The home office deduction lets self-employed individuals and business owners deduct expenses for the portion of their home used exclusively and regularly for business. You can use the simplified method ($5 per square foot, up to 300 sq ft for a max $1,500 deduction) or the regular method tracking actual expenses like mortgage interest, utilities, and insurance. Tax Sherpa recommends the regular method for most clients — it typically yields 2–3x higher deductions.
Key Takeaways
- Two methods: Simplified ($5/sq ft, max $1,500) and Regular (actual expenses pro-rated by business square footage)
- Your space must be used regularly and exclusively for business — a desk in your bedroom counts if the area is dedicated
- The home office must be your principal place of business or where you regularly meet clients
- The regular method deducts mortgage interest/rent, utilities, insurance, repairs, depreciation — all pro-rated
- W-2 employees generally cannot claim the home office deduction (eliminated by the Tax Cuts and Jobs Act through 2025)
Simplified vs. Regular Method
Feature | Simplified Method | Regular Method |
Calculation | $5 × business sq ft | (Business sq ft ÷ total sq ft) × actual expenses |
Maximum deduction | $1,500 (300 sq ft) | No cap — based on actual expenses |
Record-keeping | Minimal — just measure your space | Must track all home expenses |
Depreciation | Not allowed | Yes — depreciation on home portion |
Carryover of excess | Not allowed | Yes — unused deductions carry forward |
Best for | Small spaces, simple situations | Larger spaces, higher home costs |
Example comparison for a 200 sq ft office in a 2,000 sq ft home (10%):
- Simplified: 200 × $5 = $1,000
- Regular: $36,000 annual home costs × 10% = $3,600
That's a $2,600 difference — and it compounds every year.
Qualifying for the Home Office Deduction
The IRS requires two tests:
1. Regular and Exclusive Use
The space must be used regularly for business AND exclusively for business. A spare bedroom used only as your office qualifies. A kitchen table where you also eat dinner does not.
Exception: If you use part of your home to store inventory or product samples, the exclusive use test doesn't apply — but you must use the space regularly.
2. Principal Place of Business
Your home office must be either:
- Your principal place of business (where you do most of your work), OR
- A place where you regularly meet clients or customers, OR
- A separate structure (like a detached garage or shed) used for business
If you work at a client's site during the day but do administrative work from your home office, it still qualifies as your principal place of business for the administrative work.
What You Can Deduct (Regular Method)
Expense | How It's Calculated |
Mortgage interest or rent | Business % of annual payments |
Property taxes | Business % of annual taxes |
Utilities (electric, gas, water) | Business % of annual costs |
Internet | Business % (or higher if dedicated to business) |
Homeowner's/renter's insurance | Business % of annual premium |
Repairs and maintenance | 100% if to office area; business % if to whole house |
Depreciation | Business % of home's depreciable basis over 39 years |
Security system | Business % of monitoring costs |
HOA fees | Business % of annual HOA dues |
Common Mistakes to Avoid
- Using the simplified method by default — Run the numbers both ways. The regular method almost always wins for home offices over 150 sq ft.
- Not claiming it at all due to audit fear — The home office deduction is a legitimate deduction explicitly authorized by the IRS. Proper documentation is your protection.
- Failing the exclusive use test — If your "office" is also a guest bedroom, the IRS can disallow the entire deduction. Dedicate the space.
- Forgetting depreciation recapture — If you sell your home after claiming the regular method, you may owe depreciation recapture tax on the business portion. Factor this into long-term planning.
Frequently Asked Questions
Can I claim the home office deduction if I rent?
Yes. Renters deduct their business percentage of rent, utilities, renter's insurance, and other expenses — the same way homeowners do with mortgage interest.
Does the home office deduction trigger an audit?
The home office deduction itself does not trigger an audit. However, deductions that are disproportionately large relative to income may attract scrutiny. Proper documentation — measurements, expense records, photos of your dedicated space — eliminates risk.
Can I deduct home office expenses if I also have a separate office?
It depends. If your home office is your principal place of business for administrative activities, you can still claim it even if you work elsewhere. However, if your employer provides an office and you simply prefer working from home, you likely don't qualify.
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