The good news is that schedule A is sent to the IRS and it has one box with mortgage interest. The program is doing work behind the scenes trying to get the information right. It does not matter what date or balance you use since it does not go on the Sch A. Only the correct mortgage interest is critical.
If you are confident in your calculations and ready with the paperwork in case the IRS asks, enter the information such that sch A is correct.
See:
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
