The Accountable Plan: How S Corp Owners Reimburse Themselves Without Losing the Deduction

Short answer up front. If you own an S corporation and you pay business expenses with your own money, you need a written accountable plan so the company can reimburse you. Without one, nobody gets the deduction: not the company, because it never paid the expense, and not you, because the personal deduction that used to catch those costs is now permanently gone.

That last part is new, and it's the reason I'm writing this now rather than next spring.

I've been a CPA for more than 23 years, and my firm works with more than 70 marketing and advertising agency owners every month. The number of owners running real money through personal credit cards without a reimbursement policy is higher than you'd guess. It's usually the most expensive paperwork problem in the business, and it's also the easiest one to fix. Not having a plan in place can cost you tens of thousands of dollars in an examination, and that's a bigger number than the deduction you lost.

What Changed in 2026, and Why Waiting Stopped Working

For a long time there was a backstop. If you paid something for the business and never got reimbursed, you could sometimes deduct it personally as an unreimbursed employee expense, subject to a 2% floor.

The 2017 tax law suspended that category through 2025. Most owners, and honestly a lot of accountants, treated that as temporary and planned to pick it back up in 2026.

It isn't coming back. Section 70110 of the One Big Beautiful Bill Act made the suspension permanent for tax years beginning after December 31, 2025. The only survivor is a narrow category for K-12 educators, which does nothing for you.

So here's the position you're actually in this year. In an S corporation, you're an employee of your own company. Money you spend on the company's behalf is the company's expense, not yours. If the company never reimburses you, that deduction doesn't get deferred or moved. It evaporates.

That's the whole reason an accountable plan stopped being good hygiene and became the difference between deducting something and not.

What Is an Accountable Plan?

It's a written company policy stating that employees will be reimbursed for business expenses they incur, provided they follow the rules.

When it's set up properly, three things happen at once:

• The company deducts the full expense, because the company actually paid it.
• The reimbursement isn't taxable income to you. It's not compensation, it's repayment.
• Nothing hits your W-2, so there's no Social Security or Medicare tax on it for you or the company.

That third point is what makes this better than the obvious alternative. If you simply pay yourself more salary to cover what you've been spending, that raise carries income tax and payroll tax on both sides. A reimbursement carries neither. Same cash leaving the business, materially different result.

What Are the Three Requirements?

The rules live in Treasury Regulation 1.62-2, and there are exactly three. Fail any one and the IRS can recharacterize every reimbursement as wages, which means back payroll tax and amended returns.

1. Business connection. The expense has to be a genuine business expense you incurred while performing services for the company. Not "business-ish." Connected.

2. Substantiation. You have to document each expense within a reasonable period: amount, date, place, and business purpose. This is where most plans die. A credit card statement is not substantiation. It proves what you spent and says nothing about why, and "why" is the part being tested.

3. Return of excess. If the company advances or allowances you money and you don't spend all of it on business, you return the difference within a reasonable period. Owners routinely fail this one by advancing themselves round numbers and never squaring up.

Get all three and the arrangement is accountable. Miss one and it's a nonaccountable plan, which is just a confusing way of paying yourself wages.

The 2026 Mileage Trap Nobody Is Talking About

This one is going to catch a lot of companies, because it depends on a change the IRS almost never makes.

The IRS adjusted the standard business mileage rate mid-year in 2026:

Both figures come from the IRS standard mileage rates page.

If your accountable plan reimburses mileage at a single flat rate for the whole year, you're now wrong in one direction or the other, and both directions cost you:

• Reimburse above the applicable rate and the excess isn't a reimbursement at all. It's taxable wages, and it should be running through payroll.
• Reimburse below it and you've left your own money inside the company for no reason.

The fix is unglamorous. Split your mileage log at June 30 and apply each rate to its own period. If you've already reimbursed the entire year at 72.5 cents, you owe yourself a true-up for the second half, and you can still do it inside the year.

Should You Rent Your Home Office to Your Corporation?

No. This is the single most common piece of bad advice I have to undo, and it's expensive because it fails twice.

There's a provision, IRC Section 280A(c)(6), that specifically disallows the home office deduction when an employee rents space to their employer. Do it anyway and you create taxable rental income on your personal return while the corporation's deduction gets disallowed. You've manufactured income and lost a deduction in the same transaction.

Reimburse the home office through the accountable plan instead. Calculate the business-use percentage of your home, apply it to your actual costs (mortgage interest or rent, utilities, insurance, repairs), and have the company reimburse that amount against documentation.

One important clarification, because you may have read our piece on the Augusta Rule and think these conflict. They don't. The Augusta Rule is Section 280A(g), which lets you rent your residence to the business for up to 14 days a year for genuine business use like a planning session. That's a real strategy and it still works. Renting home office space to your employer on an ongoing basis is Section 280A(c)(6), and that one's disallowed. Different provisions, opposite answers. Use the first, avoid the second, and don't try to stack them on the same space.

What Belongs in the Plan?

The document itself is short. What matters is that it's adopted, dated, and followed.

• Who's covered (all employees, including owner-employees)
• What categories are reimbursable: mileage, travel, meals, home office, professional dues, phone and internet, equipment
• The substantiation standard and the submission deadline
• The return-of-excess requirement and its deadline
• How mileage is reimbursed, and at which rate for which period

Then operate it. Adopt it in your corporate minutes. Set a monthly submission cadence, because quarterly turns into a year-end scramble and year-end scrambles are where substantiation gets invented rather than documented.

Who This Isn't For

Partners in a partnership. This isn't your rule. Partners have a separate route, unreimbursed partner expenses on Schedule E, and whether it's available turns on what your partnership agreement says about reimbursement. If your agency is an LLC taxed as a partnership, the unreimbursed partner expense rules apply instead, and whether they're available turns on what your partnership agreement says about reimbursement. Trying to apply the S corp answer there is a fast way to lose the deduction.

Sole proprietors and single-member LLCs with no S election. You don't need a reimbursement policy to deduct your own business expenses. You just deduct them.

Anyone hoping this fixes prior years retroactively. An accountable plan works going forward. You can't paper a reimbursement policy over expenses from three years ago and expect it to hold.

What to Do This Week

1. Adopt a written plan and reflect it in your corporate minutes.
2. Pull your personal card statements for this year and find the business expenses nobody reimbursed. Most owners find a meaningful number, and if you're still inside the tax year, it's fixable.
3. Split your mileage at June 30 and true up the second half at 76 cents.
4. Set a monthly submission rhythm so this never becomes a December project again.

Filing a return isn't a tax strategy, and this is exactly why we tell owners not to wait until tax season to talk to us. This is one of those items where the entire outcome is decided before anyone opens a tax form, by whether a policy existed and whether you followed it.

Book a Free Tax Analysis and we'll look at what you've been absorbing personally and what it's costing you.

Let's talk.

Frequently Asked Questions

What is an accountable plan for an S corporation?

It's a written company policy under Treasury Regulation 1.62-2 under which the corporation reimburses employees, including owner-employees, for business expenses they pay personally. When the plan meets three requirements (business connection, substantiation, and return of excess), the company deducts the expense in full, the reimbursement isn't taxable to the employee, and it isn't reported on the W-2 or subject to payroll tax.

Can I still deduct unreimbursed business expenses on my personal return in 2026?

No. Section 70110 of the One Big Beautiful Bill Act made the suspension of miscellaneous itemized deductions permanent for tax years beginning after December 31, 2025. That category included unreimbursed employee expenses. If your S corporation doesn't reimburse you, there's no personal deduction to fall back on and the deduction is simply lost.

Does an accountable plan have to be in writing?

Practically, yes. There's no form to file, but the arrangement has to be demonstrable, and a written policy adopted in your corporate minutes is how you demonstrate it under examination. An unwritten understanding between you and your own corporation is a weak position to defend.

What is the 2026 standard mileage rate?

There are two. The business rate is 72.5 cents per mile from January 1 through June 30, 2026, and 76 cents per mile from July 1 through December 31, 2026. The IRS made a rare mid-year adjustment. If your plan reimburses at a single flat rate for the year, reimbursements above the applicable rate become taxable wages and reimbursements below it leave your money in the company.

Can I rent my home office to my S corporation?

No. IRC Section 280A(c)(6) disallows the deduction when an employee rents space to their employer, so you'd create taxable rental income for yourself while the corporation loses the deduction. Reimburse the home office through the accountable plan instead, based on the business-use percentage of your actual home costs. This is a different provision from the Augusta Rule, Section 280A(g), which permits renting your residence to the business for up to 14 days a year and does still work.

What happens if my plan fails one of the three requirements?

The arrangement becomes a nonaccountable plan. Reimbursements are then treated as wages: reportable on the W-2, subject to income tax withholding and payroll tax on both sides. That usually means amended payroll filings, so the cost of getting it wrong is larger than the cost of setting it up correctly.