Accountable Plans and Reimbursing Yourself Correctly

An accountable plan is the paperwork that lets your corporation reimburse you tax-free for business expenses you pay out of your own pocket — home office costs, mileage, supplies, a business phone line — instead of those costs simply disappearing. If you set it up correctly, the company deducts the reimbursement and you don't report it as income. If you skip it or do it loosely, the same payment becomes taxable wages, subject to income tax withholding and payroll tax on both sides.

Why this suddenly matters once you're an employee of your own corporation

If you've made an S-corp election (or you run a C-corp) and you're paid a W-2 salary as an employee of your own company, you are, for tax purposes, an employee — not a sole proprietor. Sole proprietors deduct their business expenses directly on Schedule C, dollar for dollar, without any of this. Employees do not have that option. Federal tax law used to let employees deduct some unreimbursed job expenses as a miscellaneous itemized deduction; the 2017 tax law suspended that deduction, and 2025 legislation made the elimination permanent for most employees. In practical terms: if you personally pay for a home office, business mileage, or supplies and your corporation never reimburses you, that money is simply gone — no deduction for you, no deduction for the company, nothing to show for it at tax time.

An accountable plan is how you fix that. It shifts those costs onto the company's books as ordinary, deductible business expenses, and it keeps the reimbursement out of your taxable wages.

If you're a sole proprietor or a single-member LLC taxed as a disregarded entity, and nobody — including you — is an employee, you don't need any of this. You just deduct your business expenses on Schedule C. (Remember that an LLC has no tax classification of its own: a single-member LLC is a disregarded entity by default, a multi-member LLC is a partnership by default, and either one can elect S-corp or C-corp taxation. Forming the LLC is a state-law liability step; the tax classification is a separate federal question.) Accountable plans exist to solve a problem that only arises once someone is an employee receiving reimbursements from an employer — most commonly, an owner who elected S-corp taxation and now draws a salary.

The three legal requirements

The rules governing accountable plans come from Internal Revenue Code section 62(c) — part of the tax code's definition of "adjusted gross income" — and Treasury Regulation section 1.62-2. To qualify as an accountable plan, a reimbursement arrangement must satisfy all three of these:

1. Business connection. The expense must be one the company could otherwise deduct, and it must be paid or incurred by you in the course of doing your job for the company — not a personal expense dressed up as a business one.
2. Adequate substantiation within a reasonable time. You have to account to the company for the amount, date, place, and business purpose of each expense, generally backed by receipts or a mileage log, and you have to do it promptly — not months or years later.
3. Return of any excess. If the company advanced you more than you actually spent (say, a travel advance), you have to return the unspent balance within a reasonable time. Money you're allowed to simply keep, no questions asked, isn't a reimbursement — it's pay.

"Reasonable time" isn't a fixed calendar date — it depends on the facts. But the regulations offer safe harbors. Under the fixed-date method, substantiating an expense within 60 days after it was paid or incurred, and returning any excess advance within 120 days after it was paid or incurred, is automatically treated as timely. There's also a periodic-statement alternative: if the company gives you a statement at least quarterly showing any unsubstantiated amounts and asking you to substantiate or return them, and you do so within 120 days of that statement, that counts as reasonable too. You don't have to use either safe harbor — but building your routine around one of them is the easiest way to stay safely inside the rules.

Get it wrong and it becomes wages

This is the part owners tend to miss. If you reimburse yourself for something with no real business connection, if you never actually document the expenses, or if you (or the company) let unsubstantiated advances sit unreturned, the arrangement fails the accountable-plan test — and the consequence isn't a slap on the wrist. Amounts that don't meet all three requirements are treated as paid under a nonaccountable plan, which means they go on your W-2 as wages, subject to income tax withholding and both halves of Social Security and Medicare tax (the company owes the employer share, and your share comes out of the payment). And because the miscellaneous itemized deduction is gone, you generally can't deduct the underlying expense on your personal return to offset it. A casual habit of writing yourself a "reimbursement" check for round, undocumented amounts is one of the more common ways owner-employees accidentally create extra payroll tax liability for themselves.

What to do: setting up an accountable plan

1. Adopt a simple written plan. The law doesn't require a written document, but you should have one anyway — it's your evidence that the arrangement is real and it tells you (and any future accountant, or the IRS) exactly what's covered. A short written policy or board resolution is enough for a small corporation. It should state that the company will reimburse ordinary and necessary business expenses (naming the categories you actually expect — mileage, home office, supplies, business travel, tools), that expenses must be substantiated within a set number of days, and that any excess advance must be returned within a set number of days.
2. Use a real expense report, on a regular schedule. Monthly is typical for a small company. For each item, record the date, the amount, the business purpose, and who or what it was for, and attach the receipt or log. A spreadsheet is fine. What matters is that it exists, it's contemporaneous (close in time to when the expense happened), and the company actually reviews and pays it — this shouldn't be something you invent at tax time from memory.
3. Have the company issue reimbursement separately from payroll. Pay it as a distinct reimbursement, not folded into your paycheck as extra "pay" — keeping it clearly labeled and separate is part of what makes it a reimbursement rather than wages in substance. Watch out in particular for any arrangement that quietly reduces your salary by the amount it "reimburses": the regulations treat wage recharacterization as a failed plan.
4. Keep the records. Retain the expense reports and receipts with your other business tax records. If the IRS ever questions the arrangement, this substantiation is what proves it was accountable.

The home office reimbursement

An employee generally can't claim the home-office deduction that a sole proprietor uses on Schedule C — that method is built for Schedule C filers, and the employee version was a miscellaneous itemized deduction that no longer exists. What an owner-employee can do instead is have the corporation reimburse the business-use share of actual home costs under the accountable plan.

Two conditions matter here, and they're easy to gloss over:

• Exclusive and regular use. The space has to be used regularly and only for the company's business — a desk in the corner of a room that doubles as the family den generally doesn't qualify.
• Convenience of the employer. For an employee, the home office has to exist for the employer's convenience, not merely because working from home is nicer. When you are both the owner and the employee, this is worth documenting honestly — say, that the company has no other office.

The mechanics: figure the percentage of your home used for company business, apply that percentage to your actual recurring costs (rent, utilities, renter's or homeowner's insurance, and similar), and reimburse that amount, backed by your calculation and the underlying bills. Whether and how to include mortgage interest, property taxes, or depreciation is genuinely more complicated — those items interact with your personal itemized deductions and, in the case of depreciation, with recapture when you eventually sell the home. Ask your CPA before you include them rather than assuming.

One trap worth naming: don't try to solve this by having the corporation rent the home office from you. The tax code specifically denies the deduction for an employee who rents part of their home to their employer, so that structure defeats the very deduction it's reaching for. The accountable-plan reimbursement is the route that works.

Mileage: standard rate or actual costs

When you use your personal vehicle for company business, the corporation can reimburse you one of two ways:

• Standard mileage rate. Track your business miles with a log (date, destination, business purpose, miles driven) and the company reimburses you at the IRS standard mileage rate. That rate is adjusted every year, so don't rely on a number you remember from a prior year — confirm the current-year rate on irs.gov before you calculate a reimbursement. Reimbursing above the standard rate without substantiating actual costs turns the excess into wages.
• Actual expenses. Track your actual vehicle costs — gas, insurance, repairs, depreciation or lease payments — and reimburse the business-use percentage of those actual costs, backed by a mileage log showing what portion of your driving was for business.

Either method works under an accountable plan as long as it's substantiated with a contemporaneous log and applied consistently. Ordinary commuting between your home and a regular workplace is personal, not business, and reimbursing it is compensation.

A few things to keep in mind

• This is a federal income and payroll tax tool — it comes from federal tax law, so the rule itself doesn't change from state to state. State income tax treatment usually follows the federal result, but states don't all conform to federal tax law in the same way; if your state has an income tax, confirm with your CPA or your state tax agency.
• The accountable plan covers reimbursements for expenses you personally paid on the company's behalf. It's a different mechanism from the company simply paying a business vendor directly (a business credit card in the company's name, for example, isn't a "reimbursement" issue at all — though the company still needs the receipts and the business purpose).
• If you already have a business structure and payroll set up but have never formalized reimbursements, this is a good year-end or new-fiscal-year cleanup item — talk to your CPA or payroll provider about adopting a written plan going forward. Don't try to retroactively "reimburse" yourself for expenses from a long-closed prior year; the substantiation and reimbursement are supposed to track close in time to when you actually incurred the cost.
• Partners in a partnership are not employees of the partnership, and how a partner's out-of-pocket costs are handled depends on the partnership agreement. If you're a partner rather than a W-2 owner-employee, that's a conversation to have with your CPA rather than a matter of copying an employee expense policy.
• An accountable plan is about reimbursements. It doesn't change the separate requirement that an S-corp owner who works in the business be paid reasonable compensation as W-2 wages — you can't dress salary up as expense reimbursement to avoid payroll tax, and the regulations are written to catch exactly that.

Where to read the official rules

• IRS Publication 463, Travel, Gift, and Car Expenses — the accountable-plan requirements, the reasonable-period safe harbors, and the substantiation rules for mileage and travel.
• IRS Publication 587, Business Use of Your Home — the exclusive-use, regular-use, and convenience-of-the-employer standards.
• IRS Publication 15 (Circular E), Employer's Tax Guide — how reimbursements are treated for withholding and payroll tax purposes.
• Free help is available: the IRS Small Business and Self-Employed pages at irs.gov, and no-cost counseling through SBA local assistance, SCORE, and your state's Small Business Development Center.

Frequently asked questions

Do I legally have to have a written accountable plan document?

No specific form is required by law, but you should have something in writing — a short policy or board resolution — describing what's reimbursed and the substantiation and return-of-excess timing. It's your proof that the arrangement is real if it's ever questioned, and it keeps you consistent from month to month.

Can I set this up for expenses from last year?

Be cautious here. Substantiation and reimbursement are supposed to happen within a reasonable time of the expense — that's one of the three legal requirements. Reimbursing a large batch of old, undocumented expenses well after the fact is exactly the pattern that can cause an arrangement to fail the accountable-plan test. Set the plan up going forward and talk to your CPA about how to handle anything from a prior year.

Does this only apply to S-corps?

No. It applies to any employer-employee relationship, including a C-corp owner-employee and any regular employees you have. It matters most for S-corp owners because that's the most common situation where a small business owner suddenly becomes their own company's W-2 employee.

What if the company reimburses me more than I actually spent?

You have to return the excess within a reasonable time (the 120-day safe harbor is a good target). If you keep it instead, that amount is treated as wages and becomes subject to income tax withholding and payroll taxes.

Can I still deduct anything on my personal return if the company doesn't reimburse me?

Generally, no — the deduction employees used to claim for unreimbursed job expenses was suspended by the 2017 tax law and the elimination was made permanent in 2025 for most workers. A few narrow categories are treated differently, including certain educators, Armed Forces reservists, qualified performing artists, and some fee-basis state or local officials. For an owner-employee, an accountable plan reimbursement is the practical way to avoid losing the deduction entirely.

Can my corporation just rent my home office from me instead?

That's a common idea, and it backfires. The tax code disallows the home-office deduction where an employee rents a portion of the home to their employer, so the rent route doesn't get you the deduction you're after — and you'd have rental income to report. Reimburse under the accountable plan instead, and check the structure with your CPA.

This is general information, not legal, tax, or financial advice, and using this page doesn't create an attorney-client or accountant-client relationship. Tax figures and rates change — confirm current rules and amounts on irs.gov, and talk to a qualified CPA or tax professional about setting up a plan for your specific business.