If you rent out 3 out of 4 units of your multi-family home, the deduction for mortgage interest
must be allocated between personal use (1/4) and rental use (3/4).
You will claim 1/4 of the interest on Form 1098 as home mortgage interest in Deductions & Credits (Mortgage Interest, Refinancing, and Insurance)of your personal return.
The remainder (3/4) will be listed as an expense of your business (Rental Properties and Royalties (Sch E)).
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