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In most cases the answer is NO! However there was a tax court case a number of years ago that would allow it under rather narrow circumstances. If you are on the title for the property for a percentage of the ownership and you pay some part of the payment for a loan (not in you name) on that property you may take the interest portion of those payments as a deduction. The ruling seemed to say that you are obligated if you are on title because you will lose the property if the loan is not paid. You would be limited to the part you paid not the percentage of ownership.