DawnC
Expert Alumni

Get your taxes done using TurboTax

Mortgage interest works the same way.   Once the business use percentage is figured, TurboTax will calculate the percentage of deductions available.  You can enter the full amounts and they will get properly calculated.   You are not going to change the number if you are letting TurboTax calculate the deductions.    However, you have the option to calculate the amounts yourself and enter the adjusted amounts on the different schedules (business vs personal).   In that case, you would change the amounts, but no, you don't need to explain anything.   Everything from your 1098 will be included somewhere on the return.   

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