The person that will be able to claim the interest is the person that can show that they made the mortgage payments. If it is not you, IRS will accept her claim and come after you if you claimed it.

If it was you, IRS will credit you and go after the ex. Claiming things that one should not claim is the only thing that IRS worries about.

Tricky. Did you pay half or she paid it in full?

Even though your name is on it, the person that paid should file for the deduction. Good luck.

Either one of you can claim the interest, but it has to be the one (since you are now divorced) that actually PAID the payment.