Ordinarily as an owner you could claim a loss to the extent that you invested in the property. It does not sound like you made any investment. Also, you would have to see how the property was handled in her bankrupcty. If she claimed ownership of 100% on her bankruptcy schedule, there would be nothing for you to take as a loss.
I agree with attorney Givner. Please verify the information with your ex wife. You do not want to invite a tax audit because both of you claimed the same property.
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I agree with my colleagues. Avoid the tax audit.
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