Question

Do i enter only what i pay in box 1 if i split the mortgage with my significant other and my ss# is on the 1098 and it says its uncommon for it to be different?

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It depends. Only split the mortgage interest reported on Form 1098 with your significant other if your significant other co-signed the loan.

See 2020 Instructions Form 1040 Schedule A Lin e8a which refers to borrowers. Without co-signing, your significant other is not considered a borrower.

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