....in the home office deduction section?
Assuming this is for a SCH C home office, the $750K limit does not apply. You have no excess mortgage interest to report in that section. If you elected to have the program do the math for you, simply enter the total mortgage interest paid as reported on the 1098 and the program will do the math for you.
The program (not you) will then allocated the "personal use" portion to the SCH A and apply any limits there on the SCH A.
