Wow, that was quick! I'll have to look at 32b since 1) the profit is high so it's not going negative 2) the office is exclusive and use is frequent every month.
UPDATE: I looked at box 32b and it's not checked.
So I'm concluding that the software message is wrong, since it does show a deduction for the home office for the business. I work in technology so I understand how these things can happen . . .
