When you convert your home to a rental home mid-year, you should prorate the mortgage interest between personal use and business use.
The personal use portion is deducted as mortgage interest in Deductions & Credits > Your Home > Mortgage interest (box 1 of the 1098 entry page).
The rental use portion is deducted as a rental expense in the Rental section of TurboTax.
The same method applies for property taxes.
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