Reimbursing an S Corp Owner: How Accountable Plans Work
How an S corporation pays back an owner's home office, phone, and mileage without creating taxable wages.
Reviewed by the Fairlight Accounting cross-border tax team — U.S. & Canadian Tax Desks
An accountable plan is a written reimbursement arrangement that lets a business pay employees — including S corporation owners — back for business expenses without the payment counting as wages. It must require a business connection, timely substantiation, and return of any excess. Reimbursements that meet those rules are deductible to the company and tax-free to the employee.
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Why does an S corporation owner need one?
An S corporation owner who works in the business is an employee of the corporation. Since 2018, employees cannot deduct unreimbursed business expenses on their personal return, and the 2025 tax law made that change permanent. If you pay for a home office, a phone, or business mileage personally and the corporation never reimburses you, the deduction is simply lost.
An accountable plan fixes that. The corporation reimburses you, deducts the reimbursement, and you receive the money tax-free.
What are the three requirements?
| Requirement | What it means | Common safe practice |
|---|---|---|
| Business connection | The expense was paid or incurred while performing services for the employer | Reimburse only ordinary and necessary business costs |
| Substantiation | The employee accounts for the expense within a reasonable period | Submit receipts or a mileage log within 60 days after the expense is paid or incurred |
| Return of excess | Any advance or allowance above substantiated costs is returned | Return excess within 120 days after the expense is paid or incurred |
An arrangement that does not require all three is a nonaccountable plan, and every payment under it is taxable wages, subject to withholding and payroll tax. Even under a valid plan, any amount not substantiated or not returned within a reasonable period is treated as paid under a nonaccountable plan. The 60- and 120-day periods are safe harbors under Treas. Reg. §1.62-2(g); alternatively, the company can send a statement at least quarterly and allow 120 days to account for or return outstanding amounts.
What can an S corporation reimburse an owner for?
- Home office. The business-use percentage of rent or mortgage interest, property tax, insurance, utilities, repairs, and depreciation on an owned home. The office must meet the regular-and-exclusive-use test, and because the owner is an employee, that use must also be for the convenience of the corporation.
- Vehicle use. Business miles at the IRS standard mileage rate, supported by a log. This is usually simpler than the corporation owning the car.
- Phone and internet. The business-use share of a personal plan.
- Travel and meals. Business travel and the deductible portion of business meals, substantiated the same way the IRS requires for any business.
- Supplies and subscriptions paid with a personal card.
A per diem allowance for travel, at or below federal rates, is generally treated as substantiated for the amount if time, place, and business purpose are documented. That shortcut does not fully protect an owner of more than 10 percent of the corporation's stock — which covers most S corporation owners — who must still be able to prove actual expenses to the IRS.
How do you set one up?
Adopt a short written plan by corporate resolution, describe which expenses qualify and the deadlines, and follow it. Each month or quarter, submit an expense report with receipts and logs; the corporation pays it from the business account and books it as an expense. Do not reimburse with round numbers or a fixed monthly "allowance" that ignores actual costs.
Frequently asked questions
Can a single-member S corporation have an accountable plan?
Yes. The owner is still an employee of the corporation, and the plan works the same way. Approve it formally and keep the expense reports, even though you are approving your own reimbursements.
Does the reimbursement show up on my W-2?
No. Payments under an accountable plan are excluded from wages and do not appear on Form W-2. Payments under a nonaccountable plan do.
What if I forgot to submit expenses for most of the year?
Expenses must be substantiated within a reasonable period — the safe harbor is 60 days after the expense is paid or incurred. Catching up on stale expenses months later weakens the plan. Start a regular cycle now and reimburse current expenses on time.
Is an accountable plan useful for sole proprietors?
Not usually. A sole proprietor deducts business expenses directly on Schedule C. The plan matters when the owner is an employee of their own corporation.
Official sources
The IRS explains: “You must pay back the amount of any reimbursement or other expense allowance for which you don’t adequately account or that is more than the amount for which you accounted.” — Internal Revenue Service, Publication 463 (2025), Travel, Gift, and Car Expenses, https://www.irs.gov/publications/p463
The IRS explains: “Amounts paid under an accountable plan aren’t wages and aren’t subject to income, social security, Medicare, and FUTA taxes.” — Internal Revenue Service, Publication 15 (2026), (Circular E), Employer’s Tax Guide, https://www.irs.gov/publications/p15
Next step
Fairlight Accounting handles U.S. domestic, cross-border (U.S.–Canada), and international tax returns, plus bookkeeping, payroll, and CFO advisory. Our U.S. Tax Desk drafts accountable plans for S corporation owners and books the reimbursements correctly each month. See pricing or book a free fit call.
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