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The IRS places several limits on the amount of interest that you can deduct each year. For tax years before 2018, the interest paid on up to $1 million of acquisition indebtedness is deductible if you itemize deductions. The interest on an additional $100,000 of debt can be deductible if certain requirements are met.
Starting in 2018, deductible interest for new loans is limited to principal amounts of $750,000. Loans originated prior to 12/16/2017, or under a binding contract that closes prior to 4/1/2018, remain under the old rules for tax years prior to 2018.
Mortgage Interest Deduction