There is a worksheet for everything ... save a PDF of the return and look for the form 8829, form 4562 &/or the depreciation worksheet. 

If your are a W-2 employee, your depreciation report (worksheet), for your home office, will be under Schedule A on your list of forms.
If you are self employed, it will be under Schedule C.

You can also look at back year's forms 8829 and 2106 (W-2 employee)