I also rent rooms in my home, and I may misunderstand the previous answer, or TT is just getting it wrong. In the rental expense questionnaire on TT I checked Yes to let TT do the math. I entered the percentage as 30.0 and then entered the full mortgage expense. The numbers shown for my deductions that will be applied to the rental portion look correct (total x 0.3). But when I got to the section on my home mortage deduction (owners part), the amount supplied by TT was zero. The name of the lender was correct, but TT did not transfer any of my mortgage to the homeowners section. So if I were to use this method I don't know what number I should enter there.
Did I do something wrong? In the past I never trusted TT to get this right, and always did the calculation myself. I'd recommend that approach still.
