How Do Two Unmarried People Claim Mortgage Interest for Tax Purposes?

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Claiming the home mortgage interest deduction can make a big difference when filing your income taxes. But questions about who gets to claim this tax break often arise when two people pay the mortgage, especially when they aren't married or will file separate tax returns. Fortunately the Internal Revenue Service offers some guidance on this slightly fuzzy area of the tax code.

Follow the Money

One of the basic rules of income taxes is that the person paying the expense gets the deduction, and the home mortgage interest deduction is no exception. If you and another person pay the mortgage, you can each take a deduction only for the amount of mortgage interest that you actually pay, assuming you meet the other requirements. For example if the total mortgage payments for the year are $10,000, and you pay only $4,000, you can deduct only 40 percent of the mortgage interest, even if the other person agrees to let you claim his portion. This applies not only to unmarried individuals, but to married couples who file separate returns.


The Internal Revenue Service limits your eligibility to take a mortgage interest deduction to a primary residence and one second home. You must have an ownership interest in the home and a legal responsibility to pay the mortgage before you can claim the deduction. If you are paying someone else's mortgage, and you don't have an ownership interest in the home, you can't take the deduction.

Mortgage Statement

Even if more than one person signs a mortgage, banks will usually issue only one 1098 mortgage interest statement, generally to the first person named on the mortgage document. As far as the IRS knows, only one person paid the entire amount of mortgage interest.

Schedule A

When filling out Schedule A, the person who received the 1098 should enter her share of the deduction on line 10 of her Schedule A. The person who did not get the 1098 should enter his share of the deduction on line 11 of his Schedule A, and write "see attached" next to the line. The second person should attach a statement that details how much interest was paid by each person, and it should state the name and address of the person who received the 1098.