Home Office Deduction for S-Corp Owners: Accountable Plan vs. Nothing

You run your S-corp from a spare bedroom. You pay for the space every month in mortgage interest, utilities, insurance and internet. Then tax season arrives and your home office deduction is exactly zero.

For most S-corp owners, that is the default. Fixing it takes one page of paperwork and a few minutes a month.

Why S-Corp Owners Get Nothing by Default

If you own more than 2% of an S-corp and draw a paycheck, the tax code treats you as an employee of your own company. The old sole proprietor playbook (Form 8829, or the simplified $5-per-square-foot method covered in our home office deduction guide) does not apply to you anymore.

Employee business expenses are no longer deductible on your personal return. That rule came in with the 2017 tax reform and was made permanent in 2025. Your home office costs are not deductible on your personal return, and your company cannot deduct them either, because it never paid them.

So you spent real money on a real office and got no deduction. That is the “nothing” in this comparison.

The Fix: An Accountable Plan for Your S-Corp

An accountable plan is a written arrangement where your company reimburses you for business expenses you paid personally. Reimbursements under a qualifying plan are deductible by the company and are not wages to you. No income tax withholding, no payroll tax.

The IRS requires three things:

• Business connection. The expense must relate to the company’s business, such as the part of your home used exclusively and regularly for work.
• Substantiation. You document the amount, date and purpose within a reasonable time. Sixty days is the usual safe harbor.
• Return of excess. If the company advances more than you spent, you give the extra back within a reasonable time.

What the Numbers Look Like

Say your home is 2,400 square feet and your dedicated office is 240. That is a 10% business-use share.

Here is how three approaches compare for that $3,600 of home office cost:

At a 24% federal bracket, the accountable plan saves about $864 a year. Here is how that scales:

The savings grow with a bigger office, higher home costs or a higher bracket. Your own figures will differ.

How to Set Up the Plan Without Getting It Wrong

Most accountable plans fail on execution, not on the idea. Follow these steps:

1. Adopt it in writing. A short corporate resolution or plan document that states the three requirements is enough. Date it.
2. Reimburse, do not recharacterize. Do not cut your salary and replace the difference with “reimbursements.” The IRS has said a plan like that does not qualify. Set your salary first (see the reasonable compensation rules), then layer the plan on top.
3. Keep a simple expense report. A monthly or quarterly sheet showing the square footage percentage, the costs and the receipts is plenty.
4. Pay from the company account. Reimburse yourself by check or transfer, and record it as a reimbursement, not payroll.
5. Do not double dip. If you itemize and deduct mortgage interest or property taxes on Schedule A, only the portion not reimbursed by the company belongs there.

One more point on exclusive use. The space has to be used regularly and exclusively for business, so a desk in the living room or the kitchen table does not count. A dedicated room or a clearly defined section does.

Run Your Own Numbers

The home office deduction for S-corp owners is a small piece of a bigger question: is the S-corp structure paying off for you at all? Salary, distributions, payroll tax and reimbursements all interact.

Use our LLC to S-Corp calculator to see where you land, then put an accountable plan in place before year-end. An accountable plan is the difference between the “nothing” you get today and a deduction you can defend.