The home office deduction has a strange reputation. Some people swear it triggers audits. Others claim space that wouldn’t survive five minutes of IRS scrutiny. The truth is in the middle — it’s a legitimate, valuable deduction with clear rules.
Who qualifies
Two tests, both required:
- Regular and exclusive use — the space is used for business and only business. The kitchen table doesn’t count. A spare bedroom that doubles as a guest room doesn’t either.
- Principal place of business — it’s where you do most of your administrative work, even if you meet clients elsewhere.
W-2 employees no longer qualify (the 2017 tax law removed that). The deduction is for self-employed people, freelancers, and business owners filing Schedule C.
Two ways to calculate
Simplified method: $5 per square foot, up to 300 sq ft, capped at $1,500. No receipts, no math, no depreciation recapture when you sell your home. Perfect for most people.
Actual expense method: Calculate the business-use percentage (office sq ft ÷ total home sq ft), then deduct that percentage of mortgage interest, rent, utilities, insurance, repairs, and depreciation. More work, often a bigger deduction — especially if your home is expensive or your office is large.
The audit myth
The deduction stopped being an audit red flag years ago. Millions of people claim it. What does attract attention is taking it incorrectly — claiming a 40% home-office percentage when your office is one corner of the living room, for example.
Documentation to keep
- Photos of the space
- Square footage measurements
- Annual utility, mortgage/rent, and insurance totals
- A simple log of what work happens there
Take ten minutes to set this up once, and you’ve earned yourself a deduction worth hundreds — sometimes thousands — every year.
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