Is the full amount you pay into a property tax impound account deductible? Say you want to pay this year's and next year's taxes now in order to get a deduction because you expect to be in AMT next year. If you pay your taxes directly to the county then you deduct the full amount paid. But if you pay 15 months of property tax into an impound account, I imagine the impound account managers will collect interest on the money and pay the county every 6 months.
And is there a limit on how much you can pre-pay? What if I wanted to pre-pay 10 years worth of property tax?