Self-employed people must fill out a special form to claim the home office deduction. You must complete Form 8829, and then transfer the total to your Schedule C when you file your income tax return. Unfortunately, Schedule C-EZ, which is a much simpler form, can't be used if you're claiming the home office deduction. The business portion of your home mortgage interest and real estate taxes is claimed on Form 8829 and cannot be claimed again as an itemized deduction on Schedule A of your return.
The file is in Adobe Portable Document Format (.pdf), and you will need the free Acrobat Reader to view and print the files.
The Home Office Deduction