If I am on the title of my sisters house and pay a portion of the mortgage but my name is not on it can I write that off in my taxes for next year?

[Carl]

@jackieh392  I've changed my response here to agree with @TurboTaxColeen TurboTaxColeen as I just looked at IRS Pub 936 and it's been updated for for the 2018 tax law changes apparently. It looks like you can not claim/deduct any interest you paid since the property is not your primary home or 2nd home. Additionally, without you being a signatory on the loan you don't have a legal obligation to pay the loan. So you can't deduct any mortgage interest paid on it.

[Coleen3]

Unfortunately, no. You must be liable for the debt as well as pay the debt.