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Yes, you can deduct mortgage interest on your federal income tax return, but there are some conditions. The mortgage must be a secured debt on a qualified home in which you have an ownership interest. A qualified home includes your main home or second home.

The interest you pay on a mortgage for a third home or for a rental property is not deductible. Also, the total amount you can deduct is limited if all mortgages used to buy, construct, or improve your main home (and second home if applicable) total more than $1 million ($500,000 if you're married and filing separately), or if you took out the mortgage after December 15, 2017, and all mortgages total more than $750,000 ($375,000 if you're married and filing separately).

Also, you must itemize your deductions to claim mortgage interest on your tax return. If you take the standard deduction, you can't deduct mortgage interest.