To deduct the mortgage interest you must be a legal owner, or a beneficial owner, AND you must actually pay the interest. If you are on the deed, we don't have to define "beneficial owner," but if you don't actually make the mortgage payments, you can't deduct the interest. That would include giving money to your daughter, who then pays the mortgage, but if audited, it would be easier to prove if you paid the lender directly.
To deduct property taxes, you must be a legal owner AND you must actually pay the taxes. There is no rule allowing a beneficial owner to deduct the taxes.
