SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-K
                       FOR ANNUAL AND TRANSITION REPORTS
                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

(Mark One)
[X]           ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

          For the fiscal year ended December 31, 1999

                                       OR

[  ]        TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE
                             SECURITIES EXCHANGE ACT OF 1934

For the transition period from ___________  to ______________


Commission file numbers: 33-41055, 33-43576, 33-62180, 33-77802, 33-84834,
                         33-97664, 33-99328, 333-38803


                          Citibank (South Dakota), N.A.
                                  on behalf of
                       Citibank Credit Card Master Trust I
          (Issuer in respect of the Citibank Credit Card Master Trust I
      8.350% Class B Credit Card Participation Certificates, Series 1991-6
       5.95% Class A Credit Card Participation Certificates, Series 1993-2
       6.15% Class B Credit Card Participation Certificates, Series 1993-2
       5.50% Class A Credit Card Participation Certificates, Series 1993-3
       5.70% Class B Credit Card Participation Certificates, Series 1993-3
       7.25% Class A Credit Card Participation Certificates, Series 1994-2
       7.50% Class B Credit Card Participation Certificates, Series 1994-2
       6.80% Class A Credit Card Participation Certificates, Series 1994-3
       7.00% Class B Credit Card Participation Certificates, Series 1994-3
       8.25% Class A Credit Card Participation Certificates, Series 1994-4
       8.25% Class A Credit Card Participation Certificates, Series 1995-1
       8.45% Class B Credit Card Participation Certificates, Series 1995-1
       7.85% Class A Credit Card Participation Certificates, Series 1995-3
       6.55% Class A Credit Card Participation Certificates, Series 1995-9
       6.65% Class B Credit Card Participation Certificates, Series 1995-9
      5.90% Class A Credit Card Participation Certificates, Series 1995-10
      6.05% Class B Credit Card Participation Certificates, Series 1995-10
    Zero Coupon Class A Credit Card Participation Certificates, Series 1996-1
    Zero Coupon Class B Credit Card Participation Certificates, Series 1996-1
   Floating Rate Class A Credit Card Participation Certificates, Series 1996-5
   Floating Rate Class B Credit Card Participation Certificates, Series 1996-5
   Floating Rate Class A Credit Card Participation Certificates, Series 1996-6
   Floating Rate Class B Credit Card Participation Certificates, Series 1996-6
       6.55% Class A Credit Card Participation Certificates, Series 1997-2
       6.70% Class B Credit Card Participation Certificates, Series 1997-2
      6.839% Class A Credit Card Participation Certificates, Series 1997-3
      6.989% Class B Credit Card Participation Certificates, Series 1997-3
   Floating Rate Class A Credit Card Participation Certificates, Series 1997-4
   Floating Rate Class B Credit Card Participation Certificates, Series 1997-4
    Zero Coupon Class A Credit Card Participation Certificates, Series 1997-6
    Zero Coupon Class B Credit Card Participation Certificates, Series 1997-6

                                                       [cover page 1 of 2 pages]


<PAGE>

       6.35% Class A Credit Card Participation Certificates, Series 1997-7
       6.45% Class B Credit Card Participation Certificates, Series 1997-7
   Floating Rate Class A Credit Card Participation Certificates, Series 1997-8
  Floating Rate Class A Credit Card Participation Certificates, Series 1997-10
  Floating Rate Class B Credit Card Participation Certificates, Series 1997-10
     5.750% Class A Credit Card Participation Certificates, Series 1998-1
     5.875% Class B Credit Card Participation Certificates, Series 1998-1
      6.05% Class A Credit Card Participation Certificates, Series 1998-2
      6.20% Class B Credit Card Participation Certificates, Series 1998-2
      5.80% Class A Credit Card Participation Certificates, Series 1998-3
      5.95% Class B Credit Card Participation Certificates, Series 1998-3
      5.85% Class A Credit Card Participation Certificates, Series 1998-6
      6.00% Class B Credit Card Participation Certificates, Series 1998-6
  Floating Rate Class A Credit Card Participation Certificates, Series 1998-7
  Floating Rate Class B Credit Card Participation Certificates, Series 1998-7
       5.30% Class A Credit Card Participation Certificates, Series 1998-9
      5.55% Class B Credit Card Participation Certificates, Series 1998-9
       5.50% Class A Credit Card Participation Certificates, Series 1999-1
       5.75% Class B Credit Card Participation Certificates, Series 1999-1
      5.875% Class A Credit Card Participation Certificates, Series 1999-2
      6.150% Class B Credit Card Participation Certificates, Series 1999-2
   Floating Rate Class A Credit Card Participation Certificates, Series 1999-3
   Floating Rate Class B Credit Card Participation Certificates, Series 1999-3
       6.10% Class A Credit Card Participation Certificates, Series 1999-5
       6.30% Class B Credit Card Participation Certificates, Series 1999-5
       6.65% Class A Credit Card Participation Certificates, Series 1999-7
       6.90% Class B Credit Card Participation Certificates, Series 1999-7
                       (collectively, the "Certificates"))
                       -----------------------------------
             (Exact name of registrant as specified in its charter)

     United States of America                         46-0358360
     ------------------------                         ----------
(State or other jurisdiction of           (I.R.S. Employer Identification No.)
  incorporation or organization)

     701 East 60th Street, North
     Sioux Falls, South Dakota                           57117
     -------------------------                           -----
(Address of principal executive offices)               (Zip Code)

Registrant's telephone number, including area code:  (605) 331-2626

Securities registered pursuant to Section 12(b) of the Act:

         NONE

Securities registered pursuant to Section 12(g) of the Act:

         Forms 8-A were filed with the Securities and Exchange  Commission  (the
"Commission")  registering each Series of the  Certificates  pursuant to Section
12(g) of the Securities Exchange Act of 1934 (the "Act").

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days.

         Yes   X  .*   No      .
             -----        -----

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]


State the aggregate market value of the voting and non-voting common equity held
by  non-affiliates  of the  registrant.  The  aggregate  market  value  shall be
computed by reference to the price at which the common  equity was sold,  or the
average bid and asked price of such common equity, as of a specified date within
60 days prior to the date of filing.  (See  definition of affiliate in Rule 405,
17 C.F.R. 230.405):

         NOT APPLICABLE.
                                                       [cover page 2 of 2 pages]

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

     *On April 28,  1989,  the  registrant  was issued a  no-action  letter (the
"No-Action   Letter")  by  the  Commission   with  respect  to  certain  of  the
registrant's  reporting requirements pursuant to Section 13 or 15(d) of the Act.
This Form 10-K has been prepared in accordance  with the terms of such No-Action
Letter.


<PAGE>


                                     PART I
                                     ------

Item 1. Business.

      Omitted pursuant to the No-Action Letter.

Item 2. Properties.

      Pursuant  to Section  3.06 of the  Pooling and  Servicing  Agreement  (the
"Pooling  Agreement")  dated as of May 29, 1991 relating to the Citibank  Credit
Card Master Trust I (the "Trust") among Citibank (South Dakota),  N.A. ("CBSD"),
Citibank (Nevada), National Association ("CBNV", CBSD and CBNV collectively, the
"Banks") and Bankers Trust  Company,  as trustee (the  "Trustee"),  KPMG LLP has
performed  certain   procedures  in  connection  with  the  Monthly   Servicer's
Certificates (the "Monthly Certificates") for the months of January 1999 through
December  1999. The Monthly  Certificates  contain  information  relating to the
receivables  (the  "Receivables")  and the accounts  from which the  Receivables
arise (the  "Accounts")  and are prepared by the  Servicer and  delivered to the
Trustee pursuant to Section 3.04(b) of the Pooling Agreement. The reports issued
by KPMG LLP in connection with the servicing activities of CBSD, as servicer (in
such capacity, the "Servicer"), are attached hereto as Exhibit 99.1. The Monthly
Certificates containing information relating to the Receivables and the Accounts
for  the  Due  Periods  ending  in  January  1999  through   December  1999  are
incorporated  by reference  from the  registrant's  Current  Reports on Form 8-K
filed with the Commission on February 9, 1999,  March 10, 1999,  April 19, 1999,
May 20, 1999, June 14, 1999, July 19, 1999, August 19, 1999, September 16, 1999,
October 20, 1999,  November  26,  1999,  December 10, 1999 and January 13, 2000,
respectively.  In addition,  the  registrant's  Current Report on Form 8-K filed
with the Commission on January 27, 2000 containing certain financial information
as of  December  31,  1999 with  regard to the Trust,  the  Receivables  and the
Accounts is incorporated by reference.

Item 3. Legal Proceedings.

     The registrant knows of no material pending legal proceedings involving the
Trust,  CBSD, CBNV or the Trustee (in its capacity as such),  other than routine
litigation  incidental to the business of the Trust,  CBSD,  CBNV or the Trustee
(in its capacity as such).

Item 4. Submission of Matters to a Vote of Security Holders.

      NONE.

                                     PART II
                                     -------

Item 5. Market for Registrant's Common Equity and Related Stockholder Matters.

     To the best knowledge of the  registrant,  there is no  established  public
trading market for the Certificates.

     Each  class of  Certificates  is  represented  by one or more  certificates
registered  in the name of Cede & Co.  ("Cede"),  the nominee of The  Depository
Trust Company ("DTC").

Item 6. Selected Financial Data.

     Omitted pursuant to the No-Action Letter.

Item 7. Management's  Discussion and Analysis of Financial Condition and Results
of Operation.

     Omitted pursuant to the No-Action Letter.


                                       3


<PAGE>


Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

     Omitted pursuant to the No-Action Letter.

Item 8. Financial Statements and Supplementary Data.

     Omitted pursuant to the No-Action Letter.

Item  9.  Changes  in and  Disagreements  with  Accountants  on  Accounting  and
Financial Disclosure.

     NONE.

                                    PART III
                                    --------

Item 10. Directors and Executive Officers of the Registrant.

     Omitted pursuant to the No-Action Letter.

Item 11. Executive Compensation.

     Omitted pursuant to the No-Action Letter.

Item 12. Security Ownership of Certain Beneficial Owners and Management.

     (a) Each class of Certificates  is represented by one or more  certificates
registered in the name of Cede,  the nominee of DTC, and an investor  holding an
interest in the Trust is not entitled to receive a certificate representing such
interest  except in limited  circumstances  set forth in the Pooling  Agreement.
Accordingly,  Cede is the sole holder of record of Certificates,  which it holds
on behalf of brokers,  dealers,  banks, and other direct participants in the DTC
system. Such direct participants may hold Certificates for their own accounts or
for the accounts of their customers. The name and address of Cede is Cede & Co.,
c/o The Depository Trust Company, 55 Water Street, New York, NY 10041.

     (b) Omitted pursuant to the No-Action Letter.

     (c) Omitted pursuant to the No-Action Letter.

Item 13. Certain Relationships and Related Transactions.

     There have not been, and there are not currently proposed,  any transaction
or series of  transactions,  to which  either  the Trust,  CBSD,  as a seller or
servicer,  CBNV, as a seller, or the Trustee, on behalf of the Trust, is a party
with any  Certificateholder  who owns of record or  beneficially  more than five
percent of the Certificates.


                                       4


<PAGE>

                                     PART IV
                                     -------


Item 14. Exhibits, Financial Statement Schedules, and Reports on Form 8-K.

 (a)  24.1  Power of Attorney of Mr.  Paladino as a Director of Citibank  (South
            Dakota),  N.A. is incorporated by reference from Exhibit 25.1 of the
            registrant's Registration Statement on Form S-1 (File No. 33-33860).
            Powers of  Attorney  of Messrs.  Greenfield,  Johnson  and Bender as
            Directors  of Citibank  (South  Dakota),  N.A. are  incorporated  by
            reference  from  Exhibit  25.1  of  the  registrant's   Registration
            Statement on Form S-1 (File No. 33-28213).

      99.1  Reports on the activities of CBSD, as Servicer, prepared by KPMG LLP
            pursuant  to Section  3.06 of the  Pooling  Agreement  are  attached
            hereto as Exhibit 99.1.

      99.2  The  Monthly  Certificates  containing  information  relating to the
            Receivables  and the Accounts for the Due Periods  ending in January
            1999 through  December 1999 are  incorporated  by reference from the
            registrant's  Current  Reports on Form 8-K filed with the Commission
            on February 9, 1999,  March 10, 1999,  April 19, 1999, May 20, 1999,
            June 14, 1999, July 19, 1999,  August 19, 1999,  September 16, 1999,
            October 20, 1999,  November 26, 1999,  December 10, 1999 and January
            13, 2000, respectively.

      99.3  The  registrant's   Current  Report  on  Form  8-K  filed  with  the
            Commission  on  January  27,  2000  containing   certain   financial
            information  as of December  31, 1999 with regard to the Trust,  the
            Receivables and the Accounts is incorporated by reference.


 (b)  Omitted pursuant to the No-Action Letter.


 (c)  Omitted pursuant to the No-Action Letter.


 (d)  Omitted pursuant to the No-Action Letter.


                                       5


<PAGE>

                                   SIGNATURES
                                   ----------

     Pursuant  to the  requirements  of  Section  13 or 15(d) of the  Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.

                                  CITIBANK (SOUTH DAKOTA), N.A.,
                                  as Servicer
                                  (Registrant)


                                  By: /s/ Eugene D. Rowenhorst
                                      ------------------------
                                          Eugene D. Rowenhorst
                                          Senior Vice President


Dated:  March 28, 2000


     Pursuant to the  requirements of the Securities  Exchange Act of 1934, this
report  has  been  signed  below  by the  following  persons  on  behalf  of the
registrant on March 28, 2000 in the capacities indicated.


                               /s/ Kendall E. Stork
                               ------------------------
                               Kendall E. Stork
                               President, Chief Executive Officer and a Director
                               (Principal Executive Officer)


                               /s/ Eugene D. Rowenhorst
                               ------------------------
                               Eugene D. Rowenhorst
                               Chief Financial Officer and a Director
                               (Principal Financial Officer and
                               Principal Accounting Officer)


                               ------------------------
                               James R. Stojak
                               Director


                                          *
                               ------------------------
                               Joachim M. Paladino
                               Director


                                          *
                               ------------------------
                               Russell R. Greenfield
                               Director


                                       6


<PAGE>

                                          *
                               ------------------------
                               Jerry W. Johnson
                               Director


                                          *
                               ------------------------
                               Donald Bender
                               Director


*    Eugene D. Rowenhorst,  by signing his name hereto,  does sign this document
     on behalf of the persons  indicated  above  pursuant to a power of attorney
     duly executed by such person and  previously  filed with the Securities and
     Exchange Commission.


                                       By: /s/ Eugene D. Rowenhorst
                                           ------------------------
                                               Eugene D. Rowenhorst
                                               Attorney-in-Fact


                                       7