Exhibit 99.1

ORRICK, HERRINGTON & SUTCLIFFE LLP

51 WEST 52ND STREET

NEW YORK, NEW YORK 10019-6142

April 29, 2014

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 term sheet no. STR-14 dated April 22, 2014 relating to Relative Value Strategic Accelerated Redemption Securities® Linked to the Performance of a Basket of Three Financial Stocks versus the iShares 20+ Year Treasury Bond ETF (the “Pricing Supplement”), to the prospectus supplement dated March 23, 2012 (the “Prospectus Supplement”) for the Company’s Senior Medium-Term Notes and Subordinated Medium-Term Notes relating to the prospectus dated March 23, 2012 (the “Prospectus”) contained in the Company’s Registration Statement (No. 333-180300-03) (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 “Material U.S. Federal Income Tax Consequences” 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 “Material U.S. Federal Income Tax Consequences” 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