I'm having the same issue.
1. On Simplified Method Smart Worksheet on Form 8829, Line A. is showing the Expense as a negative number pulled from Line 28 on Schedule C!
2. What it should be pulling is line 29, the Profit or Loss which is Line 7 minus Line 28. I have a Positive Profit, yes the simplified worksheet is pulling in a negative number.
3. I even reviewed with my Accountant and he told me about this. There is also no way to OverRide this in Turbo Tax that I can find.
Of note, my housing is 100%, so it would not be multiplying by 0 thus reducing my deduction.
