Ok here is a post with the instructions to file a "claim of right". Basically, you are going to figure out what the tax difference was in the year of bonus but assuming the bonus didn't happen. Use that figure to file for a credit in the year you paid the bonus back.
You will need TurboTax desktop for the year of repayment to make this claim. In the forms mode, go to 1040 wkst line 12D, in the the "Other Payments and Credits Smart Worksheet" box and enter the difference in the taxes paid and taxes you should have paid in the bonus year.
You will not need to do anything with the W2C since your income amount (Box 1) didn't change on the W2.
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