8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

Current Report

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 8, 2006

Citibank (South Dakota), National Association

on behalf of

Citibank Credit Card Master Trust I

(Issuing Entity in respect of the Collateral Certificate)

and

Citibank Credit Card Issuance Trust

(Issuing Entity in respect of the Notes)

(Exact name of registrant as specified in charter)

   United States of America        46-0358360

   (State or other jurisdiction of incorporation)      (I.R.S. Employer Identification No.)

333-131355

(Commission File Number)

 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

 (Former name or former address, if changed since last report): Not Applicable

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01Other Events.

On May 8, 2006, Citibank Credit Card Issuance Trust issued additional Notes of the Citiseries tranche entitled Floating Rate Class 2006-A1 Notes of February 2013 (Legal Maturity Date February 2015) in the principal amount of $200,000,000. The terms of the additional Class 2006-A1 Notes are set forth in the Terms Document dated May 8, 2006 and attached hereto as Exhibit 4. On May 8, 2006, Michael S. Zuckert, Esq., General Counsel, Finance and Capital Markets of Citigroup Inc., delivered a legality opinion with respect to the additional Class 2006-A1 Notes and Cravath, Swaine & Moore LLP delivered a tax opinion with respect to the additional Class 2006-A1 Notes. The legality and tax opinions are attached hereto as Exhibit 5.1 and Exhibit 8.1, respectively.

Capitalized terms used but not defined herein have the meanings ascribed to such terms in the Indenture dated as of September 26, 2000, as amended by Amendment No. 1 thereto dated as of November 14, 2001, each between the issuance trust and Deutsche Bank Trust Company Americas, as trustee.

Item 9.01Financial Statements and Exhibits.

(a)Not applicable.

(b)Not applicable.

(c)Exhibits.

The following exhibits are filed herewith:

Exhibit 4Terms Document dated May 8, 2006 with respect to the additional Class 2006-A1 Notes

Exhibit 5.1Opinion of Michael S. Zuckert, Esq., General Counsel, Finance and Capital Markets of Citigroup Inc., with respect to legality

  of the additional Class 2006-A1 Notes

Exhibit 8.1Opinion of Cravath, Swaine & Moore LLP with respect to tax matters concerning the additional Class 2006-A1 Notes

Exhibit 23.1Consent of Michael S. Zuckert, Esq., General Counsel, Finance and Capital Markets of Citigroup Inc. (included in Exhibit 5.1)

Exhibit 23.2Consent of Cravath, Swaine & Moore LLP (included in Exhibit 8.1)

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

                                     CITIBANK (SOUTH DAKOTA),

NATIONAL ASSOCIATION,

as Depositor and Servicer of Citibank Credit Card Master Trust I

and as Depositor and Managing Beneficiary of Citibank Credit Card Issuance Trust

(Registrant)

By: /s/ Douglas C. Morrison

        -----------------------------

        Douglas C. Morrison

Vice President

Dated: May 8, 2006

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EXHIBIT INDEX

Exhibit No.Description

           4   Terms Document dated May 8, 2006 with respect to the additional Class 2006-A1 Notes

5.1Opinion of Michael S. Zuckert, Esq., General Counsel, Finance and Capital Markets of Citigroup Inc., with respect to legality of the additional Class 2006-A1 Notes

8.1Opinion of Cravath, Swaine & Moore LLP with respect to tax matters concerning the additional Class 2006-A1 Notes

23.1Consent of Michael S. Zuckert, Esq., General Counsel, Finance and Capital Markets of Citigroup Inc. (included in Exhibit 5.1)

23.2Consent of Cravath, Swaine & Moore LLP (included in Exhibit 8.1)

EX-4

                     Exhibit 4

CITIBANK CREDIT CARD ISSUANCE TRUST

Citiseries

Class 2006-A1 Notes

(Issuance Date May 8, 2006)

                                            Issuer Certificate

Pursuant to Sections 202 and 301(h) of the Indenture

Reference is made to the Indenture, dated as of September 26, 2000, as amended by Amendment No. 1 thereto dated as of November 14, 2001, each between Citibank Credit Card Issuance Trust (the "Issuer") and Deutsche Bank Trust Company Americas, as trustee (the "Indenture"). Capitalized terms used herein that are not otherwise defined have the meanings set forth in the Indenture. All references herein to designated Sections are to the designated Sections of the Indenture.

Section 301(h) provides that the Issuer may from time to time create a tranche of Notes either by or pursuant to an Issuer Certificate setting forth the principal terms thereof. Pursuant to an Issuer Certificate dated February 7, 2006 and an Issuer Certificate dated March 3, 2006, a tranche of Notes of the Citiseries designated Class 2006-A1 was established, of which $500,000,000 Outstanding Dollar Principal Amount is Outstanding (the "Outstanding Class 2006-A1 Notes"). This Issuer Certificate relates to additional Notes of Class 2006-A1 (hereinafter, the "New Class 2006-A1 Notes", and together with the Outstanding Class 2006-A1 Notes, the "Class 2006-A1 Notes") having the following terms:

Series Designation: Citiseries. This series is included in Group 1.

Tranche Designation: $700,000,000 Floating Rate Class 2006-A1 Notes of February 2013 (Legal Maturity Date February 2015)

Currency: The Class 2006-A1 Notes will be payable, and denominated, in Dollars.

Denominations: The New Class 2006-A1 Notes will be issuable in minimum denominations of $100,000 and multiples of $1,000 in excess of that amount.

Issuance Date: May 8, 2006

Initial Principal Amount: $200,000,000

Issue Price: 100%

Interest Rate: Interest will accrue on the New Class 2006-A1 Notes from May 8, 2006. The Class 2006-A1 Notes will accrue interest with respect to any interest period at a per annum rate equal to the Class 2006-A1 Note Rate for such interest period, calculated on the basis of the actual number of days in such interest period divided by 360. The "Class 2006-A1 Note Rate" means, with respect to the interest period beginning on May 8, 2006, 5.20% per annum and, with respect to each interest period thereafter, a per annum rate equal to LIBOR for such interest period plus 0.04%.

The Issuer will determine LIBOR for each applicable interest period on the second business day before the beginning of that interest period. For purposes of calculating LIBOR, a business day is any day on which dealings in deposits in U.S. Dollars are transacted in the London interbank market.

"LIBOR" means, as of any date of determination, the rate for deposits in U.S. Dollars for the Designated Maturity (commencing on the first day of the relevant interest period) which appears on Telerate Page 3750 as of 11:00 a.m., London time, on such date. If such rate does not appear on Telerate Page 3750, the rate for that day will be determined on the basis of the rates at which deposits in U.S. Dollars are offered by the Reference Banks at approximately 11:00 a.m., London time, on that day to prime banks in the London interbank market for the Designated Maturity (commencing on the first day of the relevant interest period). The Issuer will request the principal London office of each of the Reference Banks to provide a quotation of its rate. If at least two such quotations are provided, the rate for that day will be the arithmetic mean of the quotations. If fewer than two quotations are provided as requested, the rate for that day will be the arithmetic mean of the rates quoted by major banks in New York City, selected by the Issuer, at approximately 11:00 a.m., New York City time, on that day for loans in U.S. Dollars to leading European banks for a period of the Designated Maturity (commencing on the first day of the relevant interest period).

"Telerate Page 3750" means the display page currently so designated on the Moneyline Telerate Service (or such other page as may replace that page on that service for the purpose of displaying comparable rates or prices).

"Designated Maturity" means three months, however, upon the occurrence of an Event of Default or an Early Redemption Event with respect to the Class 2006-A1 Notes, or if the Class 2006-A1 Notes are not paid in full on their Expected Principal Payment Date, "Designated Maturity" means one month.

"Reference Banks" means four major banks in the London interbank market selected by the Issuer.

Scheduled Interest Payment Dates: The 7^th day of each February, May, August and November, beginning August 2006.

Each payment of interest on the New Class 2006-A1 Notes will include all interest accrued from and including the preceding Interest Payment Date -- or, for the first interest period with respect to the New Class 2006-A1 Notes, from and including May 8, 2006 -- to and including the day preceding the current Interest Payment Date, plus any interest accrued but not previously paid.

The first deposit targeted to be made to the Interest Funding sub-Account for the Class 2006-A1 Notes with respect to the New Class 2006-A1 Notes will be on t he June 7, 2006 Interest Deposit Date and in an amount equal to $866,666.67.

Expected Principal Payment Date: February 7, 2013

Legal Maturity Date: February 9, 2015

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Monthly Principal Date: For the month in which the Expected Principal Payment Date occurs, February 7, 2013, and for each other month, the 7^th day of such month, or if such day is not a Business Day, the next following Business Day.

Required Subordinated Amount of Class B Notes: $11,965,820.

Required Subordinated Amount of Class C Notes: $15,954,420.

Controlled Accumulation Amount: $16,666,667.

Form of Notes: The New Class 2006-A1 Notes will be issued as Global Notes. The Global Notes will initially be registered in the name of Cede & Co., as nominee of The Depository Trust Company, and will be exchangeable for individual Notes only in accordance with the provisions of Section 204(c).

Additional Issuances of Class 2006-A1 Notes: The Issuer may at any time and from time to time issue additional Class 2006-A1 Notes, subject to the satisfaction of (i) the conditions precedent set forth in Section 311(a) and (ii) the following conditions:

(a) the Issuer has obtained written confirmation from each Rating Agency that there will be no Ratings Effect with respect to the then outstanding Class 2006-A1 Notes as a result of the issuance of such additional Class 2006-A1 Notes;

(b) as of the date of issuance of the additional Class 2006-A1 Notes, all amounts due and owing to the Holders of the then outstanding Class 2006-A1 Notes have been paid and there is no Nominal Liquidation Amount Deficit with respect to the then outstanding Class 2006-A1 Notes;

(c) the additional Class 2006-A1 Notes will be fungible with the original Class 2006-A1 Notes for federal income tax purposes;

(d) if Holders of the then outstanding Class 2006-A1 Notes have benefit of a Derivative Agreement, the Issuer will have obtained a Derivative Agreement for the benefit of the Holders of the additional Class 2006-A1 Notes; and

(e) the ratio of the Controlled Accumulation Amount to the Initial Dollar Principal Amount of the Class 2006-A1 Notes, including the additional Class 2006-A1 Notes, will be equal to the ratio of the Controlled Accumulation Amount (before giving effect to the additional issuance) to the Initial Dollar Principal Amount of the Class 2006-A1 Notes, excluding the additional Class 2006-A1 Notes.

As of the date of issuance of additional Class 2006-A1 Notes, the Outstanding Dollar Principal Amount and Nominal Liquidation Amount of the Class 2006-A1 Notes will be increased to reflect the Initial Dollar Principal Amount of the additional Class 2006-A1 Notes.

Any outstanding Class 2006-A1 Notes and any additional Class 2006-A1 Notes will be equally and ratably entitled to the benefits of the Indenture without preference, priority or distinction.

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Optional Redemption Provisions other than Section 1202 "Clean-Up Call": None

Additional Early Redemption Events or changes to Early Redemption Events: None

Additional Events of Default or changes to Events of Default: None

Securities Exchange Listing: Application will be made to list the New Class 2006-A1 Notes on the Irish Stock Exchange.

Provisions Relating to Issuance of New Class 2006-A1 Notes: The New Class 2006-A1 Notes are part of the Class 2006-A1 Notes, and the Outstanding Class 2006-A1 Notes and the New Class 2006-A1 Notes together constitute a single tranche of Class 2006-A1 Notes and will be equally and ratably entitled to the benefits of the Indenture without preference, priority or distinction. The New Class 2006-A1 Notes are fungible with the Outstanding Class 2006-A1 Notes and are intended to trade interchangeably with the Outstanding Class 2006-A1 Notes.

The Initial Dollar Principal Amount of the New Class 2006-A1 Notes is $200,000,000, and, after giving effect to the issuance of the New Class 2006-A1 Notes, the Initial Dollar Principal Amount of the Class 2006-A1 Notes will be the sum of the Initial Dollar Principal Amounts of the Outstanding Class 2006-A1 Notes and the New Class 2006-A1 Notes.

The Nominal Liquidation Amount of the New Class 2006-A1 Notes is $200,000,000, and, after giving effect to the issuance of the New Class 2006-A1 Notes, the Nominal Liquidation Amount of the Class 2006-A1 Notes will be the sum of the Nominal Liquidation Amounts of the Outstanding Class 2006-A1 Notes and the New Class 2006-A1 Notes.

The Controlled Accumulation Amount of the New Class 2006-A1 Notes is $16,666,667, and, after giving effect to the issuance of the New Class 2006-A1 Notes, the Controlled Accumulation Amount of the Class 2006-A1 Notes will be the sum of the Controlled Accumulation Amounts of the Outstanding Class 2006-A1 Notes and the New Class 2006-A1 Notes.

The Required Subordinated Amount of Class B Notes for the New Class 2006-A1 Notes is $11,965,820, and, after giving effect to the issuance of the New Class 2006-A1 Notes, the Required Subordinated Amount of Class B Notes for the Class 2006-A1 Notes will be the sum of the Required Subordinated Amounts of Class B Notes for the Outstanding Class 2006-A1 Notes and the New Class 2006-A1 Notes. The Required Subordinated Amount of Class C Notes for the New Class 2006-A1 Notes is $15,954,420, and, after giving effect to the issuance of the New Class 2006-A1 Notes, the Required Subordinated Amount of Class C Notes for the Class 2006-A1 Notes will be the sum of the Required Subordinated Amounts of Class C Notes for the Outstanding Class 2006-A1 Notes and the New Class 2006-A1 Notes.

This Issuer Certificate and the two Issuer Certificates relating to the Outstanding Class 2006-A1 Notes together constitute the terms document for the Class 2006-A1 Notes.

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The New Class 2006-A1 Notes shall have such other terms as are set forth in the form of Note attached hereto as Exhibit A. Pursuant to Section 202, the form of Note attached hereto has been approved by the Issuer.

CITIBANK CREDIT CARD ISSUANCE TRUST

By Citibank (South Dakota),

National Association,

as Managing Beneficiary

/s/ Douglas C. Morrison

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

Douglas C. Morrison

Vice President

Dated: May 8, 2006

5

Citiseries

Class 2006-A1 Notes

(Issuance Date May 8, 2006)

Reference is made to (i) the resolutions adopted by the Board of Directors of Citibank (South Dakota), National Association ("Citibank (South Dakota)") on April 26, 2000, as amended on September 25, 2001 and (ii) the resolutions adopted by the Board of Directors of Citibank (Nevada), National Association ("Citibank (Nevada)") on April 25, 2000, as amended on October 23, 2001. The resolutions authorize Citibank (South Dakota) and Citibank (Nevada), respectively, from time to time to issue and sell, or to arrange for or participate in the issuance and sale of, one or more series and/or classes of pass-through certificates, participation certificates, commercial paper, notes or other securities representing ownership interests in, or backed by, pools of credit card receivables or interests therein ("Receivables") in an aggregate principal amount such that up to $100,000,000,000 of such certificates, commercial paper, notes or securities are outstanding at any one time and to sell, transfer, convey or assign Receivables to trusts or other special purpose entities in connection therewith on such terms as to be determined by a Pricing and Loan Committee (the "Pricing and Loan Committee") of the respective institution.

Each of the undersigned, a duly authorized member of the Citibank (South Dakota) and Citibank (Nevada) Pricing and Loan Committees, respectively, on behalf of such Pricing and Loan Committee, does hereby certify that the terms of the New Class 2006-A1 Notes set forth in and to be created by the preceding Issuer Certificate and the increase in the Invested Amount of the Collateral Certificate resulting from the issuance of such Notes have been approved by such Pricing and Loan Committee. In addition, the following underwriting/selling agent terms with respect to the New Class 2006-A1 Notes have been approved by such Pricing and Loan Committee:

Issue Price: 100%

Underwriting Commission: 0.25%

Proceeds to Issuer: 99.75%

Representative of the Underwriters: Citigroup Global Markets Inc.

The preceding Issuer Certificate and this certification of Pricing and Loan Committee approval shall be, continuously from the time of their execution, official records of Citibank (South Dakota) and Citibank (Nevada), respectively.

/s/ Douglas C. Morrison/s/ Robert D. Clark

__________________________________________________________

Douglas C. MorrisonRobert D. Clark

Member of the Pricing and Loan CommitteeMember of the Pricing and Loan Committee

Citibank (South Dakota), National AssociationCitibank (Nevada), National Association

Dated: May 8, 2006

6

Exhibit A

FORM OF

CITISERIES

FLOATING RATE CLASS 2006-A1 NOTES OF FEBRUARY 2013

(Legal Maturity Date February 2015)

$200,000,000< font id="TAB2" style="COLOR: black; LETTER-SPACING: 27pt"> REGISTERED

CUSIP No. 17305E CZ 6No. R-3

UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO THE ISSUER OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THE PRINCIPAL OF THIS NOTE IS PAYABLE AS SET FORTH HEREIN AND IN THE INDENTURE REFERRED TO BELOW. ACCORDINGLY, THE OUTSTANDING PRINCIPAL AMOUNT OF THIS NOTE AT ANY TIME MAY BE LESS THAN THE AMOUNT SHOWN ON THE FACE HEREOF.

CITIBANK CREDIT CARD ISSUANCE TRUST

CITISERIES

FLOATING RATE CLASS 2006-A1 NOTES OF FEBRUARY 2013

(Legal Maturity Date February 2015)

CITIBANK CREDIT CARD ISSUANCE TRUST, a trust formed and existing under the laws of the State of Delaware (including any successor, the "Issuer"), for value received, hereby promises to pay to CEDE & CO., or its registered assigns, the principal amount of TWO HUNDRED MILLION DOLLARS ($200,000,000). The Expected Principal Payment Date for this Note is February 7, 2013. The Legal Maturity Date for this Note is February 9, 2015.

The Issuer hereby promises to pay interest on this Note on the 7^th day of each February, May, August and November, beginning August 2006, until the principal of this Note is paid or made available for payment, subject to certain limitations set forth in the Indenture. Interest will accrue on the outstanding principal amount of this Note for each interest period in an amount equal to the product of (i) the actual number of days in such interest period divided by 360, (ii) a rate per annum equal to the Class 2006-A1 Note Rate for such interest period, and (iii) the outstanding principal amount of this Note as of the preceding Interest Payment Date (after giving effect to any payments of principal made on the preceding Interest Payment Date) or, in the case of the first Interest Payment Date, the initial principal amount of this Note. The Class 2006-A1 Note Rate will be determined as provided in the Indenture.

If any Interest Payment Date or Principal Payment Date of this Note falls on a day that is not a Business Day, the required payment of interest or principal will be made on the following Business Day.

This Note is one of the Citiseries, Class 2006-A1 Notes issued pursuant to the Indenture, dated as of September 26, 2000 (as amended and otherwise modified from time to time, the "Indenture") between the Issuer and Deutsche Bank Trust Company Americas, as Trustee. For purposes of this Note, the term "Indenture" includes any supplemental indenture or Issuer Certificate relating to the Citiseries, Class 2006-A1 Notes. This Note is subject to all of the terms of the Indenture. All terms used in this Note that are not otherwise defined herein and that are defined in the Indenture will have the meanings assigned to them therein.

The principal of and interest on this Note are payable in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts.

Each Holder by acceptance of this Note, and each owner of a beneficial interest in this Note by acceptance of a beneficial interest in this Note, is deemed to have consented to such amendments to the Pooling and Servicing Agreement and other operative documents as are necessary to permit the Sellers to retain sale treatment for accounting purposes of the transfer of assets to the Master Trust, in accordance with the provisions of Financial Accounting Standards Board SFAS No. 140.

Reference is made to the further provisions of this Note set forth on the reverse hereof, which will have the same effect as though fully set forth on the face of this Note.

Unless the certificate of authentication hereon has been executed by the Trustee whose name appears below by manual signature, this Note will not

2

be entitled to any benefit under the Indenture, or be valid or obligatory for any purpose.

IN WITNESS WHEREOF, the Issuer has caused this instrument to be signed, manually or in facsimile, by an Issuer Authorized Officer.

CITIBANK CREDIT CARD ISSUANCE TRUST

By:CITIBANK (SOUTH DAKOTA),

NATIONAL ASSOCIATION,

as Managing Beneficiary of

Citibank Credit Card Issuance Trust

By: __________________________________

Douglas C. Morrison

Vice President

Dated: May 8, 2006

TRUSTEE'S CERTIFICATE OF AUTHENTICATION

This is one of the Notes designated above and referred to in the within mentioned Indenture.

DEUTSCHE BANK TRUST COMPANY AMERICAS,

as Trustee under the Indenture

By: _________________________________

Authorized Signatory

By: _________________________________

Authorized Signatory

Dated: May 8, 2006

3

REVERSE OF NOTE

This Note is one of a duly authorized issue of Notes of the Issuer, designated as its Citiseries Floating Rate Class 2006-A1 Notes of February 2013 (Legal Maturity Date February 2015) (herein called the "Notes"), all issued under an Indenture, to which Indenture reference is hereby made for a statement of the respective rights and obligations thereunder of the Issuer, the Trustee and the Holders of the Notes.

This Note ranks pari passu with all other Class A Notes of the same series, as set forth in the Indenture. This Note is secured to the extent, and by the collateral, described in the Indenture.

The Issuer will pay interest on overdue interest as set forth in the Indenture to the extent lawful.

Each Holder by acceptance of this Note, and each owner of a beneficial interest in this Note by acceptance of a beneficial interest in this Note, agrees that no recourse may be taken, directly or indirectly, with respect to the obligations of the Issuer or the Trustee on the Notes, against the Issuer, the Issuer Trustee, the Banks, the Trustee or any affiliate, officer, employee or director of any of them, and the obligation of the Issuer to pay principal of or interest on this Note or any other amount payable to the Holder of this Note will be subject to Article V of the Indenture.

Each Holder by acceptance of this Note, and each owner of a beneficial interest in this Note by acceptance of a beneficial interest in this Note, agrees that this Note is intended to be debt of the Banks for federal, state and local income and franchise tax purposes, and agrees to treat this Note accordingly for all such purposes, unless otherwise required by a taxing authority.

Each Holder by acceptance of this Note, and each owner of a beneficial interest in this Note by acceptance of a beneficial interest in this Note, agrees that it will not at any time institute against the Issuer, or join in any institution against the Issuer of, any bankruptcy, reorganization, arrangement, insolvency or liquidation proceeding, or other proceedings under any United States federal or state bankruptcy or similar law in connection with any obligations relating to this Note, the Indenture or any Derivative Agreement.

This Note and the Indenture will be construed in accordance with and governed by the laws of the State of New York.

No reference herein to the Indenture and no provision of this Note or of the Indenture will alter or impair the obligation of the Issuer, which is absolute and unconditional, to pay the principal of and interest on this Note at the times, place and rate, and in the coin or currency, herein prescribed.

Certain amendments may be made to the Indenture without the consent of the Holder of this Note. This Note must be surrendered for final payment of principal and interest.

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ASSIGNMENT

Social Security or taxpayer I.D. or other identifying number of assignee:____________________

FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers unto

___________________________________________________________________

___________________________________________________________________

(name and address of assignee)

the within Note and all rights thereunder, and hereby irrevocably constitutes and appoints __________________________________________________________, attorney, to transfer said Note on the books kept for registration thereof, with full power of substitution in the premises.

Dated: ____________________________ _________________________*

Signature Guaranteed:

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

* NOTE: The signature to this assignment must correspond with the name of the registered owner as it appears on the face of the within Note in every particular without alteration, enlargement or any change whatsoever.

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EX-5.1

                     Exhibit 5.1

[Citigroup Inc. Letterhead]

           &# 160;           Citigroup Inc.

      425 Park Avenue

         New York, NY 10043

May 8, 2006

Citibank (South Dakota), National Association

701 East 60th Street, North

Sioux Falls, South Dakota 57117

Citibank (Nevada), National Association

8725 West Sahara Avenue

Las Vegas, Nevada 89163

Ladies and Gentlemen:

I am the General Counsel, Finance and Capital Markets of Citigroup Inc. and, in such capacity, I have acted as counsel to Citibank (South Dakota), National Association ("Citibank (South Dakota)") and Citibank (Nevada), National Association ("Citibank (Nevada)"), in connection with the issuance and sale of $200,000,000 aggregate principal amount of Citiseries Floating Rate Class 2006-A1 Notes of February 2013 (Legal Maturity Date February 2015) (the "Notes") by Citibank Credit Card Issuance Trust (the "Issuance Trust"). The Notes will be issued pursuant to an Indenture dated as of September 26, 2000 between the Issuance Trust and Deutsche Bank Trust Company Americas (formerly Bankers Trust Company), as Trustee, as amended by Amendment No. 1 thereto dated as of November 14, 2001 and an Issuer Certificate, dated as of May 8, 2006, relating to the Notes (the "Terms Document" and together, the "Indenture"). Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in or pursuant to the Indenture.

I, or attorneys under my supervision, have examined and relied upon the following: signed copies of the Indenture and the Registration Statement on Form S-3 (Registration No. 333-131355), as amended (the "Registration Statement"), for the registration of the Collateral Certificate and the Notes under the Securities Act of 1933, as amended (the "Act"); the prospectus dated April 21, 2006 and prospectus supplement dated May 2, 2006 relating to the Notes (together, the "Prospectus"); a specimen of the Notes, and originals, or copies certified or otherwise identified to my satisfaction, of such corporate records, certificates or documents as I have deemed appropriate as a basis for the opinion expressed below. In such examination, I (or such persons) have assumed the legal capacity of all natural persons, the genuineness of all signatures, the authenticity of all documents submitted to me (or such persons) as originals, the conformity to original documents of all documents submitted to me (or such persons) as certified or photostatic copies and the authenticity of the originals of such copies.

Based upon and subject to the foregoing, I am of the opinion that when the Notes have been duly executed, authenticated and delivered in accordance with the Indenture, and sold in the manner described in the Prospectus, the Notes will be legally issued, fully paid, non-assessable and binding obligations of the Issuance Trust, and the holders of the Notes will be entitled to the benefits of the Indenture.

Citibank (South Dakota), National Association

Citibank (Nevada), National Association

May 8, 2006

Page 2

The foregoing opinion is subject to applicable bankruptcy, insolvency, reorganization, fraudulent conveyance, moratorium or other similar laws affecting creditors' rights generally from time to time in effect and subject to general principles of equity, regardless of whether such is considered in a proceeding in equity or at law.

I am admitted to the practice of law only in the State of New York and my opinion is limited to matters governed by the laws of the State of New York and Federal laws of the United States of America.

I consent to the filing of this opinion with the Securities and Exchange Commission as an exhibit to a Current Report on Form 8-K for incorporation into the Registration Statement and to the reference to my name in the Prospectus constituting a part of such Registration Statement under the heading "Legal Matters". In giving such consent, I do not thereby admit that I come within the category of persons whose consent is required under Section 7 of the Act, or the rules and regulations of the Securities and Exchange Commission thereunder.

Very truly yours,

/s/ Michael S. Zuckert

Michael S. Zuckert

EX-8.1

Exhibit 8.1

[Letterhead of

CRAVATH, SWAINE & MOORE LLP]

           May 8, 2006

Citibank Credit Card Issuance Trust

$200,000,000 Floating Rate Class 2006-A1 Notes

of February 2013

(Legal Maturity Date February 2015)

Citiseries

Ladies and Gentlemen:

We have acted as special Federal tax counsel for Citibank (South Dakota), National Association, and Citibank (Nevada), National Association, in connection with the issuance and sale of $200,000,000 aggregate initial principal amount of Floating Rate Class 2006-A1 Notes of February 2013 (Legal Maturity Date February 2015) (the “Notes”) of the Citiseries. The Notes will be issued pursuant to the Indenture dated as of September 26, 2000 (as the same has been amended or supplemented, the “Indenture”), between Citibank Credit Card Issuance Trust, as issuer, and Deutsche Bank Trust Company Americas (formerly Bankers Trust Company), as trustee, and the Issuer Certificate, dated as of May 8, 2006, relating to the Notes (the “Terms Document”). Capitalized terms not otherwise defined herein are used as defined in the Indenture and the Terms Document.

In that connection, we have examined originals or copies, certified or otherwise identified to our satisfaction, of such documents, corporate records and other instruments as we have deemed necessary or appropriate for the purposes of this opinion, including (a) the Pooling and Servicing Agreement and the Series 2000 Supplement thereto, (b) the Indenture, (c) the Terms Document, (d) the Registration Statement on Form S-3 (Registration No. 333-131355), as amended, for the registration of the Collateral Certificate and the Notes under the Securities Act, (e) the base prospectus dated April 21, 2006 (the “Base Prospectus”), and the prospectus supplement dated May

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2, 2006 (the “Prospectus Supplement”), relating to the Notes (together, the “Prospectus”), and (f) a specimen of the Notes.

Based upon the foregoing, we hereby confirm that the statements set forth in the Prospectus under the heading “Tax Matters” accurately describe the material Federal income tax consequences to holders of the Notes, and we hereby adopt and confirm the opinions set forth therein.

We know that we are referred to under the headings “Prospectus Summary — Tax Status”, “Tax Matters — Tax Characterization of the Notes” and “Legal Matters” in the Prospectus, and we hereby consent to such use of our name therein and to the use of this opinion for filing as an exhibit to a Current Report on Form 8-K for incorporation into the Registration Statement.

Very truly yours,

/s/ Cravath, Swaine & Moore LLP

Citibank (South Dakota), National Association

701 East 60th Street, North

Sioux Falls, SD 57117

Citibank (Nevada), National Association

8725 West Sahara Avenue

Las Vegas, NV 89163

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