see "Investment Objective" and "How We Invest" in the Acquired
Fund Prospectus and "Investment Objective and Policies" in the Acquired Fund
Statement of Additional Information. The summary comparison set forth in Exhibit
B does not purport to be complete, and is subject in all respects to, and is
qualified in its entirety by reference to, such statements of such policies and
restrictions.

   
SHAREHOLDERS' RIGHTS. The Acquiring Fund believes that the rights of the
Acquired Fund shareholders will not change in an adverse way as a result of the
Reorganization. After the Reorganization, the rights of the former shareholders
of the Acquired Fund (Class C shareholders of the Acquiring Fund) will be
governed by the Income Trust's Declaration and Agreement of Trust, By-Laws and
applicable Massachusetts law rather than by the Securities Trust's Declaration
and Agreement of Trust, By-Laws and applicable Delaware law. The operations of
the Acquiring Fund will continue to be subject to the provisions of the 1940 Act
and the rules and regulations of the Commission thereunder.

     The responsibilities, powers and fiduciary duties of the trustees of the
Income Trust are substantially the same as those of the trustees of the
Securities Trust. The Declaration and Agreement of Trust of both the Income
Trust and the Securities Trust provide for indemnification of the trustees
against certain liabilities and expenses, except with respect to, among other
matters, (i) any matter as to which any trustee has been adjudicated to have not
acted in good faith in the reasonable belief that his or her action was in the
best interest of the Acquired Fund, or (ii) any liability by reason of willful
misfeasance, bad faith, gross negligence or reckless disregard of duties. Income
Trust and Securities Trust shareholders may remove a trustee by a vote of two
thirds of the outstanding shares.

     Neither the Acquired Fund nor the Acquiring Fund regularly holds
shareholder meetings. In each case, a meeting of shareholders will be held upon
the written request of holders of at least 25% of shares entitled to be voted at
the meeting.
    



                                       13
<PAGE>
 
   
     The foregoing is only a summary of certain rights of the shareholders of
the Acquired Fund and of the rights these shareholders will have following the
Reorganization as holders of Class C shares of the Acquiring Fund. It is not a
complete description of the Declaration and Agreement of Trust of the Securities
Trust or the Income Trust, the By-Laws of either of them or the applicable
Delaware or Massachusetts law. Shareholders desiring additional information
about those documents and provisions of law should refer to such Declarations
and Agreements of Trust, By-Laws and provisions.


                                  REQUIRED VOTE

     Approval of the Plan and the Reorganization will require the affirmative
vote of a majority of the shares of the Acquired Fund voted on the matter.

     If an Acquired Fund shareholder abstains from voting on this matter, then
the shares held by such shareholder shall be deemed present at the meeting for
purposes of determining a quorum, but shall not be deemed to have been voted in
favor of this matter. If a broker returns a "non-vote" proxy, indicating a lack
of authority to vote on this matter, then the shares covered by such non-vote
shall be deemed present at the meeting for purposes of determining a quorum, but
shall not be deemed to have been voted on this matter.

     If the Plan is not approved by the shareholders of the Acquired Fund, or if
the Reorganization is not consummated for any other reason, the Acquired Fund
will continue to engage in business as Lord Abbett Florida Tax-Free Income
Trust, a series of Lord Abbett Securities Trust.
    

     The Board of Trustees of the Securities Trust recommends that shareholders
vote FOR the approval of the proposed Agreement and Plan of Reorganization and
the Reorganization.


                     ITEM 2. - RATIFICATION OR REJECTION OF
                         INDEPENDENT PUBLIC ACCOUNTANTS

   
     The Board of Trustees of the Securities Trust has selected Deloitte &
Touche LLP as the in dependent public accountants for the Securities Trust for
the fiscal year ending October 31, 1996. The Act requires that such selection be
submitted for ratification or rejection at the next annual meeting of
shareholders if such meeting be held. Deloitte & Touche LLP (or a predecessor
firm) acted as the Securities Trust's independent public accountants for the
year ended October 31, 1995, and for a number of years prior thereto. Based on
information in the possession of the Securities Trust, and information furnished
by Deloitte & Touche LLP, the firm has no direct financial interest and no
material indirect financial interest in the Securities Trust. A representative
of Deloitte & Touche LLP is expected to attend the annual meeting and will be
provided with an opportunity to make a statement and answer appropriate
questions.

     Ratification of the selection of Deloitte & Touche LLP by the shareholders
of the Securities Trust requires the affirmative vote of a majority of the
shares of the Securities Trust voted on this matter.
    



                                       14
<PAGE>
 
   
If a shareholder abstains from voting on this matter, then the shares held by
such shareholder shall be deemed present at the meeting for purposes of
determining a quorum, but shall not be deemed to have been voted on this matter.
If a broker returns a "non-vote" proxy, indicating a lack of authority to vote
on this matter, then the shares covered by such non-vote shall be deemed present
at the meeting for purposes of determining a quorum, but shall not be deemed to
have been voted on this matter.
    

            The  Board of  Trustees  of the  Securities  Trust  recommends  that
shareholders  vote to ratify  the  selection  of  Deloitte  & Touche  LLP as the
Securities  Trust's  independent  public  accountants for the fiscal year ending
October 31, 1996.


                             ADDITIONAL INFORMATION

   
     To the knowledge of the Income Trust and the Securities Trust, as of March
22, 1996, no person owned of record or beneficially 5% or more of the
outstanding shares of the Income Trust, the Acquiring Fund, the Acquired Fund or
the Securities Trust. As of March 22, 1996, the trustees and officers of the
Income Trust, as a group, owned less than 1% of the outstanding shares of the
Income Trust.

     The Income Trust (of which the Acquiring Fund is a series) and the
Securities Trust (of which the Acquired Fund is a series) are subject to the
informational requirements of the Securities Exchange Act of 1934 and in
accordance therewith file reports, proxy statements and other information with
the Securities and Exchange Commission. Such reports, proxy statements and other
information filed by such entities can be inspected and copied at the public
reference facilities of the Commission at Room 1024, 450 Fifth Street, N.W.,
Washington, D.C., and at the Northeast Regional Office in New York, 7 World
Trade Center, 13th Floor, New York, New York. Copies of such material can also
be obtained by mail from the Public Reference Branch, Office of Consumer Affairs
and Information Services, Securities and Exchange Commission, Washington, D.C.
20549 at prescribed rates.
    



                                       15
<PAGE>
 
                                                                       EXHIBIT A
                                                                       ---------

                      AGREEMENT AND PLAN OF REORGANIZATION

   
     THIS AGREEMENT AND PLAN OF REORGANIZATION (the "Agreement") is made as of
this day  of , 1996, by and between Lord Abbett Tax-Free Income Trust (the
"Income Trust"), a Massachusetts business trust, on behalf of its series the
Florida Series (the "Acquiring Fund") and Lord Abbett Securities Trust (the
"Securities Trust"), a Delaware business trust, on behalf of its series Lord
Abbett Florida Tax-Free Income Trust (the "Acquired Fund").
    

     WHEREAS, this Agreement is intended to be and is adopted as a plan of
reorganization and liquidation within the meaning of Section 368(a)(1)(C) of the
United States Internal Revenue Code of 1986, as amended (the "Code");

     WHEREAS, the reorganization (the "Reorganization") will consist of the
transfer of all of the assets of the Acquired Fund in exchange for Class C
shares of capital stock of the Acquiring Fund (the "Acquiring Fund Class C
Shares" and each an "Acquiring Fund Class C Share") and the assumption by the
Acquiring Fund of all of the liabilities of the Acquired Fund and the
distribution, after the Closing Date herein referred to, of Acquiring Fund Class
C Shares to the shareholders of the Acquired Fund in termination of the Acquired
Fund, all upon the terms and conditions hereinafter set forth in this Agreement;

     WHEREAS, the Securities Trust and the Income Trust are open-end, registered
investment companies of the management type;

     WHEREAS, the Acquiring Fund is a series of the Income Trust;

     WHEREAS, the Acquired Fund is a series of the Securities Trust and the
Acquired Fund owns securities that generally are of the character in which the
Acquiring Fund is permitted to invest;

     WHEREAS, the Acquiring Fund is authorized to issue and currently has
outstanding a single class of shares (the "Acquiring Fund Class A Shares"), and
prior to the consummation of the Reorganization, will seek to amend its
Declaration and Agreement of Trust to provide for the authorization and issuance
of shares of additional classes of shares, including Acquiring Fund Class C
Shares, which will share pro rata with each other class in the portfolio, income
and expenses of the Acquiring Fund, except that each class will bear the expense
of its own distribution and shareholder servicing arrangements and certain other
expenses;
<PAGE>
 
     WHEREAS, after the multiple class share structure is authorized by the
Acquiring Fund but before the Acquiring Fund Class C Shares are issued to the
Acquired Fund pursuant to the Reorganization, the Acquired Fund is to purchase
one Acquiring Fund Class C share and as sole shareholder approve a plan pursuant
to Section 12(b) of the Investment Company Act of 1940 (the "1940 Act") and Rule
12b- 1 thereunder (a "Rule 12b-1 Plan") applicable to the Acquiring Fund Class C
Shares;

     WHEREAS, the Board of Trustees, including a majority of the trustees who
are not "interested persons" (as defined under the 1940 Act ), of the Securities
Trust has determined that the Reorganization is in the best interests of the
Acquired Fund's shareholders and that the interests of the existing shareholders
of the Acquired Fund will not be diluted as a result of this transaction; and

     WHEREAS, the Board of Trustees, including a majority of the trustees who
are not "interested persons" (as defined under the 1940 Act) of the Income
Trust, has determined that the Reorganization is in the best interests of the
Acquiring Fund's shareholders and that the interests of the existing
shareholders of the Acquiring Fund will not be diluted as a result of this
transaction;

     NOW THEREFORE, in consideration of the premises and of the agreements
hereinafter set forth, the parties hereto agree as follows:

1.   REORGANIZATION.

   
     1.1. Subject to the terms and conditions herein set forth and on the basis
of the representations and warranties contained herein, the Securities Trust
will transfer assets of the Acquired Fund as set forth in paragraph 1.2 to the
Acquiring Fund, and the Acquiring Fund will in exchange therefor, (i) deliver to
the Acquired Fund the number of Acquiring Fund Class C Shares, including
fractional Acquiring Fund Class C Shares, determined by dividing the net value
of the Acquired Fund's assets so transferred computed in the manner and as of
the time and date set forth in paragraph 2.1, by the net asset value of one
Acquiring Fund Class A Share, computed in the manner and as of the time and date
set forth in paragraph 2.2; and (ii) assume all of the liabilities of the
Acquired Fund. Such transactions shall take place at the closing provided for in
paragraph 3.1 (the "Closing").
    

     1.2. (a) The assets of the Acquired Fund to be acquired by the Acquiring
Fund shall consist of all of its property, including, without limitation, all
cash, securities and dividends or interest receivables and any deferred or
prepaid expenses shown as an asset on the books of the Acquired Fund on the
closing date provided in paragraph 3.1 (the "Closing Date").



                                        2
<PAGE>
 
     (b) The Acquiring Fund has a list of all of the Acquired Fund's assets as
of the date of execution of this Agreement. The Acquired Fund has a statement of
the Acquiring Fund's investment objectives, policies and restrictions. The
Acquired Fund reserves the right to sell any of its securities but will not,
without the prior approval of the Acquiring Fund, acquire any additional
securities other than securities of the type in which the Acquiring Fund is
permitted to invest. The Acquiring Fund will, within a reasonable time prior to
the Closing Date, furnish the Acquired Fund with a list of the securities, if
any, on the Acquired Fund's list referred to in the first sentence of this
paragraph which do not conform to the Acquiring Fund's investment objectives,
policies and restrictions. In the event that the Acquired Fund holds any
investments which the Acquiring Fund may not hold, the Acquired Fund will
dispose of such securities prior to the Closing Date. In addition, if it is
determined that the portfolios of the Acquired Fund and the Acquiring Fund, when
aggregated, would contain investments exceeding certain percentage limitations
imposed upon the Acquiring Fund with respect to such investments, the Acquired
Fund, if requested by the Acquiring Fund, will dispose of and/or reinvest a
sufficient amount of such in vestments as may be necessary to avoid violating
such limitations as of the Closing Date.

     1.3. As provided in paragraph 3.4, as soon after the Closing Date as is
conveniently practicable, the Acquired Fund will distribute pro rata to the
Acquired Fund's shareholders of record determined as of the close of business on
the Closing Date, the Acquiring Fund Class C Shares it receives pursuant to
paragraph 1.1. Such distribution will be accomplished by establishing Acquiring
Fund shareholder accounts in the names of each Acquired Fund shareholder,
representing the respective pro rata number of full and fractional Acquiring
Fund Class C Shares due each shareholder. All issued and outstanding shares of
the Acquired Fund will simultaneously be canceled on the books of the Acquired
Fund. The Acquiring Fund shall not issue certificates representing the Acquiring
Fund Shares in connection with such exchange.

     1.4. Any transfer taxes payable upon issuance of Acquiring Fund Class C
Shares in a name other than the registered holder of the shares of the Acquired
Fund on the books of the Acquired Fund as of that time shall, as a condition of
such issuance and transfer, be paid by the person to whom such Acquiring Fund
Class C Shares are to be issued and transferred.

     1.5. The Acquired Fund shall, following the Closing Date and the making of
all distributions pursuant to paragraph 1.3, be terminated by a majority of the
Securities Trust's Trustees' executing an instrument pursuant to Section 5.4 of
the Declaration and Agreement of Trust of the Securities Trust abolishing the
Acquired Fund. Any reporting responsibility of the Securities Trust with respect
to the



                                        3
<PAGE>
 
Acquired Fund is and shall remain the responsibility of the Securities Trust up
to and including the Closing Date and following the termination of the Acquired
Fund.

2.   VALUATION

     2.1. The net value of the Acquired Fund's assets to be acquired by the
Acquiring Fund hereunder shall be the value of such assets, less the Acquired
Fund's liabilities assumed by the Acquiring Fund, computed as of the close of
regular trading on New York Stock Exchange, Inc. (the "NYSE") on the Closing
Date (such time and date being hereinafter called the "Valuation Date"), using
the valuation procedures set forth in the Income Trust's Declaration and
Agreement of Trust.

     2.2. The net asset value of one Acquiring Fund Class A Share shall be the
net asset value per share computed as of the close of regular trading on the
NYSE on the Valuation Date, using the valuation procedures set forth in the
Income Trust's Declaration and Agreement of Trust.

     2.3. All computations of value shall be made by the Acquiring Fund and the
Acquired Fund in accordance with the regular practice of the Acquiring Fund.

3.   CLOSING AND CLOSING DATE

     3.1. The Closing Date shall be July 12, 1996, or such other date as the
parties may agree to in writing. All acts taking place at the Closing shall be
deemed to take place simultaneously as of the close of business on the Closing
Date unless otherwise provided. The Closing shall be held as of 5:00 p.m. at the
offices of [specify location in New Jersey], or at such other time and/or place
as the parties may agree.

     3.2. In the event that on the Valuation Date (a) the NYSE or another
primary trading market for portfolio securities of the Acquiring Fund or the
Acquired Fund shall be closed to trading or trading thereon shall be restricted
or (b) trading or the reporting of trading on the NYSE or elsewhere shall be
disrupted so that accurate appraisal of the value of the net assets of the
Acquiring Fund or the Acquired Fund is impracticable, the Closing Date shall be
postponed until the first business day after the day when trading shall have
been fully resumed and reporting shall have been restored.

     3.3. At the Closing, the Acquired Fund shall direct its custodian to
deliver to the custodian of the Acquiring Fund, for the Acquiring Fund's
account, all of its portfolio securities and other assets held by such custodian
for the Acquired



                                        4
<PAGE>
 
Fund's account, duly endorsed in proper form for transfer as appropriate, in
such condition as to constitute good delivery thereof in accordance with the
custom of the Acquiring Fund's custodian, and shall be accompanied by all
necessary federal and state stock transfer stamps or a check for the appropriate
purchase price thereof.

     3.4. The Acquired Fund shall direct its transfer agent to deliver to the
transfer agent of the Acquiring Fund on the Closing Date a list of the names and
addresses of the Acquired Fund's shareholders and the number of outstanding
shares owned by each such shareholder immediately prior to the Closing. The
Acquiring Fund shall direct its transfer agent to issue and deliver a
confirmation evidencing the Acquiring Fund Class C Shares to be credited to the
Acquired Fund's account on the Closing Date to the transfer agent of the
Acquired Fund, or provide evidence satisfactory to the Acquired Fund that such
Acquiring Fund Class C Shares have been credited to the Acquired Fund's account
on the books of the Acquiring Fund. At the Closing, each party shall deliver to
the other such bills of sale, checks, assignments, share certificates, if any,
receipts, assumption agreements or other documents as such other party or its
counsel may reasonably request.

   
4.   REPRESENTATIONS AND WARRANTIES
    

     4.1. With respect to the Acquired Fund, the Securities Trust represents and
warrants to the Acquiring Fund as follows:

          (a) The Securities Trust is a registered investment company classified
     as a management company of the open-end type, and its registration with the
     Securities and Exchange Commission (the "Commission") as an investment
     company under the 1940 Act is in full force and effect.

          (b) The Acquired Fund is a series of the Securities Trust. The
     Securities Trust is duly organized, validly existing and in good standing
     under the laws of the State of Delaware and has the power to own all of its
     properties and assets and to carry out this Agreement.

          (c) The current prospectus and statement of additional information of
     the Securities Trust conform (and any prospectus or statement of additional
     information of the Securities Trust issued prior to the Closing Date will
     conform) in all material respects to the applicable requirements of the
     Securities Act of 1933 Act, as amended (the "1933 Act"), and the 1940 Act
     and the rules and regulations of the Commission thereunder and do not (and
     will not) include any untrue statement of a material fact or omit to state
     any material fact required to be stated therein or necessary to make the
     statements



                                       5
<PAGE>
 
     therein, in light of the circumstances under which they were (and will be)
     made, not materially misleading.

          (d) The Securities Trust is not, and the execution, delivery and
     performance of this Agreement will not result in, a material violation of
     its Declaration and Agreement of Trust or By-laws or of any agreement,
     instrument, contract or other undertaking to which the Securities Trust is
     a party or by which it is bound.

          (e) The Securities Trust has no material contracts or other
     commitments which will be terminated with liability to the Securities Trust
     on, prior to or after the Closing Date.

          (f) Except as otherwise disclosed in writing to and accepted by the
     Acquiring Fund, no litigation or administrative proceeding or investigation
     before any court or governmental body is presently pending or to its
     knowledge threatened against the Securities Trust or any of the Acquired
     Fund's properties or assets, which if adversely determined would materially
     and adversely affect the financial condition of the Acquired Fund or the
     conduct of the Acquired Fund's business. The Securities Trust knows of no
     facts which might form the basis of the institution of such a proceeding
     and is not party to or subject to the provisions of any order, decree or
     judgment of any court or governmental body which materially and adversely
     affects the business of the Acquired Fund or the ability of the Securities
     Trust to consummate the transactions contemplated herein.

          (g) True and correct copies of the Acquired Fund's (i) Statement of
     Net Assets as at October 31, 1995 and (ii) Statements of Operations and
     Changes in Net Assets for the 12-month period then ended, including the
     accompanying notes, have been furnished to the Acquiring Fund. Such
     Statement of Net Assets and such Statements of Operations and Changes in
     Net Assets (and the accompanying notes) have been audited by Deloitte &
     Touche LLP, independent certified public accountants. Such statements have
     been prepared in accordance with generally accepted accounting principles
     consistently applied, and such statements fairly reflect the financial
     condition and the operations and changes in net assets of the Acquired Fund
     as of such date and for such period, respectively. There are no known
     contingent liabilities of the Acquired Fund as of such date required to be
     reflected or disclosed in such Statement of Net Assets or notes in
     accordance with generally accepted accounting principles that are not so
     reflected or disclosed.



                                       6
<PAGE>
 
          (h) Since October 31, 1995, there has not been any material adverse
     change in the Acquired Fund's financial condition, assets, liabilities or
     business other than changes occurring in the ordinary course of business,
     or any incurrence by the Acquired Fund of indebtedness maturing more than
     one year from the date such indebtedness was incurred, except as otherwise
     disclosed to and accepted by the Acquiring Fund.

          (i) The Securities Trust will file the final federal and other tax
     returns of the Acquired Fund for the period ending on the Closing Date in
     accordance with the Code. At the Closing Date, all federal and other tax
     returns and reports of the Acquired Fund required by law to have been filed
     prior to the Closing Date shall have been filed, and all federal and other
     taxes shown as due on such returns shall have been paid, or provision shall
     have been made for the payment thereof, and to the best of the Securities
     Trust's knowledge, no such return is currently under audit and no
     assessment has been asserted with respect to such returns.

          (j) For the most recent fiscal year of its operation, the Acquired
     Fund has met the requirements of Subchapter M of the Code for qualification
     and treatment as a regulated investment company.

          (k) All issued and outstanding shares of the Acquired Fund are, and at
     the Closing Date will be, duly and validly issued and outstanding, fully
     paid and non-assessable. All of the issued and outstanding shares of the
     Acquired Fund will, at the time of Closing, be held of record by the
     persons and in the amounts set forth in the records of the transfer agent
     as provided in paragraph 3.4. The Acquired Fund does not have outstanding
     any options, warrants or other rights to subscribe for or purchase any
     shares of the Acquired Fund, nor is there outstanding any security
     convertible into any shares of the Acquired Fund.

          (l) At the Closing Date, the Acquired Fund will have good and
     marketable title to its assets to be transferred to the Acquiring Fund
     pursuant to paragraph 1.1 and full right, power and authority to sell,
     assign, transfer and deliver such assets hereunder and, upon delivery and
     payment for such assets, the Acquiring Fund will acquire good and
     marketable title thereto, subject to no restrictions on the full transfer
     thereof, including such restrictions as might arise under the 1933 Act,
     other than as disclosed to the Acquiring Fund prior to the date hereof.



                                       7
<PAGE>
 
          (m) The execution, delivery and performance of this Agreement has been
     duly authorized by all necessary action on the part of Securities Trust's
     Trustees, and subject to the due approval of the Acquired Fund's
     shareholders, this Agreement, assuming due authorization, execution and
     delivery by the Acquiring Fund, constitutes a valid and binding obligation
     of the Securities Trust on behalf of the Acquired Fund, enforceable in
     accordance with its terms, subject as to enforcement to bankruptcy,
     insolvency, reorganization, moratorium and other laws relating to or
     affecting creditors' rights and to general equity principles. The
     Securities Trust's Board of Trustees has called a meeting of the Securities
     Trust's shareholders at which the shareholders of the Acquired Fund are to
     consider and act upon this Agreement.

          (n) The information furnished and to be furnished by the Securities
     Trust on behalf of the Acquired Fund for use in registration statements,
     proxy materials and other documents which may be necessary in connection
     with the transactions contemplated hereby shall be accurate and complete in
     all material respects and shall comply in all material respects with
     federal securities and other laws and regulations thereunder applicable
     thereto.

          (o) The combined prospectus and proxy statement (the "N-14 prospectus
     and proxy statement") and the related statement of additional information
     included in the Registration Statement on Form N-14 of the Acquiring Fund
     (the "N-14 Registration Statement") did not on the effective date of the
     N-14 Registration Statement contain any untrue statement of a material fact
     relating to the Acquired Fund or the meeting of the Securities Trust
     shareholders referred to therein or omit to state a material fact required
     to be stated therein or necessary to make the statements therein relating
     to the Acquired Fund or such special meeting, in light of the circumstances
     under which such statements were made, not materially misleading.

          (p) The Acquiring Fund Class C Shares to be issued to the Acquired
     Fund hereunder are not being acquired for the purpose of making any
     distribution thereof other than in accordance with the terms of this
     Agreement.

          4.2. With respect to the Acquiring Fund, the Income Trust represents
     and warrants to the Acquired Fund as follows:

          (a) The Income Trust is a registered investment company classified as
     a management company of the open-end type, and its registration with the
     Commission as an investment company under the 1940 Act is in full force and
     effect.



                                       8
<PAGE>
 
          (b) The Acquiring Fund is a series of the Income Trust. The Income
     Trust is a business trust duly organized, validly existing and in good
     standing under the laws of the State of Massachusetts and has the power to
     own all of its properties and assets and to carry out this Agreement.

          (c) The current prospectus and statement of additional information of
     the Income Trust conform (and any prospectus or statement of additional
     information of the Income Trust issued prior to the Closing Date will
     conform) in all material respects to the applicable requirements of the
     1933 Act and the 1940 Act and the rules and regulations of the Commission
     thereunder and do not (and will not) include any untrue statement of a
     material fact or omit to state any material fact required to be stated
     therein or necessary to make the statements therein, in light of the
     circumstances under which they were (or will be) made, not materially
     misleading.

          (d) The Income Trust is not, and the execution, delivery and
     performance of this Agreement will not result in, a material violation of
     its Declaration and Agreement of Trust or By-laws or of any agreement,
     instrument, contract or other undertaking to which the Income Trust is a
     party or by which it is bound.

          (e) The Income Trust has no material contracts or other commitments
     which will be terminated with liability to the Income Trust on, prior to or
     after the Closing Date.

          (f) Except as otherwise disclosed in writing to and accepted by the
     Acquired Fund, no litigation or administrative proceeding or investigation
     before any court or governmental body is presently pending or to its
     knowledge threatened against the Income Trust or any of the Acquiring
     Fund's properties or assets, which, if adversely determined, would
     materially and adversely affect its financial condition or the conduct of
     its business. The Income Trust knows of no facts which might form the basis
     of the institution of such a proceeding and is not party to or subject to
     the provisions of any order, decree or judgment of any court or
     governmental body which materially and adversely affects its business or
     its ability to consummate the transactions contemplated herein.

          (g) True and correct copies of the Acquiring Fund's (i) Statement of
     Net Assets as at October 31, 1995, and (ii) Statements of Operation and
     Changes in Net Assets for the 12-month period then ended, including the
     accompanying notes, have been furnished to the Securities Trust. Such



                                       9
<PAGE>
 
     Statement of Net Assets and such Statements of Operations and Changes in
     Net Assets (and the accompanying notes) have been audited by Deloitte &
     Touche LLP, independent certified public accountants. Such statements have
     been prepared in accordance with generally accepted accounting principles
     consistently applied, and such statements fairly reflect the financial
     condition and the operations and changes in net assets of the Acquiring
     Fund as of such date and for such period, respectively. There are no known
     contingent liabilities of the Acquiring Fund as of such date required to be
     reflected or disclosed in such Statements of Net Assets or notes in
     accordance with generally accepted accounting principles that are not so
     reflected or disclosed.

          (h) Since October 31, 1995, there has not been any material adverse
     change in the Acquiring Fund's financial condition, assets, liabilities or
     business other than changes occurring in the ordinary course of business,
     or any incurrence by the Acquiring Fund of indebtedness maturing more than
     one year from the date such indebtedness was incurred, except as otherwise
     disclosed to and accepted by the Acquired Fund.

          (i) At the Closing Date, all federal and other tax returns and reports
     of the Income Trust required by law to have been filed prior to the Closing
     Date shall have been filed, and all federal and other taxes shown as due on
     such returns and reports shall have been paid, or provision shall have been
     made for the payment thereof, and to the best of the Acquiring Fund's
     knowledge, no such return is currently under audit and no assessment has
     been asserted with respect to such returns.

          (j) For the most recent fiscal year of its operation, the Acquiring
     Fund has met the requirements of Subchapter M of the Code for qualification
     and treatment as a regulated investment company and the Acquiring Fund
     intends to do so in the future.

          (k) All issued and outstanding shares of the Acquiring Fund are, and
     at the Closing Date will be, duly and validly issued and outstanding, fully
     paid and non-assessable, with no personal liability attaching to the
     ownership thereof. The Acquiring Fund does not have outstanding any
     options, warrants or other rights to subscribe for or purchase any shares
     of the Acquiring Fund, nor is there outstanding any security convertible
     into shares of the Acquiring Fund.

          (l) At the Closing Date, the Acquiring Fund will have good and
     marketable title to the Acquiring Fund's assets.



                                       10
<PAGE>
 
          (m) The execution, delivery and performance of this Agreement has been
     duly authorized by all necessary action on the part of the Income Trust's
     Board of Trustees, and assuming due authorization, execution and delivery
     by the Acquired Fund, this Agreement constitutes a valid and binding
     obligation of the Income Trust on behalf of the Acquiring Fund, enforceable
     in accordance with its terms, subject as to enforcement to bankruptcy,
     insolvency, reorganization, moratorium and other laws relating to or
     affecting creditors' rights and to general equity principles.

          (n) The N-14 Registration Statement (except insofar as it relates to
     the Acquired Fund or the special meeting of its shareholders referred to
     therein) did not on the effective date of the N-14 Registration Statement
     contain any untrue statement of a material fact or omit to state a material
     fact required to be stated therein or necessary to make the statements
     therein, in light of the circumstances under which such statements were
     made, not materially misleading.

          (o) The Acquiring Fund Class C Shares to be issued and delivered to
     the Acquired Fund pursuant to the terms of this Agreement have been duly
     authorized by the Board of Trustees of the Income Trust, and, when issued
     and delivered at the Closing in accordance with this Agreement, will be
     duly and validly issued Acquiring Fund Class C Shares and will be fully
     paid and non-assessable with no personal liability attaching to the
     ownership thereof.

          (p) The Board of Trustees of the Income Trust has duly adopted a
     amendments to the Income Trust's Declaration and Agreement of Trust (copies
     of which have been furnished to the Securities Trust) authorizing the Board
     of Trustees to create classes of shares within series (which amendment was
     duly approved by the shareholders of the Income Trust) and providing for
     the creation and issuance of Acquiring Fund Class C Shares. Such amendments
     have been duly filed with the Secretary of State of the Commonwealth of
     Massachusetts.

5.   COVENANTS

     5.1. The Acquiring Fund and the Acquired Fund each will operate its
business in the ordinary course between the date hereof and the Closing Date. It
is understood that such ordinary course of business will include the declaration
and payment of customary dividends and distributions and any other dividends and
distributions deemed advisable.



                                       11
<PAGE>
 
     5.2. At or after the Closing, the Securities Trust will deliver or
otherwise make available to the Income Trust a statement of the Acquired Fund's
assets and liabilities, together with a list of the Acquired Fund's portfolio
securities showing the tax costs of such securities to it and the holding
periods of such securities, as of the Closing Date.

     5.3. The Acquired Fund will assist the Acquiring Fund in obtaining such
information as the Acquiring Fund reasonably requests concerning the beneficial
ownership of the Acquired Fund's shares.

     5.4. Subject to the provisions of this Agreement, the Acquired Fund and the
Acquiring Fund each will take, or cause to be taken, all action, and do or cause
to be done all things, reasonably necessary, proper or advisable to consummate
and make effective the transactions contemplated by this Agreement.

     5.5. Prior to the Closing Date, the Board of Trustees of the Securities
Trust will declare such dividends and distributions, payable no later than [90]
days after the Closing Date, to shareholders of record of the Acquired Fund as
of the Closing Date, which, together with all such previous dividends and
distributions, shall have the effect of distributing to the shareholders of the
Acquired Fund all of the investment company taxable income and exempt-interest
income of the Acquired Fund for all taxable years ending on or prior to the
Closing Date. The dividends and distributions declared by the Acquired Fund
shall also include all of the Acquired Fund's net capital gain realized in all
taxable years ending on or prior to the Closing Date (after reduction for any
capital loss carry forward). Such dividends and distributions declared prior to
the Closing Date shall be paid by the Acquiring Fund no later than [90] days
after the Closing Date.

     5.6. As promptly as practicable, but in any case within sixty days after
the Closing Date, the Acquired Fund shall furnish the Acquiring Fund, in such
form as is reasonably satisfactory to the Acquiring Fund, a statement of the
earnings and profits of the Acquired Fund for federal income tax purposes which
will be carried over to the Acquiring Fund as a result of Section 381 of the
Code.

     5.7. The Acquired Fund will provide the Acquiring Fund with any additional
information reasonably necessary for any revision of the N-14 Prospectus and
Proxy Statement referred to in paragraph 4.1(o), all to be included in any
amendment to the N-14 Registration Statement, in compliance with the 1933 Act,
the



                                       12
<PAGE>
 
Securities Exchange Act of 1934 (the "1934 Act") and the 1940 Act in connection
with the meeting of the Acquired Fund's shareholders to consider approval of
this Agreement and the Reorganization.

6.   CONDITIONS PRECEDENT TO OBLIGATIONS OF THE SECURITIES TRUST

     The obligations of the Securities Trust, on behalf of the Acquired Fund, to
consummate the transactions provided for herein shall be subject, at its
election, to the performance by the Income Trust in all material respects of all
of the obligations to be performed by it hereunder on or before the Closing Date
and, in addition thereto, the following further conditions:

     6.1. All representations and warranties of the Income Trust contained in
this Agreement shall be true and correct in all material respects as of the date
hereof and, except as they may be affected by the transactions contemplated by
this Agreement, as of the Closing Date with the same force and effect as if made
on and as of the Closing Date.

     6.2. The Acquiring Fund shall have delivered to the Acquired Fund a
certificate executed in its name by its Chairman, President or a Vice President
and its Treasurer or an Assistant Treasurer, in form reasonably satisfactory to
the Acquired Fund and dated as of the Closing Date, to the effect that the
representations and warranties of the Income Trust made in this Agreement are
true and correct at and as of the Closing Date, except as they may be affected
by the transactions contemplated by this Agreement.

7.   CONDITIONS PRECEDENT TO OBLIGATIONS OF THE INCOME TRUST

     The obligations of the Income Trust, on behalf of the Acquiring Fund, to
consummate the transactions provided for herein shall be subject, at its
election, to the performance by the Securities Trust in all material respects of
all the obligations to be performed by it hereunder on or before the Closing
Date and, in addition thereto, the following further conditions:

     7.1. All representations and warranties of the Securities Trust contained
in this Agreement shall be true and correct in all material respects as of the
date hereof and, except as they may be affected by the transactions contemplated
by this Agreement, as of the Closing Date with the same force and effect as if
made on and as of the Closing Date.



                                       13
<PAGE>
 
     7.2. The Securities Trust shall have delivered to the Acquiring Fund on the
Closing Date a certificate executed in its name by its Chairman, President or a
Vice President and its Treasurer or an Assistant Treasurer, in form and
substance satisfactory to the Acquiring Fund and dated as of the Closing Date,
to the effect that the representations and warranties of the Securities Trust
made in this Agreement are true and correct at and as of the Closing Date,
except as they may be affected by the transactions contemplated by this
Agreement.

8.   FURTHER CONDITIONS PRECEDENT TO OBLIGATIONS OF THE SECURITIES TRUST AND THE
     INCOME TRUST

     If any of the conditions set forth below do not exist on the Closing Date
with respect to the Acquiring Fund or the Acquired Fund, either party to this
Agreement shall, at its option, not be required to consummate the transactions
contemplated by this Agreement:

     8.1. This Agreement and the transactions contemplated herein shall have
been approved by the requisite vote of the holders of the outstanding shares of
the Acquired Fund in accordance with the provisions of the Securities Trust's
Declaration and Agreement of Trust and By-laws. Notwithstanding anything herein
to the contrary, neither the Acquiring Fund nor the Acquired Fund may waive the
conditions set forth in this paragraph 8.1.

     8.2. On the Closing Date, no action, suit or other proceeding shall be
pending before any court or governmental agency in which it is sought to
restrain or prohibit, or obtain damages or other relief in connection with, this
Agreement or the transactions contemplated herein.

     8.3. All consents of other parties and all other consents, orders, rulings
and permits of federal, state and local regulatory authorities (including those
of the Commission, the Internal Revenue Service and state Blue Sky and
securities authorities) deemed necessary by the Acquiring Fund or the Acquired
Fund to permit consummation, in all material respects, of the transactions
contemplated hereby shall have been obtained, except where failure to obtain any
such consent, order, ruling or permit would not involve a risk of a material
adverse effect on the assets or properties of the Acquiring Fund or the Acquired
Fund.

     8.4. The N-14 Registration Statement shall have become effective under the
1933 Act and no stop orders suspending the effectiveness thereof shall have been
issued and, to the best knowledge of the parties hereto, no investigation or



                                       14
<PAGE>
 
proceeding for that purpose shall have been instituted or be pending, threatened
or contemplated under the 1933 Act.

     8.5. The parties shall have received a favorable opinion of Debevoise &
Plimpton, addressed to the Income Trust and the Securities Trust and
satisfactory to the Secretary of each such party, substantially to the effect
that for federal income tax purposes:

          (a) the acquisition by the Acquiring Fund of all of the assets of the
     Acquired Fund solely in exchange for the issuance of Acquiring Fund Class C
     Shares to the Acquired Fund and the assumption of all of the Acquired Fund
     liabilities by the Acquiring Fund, followed by the distribution by the
     Acquired Fund, in complete liquidation, of the Acquiring Fund Class C
     Shares to the Acquired Fund shareholders in exchange for their Acquired
     Fund shares, will be treated as a "reorganization" within the meaning of
     Section 368(a) of the Code, and the Acquiring Fund and the Acquired Fund
     will each be a "party to a reorganization" within the meaning of Section
     368(b) of the Code;

          (b) no gain or loss will be recognized by the Acquiring Fund upon the
     receipt of the assets of the Acquired Fund in exchange for the Acquiring
     Fund Shares and the assumption by the Acquiring Fund of liabilities of the
     Acquired Fund;

          (c) no gain or loss will be recognized by the Acquired Fund upon the
     transfer of the Acquired Fund's assets to the Acquiring Fund in exchange
     for the Acquiring Fund Shares and the assumption by the Acquiring Fund of
     liabilities of the Acquired Fund or upon the distribution of the Acquiring
     Fund Shares to the Acquired Fund's shareholders;

          (d) no gain or loss will be recognized by shareholders of the Acquired
     Fund upon the exchange of their Acquired Fund shares for the Acquiring Fund
     Shares;

          (e) the aggregate tax basis for the Acquiring Fund Shares received by
     each of the Acquired Fund's shareholders pursuant to the Reorganization
     will be the same as the aggregate tax basis of the Acquired Fund shares
     held by such shareholder immediately prior to the Reorganization, and the
     holding period of the Acquiring Fund Shares to be received by each Acquired
     Fund shareholder will include the period during which the Acquired Fund
     shares exchanged therefor were held by such shareholder (provided that the
     Acquired Fund shares were held as capital assets on the date of the
     Reorganization); and



                                       15
<PAGE>
 
          (f) the tax basis of the Acquired Fund's assets acquired by the
     Acquiring Fund will be the same as the tax basis of such assets to the
     Acquired Fund immediately prior to the Reorganization, and the holding
     period of the assets of the Acquired Fund in the hands of the Acquiring
     Fund will include the period during which those assets were held by the
     Acquired Fund.

     Notwithstanding anything herein to the contrary, neither the Income Trust
nor the Securities Trust may waive the conditions set forth in this paragraph
8.5.

     8.6. The Acquiring Fund shall have duly adopted a Rule 12b-1 Plan for the
Acquiring Fund Class C Shares acceptable to the Securities Trust.

9.   BROKERAGE FEES AND EXPENSES

     9.1. The Income Trust represents and warrants to the Acquired Fund, and the
Securities Trust represents and warrants to the Acquiring Fund, that there are
no brokers or finders entitled to receive any payments in connection with the
transactions provided for herein.

     9.2. Except as may be otherwise provided herein, the Acquiring Fund and the
Acquired Fund each shall pay, or provide for the payment of, the expenses
incurred by it in connection with entering into and carrying out the provisions
of this Agreement.

10.  ENTIRE AGREEMENT; SURVIVAL OF WARRANTIES

     10.1. The parties hereto agree that no party has made any representation,
warranty or covenant not set forth herein and that this Agreement constitutes
the entire agreement between the parties.

     10.2. None of the representations and warranties included or provided for
herein shall survive the consummation of the transactions contemplated hereby.

11.  TERMINATION

     11.1. This Agreement may be terminated at any time prior to the Closing
Date: (1) by the mutual agreement of the Securities Trust and the Income Trust;
(2) by the Securities Trust in the event that the Income Trust shall, or by the
Income Trust in the event that the Securities Trust shall, materially breach any



                                       16
<PAGE>
 
representation or warranty contained herein or any agreement contained herein
and to be performed at or prior to the Closing Date; or (3) by either party if a
condition herein expressed to be precedent to the obligations of the terminating
party has not been met and it reasonably appears that it will not or cannot be
met.

     11.2. In the event of any such termination, there shall be no liability for
damages on the part of either the Securities Trust, the Income Trust, the
Acquired Fund or the Acquiring Fund or their respective trustees or officers to
the other party, but the Acquiring Fund and the Acquired Fund shall each bear,
or provide for the payment of, the expenses incurred by it incidental to the
preparation and carrying out of this Agreement as provided in paragraph 9.2.

12.  AMENDMENTS; WAIVERS

     12.1. This Agreement may be amended, modified or supplemented in such
manner as may be mutually agreed upon in writing by the authorized officers of
the Securities Trust and the Income Trust; provided, however, that following the
approval of the Acquired Fund shareholders referred to in paragraph 8.1, no such
amendment may have the effect of changing the provisions for determining the
number of the Acquiring Fund Class C Shares to be issued to the Acquired Fund's
shareholders under this Agreement to the detriment of such shareholders without
their further approval.

     12.2. At or at any time prior to the Closing either party hereto may by
written instrument signed by it (i) waive any inaccuracies in the
representations and warranties made to it contained herein and (ii) waive
compliance with any of the covenants or conditions made for its benefit
contained herein.

13.  NOTICES

   
     Any notice, report, statement or demand required or permitted by any
provisions of this Agreement shall be in writing and shall be given by personal
delivery addressed to Lord Abbett Securities Trust on behalf of its series Lord
Abbett Florida Tax-Free Income Trust, 767 Fifth Avenue, New York, New York,
10153, Attention: Office of the Secretary; or to Lord Abbett Tax-Free Income
Trust on behalf of its Florida Series, 767 Fifth Avenue, New York, New York,
10153, Attention: Office of the Secretary.
    



                                       17
<PAGE>
 
14.  HEADINGS; COUNTERPARTS; GOVERNING LAW; ASSIGNMENT; LIMITATION OF LIABILITY

     14.1. The article and paragraph headings contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.

     14.2. This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original.

     14.3. This Agreement shall be governed by and construed in accordance with
the laws of the State of Florida.

     14.4. (a) This Agreement shall bind and inure to the benefit of the parties
hereto and their respective successors and assigns, but no assignment or
transfer hereof or of any rights or obligations hereunder shall be made by any
party without the written consent of the other party. Nothing herein expressed
or implied is intended or shall be construed to confer upon or give any person,
firm, corporation or other entity, other than the parties hereto and their
respective successors and assigns, any rights or remedies under or by reason of
this Agreement.



                                       18
<PAGE>
 
     (b) The Acquiring Fund is hereby expressly put on notice of the limitation
of liability as set forth in Article IV of the Declaration and Agreement of
Trust of the Securities Trust and agrees that the obligations assumed by the
Securities Trust pursuant to this Agreement shall be limited in any case to the
Acquired Fund and its assets and the Income Trust shall not seek satisfaction of
any such obligation from the shareholders of the Securities Trust, the trustees,
officers, employees or agents of the Securities Trust or any of them or from any
other assets of the Securities Trust.

     IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to
be executed by its Chairman of the Board, President or Vice President and
attested by its Secretary or Assistant Secretary.


Attest:                             LORD ABBETT SECURITIES TRUST
                                    on behalf of Lord Abbett Florida Tax-Free
                                    Income Trust


                                    By:   _______________________________
Name:  _____________                Name:
Title:  Secretary                   Title:




Attest:                             LORD ABBETT TAX-FREE INCOME TRUST,
                                    on behalf of the Florida Series




                                    By:   _______________________________
Name:  _____________                Name:
Title:  Secretary                   Title:



                                       19
<PAGE>
 
   
                                                                       EXHIBIT B
                                                                       ---------


           Comparison of Certain Investment Policies and Restrictions

     Comparison of fundamental and certain non-fundamental investment policies
and restrictions of Lord Abbett Florida Tax-Free Income Trust (the "Acquired
Fund"), a series of Lord Abbett Securities Trust, and Lord Abbett Tax-Free
Income Trust (the "Acquiring Fund") and of the Acquiring Fund as proposed to be
revised.
    


<TABLE>    
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
       Policy/Restriction of the              Policy/Restriction of the             Proposed Policy/Restriction of
             Acquired Fund                         Acquiring Fund                         the Acquiring Fund
- --------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                                      <C>
SHORT SALES/MARGIN.
Fundamental                            Fundamental                              Non-fundamental
The Fund may not sell short or buy     The Fund may not sell short or buy       The Fund may not make short sales
on margin.                             on margin.                               of securities or maintain a short
                                                                                position except to the extent
                                                                                permitted by applicable law.

                                                                                Fundamental
                                                                                The Fund may purchase securities on
                                                                                margin to the extent permitted by
                                                                                applicable law.

- --------------------------------------------------------------------------------------------------------------------------
BORROWING.
Fundamental                            Fundamental                              Fundamental
The Fund may not borrow money,         The Fund may not borrow money,           The Fund may not borrow money,
unless such borrowing does not ex      unless such borrowing does not ex        except that (i) the Fund may borrow
ceed the asset coverage                ceed the asset coverage requirements     from banks (as defined in the 1940
requirements of Section 18(f) of the   of Section 18(f) of the Act and unless   Act) in amounts up to 33 1/3% of its
Act and unless such borrowing on       such borrowing on behalf of the          total assets (including the amount
behalf of the Acquired Fund shall      Acquiring Fund shall be a liability      borrowed), (ii) the Fund may borrow
be a liability only of the Acquired    only of the Acquiring Fund and not of    up to an additional 5% of its total
Fund and not of any other series of    any other series of Lord Abbett Tax-     assets for temporary purposes, and
Lord Abbett Securities Trust.          Free Income Trust.                       (iii) the Fund may obtain such short-
                                                                                term credit as may be necessary for
                                                                                the clearance of purchases and sales
                                                                                of portfolio securities.

                                                                                Non-fundamental
                                                                                The Fund may not borrow in excess
                                                                                of 5% of its gross assets taken at cost
                                                                                or market value, whichever is lower
                                                                                at the time of borrowing, and then
                                                                                only as a temporary measure for
                                                                                extraordinary or emergency
                                                                                purposes.
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>     
<PAGE>
 
<TABLE>    
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
       Policy/Restriction of the              Policy/Restriction of the             Proposed Policy/Restriction of
             Acquired Fund                         Acquiring Fund                         the Acquiring Fund
- --------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                                      <C>

UNDERWRITING.
Fundamental                            Fundamental                              Fundamental
The Fund may not engage in the         The Fund may not engage in the           The Fund may not engage in the
underwriting of securities, except     underwriting of securities unless it is  underwriting of securities, except,
pursuant to a merger or acquisition    deemed to be an underwriter  in          pursuant to a merger or acquisition
or to the extent that, in connection   selling a portfolio security requiring   or to the extent that, in connection
with the disposition of its portfolio  registration under the Securities Act    with the disposition of its portfolio
securities, it may be deemed to be     of 1933.                                 securities, it may be deemed to be an
an underwriter under federal                                                    underwriter under federal securities
securities laws.                                                                laws.

- --------------------------------------------------------------------------------------------------------------------------
LENDING.
Fundamental                            Fundamental                              Fundamental
The Fund may not lend money or         The Fund may not lend money or           The Fund may not make loans to
securities to any person, except that  securities, except for the purchase of   other persons, except that the acqui
it may lend money for the purchase     debt securities in which it may invest   sition of bonds, debentures or other
of debt securities in which it may     consistent with its investment           corporate debt securities and invest
invest consistent with its investment  objective and policies.                  ment in government obligations,
objectives and policies.                                                        commercial paper, pass-through in
                                                                                struments, certificates of deposit,
                                                                                bankers acceptances, repurchase
                                                                                agreements or any similar
                                                                                instruments shall not be subject to
                                                                                this limitation, and except further
                                                                                that the Fund may lend its portfolio
                                                                                securities, provided that the lending
                                                                                of portfolio securities may be made
                                                                                only in accordance with applicable
                                                                                law.
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>     

                                       2
<PAGE>
 
<TABLE>    
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
       Policy/Restriction of the              Policy/Restriction of the             Proposed Policy/Restriction of
             Acquired Fund                         Acquiring Fund                         the Acquiring Fund
- --------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                                      <C>
REAL ESTATE/COMMODITIES.               Fundamental                              Fundamental
Fundamental                            The Fund may not deal in real estate,    The Fund may not buy or sell real
The Fund may not deal in real          including real estate mortgages in the   estate (except that the Fund may in
estate, commodities or commodity       ordinary course of its business          vest in securities directly or
contracts, excluding marketable        (except that it may invest in            indirectly secured by real estate or
securities secured by real estate or   marketable securities secured by real    interests therein or issued by
interests therein and options and      estate or interests therein) or          companies which invest in real
financial futures contracts not        commodities, commodity contracts,        estate or interests therein) or
deemed to be commodities or            and gas, oil or mineral leases,          commodities or commodity contracts
commodities contracts.                 excluding the securities of companies    (except to the extent the Fund may
                                       which deal in or hold real estate or     do so in accordance with applicable
                                       commodities.                             law and without registering as a
                                                                                commodity pool operator under the
                                                                                Commodity Exchange Act as, for
                                                                                example, with futures contracts).

                                                                                Non-fundamental
                                                                                The Fund may not invest in real
                                                                                estate limited partnership interests or
                                                                                interests in oil, gas or other mineral
                                                                                leases, or exploration or other
                                                                                development programs, except that
                                                                                the Fund may invest in securities
                                                                                issued by companies that engage in
                                                                                oil, gas or other mineral exploration
                                                                                or development activities.

- --------------------------------------------------------------------------------------------------------------------------
DIVERSIFICATION.                       Fundamental
None.                                  The Fund may not buy securities of       Non-fundamental
                                       one issuer representing more than        None stated (but the Fund will be
                                       10% of outstanding voting stock of       required to meet the diversification
                                       such issuer.                             rules under Subchapter M of the
                                                                                Internal Revenue Code).

- --------------------------------------------------------------------------------------------------------------------------
INVESTMENT IN A SINGLE
INDUSTRY.
Fundamental                            Fundamental                              Fundamental
The Fund may not concentrate its       The Fund may not concentrate its         The Fund may not invest more than
investments in any single industry,    investments in any single industry,      25% of its assets, taken at market
except that the Fund may invest        except that the Fund may invest more     value, in the securities of issuers in
more than 25% of its gross assets,     than 25% of its gross assets, taken at   any particular industry (excluding (i)
taken at market value, in tax-         market value, in tax-exempt              tax-exempt securities, such as those
exempt securities.                     securities.                              financing facilities in the same
                                                                                industry or issued by non-govern
                                                                                mental users and (ii) the securities of
                                                                                the U.S. Government, its agencies or
                                                                                instrumentalities).
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>     

                                       3
<PAGE>
 
<TABLE>    
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
       Policy/Restriction of the              Policy/Restriction of the             Proposed Policy/Restriction of
             Acquired Fund                         Acquiring Fund                         the Acquiring Fund
- --------------------------------------------------------------------------------------------------------------------------
<S>                                     <C>                                      <C>
RESTRICTED/ILLIQUID                    
SECURITIES.  
Non-fundamental                         Fundamental                              Non-fundamental
The Fund may not invest more than       The Fund may not invest more than        The Fund may not invest, knowingly,
15% of its net assets in restricted or  10% of its net assets in restricted or   more than 15% of its net assets (at
illiquid securities, except, subject to illiquid securities, except, subject to  the time of investment) in illiquid
state law, for securities qualifying    state law, for securities qualifying for securities, except for securities
for resale under Rule 144A of the       resale under Rule 144A of the            qualifying for resale under Rule
Securities Act of 1933, deemed to       Securities Act of 1933, deemed to be     144A of the Securities Act of 1933,
be liquid by the Board of Trustees.     liquid by the Board of Trustees.         deemed to be liquid by the Board of
                                                                                 Trustees.
- --------------------------------------------------------------------------------------------------------------------------
MORTGAGING AND PLEDGING
OF ASSETS.
Fundamental                             Fundamental                              Fundamental
The Fund may not, with certain          The Fund may not, with certain           The Fund may not pledge its assets
exceptions, pledge, mortgage or         exceptions, pledge, mortgage or          (other than to secure borrowings, or
hypothecate its assets.                 hypothecate its assets.                  to the extent permitted by the Fund's
                                                                                 investment policies, as permitted by
                                                                                 applicable law).
- --------------------------------------------------------------------------------------------------------------------------
INVESTMENTS IN SECURITIES
OF OTHER INVESTMENT
COMPANIES.
Fundamental                             Fundamental                              Non-fundamental
The Fund may not, with certain          The Fund may not invest in the           The Fund may not invest in the
exceptions, invest in the securities    securities of other investment           securities of other investment
of other investment companies.          companies, except pursuant to a          companies, except as permitted by
                                        merger, acquisition or consolidation.    applicable law.
- --------------------------------------------------------------------------------------------------------------------------
OPTIONS.
Fundamental                             Fundamental                              Non-fundamental
The Fund may not buy or sell puts       The Fund may not buy or sell puts,       The Fund may not write, purchase or
or calls, straddle or spread options,   calls, straddle or spread options,       sell puts, calls, straddles, spreads or
although the Fund may buy, hold or      except that the Fund may buy, hold or    combinations thereof, except to the
sell options and financial futures      sell certain options and financial       extent permitted in the Fund's
and buy or sell oil, gas and mineral    futures.                                 prospectus and statement of
leases.                                                                          additional information, as they may
                                                                                 be amended from time to time.
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>     

                                       4
<PAGE>
 
<TABLE>    
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
       Policy/Restriction of the              Policy/Restriction of the             Proposed Policy/Restriction of
             Acquired Fund                         Acquiring Fund                         the Acquiring Fund
- --------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                                      <C>
INVESTMENTS IN
SECURITIES OF ISSUERS IN
OPERATION FOR LESS THAN
THREE YEARS.                                                                    Non-fundamental
                                       None.                                    The Fund may not invest in
None.                                                                           securities of issuers which, with their
                                                                                predecessors, have a record of less
                                                                                than three years continuous
                                                                                operations, except if more than 5%
                                                                                of the Fund's total assets would be
                                                                                invested in such securities (this
                                                                                restriction shall not apply to
                                                                                mortgage-backed securities, asset-
                                                                                backed securities or obligations
                                                                                issued or guaranteed by the U.S.
                                                                                Government, its agencies or
                                                                                instrumentalities).

- --------------------------------------------------------------------------------------------------------------------------
OWNERSHIP OF PORTFOLIO
SECURITIES BY OFFICERS
AND TRUSTEES.
Fundamental                            Fundamental                              Non-fundamental
The Fund may not hold securities of    The Fund may not hold securities of      The Fund may not hold securities of
any issuer if more than1/2of 1% of     any issuer if, to its knowledge, more    any issuer if more than 1/2 of 1% of
the securities of such issuer are      than 1/2 of 1% of the securities of such the securities of such issuer are
owned beneficially by one or more      issuer are owned beneficially by one     owned beneficially by one or more
officer or Trustee or by one or more   or more officer or Trustee or by one     officers or Trustees or by one or
partners of the underwriter of         or more partners of the investment       more members or partners of the
investment advisor if together they    adviser if together they own more        underwriter or investment advisor if
own more than 5% of the securities     than 5% of the securities of such        together they own more than 5% of
of such issuer.                        issuer.                                  the securities of such issuer.

- --------------------------------------------------------------------------------------------------------------------------
TRANSACTIONS WITH
CERTAIN PERSONS.
Fundamental                            Fundamental                              Non-fundamental
The Fund, subject to certain excep-    The Fund, subject to certain excep       The Fund may not buy from or sell to
tions, may not engage in securities    tions, may not engage in securities      any of its officers, directors,
transactions with its underwriter or   transactions with its underwriter or     employees, or its investment adviser
investment manager or with             investment manager or with officers,     or any or its officers, directors,
officers, trustees or firms (acting as trustees or firms (acting as             partners or employees, any securities
principals) with which any of the      principals) with which any of the        other than shares of the Fund's
foregoing are associated.              foregoing are associated.                common stock.

- --------------------------------------------------------------------------------------------------------------------------
SENIOR SECURITIES.
Fundamental.                           Fundamental.
The Fund may not issue senior          The Fund may not issue senior            Fundamental
securities.                            securities.                              The Fund may not issue senior
                                                                                securities to the extent such issuance
                                                                                would violate applicable law.

- --------------------------------------------------------------------------------------------------------------------------
</TABLE>     

                                       5
<PAGE>
 
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------------------------
       Policy/Restriction of the              Policy/Restriction of the             Proposed Policy/Restriction of
             Acquired Fund                         Acquiring Fund                         the Acquiring Fund
- --------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                                      <C>
PURCHASE OF WARRANTS.
None                                   None                                     Non-fundamental
                                                                                The Fund may not invest in warrants
                                                                                if, at the time of the acquisition, its
                                                                                investment in warrants, valued at the
                                                                                lower of cost or market, would
                                                                                exceed 5% of the Fund's total assets
                                                                                (included within such limitation, but
                                                                                not to exceed 2% of the Fund's total
                                                                                assets, are warrants which are not
                                                                                listed on the New York or American
                                                                                Stock Exchange or a major foreign
                                                                                exchange).
- --------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                       6
<PAGE>
 
   
            STATEMENT OF ADDITIONAL INFORMATION DATED APRIL 24, 1996
    

                          Acquisition of the Assets of
             Lord Abbett Florida Tax-Free Income Trust, a series of
                          Lord Abbett Securities Trust
                  The General Motors Building, 767 Fifth Avenue
                               New York, NY 10153

       

                    by and in exchange for Class C Shares of
                           Florida Series, a series of
                        Lord Abbett Tax-Free Income Trust
                  The General Motors Building, 767 Fifth Avenue
                               New York, NY 10153
         
   
     This Statement of Additional Information, relating specifically to the
proposed transfer of the assets of Lord Abbett Florida Tax-Free Income Trust
(the "Acquired Fund"), a series of Lord Abbett Securities Trust (the "Trust"),
to the Florida Series (the "Acquiring Fund"), a series of Lord Abbett Tax- Free
Income Trust (the "Income Trust") in exchange for Class C shares of the
Acquiring Fund and the assumption by the Acquiring Fund of the liabilities of
the Acquired Fund, consists of this page and the following described documents,
each of which accompanies this Statement of Additional Information and is
incorporated herein by reference:

     1. Statement of Additional Information of the Acquiring Fund dated March 1,
1996.
    

     2. Statement of Additional Information of the Securities Trust dated March
1, 1996, insofar as it relates to the Acquired Fund.

   
     3. The financial statements of the Acquiring Fund for the fiscal year ended
October 31, 1995, and the report thereon of Deloitte & Touche LLP, independent
public accountants, contained in the 1995 Annual Report of the Acquiring Fund.
    

     4. The financial statements of the Acquired Fund for the fiscal year ended
October 31, 1995, and the report thereon of Deloitte & Touche LLP, independent
public accountants, contained in the 1995 Annual Report of the Acquired Fund.

   
     The financial statements referred to above are incorporated herein in
reliance upon the authority of Deloitte & Touche LLP as experts in auditing and
accounting. This Statement of Additional Information is not a prospectus. A
Proxy Statement and Prospectus dated the date hereof relating to the
above-referenced matter may be obtained without charge by writing the Acquiring
Fund at the telephone number or address set forth above or by calling
1-800-874-3733. This Statement of Additional Information should be read in
conjunction with such Proxy Statement and Prospectus.
    



                                      B-1
<PAGE>
 
                                     PART C

       

Item 16.       Exhibits


   
          11.  Opinion of Debevoise & Plimpton as to the legality of securities
               being issued and Consent; filed herewith.

          17.  Prospectus and Statement of Additional Information of Lord Abbett
               Securities Trust, dated March 1, 1996, incorporated herein by
               reference to Post-Effective Amendment No. 10 to Registration
               Statement on Form N-1A of Lord Abbett Securities Trust (File Nos.
               33-58846 and 811-7538) filed on or about February 29, 1996.
    


                                      C-1
<PAGE>
 
                                   SIGNATURES

  *Post-effective  amendment  No. 1 to this  Registration  Statement has been
signed on behalf of the Registrant in the City of New York and State of New York
on the 24 day of April 1996,  who certifies that this  Post-Effective  Amendment
No. 1 meets all the requirements for  effectiveness  under paragraph (b) of Rule
485 under the Securities Act of 1933, as amended.

              
                     LORD ABBETT TAX-FREE INCOME TRUST



                             By:/s/ Ronald P. Lynch
                                    ---------------
                                    Ronald P. Lynch
                                    Chairman of the Board

            *Post-Effective Amendment No. 1 to this Registration Statement has
been signed by the following persons in the capacities indicated and on the
dates indicated.


   
         SIGNATURE                           TITLE                       DATE
         ---------                           -----                       ----

/s/ Ronald P. Lynch                Chairman of the Board
- -------------------------------    and Trustee                       4/24/96
    Ronald P. Lynch                

/s/ Robert S. Dow                  President and Trustee
- -------------------------------                                       4/24/96
    Robert S. Dow

/s/ John J. Gargana, Jr.           Vice President and
- -------------------------------    Chief Financial Officer            4/24/96
    John J. Gargana, Jr.           

/s/ E. Thayer Bigelow              Trustee
- -------------------------------                                       4/24/96
    E. Thayer Bigelow

/s/                                Trustee
- -------------------------------                                       ----------
    Stewart S. Dixon

/s/                                Trustee
- -------------------------------                                       ----------
    John C. Jansing

/s/ C. Alan MacDonald              Trustee
- -------------------------------                                       4/24/96
    C. Alan MacDonald

/s/                                Trustee
- -------------------------------                                       ----------
    Hansel B. Millican, Jr.

/s/ Thomas J. Neff                 Trustee
- -------------------------------                                       4/24/96
    Thomas J. Neff

/s/ E. Wayne Nordberg              Trustee
- -------------------------------                                       4/24/96
    E. Wayne Nordberg



                                      C-2
<PAGE>
 
                                  EXHIBIT INDEX

     The following exhibits are filed as a part of this Registration Statement
pursuant to General Instruction G of Form N-14.


Exhibit                                                            Page
Number                              Description                    Number
- ------                              -----------                   ------
(11)       Opinion of Debevoise & Plimpton as to legality of securities being
           issued and Consent.


                                      C-3


    

                                                                   Exhibit 11



                       [Debevoise & Plimpton Letterhead]


                                                                  April 24, 1996


Lord Abbett Tax-Free Income Trust
The General Motors Building
767 Fifth Avenue
New York, New York  10153


                       Lord Abbett Tax-Free Income Trust
                      Registration Statement on Form N-14
                      -----------------------------------

Ladies and Gentlemen:

     We have acted as counsel to Lord Abbett Tax-Free Income Trust (the
"Registrant"), a Massachusetts business trust, in connection with the
preparation and filing with the Securities and Exchange Commission under the
Securities Act of 1933, as amended, of a Registration Statement on Form N-14
(File No. 811-6418) and Post-Effective Amendment No. 1 thereto (as so amended,
the "Registration Statement"), re lating to the issuance of shares of beneficial
interest of the Florida Series (the "Acquiring Fund"), a series of the
Registrant.

     Such shares have been established and designated as the Class C shares (the
"Class C shares").  The Class C shares are to be issued to Lord Abbett Florida
Tax-Free Income Trust (the "Acquired Trust"), a series of Lord Abbett


<PAGE>
 
Lord Abbett Tax-Free Income Trust
Page 2


Securities Trust (the "Securities Trust"), a Delaware business trust, pursuant
to an Agreement and Plan of Reorganization (the "Acquired Trust Plan") between
the Registrant, on behalf of the Acquiring Fund, and the Securities Trust, on
behalf of the Acquired Trust, sub stantially in the form of Exhibit A included
in Part A of the Registration Statement.  Such issuance of the Class C shares is
to be made in connection with the acquisition by the Acquiring Fund of the
assets of, and the assumption by the Acquiring Fund of the liabilities of, the
Acquired Trust.

     In so acting, we have examined and relied upon the originals, or copies
certified or otherwise identified to our satisfaction, of such documents,
records, certificates and other instruments and have made such other investiga
tions as in our judgment are necessary or appropriate to en able us to render
the opinion expressed below.  We have not, however, undertaken any independent
investigation of any factual matter set forth in any of the foregoing.

     Based on the foregoing, we are of the following opinion:

     Assuming that the Acquired Trust and the Acquiring Fund duly execute and
deliver the Acquired Trust Plan, that the Acquired Trust Plan and the
reorganization provided for thereby are duly approved by the share holders of
the Acquired Trust, that the transactions contemplated by the Acquired Trust
Plan are duly con summated and that the amendments to the Declaration of Trust
of the Registrant substantially in the forms of Exhibits 1(c) and 1(d) to the
Registration Statement are duly approved and filed with the Secretary of State
of the Commonwealth of Massachusetts, the Class C shares issued pursuant to the
Acquired Trust Plan will be legally issued, fully paid and non-assessable.

     This opinion is limited solely to the federal law of the United States and
Chapter 182 of the General Laws of Massachusetts as in effect on the date hereof
and the rele vant facts that exist as of the date hereof.  Without limiting the
generality of the foregoing, we express no opinion concerning other laws of the
Commonwealth of Massachusetts, including the securities laws of such state, or
the laws of any other jurisdiction other than the United States.  No assurance
can be given that the law or facts will not change, and we have not undertaken
to advise you or
<PAGE>
 
Lord Abbett Tax-Free Income Trust
Page 3

any other person with respect to any event subsequent to the date hereof.

     We are delivering this opinion to you and, without our prior written
consent, no other persons are entitled to rely on this opinion.  We consent to
the filing of this opinion as an Exhibit to the Registration Statement.  In
giving such consent, we do not thereby concede that we are within the category
of persons whose consent is required under Section 7 of the Securities Act of
1933 or the Rules and Regulations of the Securities and Exchange Commission
thereunder.


                                             Very truly yours,

                                             /s/ Debevoise & Plimpton


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