Home Office Deduction: Rules, Methods, and Common Mistakes
The home office deduction allows self-employed individuals to deduct expenses related to the business use of their home. While it is a legitimate and valuable deduction, it is also one of the most commonly misunderstood provisions in the tax code.
Who Qualifies?
You must use a portion of your home regularly and exclusively for business. This space must be your principal place of business, or a place where you regularly meet clients. Important: W-2 employees working from home generally cannot claim this deduction since the 2017 Tax Cuts and Jobs Act.
Simplified Method
- Deduct $5 per square foot of home office space
- Maximum of 300 square feet ($1,500 maximum deduction)
- No need to track actual expenses
- No depreciation recapture when you sell your home
Regular Method
- Calculate the percentage of your home used for business
- Deduct that percentage of actual expenses: mortgage interest, insurance, utilities, repairs, depreciation
- More paperwork but potentially a much larger deduction
- Must track all household expenses throughout the year
Common Mistakes to Avoid
- Using the space for personal activities (violates the exclusive use test)
- Claiming a deduction as a W-2 employee
- Not keeping records of expenses and square footage measurements
- Forgetting to include the deduction for the business percentage of internet and phone costs
Report the home office deduction on Form 8829 (regular method) or directly on Schedule C (simplified method). The deduction cannot create a business loss — it is limited to your net business income.
