Think I found the reason. If you have no business expenses, but you do have home office expenses. Turbotax doesn't enter a value on Schedule C line 28. Once you put in depreciation for the home office, it puts a 0 in line 13 and then line 28 on Schedule C. Now it thinks you have general business expenses, but it doesn't know the % of the home office expenses. Turbotax never prompts the user to enter that percentage that populates the entry "Percent of gross income from business use of home reported on Schedule C" on the Form 8829 Worksheet "Part II - Calculation for Business Income Limit for Form 8829, Line 8 or Simple Method, Line A". I put in 100% and my expenses magically reappeared.
