To enter home office expenses on Form 2106
Open the return, and go to Schedule A (1040).
Select line 20, and link that to line 4 of Form 2106 (the entry for the Business Use of Home worksheet).
Complete all applicable information on the Business Use of Home worksheet.
Make sure if you enter home mortgage interest, real estate taxes, or casualty losses on lines 9-11, you also enter these amounts in full on Sch A. These items are used on Form 2106 only for limitation purposes.
Form 2106 is used only for employees. If you are self-employed, you should use Form 8829 for your office-in-home expenses. (This is linked from line 30 of Sch C (1040)).
This information applies to all years of the UltimateTax software.