You could do it either way.
Calculate the 26% on your own and enter your Rental Expenses.
Or, in the Property Profile section, enter your Business Use % as 26% and TurboTax will apply that to your Rental Expenses like Mortgage Interest, Property Tax, Insurance, etc.
If you're using TurboTax Desktop, you can adjust any expenses on Schedule E that would apply 100% to the rental, rather than the 26%.
@aduguy

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