federal form 8829 is the home office deduction. employees don't get it. so, as self-employed, which does not seem to be the version you are using, it would either be a deduction on schedule C or maybe even schedule E. For federal it is not an itemized deduction. your state situation is unclear, so we need more information.
if you are not self-employed it would seem the only home expenses you could deduct as itemized deductions for federal purpose are real estate taxes and home mortgage interest and form 8829 is not used.
