Wow. His "innocent mistake" was awfully brazen:

"IMF employees were expected to pay their taxes out of their own money. But the IMF then gave them an extra allowance, known as a "gross-up," to cover those tax payments. This was done in the Annual Tax Allowance Request, in which the employee filled out some basic information — marital status, dependent children, etc. — and the IMF then estimated the amount of taxes the employee would owe and gave the employee a corresponding allowance.

At the end of the tax allowance form were the words, "I hereby certify that all the information contained herein is true to the best of my knowledge and belief and that I will pay the taxes for which I have received tax allowance payments from the Fund." Geithner signed the form. He accepted the allowance payment. He didn't pay the tax. For several years in a row."

http://article.nationalreview.com/?q=YzJjOGQyODY2ZjhhMWY4Y2U3YmVkMjhlMWQ2MWZiNTA