Self employed

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Your gross income is negative on the 8829 worksheet because line 2 of that worksheet is zero (see screenshot). Line 2 is the percentage of income that you earned from this home office. If you only had one home office and you used that one office all year, this should be 100%. 

This percentage comes from the 8829 line 8 smart worksheet (see screenshot). You can enter the percentage directly in this field, or you can go back through the Step-by-Step screens to enter it.

To enter via Step-by-Step, click through the business use of home screens until you come to the screen asking about Business conducted in home office. Enter the appropriate percentage there.