It is best to put the mortgage interest and property tax in the rental section first, so the program can allocate it to your home while taking into consideration the percentage of business use of the rental area.
The property tax and interest in the non-rental area in TurboTax should be the total amount multiplied by the personal use percentage of the house. You can do that calculation manually and enter the amounts in the personal deductions section of TurboTax.
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