you'll probably have to enter the interest deduction, fudging some of the numbers since TurboTax cannot calculate average monthly balances, total them, and then divide by 12. Note that some OP have posted that they have received notices from the IRS about miscalculated mortgage interest deduction. This may be due to OP error. However, If the IRS uses its "preferred method" > beginning + ending divided by two, you might get one of these notices.
