You will put some of the mortgage interest with the rental house entered on Sch E and the part for when it was your main home, will go in the federal, deductions and credits section for your Sch A.
Example:
$6,000 interest
lived in the home 3 months so 3/12 of $6,000 is $1,500 on Sch A
rental home 9 months, so $4,500 on Sch E.
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