If you run your business from home, the home office deduction can be one of the most valuable write-offs you have — and one of the most misunderstood. It lets you deduct a portion of your housing costs as a business expense. The rules are stricter than many people assume, but for those who qualify, it’s real money back. Here’s how it works and how to claim it without raising red flags.
Who Qualifies
To claim the deduction, part of your home must be used regularly and exclusively for business. “Exclusively” is the word that disqualifies most people — the space can’t double as a guest room or the kitchen table where the family eats dinner. It must be a dedicated business area. It also generally has to be your principal place of business, where you do most of your work or meet clients.
Important: since the 2018 tax law, this deduction is for the self-employed. W-2 employees working from home generally cannot claim it on their federal return, even if they work remotely full time.
Two Ways to Calculate It
- Simplified method — deduct a flat $5 per square foot of office space, up to 300 square feet (a maximum of $1,500). No receipts to track, no depreciation math. Easiest for most people
- Regular (actual-expense) method — figure the percentage of your home the office takes up (office square footage ÷ total home square footage), then deduct that percentage of rent or mortgage interest, utilities, insurance, and repairs. More paperwork, but often a larger deduction for a bigger space
A common approach is to calculate it both ways the first year and use whichever gives the bigger deduction. The simplified method wins on convenience; the regular method usually wins on dollars if your home expenses are high or your office is large.
What You Can Include
- A share of housing costs — rent or mortgage interest, property taxes, homeowners or renters insurance, utilities, and general repairs (the regular method)
- Direct expenses — costs that apply only to the office, like painting that one room, are fully deductible
- Not the whole house — you deduct only the business-use percentage, not your entire rent or mortgage
Records and Cautions
Measure your office and your home and keep the calculation. If you use the regular method, save utility bills, insurance statements, and repair receipts. One thing to know if you own your home: claiming depreciation under the regular method can create a small tax effect when you sell. It’s not a reason to skip the deduction, but it’s worth asking a tax preparer about if you own.
The Bottom Line
The home office deduction is a legitimate, valuable write-off for the self-employed who use a dedicated space regularly and exclusively for business. Choose the simplified method ($5 per square foot, up to $1,500) for ease, or the regular method for a potentially bigger deduction if you keep good records. Either way, the “exclusive use” rule is the one to respect — and a quick check with a tax professional is wise if you own your home.
Further Reading
- Bookkeeping Basics for the Self-Employed
- What Is a Schedule C?
- How to Get Tax Deductions
- Small Business Hub
This article is educational only and is not legal, tax, or financial advice. Business, tax, and retirement rules vary by situation and change over time. Consult a qualified attorney, CPA, or financial professional before making decisions about your specific business.