This answer string appears to be the most correct. TurboTax DOES NOT enter an adjusted mortgage interest amount in Schedule A for the personal use portion of a rental property. I followed the advice in this string and did my own pro-ration for Schedule A, checking the box that states the amount differs from the 1098 and adding the requested note on the next screen explaining why. I do find it odd that TurboTax not only does the proration for the real estate taxes, but gives you bold reminders that it has done so; however, the app does not do the same for mortgage interest.
