The Home Office Deduction, Done Right (S-Corp Owners: You’re Doing It Wrong)
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Few deductions carry more folklore than the home office. Half of taxpayers think it’s an automatic audit; the other half think a laptop on the kitchen table qualifies. Both are wrong — and S-corp owners, as a group, are claiming it through the wrong door entirely.
First, who actually qualifies
Two tests, both required:
Regular and exclusive use. A space used only for the business — a dedicated room or a clearly defined area. The guest room that’s 80% office and 20% Peloton fails the letter of the test. Exclusive means exclusive.
Principal place of business. Satisfied automatically if you perform administrative and management work there and have no other fixed location for it — which describes most virtual businesses, consultants, and owner-operators.
One more thing: this is a deduction for the self-employed and business owners. W-2 employees working from home cannot claim it on their federal return — that door closed in 2018, no matter how permanent your remote arrangement is. (New York commuters: your home office also generally doesn’t beat the convenience-of-the-employer rule. Different article, same disappointment.)
Two ways to compute it
Simplified method: $5 per square foot, up to 300 square feet — a maximum of $1,500. Zero recordkeeping beyond the footage. Fine for small spaces.
Actual method: the business-use percentage of your home (office square footage ÷ total) applied to real costs — utilities, insurance, repairs, and depreciation (for owners) or rent (for renters). On a 200 sq ft office in a 2,000 sq ft home with $30,000 of qualifying annual costs, that’s a $3,000 deduction, double the simplified cap. The tradeoff: records, and a depreciation component that gets recaptured when you sell the home.
The S-corp twist: stop using Form 8829
Here’s the part that’s misfiled constantly. Form 8829 belongs to Schedule C filers. Once you’re an S-corp, you’re an employee of your corporation, and employees can’t deduct home offices. Claiming it the sole-proprietor way is simply wrong on an S-corp return.
The correct mechanism is an accountable plan: a written reimbursement policy under which the corporation reimburses you, the employee, for the business-use portion of your home costs, based on a submitted expense calculation. The result is better than a deduction:
• The corporation deducts the reimbursement as an ordinary business expense.
• The reimbursement is tax-free to you — not wages, not a distribution.
• No depreciation recapture complexity on your personal return.
The same accountable plan should also be reimbursing your business mileage, cell phone, and internet business-use percentage. Requirements: a written plan, actual expense substantiation submitted on a regular cadence (we recommend quarterly), and reimbursements paid through the entity’s books. No documentation, no plan — the IRS treats sloppy reimbursements as wages.
The audit-proofing checklist
1. Photograph the space annually; keep a floor plan with measurements.
2. Keep the written accountable plan in your corporate records.
3. Submit expense calculations quarterly with statements attached.
4. Reimburse by actual entity payment, coded consistently in the books.
Done this way, the home office isn’t an audit risk. It’s one of the most defensible items on the return.
Romanchuk CPA LLC sets up accountable plans as a standard part of S-corp client onboarding — most new clients arrive without one and have been leaving this money on the table for years. Book at rfg.tax.
This article is general information, not tax advice for your specific situation.