This is a two part question, main home and rental house. Divided by whatever values each part represents. For example: Your main home may be worth twice the value of the rental to make 1/3 of the loan rental and 2/3 main.
Main home, deducted on sch A:
- Interest
- Real estate taxes
- Points or loan origination fees
- PMI, private mortgage insurance
Rental home, deducted on sch E:
see What can I deduct when refinancing rental property?
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