Exhibit 99.1

ORRICK, HERRINGTON & SUTCLIFFE LLP

666 FIFTH AVENUE

NEW YORK, NEW YORK 10103

February 10, 2010

Credit Suisse

11 Madison Avenue

New York, New York 10010

Ladies and Gentlemen:

We have acted as special tax counsel to Credit Suisse AG, a corporation incorporated under the laws of Switzerland (the “Company”), in connection with the preparation and filing of pricing supplement no. J128 dated February 5, 2010 relating to Semi-Annual Review Notes due February 10, 2012 Linked to the Performance of a Basket Consisting of the Dow Jones EURO STOXX 50® Index, the FTSE™ 100 Index and the TOPIX® Index. (the “Pricing Supplement”), to the product supplement dated March 25, 2009 relating to Annual Review Notes Linked to the Performance of One or More Indices or Exchange Traded Funds or a Basket (the “Product Supplement”), to the prospectus supplement dated March 25, 2009 (the “Prospectus Supplement”) for the Company’s Senior Medium-Term Notes and Subordinated Medium-Term Notes relating to the prospectus dated March 25, 2009 (the “Prospectus”) contained in the Company’s Registration Statement (No. 333-158199-10) (the “Registration Statement”).  This opinion is being furnished in accordance with the requirements of Section 601(b)(8) of Regulation S-K of the Securities Act of 1933, as amended (the “Act”).

In our opinion, the discussions under the heading “Certain United States Federal Income Tax Considerations” in the Product Supplement and in the Pricing Supplement, subject to the conditions and limitations described therein, set forth the material U.S. federal income tax considerations applicable generally to holders of the securities offered pursuant to the Pricing Supplement as a result of the ownership and disposition of such securities.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the references to us under the heading “Certain United States Federal Income Tax Considerations” in the Product Supplement and in the Pricing Supplement.  By such consent we do not concede that we are an “expert” for the purposes of the Act.

Very truly yours,

/s/ Orrick, Herrington & Sutcliffe LLP