Paying Business Expenses Out of Pocket? How Your S-Corp Should Reimburse You
If you own an S-corporation, there's a good chance you're paying business costs out of your own pocket every month without even thinking about it. The client lunch on your personal card. The 40-minute drive to a job site in your own car. The corner of your house where you actually run the business. Add it up and it's real money — often several hundred dollars a month.
Here's the problem: if you never get paid back, that deduction is simply lost. Unreimbursed employee expenses aren't deductible on your personal return anymore — period. And if you "pay yourself back" by moving money from the business account to your personal account with no paperwork, you haven't fixed anything. You've just taken a distribution, and the corporation still gets no deduction.
The fix is something called an accountable plan, and setting one up is one of the easiest wins available to an S-corp owner. Here's how it works.
What an accountable plan is (and why it matters)
An accountable plan is a reimbursement arrangement between your corporation and you, its employee. And yes — as we covered in our post on reasonable compensation, you are an employee of your own S-corp. That's exactly why these rules apply to you. (The special "2% shareholder" wrinkles that complicate health insurance and certain fringe benefits do not disqualify ordinary expense reimbursements. This is regular-employee territory.)
For a reimbursement to stay tax-free, the plan has to meet three requirements:
Business connection — the expense must be one the corporation could deduct itself, incurred by you while working for the corporation.
Substantiation — you must account to the corporation for the amount, date, place, and business purpose, within a reasonable time.
Return of excess — if the corporation advances you more than you substantiate, you must pay the difference back within a reasonable time.
What counts as a "reasonable time"? The IRS gives a safe harbor called the fixed-date method: an advance can be paid within 30 days of when the expense is paid or incurred, substantiation is due within 60 days after, and any excess must be returned within 120 days after. There's also a periodic-statement method — the corporation sends statements at least quarterly and you have 120 days to respond — but in practice, most small S-corps just reimburse after the fact, once you've already spent the money and turned in the receipts. Do it that way and the return-of-excess rule mostly takes care of itself.
Fail any of the three rules and you have a non-accountable plan, which is a polite way of saying "wages." The reimbursement goes on your W-2, gets run through withholding, and both you and the corporation pay FICA on it. One more trap: the corporation can't just carve a slice out of your existing salary and relabel it "reimbursement." The IRS addressed exactly that move in Rev. Rul. 2012-25 — reimbursements have to be paid on top of your normal compensation and tied to real, substantiated expenses.
Do it right, and the payoff is clean: the corporation deducts the expense on its Form 1120-S, you report nothing on your personal return, and nobody pays payroll tax on a dime of it.
Which expenses should you be submitting?
Four categories cover most owners.
Business mileage in your personal car. The corporation reimburses you at the IRS standard mileage rate. For 2026 there are two: 72.5 cents per mile for miles driven January 1 through June 30 (Notice 2026-10), and 76 cents per mile for miles driven July 1 through December 31 after a mid-year increase (IR-2026-29). Your log's dates tell you which rate applies to each trip. Your substantiation is a mileage log: date, destination, business purpose, and miles. Keep it simple — a phone app or a notebook in the console both work. Two cautions. First, know where your business miles start. If your home office qualifies as your principal place of business, trips from home to clients and job sites are business miles. If you also have a regular office elsewhere, the drive there is commuting and never counts — no matter what's in the trunk. Second, it's one method or the other: if the corporation reimburses your mileage on a personally owned car, you don't also claim depreciation or actual costs on that vehicle. The depreciation strategies we walked through in the heavy SUV post apply when the corporation owns the vehicle. (The corporation can reimburse actual vehicle costs instead of the standard rate, but for most owners the standard rate is simpler — see the SUV post if you're weighing a company-owned vehicle instead.)
Your home office. This is the big one most owners leave on the table—and the one with the most tests to pass. Under §280A(c)(1), the space has to meet all of the following requirements:
Regular use. You use it for business on a continuing basis. Occasional or incidental use doesn’t count, even if the room is used for nothing else.
Exclusive use. The space is used only for business. It doesn’t have to be walled off—a defined corner of a room works—but any personal use fails the test. If the family also watches TV in your “office,” it doesn’t qualify.
It’s your principal place of business, a place where you regularly meet clients, or a separate structure. Most owners qualify under the first option: the office is where you handle administrative or management work for the business, and you have no other fixed location where you can do that work. You won’t lose the deduction just because you also do some administrative work on the road, at a client’s site, or at your main office, as long as there’s a reason you can’t perform some aspect of your administrative or management work at those locations and therefore need to do it in your home office—for example, taking business calls at night or performing work that is difficult to do at the main office. Meeting clients at home in the normal course of business qualifies on its own, as does a detached studio, garage, or barn used only for business.
Because you’re an employee of your corporation, there’s a fourth test in addition to those three: the office has to be for the convenience of the employer, not merely your own preference. The usual way to show this is for the corporation to document—in board minutes or a memo—that it doesn’t provide adequate office space at its main location for the work you need to perform at home. But the order of operations matters: that documentation doesn’t substitute for the first three tests. A home office that fails the regular-use or exclusive-use test isn’t rescued by a convenience-of-the-employer memo. Likewise, meeting the first three tests doesn’t eliminate the employer-convenience requirement.
What gets reimbursed? The business-use percentage of your home — office square footage divided by total square footage — applied to rent or mortgage interest, real estate taxes, utilities, insurance, HOA dues, and repairs, plus 100% of costs that are direct to the office itself (say, repainting that room). If you own the home, the corporation can also reimburse depreciation on the business-use portion of the house (the building, not the land), spread over the 39-year schedule that applies to business-use real estate — it's usually a modest monthly figure, but it adds up. One caveat: reimbursed depreciation reduces your basis in the home, so keep a running tally; that amount comes back as taxable gain when you eventually sell, and it isn't covered by the home-sale exclusion. Submit a simple worksheet monthly or quarterly. IRS Publication 587 walks through the percentage method if you want to see the mechanics. One coordination point: if the corporation reimburses part of your mortgage interest and property taxes, don't also deduct that same portion on Schedule A — it's been reimbursed.
One thing not to do: don't rent your home office to your S-corp. Under §280A(c)(6), an employee gets no home-office deduction for space rented to the employer — so the rent is taxable income to you with no home-office expenses to offset it. Reimbursement under an accountable plan is the right route. (And no, this isn't the same thing as the Augusta Rule — that's a short-term rental of your entire home for legitimate business meetings, not an ongoing office lease.)
Cell phone and home internet. Reimburse the business-use percentage of the actual bill, backed by the bill itself and a reasonable, consistent allocation method — a review of one representative month's usage, or hours worked, written down once and applied consistently. Don't reimburse 100% of a plan that's obviously a family plan. And a quirk worth knowing: the first residential landline in your home is never deductible (§262(b)), if you're one of the few who still has one. For recurring bills like these, the even simpler route is often to put the account in the corporation's name and have it pay directly, handling any personal-use portion separately.
Everything else you paid personally. Supplies, software subscriptions, client meals (deductible at 50% under §274(n)), business travel. On receipts: technically, the regulations don't require a receipt for most expenses under $75 — but that relief never applies to meals or lodging, and our advice is to keep every receipt anyway. It's a photo on your phone. Just take it.
A worked example: one owner, one month
Meet Dana, the sole shareholder-employee of a consulting S-corp here in Hamilton County.
Here's her August:
Item | Facts | Reimbursement |
Mileage | 340 business miles logged (all in August, so the second-half rate applies) | 340 × $0.76 = $258.40 |
Home office | 200 sq ft office ÷ 2,000 sq ft home = 10%; monthly home costs (mortgage interest $1,400 + property tax $350 + utilities $280 + insurance $120 = $2,150) | $2,150 × 10% = $215.00 |
Cell phone | $95 bill, 60% business use | $57.00 |
Internet | $80 bill, 50% business use | $40.00 |
Home office depreciation | Depreciable basis of the house (excluding land) $300,000 × 10% = $30,000; 39-year straight line | $30,000 ÷ 39 = $769.23 per year; ÷ 12 = $64.10 |
Supplies | Two receipts totaling $63.40 | $63.40 |
Total | $697.90 |
On September 5th, Dana submits a one-page expense report with her mileage log, home-office worksheet, and receipts attached. The corporation pays her $697.90 from the business checking account (memo line: "Expense reimbursement — August") and books the amounts to the matching expense accounts — auto, office, telephone, supplies. Not payroll. Dana's W-2 is untouched, the corporation deducts $697.90, no payroll tax is due, and Dana notes the $64.10 of depreciation in her home-basis file.
Now the alternative: suppose Dana skips the paperwork and just transfers $697.90 to her personal account. That's a distribution. The corporation deducts nothing, so its income — and Dana's K-1 — is $697.90 higher, and the transfer reduces her stock basis on top of it. Same dollars, worse result — the paperwork is the whole difference.
Your documentation checklist
A written accountable plan adopted by the corporation. The regulation doesn't strictly require it in writing, but a written plan is what proves the arrangement exists — ask us for our template.
A monthly or quarterly expense report, signed and dated by you.
A mileage log: date, destination, business purpose, miles.
A home-office worksheet: square footage, business percentage, each cost with the bill attached, and a depreciation line with the home's depreciable basis and a running total of depreciation reimbursed.
Phone and internet bills with the allocation percentage noted — and the method written down once.
Receipts for everything (a photo is fine); lodging receipts always.
Reimbursements paid from the business account, coded to expense accounts — never through payroll, never netted against distributions.
If you use advances, return any excess within 120 days.
The bottom line
You're already spending this money. The only question is whether the deduction gets taken or gets lost. Submit it, document it, and pay it back from the business account — and every one of those out-of-pocket dollars becomes a clean corporate deduction with zero tax to you.
If you'd like our accountable plan template and expense-report form, reach out — we'll set it up alongside your payroll so reimbursements never touch your W-2. And if you're deciding between mileage reimbursement and a company-owned vehicle, or wondering how the Augusta Rule fits in , those posts pick up where this one leaves off.
This article is for general information and isn't tax advice for your specific situation. Schaaf CPA Group can help you evaluate whether this strategy fits your circumstances.
