If you own a cooperative condo, see Special Rules for Cooperatives, later. See State and Local Real Estate Taxes and Home Mortgage Interest, later, to find out whether you meet the principles to deduct all the mortgage curiosity in your loan and all the actual property taxes on your primary home.. You meet the rules to deduct all of the mortgage interest in your mortgage and the entire actual estate taxes on your major home. You paid a portion of the mortgage interest or state and local real property taxes from your personal sources (that is, out-of-pocket payments not sponsored…