S-Corp Home Office Deduction: The Only Way That Still Works
You formed the S-corp for the payroll-tax savings, and it delivered. Then you sat down to file, went looking for the home office deduction you'd taken for years as a sole proprietor, and found it had gone nowhere. Your software didn't flag it. Nobody sent a memo.
So can you still take the S-corp home office deduction?
Yes, but not the way a sole proprietor does. Because your S-corp makes you a W-2 employee, you can't put the home office on Schedule C or Schedule A. The one route left is an accountable plan: the corporation reimburses your business-use share of home costs, deducts it, and pays you tax-free.
Why it vanished when you incorporated
As a sole proprietor, your home office lived on Schedule C, and you could take it with actual expenses or the simplified $5-a-square-foot method. Straightforward.
An S-corp changes who you are on paper. You're now two people: a shareholder who owns the company and an employee who works for it. The home office is an employee expense, and employee expenses ran into a wall in 2018, when the Tax Cuts and Jobs Act suspended miscellaneous itemized deductions (the category that held unreimbursed employee costs). A lot of owners assumed that suspension would lapse after 2025 and the deduction would come back.
It didn't. The 2025 tax law made the suspension permanent, effective for tax years beginning in 2026, by amending Section 67 of the Code. So there's no waiting it out anymore. As a shareholder-employee, you have exactly one way to benefit from your home office, and it isn't a line on your 1040.
The one route that works: an accountable plan
An accountable plan is a written arrangement, authorized by Section 62(c) and Treasury Regulation 1.62-2, under which your corporation reimburses you for business expenses you personally paid. Done right, the reimbursement is deductible by the S-corp and completely tax-free to you: no income tax, no payroll tax. The regulation is explicit that these amounts stay out of your W-2 wages entirely.
Three conditions have to hold:
Business connection. The expense has to be a real business cost. For a home office, that means the space clears the Section 280A bar: used regularly and exclusively for the business, and serving as your principal place of business. The spare-room-slash-Peloton-studio doesn't qualify.
Substantiation. You give the corporation the numbers: square footage, the business-use percentage, and the actual costs. The regulation's safe harbor treats expenses substantiated within 60 days as timely.
Return of excess. If the company advances more than you spent, you pay the difference back (within 120 days under the safe harbor).
Mechanically: you total your home costs for the year, apply your office's business-use percentage, submit that as an expense report, and the corporation cuts you a reimbursement and deducts it on the 1120-S.
Here's what that looks like for a renter in LA with a 200-square-foot office in a 2,000-square-foot apartment, so 10% business use.
Annual home costs
Rent: $36,000
Utilities: $3,600
Renters insurance: $400
Total: $40,000
The reimbursement
Business-use portion (10% of $40,000): $4,000
Deducted by the S-corp on Form 1120-S: $4,000
Taxable to you: $0
At a combined federal-and-California marginal rate around 35%, that $4,000 deduction is roughly $1,400 that stays in your pocket.
Where this goes wrong in practice
The $5-a-square-foot trap. Almost everyone reaches for the simplified method, because it's easy and it's what they used as a sole prop. You can't use it here. The IRS safe harbor that created the $5 rate specifically doesn't apply to an employee being reimbursed under an accountable plan. Reimbursements have to be built on actual expenses. So the person who sets up the plan correctly and then reimburses themselves a tidy $1,500 can later have the deduction denied.
Renting your office to your own corporation. It sounds clever: the S-corp pays you rent for the space, deducts the rent, done. But because of the matching principle, when the corporation deducts the rent, you report it as income, and Section 280A(c)(6) blocks you from deducting the offsetting home expenses against it.
Papering it in April. An accountable plan is not something you create retroactively at filing. It should be adopted in writing before the year, with reimbursements actually flowing through the books on a regular cadence. When an S-corp owner tells me they've been "writing off the home office," the first thing I ask to see is the written plan and proof the reimbursements moved through the company during the year. Most of the time there's no plan, and you can't build one after December 31.
Depreciation recapture, if you own. Homeowners can include a slice of depreciation in the reimbursement, which is nice on the front end. But that reimbursed depreciation reduces your basis and comes back as unrecaptured Section 1250 gain, taxed up to 25%, when you sell. Claiming now can create a real headache later, so check with your CPA.
The California angle
California never conformed to the federal suspension. On your state return, using Form 540 Schedule CA, you can still deduct unreimbursed employee business expenses even though the federal side is dead.
Useful to know, but don't let it become your plan. The state deduction is the smaller number, and it only helps if you itemize in California. The real dollars are federal, and those still require the accountable plan. Treat the California deduction as a backstop, not a strategy.
The bottom line
If you run an S-corp and work from home, the home office deduction is real, but it lives entirely inside an accountable plan built on actual expenses and adopted in writing. The decision in front of you isn't "which method do I pick this April." It's "do I have a plan in place for the current year," because this one can't be fixed looking backward.
If you'd like a set of eyes on whether your setup actually holds up, or you need the plan built before the year gets away from you, reach out and let's talk it through.
This is general information, not tax advice for your specific situation. The rules shift and your particular facts matter. Talk with a CPA (ideally us) before you act on anything here.
