NUVEEN TAX FREE UNIT TRUST SERIES 998
S-6, 1998-04-08
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<PAGE>
                                                    40 ACT FILE NO. 811-2271
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    FORM S-6
 
For  Registration  under  the  Securities  Act of  1933  of  Securities  of Unit
Investment Trusts Registered on
Form N-8B-2
 
<TABLE>
<S> <C>                 <C>
A.  Exact name of Trust: NUVEEN TAX-FREE UNIT TRUST, SERIES 998
 
B.  Name of Depositor:  JOHN NUVEEN & CO. INCORPORATED
 
C.  Complete address of Depositor's principal executive offices:
 
                        333 West Wacker Drive
                        Chicago, Illinois 60606
 
D.  Name and complete address of agents for service:
 
                        JOHN NUVEEN & CO. INCORPORATED
                        Attn: Gifford R. Zimmerman
                        333 West Wacker Drive
                        Chicago, Illinois 60606
 
                        CHAPMAN AND CUTLER
                        Attn: Eric F. Fess
                        111 West Monroe Street
                        Chicago, Illinois 60603
 
It is proposed that this filing will become effective (check appropriate box)
 
/ / immediately upon filing pursuant to paragraph (b)
 
/ / on April 8, 1998 pursuant to paragraph (b) of rule 485
 
/ / 60 days after filing pursuant to paragraph (a)
 
/ / on April 8, 1998 pursuant to paragraph (a) of rule 485 or 486
 
E.  Title of  securities  being registered:  Units  of fractional  undivided  beneficial
    interest.
 
F.  Approximate  date of proposed sale  to the public: As  soon as practicable after the
    effective date of the Registration Statement.
 
/ / Check box if  it is proposed  that this filing  will become effective  on (date)  at
    (time) pursuant to Rule 487.
</TABLE>
 
- --------------------------------------------------------------------------------
 
THE  REGISTRANT HEREBY AMENDS THIS REGISTRATION  STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL  FILE
A  FURTHER AMENDMENT WHICH SPECIFICALLY  STATES THAT THIS REGISTRATION STATEMENT
SHALL THEREAFTER  BECOME  EFFECTIVE  IN  ACCORDANCE WITH  SECTION  8(A)  OF  THE
SECURITIES  ACT  OF  1933  OR  UNTIL  THE  REGISTRATION  STATEMENT  SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE  COMMISSION, ACTING PURSUANT TO SAID SECTION  8(A)
MAY DETERMINE.
<PAGE>
                     NUVEEN TAX-FREE UNIT TRUST, SERIES 998
 
                             CROSS-REFERENCE SHEET
 
                    PURSUANT TO RULE 404(C) OF REGULATION C
                        UNDER THE SECURITIES ACT OF 1933
 
                (FORM N-8B-2 ITEMS REQUIRED BY INSTRUCTION 1 AS
                           TO PROSPECTUS ON FORM S-6)
 
<TABLE>
<C>  <S>  <C>                                          <C> <C>
FORM N-8B-2                                                FORM S-6
ITEM NUMBER                                                HEADING IN PROSPECTUS
          I. ORGANIZATION AND GENERAL INFORMATION
 1.  (a)  Name of trust                                 )  Prospectus Part A -- Cover Page
     (b)  Title of securities issued                    )
 2.  Name and address of Depositor                      )  Information About the Sponsor
 3.  Name and address of Trustee                        )  Information About the Trustee
 4.  Name and address of principal Underwriter          )  Information About the Sponsor
 5.  Organization of trust                              )  What Is The Nuveen Tax-Free Unit Trust?
 6.  Execution and termination of Trust Agreement       )  What Is The Nuveen Tax-Free Unit Trust?
                                                        )  Information About The Trustee
                                                        )  Other Information
 7.  Changes of Name                                    )  *
 8.  Fiscal Year                                        )
 9.  Litigation                                         )
 
          II. GENERAL DESCRIPTION OF THE TRUST AND SECURITIES OF THE TRUST
10.  General Information regarding trust's securities   )  Summary of Portfolios
                                                        )  Why and How are the Bonds Insured?
                                                        )  When Are Distributions Made to Unitholders?
                                                        )  Ownership and Transfer of Units
                                                        )  How Units May Be Redeemed Without Charge?
                                                        )  How Bonds May Be Removed From The Trusts?
                                                        )  Information About the Trustee
                                                        )  Information About the Sponsor
                                                        )  Other Information
                                                        )  What Is The Tax Status of Unitholders?
11.  Type of securities comprising units                )  What Is The Nuveen Tax-Free Unit Trust?
                                                        )  Summary of Portfolios
                                                        )  Composition of Trusts
                                                        )  What Are The Objectives Of The Trusts?
                                                        )  Why and How are the Bonds Insured?
12.  Certain information regarding                      )  *
     periodic payment certificates                      )
13.  (a)  Load, fees, expenses, etc.                    )  Part A -- Essential Information
                                                        )  How Is The Public Offering Price Determined?
                                                        )  Market For Units
                                                        )  What Is Accrued Interest?
                                                        )  What Are Estimated Long Term Return
                                                        )  And Estimated Current Return?
                                                        )  How Was The Price Of The Bonds
                                                        )  Determined At The Date of Deposit?
                                                        )  What Are Normal Trust Operating Expenses?
                                                        )  When Are Distributions Made To Unitholders?
                                                        )  Summary Of Portfolios
                                                        )  How Detailed Are Reports To Unitholders?
     (b)  Certain information regarding                 )  *
          periodic payment certificates                 )
     (c)  Certain percentages                           )  How Is The Public Offering Price Determined?
</TABLE>
<PAGE>
<TABLE>
<C>  <S>  <C>                                          <C> <C>
                                                        )  Market For Units
                                                        )  What Are Estimated Long Term Return
                                                        )  And Estimated Current Return?
                                                        )  How Was The Price Of The Bonds
                                                        )  Determined At The Date Of Deposit?
                                                        )  What Is Accrued Interest?
     (d)  Certain other fees, etc. payable by holders   )  How Was The Price Of The Bonds Determined
                                                        )  At The Date Of Deposit?
                                                        )  What Are Normal Trust Operating Expenses?
                                                        )  Ownership And Transfer Of Units
     (e)  Certain profits receivable by depositor,      )  Composition Of Trusts
          principal underwriter, trustee or             )
          affiliated persons                            )
                                                        )  How Units May Be Purchased By The Sponsor
 
     (f)  Ratio of annual charges to income             )  *
14.  Issuance of trust's securities                     )  Summary of Portfolios
                                                        )  When Are Distributions Made To Unitholders?
                                                        )  Ownership and Transfer of Units
                                                        )  How Units May Be Redeemed Without Charge
15.  Receipt and handling of payments                   )  *
     from purchasers                                    )
16.  Acquisition and Disposition of                     )  What Is The Nuveen Tax-Free Unit Trust?
     Underlying Securities                              )
                                                        )  Summary of Portfolios
                                                        )  Composition of Trusts
                                                        )  Why and How are the Bonds Insured?
                                                        )  How Units May Be Redeemed Without Charge
                                                        )  How Bonds May Be Removed From The Trusts
                                                        )  Other Information
17.  Withdrawal or redemption                           )  Market For Units
                                                        )  How Units May Be Redeemed Without Charge
                                                        )  How Units May Be Purchased By The Sponsor
18.  (a)  Receipt and disposition of income             )  Summary of Portfolios
                                                        )  When Are Distributions Made To Unitholders?
                                                        )  How Detailed Are Reports To Unitholders?
     (b)  Reinvestment of distributions                 )  Accumulation Plan
     (c)  Reserves or special funds                     )  Summary of Portfolios
                                                        )  When Are Distributions Made To Unitholders?
     (d)  Schedule of distributions                     )  *
19.  Records, accounts and reports                      )  When Are Distributions Made To Unitholders?
                                                        )  How Detailed Are Reports To Unitholders?
20.  Certain miscellaneous provisions of                )  Information About the Trustee
     Trust Agreement                                    )
                                                        )  Information About the Sponsor
                                                        )  Other Information
21.  Loans to security holders                          )  *
22.  Limitations on liability                           )  Summary of Portfolios
                                                        )  Composition of Trusts
                                                        )  Information About The Trustee
23.  Bond arrangements                                  )  *
24.  Other material provisions of Trust Agreement.      )  *
 
          III. ORGANIZATION, PERSONNEL AND AFFILIATED PERSONS OF DEPOSITOR
25.  Organization of Depositor                          )  Information About the Sponsor
26.  Fees received by Depositor                         )  *
</TABLE>
<PAGE>
<TABLE>
<C>  <S>  <C>                                          <C> <C>
27.  Business of Depositor                              )  Information About the Sponsor
28.  Certain information as to officials                )  *
     and affiliated persons of Depositor                )
29.  Voting Securities of Depositor                     )  Information About the Sponsor
30.  Persons controlling Depositor                      )
31.  Payments by Depositor for certain                  )
     services rendered to trust                         )
32.  Payments by Depositor for certain                  )  *
     other services rendered to trust                   )
33.  Remuneration of employees of Depositor             )
     for certain services rendered to trust             )
34.  Remuneration of other persons for                  )
     certain services rendered to trust                 )
 
          IV. DISTRIBUTION AND REDEMPTION OF SECURITIES
35.  Distribution of trust's securities by states       )  *
36.  Suspension of sales of trust's securities          )
37.  Revocation of authority to distribute              )
38.  (a)  Method of distribution                        )
     (b)  Underwriting agreements                       )  How Units of The Trusts Are
                                                        )  Distributed To The Public
     (c)  Selling agreement                             )
39.  (a)  Organization of principal underwriter         )  Information About The Sponsor
     (b)  NASD membership of principal underwriter      )
40.  Certain fees received by principal underwriter     )  *
41.  (a)  Business of principal underwriter             )
     (b)  Branch offices of principal underwriter       )  *
     (c)  Salesmen of principal underwriter             )
42.  Ownership of trust's securities by                 )  *
     certain persons                                    )
43.  Certain brokerage commissions received             )  *
     by principal underwriter                           )
44.  (a)  Method of valuation                           )  Part A -- Essential Information
                                                        )  How Is The Public Offering Price Determined?
                                                        )  How Was The Price Of The Bonds
                                                        )  Determined At The Date of Deposit?
                                                        )  What Are Normal Trust Operating Expenses?
     (b)  Schedule as to offering price                 )  *
     (c)  Variation in offering price to                )  How Is the Public Offering Price
          certain persons                               )  Determined?
                                                        )  What Is Accrued Interest?
                                                        )  How Was The Price Of The Bonds
                                                        )  Determined At The Date of Deposit?
45.  Suspension of redemption rights                    )  *
46.  (a)  Redemption valuation                          )  Unit Value and Evaluation
                                                        )  How Units May Be Redeemed Without Charge
                                                        )  How Units May Be Purchased By The Sponsor
     (b)  Schedule as to redemption price               )  *
47.  Maintenance of position in underlying              )  How Is the Public Offering Price
     securities                                         )  Determined?
                                                        )  How Units May Be Purchased By The Sponsor
 
          V. INFORMATION CONCERNING THE TRUSTEE OR CUSTODIAN
</TABLE>
<PAGE>
<TABLE>
<C>  <S>  <C>                                          <C> <C>
48.  Organization and regulation of Trustee             )  Information About The Trustee
49.  Fees and expenses of Trustee                       )  Part A -- Essential Information
                                                        )  What Are Normal Trust Operating Expenses?
50.  Trustee's lien                                     )  What Are Normal Trust Operating Expenses?
                                                        )  When Are Distributions Made To Unitholders?
 
          VI. INFORMATION CONCERNING INSURANCE OF HOLDERS OF SECURITIES
51.  Insurance of holders of trust's securities         )  *
 
          VII. POLICY OF REGISTRANT
52.  (a)  Provisions of trust agreement with            )  What Are Normal Trust Operating
          respect to selection or elimination           )  Expenses?
          of underlying securities                      )
                                                        )  How Units May Be Redeemed Without Charge
                                                        )  How Bonds May Be Removed From The Trusts
     (b)  Transactions involving elimination            )  *
          of underlying securities                      )
     (c)  Policy regarding substitution or              )  Summary of Portfolios
          elimination of underlying securities          )
                                                        )  Composition of Trusts
                                                        )  How Bonds May Be Removed From The Trusts
     (d)  Fundamental policy not otherwise covered      )  *
53.  Tax status of trust                                )  What Is The Tax Status Of Unitholders?
 
          VIII. FINANCIAL AND STATISTICAL INFORMATION
54.  Trust's securities during last ten years           )  *
55.                                                     )
56.  Certain information regarding                      )  *
     periodic payment certificate                       )
57.                                                     )
58.                                                     )
</TABLE>
 
- ---------
 
* Inapplicable, omitted, answer negative or not required.
<PAGE>
                ------------------------------------------------
 
                   PRELIMINARY PROSPECTUS DATED APRIL 8, 1998
                ------------------------------------------------
 
                           NUVEEN TAX-FREE UNIT TRUST
 
- --------------------------------------------------------------------------------
 
                                                             SERIES 998
                                                       (A UNIT INVESTMENT TRUST)
- --------------------------------------------------------------------------------
 
The attached final Prospectus for a prior Series is hereby used as a preliminary
Prospectus  for the above-stated Series. The narrative information and structure
of the attached final Prospectus will be  substantially the same as that of  the
final  Prospectus  for this  Series. Although  the attached  Prospectus includes
trusts as indicated therein,  the specific trusts included  in this Series  when
deposited  may differ from  such trusts. Information with  respect to the actual
trusts to  be  included,  pricing,  the  number  of  Units,  dates  and  summary
information  regarding the characteristics of securities to be deposited in this
Series is not now available and will be different since each Series has a unique
Portfolio. Accordingly  the  information contained  herein  with regard  to  the
previous  Series  should  be  considered  as  being  included  for informational
purposes only.  Ratings of  the securities  in this  Series are  expected to  be
comparable to those of the securities deposited in the previous Series. However,
the  Estimated Current Return for this Series  will depend on the interest rates
and offering prices  of the securities  in this Series  and may vary  materially
from that of the previous Series.
 
A  REGISTRATION STATEMENT RELATING  TO THE UNITS  OF THIS SERIES  HAS BEEN FILED
WITH THE SECURITIES AND  EXCHANGE COMMISSION BUT HAS  NOT YET BECOME  EFFECTIVE.
INFORMATION  CONTAINED HEREIN IS SUBJECT TO  COMPLETION OR AMENDMENT. SUCH UNITS
MAY NOT  BE SOLD  NOR  MAY OFFERS  TO BUY  BE  ACCEPTED PRIOR  TO THE  TIME  THE
REGISTRATION  STATEMENT BECOMES EFFECTIVE. THIS  PROSPECTUS SHALL NOT CONSTITUTE
AN OFFER TO SELL OR THE SOLICITATION OF  AN OFFER TO BUY NOR SHALL THERE BE  ANY
SALE  OF THE UNITS IN ANY STATE IN  WHICH SUCH OFFER, SOLICITATION OR SALE WOULD
BE UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS  OF
ANY SUCH STATE.
 
(Incorporated  herein by reference is the  final prospectus from Nuveen Tax Free
Unit Trust, Series 993 (Registration No.  333-47431) as filed on April 8,  1998,
which  shall be used as  a preliminary prospectus for  the current series of the
Fund.)
<PAGE>
                       CONTENTS OF REGISTRATION STATEMENT
 
A.  BONDING ARRANGEMENTS OF DEPOSITOR:
 
    The Depositor has obtained the following Stockbrokers Blanket Bonds for  its
officers, directors and employees:
 
<TABLE>
<S>                                                                       <C>
    INSURER/POLICY NO.                                                      AMOUNT
    Reliance Insurance Company                                            $26,000,000
    B 262 6895
</TABLE>
 
B.  THIS REGISTRATION STATEMENT COMPRISES THE FOLLOWING PAPERS AND DOCUMENTS:
 
                                The facing sheet
 
                                 The Prospectus
 
                                 The signatures
 
                              Consents of Counsel
 
                                    Exhibits
 
C.  EXPLANATORY NOTE:
 
    The Registration Statement will contain multiple separate prospectuses. Each
prospectus  will relate to an individual  unit investment trust and will consist
of a Part A,  a Part B  and an Information Supplement.  Each prospectus will  be
identical  with the exception  of the respective  Part A which  will contain the
financial information specific to such underlying unit investment trust.
 
D.  UNDERTAKINGS:
 
    1.  With  the exception of  the information included  in the state  specific
appendices  to the  Information Supplement, which  will vary  depending upon the
make-up of a  Fund or  updated to  reflect current  events, any  amendment to  a
Fund's  Information Supplement will be subject to the review of the staff of the
Securities and Exchange Commission prior to distribution; and
 
    2.  The  Information Supplement to  the Trust will  not include third  party
financial information.
<PAGE>
                                   SIGNATURES
 
    Pursuant  to the requirements of the Securities Act of 1933, the Registrant,
Nuveen Tax-Free  Unit  Trust,  Series  998 has  duly  caused  this  Registration
Statement  to  be  signed  on  its  behalf  by  the  undersigned  thereunto duly
authorized in the City of Chicago and State of Illinois on April 8, 1998.
 
                                          NUVEEN TAX-FREE UNIT TRUST, SERIES 998
                                                             (Registrant)
 
                                          By JOHN NUVEEN & CO. INCORPORATED
                                                             (Depositor)
 
                                          By:  Larry Woods Martin
                                          --------------------------------------
                                                             Vice President
 
                                          Attest:  Karen L. Healy
                                          --------------------------------------
                                                             Assistant Secretary
 
    Pursuant  to  the  requirements  of   the  Securities  Act  of  1933,   this
Registration  Statement has  been signed below  by the following  persons in the
capacities and on the dates indicated:
 
<TABLE>
<CAPTION>
          SIGNATURE                        TITLE*                 DATE
<S>                            <C>                              <C>        <C>
Timothy T. Schwertfeger        Chairman, Board of Directors         )
                               Chief Executive Officer and          )
                               Director                             )
                                                                    )
Anthony T. Dean                President, Chief Operating           )
                               Officer and Director                 )           Larry Woods Martin
                                                                    )           Attorney-In-Fact**
                                                                    )
John P. Amboian                Chief Financial Officer and          )              April 8, 1998
                               Executive Vice President             )
                                                                    )
                                                                    )
O. Walter Renfftlen            Vice President and Controller        )
                               (Principal Accounting Officer)       )
                                                                    )
                                                                    )
</TABLE>
 
- --------------
 
* The  titles  of the  persons  named herein  represent  their capacity  in  and
relationship to John Nuveen & Co. Incorporated, the Depositor.
 
**  The powers of attorney were filed on Form SE for Messrs. Renfftlen, Dean and
Schwertfeger with the  Amendment to the  Registration Statement on  Form S-6  of
Nuveen  Tax-Exempt  Unit Trust,  Series 671  (File No.  33-49175). The  Power of
Attorney for Messr.  Amboian was filed  with the Amendment  to the  Registration
Statement  on Form  S-6 of  Nuveen Tax-Exempt Unit  Trust, Series  823 (File No.
33-62325).
<PAGE>
                         CONSENT OF CHAPMAN AND CUTLER
 
    The consent of Chapman and Cutler to  the use of its name in the  Prospectus
included in the Registration Statement will be filed by amendment.
 
                            CONSENT OF STATE COUNSEL
 
    The consents of special counsel to the Fund for state tax matters to the use
of  their names in the Prospectus included in the Registration Statement will be
filed by amendment.
 
                         CONSENT OF STANDARD & POOR'S,
                    A DIVISION OF THE MCGRAW-HILL COMPANIES
 
    The consent of Standard & Poor's,  a Division of The McGraw-Hill  Companies,
to  the use of its name in the Prospectus included in the Registration Statement
will be filed by amendment.
 
                    CONSENT OF KENNY S&P EVALUATION SERVICES
 
    The consent of Kenny S&P Evaluation Services  to the use of its name in  the
Prospectus included in the Registration Statement will be filed by amendment.
 
                      CONSENT OF CARTER, LEDYARD & MILBURN
 
    The  consent of  Carter, Ledyard  & Milburn to  the use  of its  name in the
Prospectus included in the Registration Statement will be filed by amendment.
 
                         CONSENT OF ARTHUR ANDERSEN LLP
 
    The consent of  Arthur Andersen  LLP to  the use of  its report  and to  the
reference  to such firm in the Prospectus included in the Registration Statement
will be filed by amendment.

<PAGE>
                                LIST OF EXHIBITS
 
<TABLE>
<S>         <C>
1.1(a)      Copy  of Standard Terms and Conditions of Trust between John Nuveen & Co. Incorporated,
            Depositor, and  The Chase  Manhattan Bank,  Trustee.  Filed as  Exhibit 1.1(A)  to  the
            Sponsor's  Registration Statement filed with respect  to Series 823 (File No. 33-62325)
            and is incorporated herein by reference.
1.1(b)      Trust Indenture and Agreement (to be supplied by amendment).
1.2*        Copy of Certificate of  Incorporation, as amended, of  John Nuveen & Co.  Incorporated,
            Depositor.
1.3**       Copy  of amendment of Certificate  of Incorporation changing name  of Depositor to John
            Nuveen & Co. Incorporated.
2.1         Copy of Certificate of Ownership (included in Exhibit 1.1(A) and Incorporated herein by
            reference).
3.1         Opinion of counsel as  to legality of  securities being registered  (to be supplied  by
            amendment).
3.2         Opinion  of counsel as to Federal income  tax status of securities being registered (to
            be supplied by amendment).
3.3         Consents of special state  counsel to the Fund  for state tax matters  to use of  their
            names in the Prospectus (to be supplied by amendment).
4.1         Consent of Standard + Poor's Corporation (to be supplied by amendment).
4.2         Consent of Kenny S+P Evaluation Services (to be supplied by amendment).
4.3         Consent of Carter, Ledyard & Milburn (to be supplied by amendment).
6.1         List of Directors and Officers of Depositor and other related information (incorporated
            by  reference to Form S-6 [File  No. 33-62325] filed on September  7, 1995 on behalf of
            Nuveen Tax-Exempt Unit Trust, Series 823).
</TABLE>
 
- --------------
 
   * Incorporated  by reference  to Form  N-8B-2 (File  No. 811-1547)  filed  on
behalf of Nuveen Tax-Exempt Unit Trust, Series 16.
 
   **  Incorporated by  reference to  Form N-8B-2  (File No.  811-2198) filed on
behalf of Nuveen Tax-Exempt Unit Trust, Series 37.


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