By Joel Schectman 

WASHINGTON--Two former Credit Suisse AG bankers who pleaded guilty to helping wealthy American evade taxes received no jail time after cooperating in the U.S. case against the Swiss bank but will have to pay a small fine.

The lenient sentence, handed down Friday, came in exchange for the men's cooperation, which helped the Justice Department secure its first guilty plea against a financial institution in more than a decade, according to people familiar with the matter. Last May, Credit Suisse pleaded guilty to "knowingly and willfully" helping thousands of U.S. clients open accounts and conceal their "assets and income from the IRS" and agreed to pay $2.6 billion.

A federal judge in District Court in Alexandria, Va., sentenced Josef Dörig and Andreas Bachmann to five years unsupervised probation for their roles in helping U.S. customers hide earnings from the Internal Revenue Service in Switzerland through a web of secret accounts and shell companies. Mr. Dörig will pay $125,00 and Mr. Bachmann will have to pay $100,000

Write to Joel Schectman at joel.schectman@dowjones.com

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