If you own an insurance agency — or any small business — taxed as an S corporation and you're covering mileage, your home office, or your cell phone out of your own pocket, there's a strong chance you're losing those deductions entirely. Since the 2017 Tax Cuts and Jobs Act, and now permanently under the 2025 tax law (the One Big Beautiful Bill Act), employees can no longer write off unreimbursed business expenses on their personal return. And as an S-corp owner, the IRS treats you as an employee of your own company.

The fix is an accountable plan: an IRS-sanctioned arrangement that lets your S corp reimburse you for legitimate business costs, deduct those reimbursements, and put the money in your pocket completely tax-free. This guide walks through what an accountable plan is, what qualifies, how to set one up step by step, and where to grab a ready-to-use S-corp accountable plan template so you can put yours in place this week.

What is an accountable plan for an S-corp?

An accountable plan for an S corp is a written reimbursement arrangement that meets three IRS requirements. When it does, the reimbursements your business pays you are deductible to the company and excluded from your taxable wages — they never show up on your W-2. Get any of the three requirements wrong and the IRS treats the payments as taxable compensation.

Under Treasury Regulation §1.62-2, a valid accountable plan must satisfy all three of these rules:

• Business connection. The expense must have a genuine business purpose and be incurred while you're performing services for the company.
• Substantiation. You must document each expense — the amount, date, place, and business purpose — within a reasonable period of time.
• Return of excess. If the company advances you money, you must pay back anything above your substantiated expenses within a reasonable period.

Why does this matter so much for S-corp owners specifically? Because you can't simply deduct business costs you paid personally. A sole proprietor files a Schedule C and writes those expenses off directly. As an S-corp owner-employee, you have no such option — and the deduction for unreimbursed employee expenses is now permanently off the table. The accountable plan is the bridge that moves those costs onto the business return where they belong. (For the bigger-picture case, see our companion post on why every S-corp owner needs an accountable plan.)

What expenses qualify under an accountable plan?

Any ordinary and necessary business expense you personally pay for can be reimbursed under an accountable plan, as long as you can substantiate it with a business purpose. For most agency owners and small-business S-corps, the most valuable categories are the ones that are otherwise easy to lose.

Common reimbursable expenses include:

• Home office — the business-use share of rent or home operating costs (more on this below)
• Vehicle and mileage — business miles driven in your personally owned vehicle, reimbursed at the IRS standard rate or actual cost
• Cell phone and internet — the percentage used for business
• Business travel, lodging, and meals — with meals generally reimbursed at 50%
• Continuing education, licensing, dues, and subscriptions
• Software, office supplies, and small equipment bought personally

The key distinction is business versus personal. Your monthly internet bill is partly reimbursable based on business use; your family's streaming subscriptions are not. Substantiation is what protects the deduction if the return is ever examined.

Can an S-corp owner reimburse home office expenses?

Yes — and for an S-corp owner, an accountable plan is the only clean way to do it. You can't use the simplified home office deduction or Form 8829; those belong to Schedule C filers. Instead, your S corp reimburses you for the business-use portion of your home expenses, deducts it, and you receive it tax-free.

The calculation starts with your business-use percentage — the square footage of your dedicated office divided by your home's total square footage. You then apply that percentage to qualifying home costs such as:

• Utilities (electric, gas, water)
• Homeowner's or renter's insurance
• Repairs and maintenance
• Rent, or an allocated share of mortgage interest and depreciation for owners

A quick example: a 200-square-foot office in a 2,000-square-foot home is 10% business use, so 10% of those eligible home costs can be reimbursed. The home-office allocation carries real nuances — depreciation recapture for homeowners, and coordination with mortgage interest you may already be itemizing — so it's worth having a tax professional confirm your numbers before you set the reimbursement amount.

What is the IRS accountable plan mileage reimbursement rule?

Under an accountable plan, your S corp can reimburse you for business driving using one of two methods: the IRS standard mileage rate or your actual vehicle costs. As long as you keep a contemporaneous mileage log and stay at or below the standard rate, the reimbursement is tax-free to you and fully deductible to the business.

For 2026, the IRS standard mileage rate is 72.5 cents per mile for business use — up 2.5 cents from the 70-cent rate in 2025 (IRS Notice 2026-10). To reimburse this way, you log every business trip with the date, destination, business purpose, and miles driven, then the company pays you miles × the standard rate. Commuting between home and a regular office doesn't count as business mileage.

The alternative is reimbursing actual costs — gas, insurance, repairs, and depreciation — multiplied by your business-use percentage, supported by receipts. The standard rate is simpler and is the right choice for most agency owners; actual cost can win for expensive vehicles with heavy business use. Either way, the mileage log is what makes the reimbursement defensible.

How do you set up an accountable plan step by step?

Setting up an accountable plan is straightforward and doesn't require filing anything with the IRS — the plan is an internal company document. Here's the process from start to finish:

1. Put it in writing. Adopt a formal written accountable plan and approve it with a corporate resolution. This is the single most important step, and where a ready-made template saves you the most time.
2. Define what's covered. Spell out which expense categories are reimbursable and which method applies (for example, the standard mileage rate for vehicles).
3. Track and substantiate. Use a simple expense report where you record the amount, date, place, and business purpose of each cost, with receipts and mileage logs attached.
4. Reimburse within a reasonable time. The IRS safe harbor treats substantiation within 60 days and the return of any excess advance within 120 days as reasonable.
5. Reimburse it through payroll, tax-free. Run the reimbursement through payroll the same way any employee would submit an expense or receipt to be paid back by the business — but coded as a non-taxable reimbursement, not as wages. It appears on your paystub as an expense reimbursement from the company, while staying out of your taxable wages and off your W-2. Keep it separate from owner distributions and code it to the correct expense accounts.
6. Record it correctly. The reimbursements are deducted as business expenses on your Form 1120-S. They should never appear as wages on your W-2.
7. Keep your documentation. Retain the signed plan, expense reports, and receipts in case the return is ever reviewed.

Common mistakes that void an accountable plan

An accountable plan is easy to set up but also easy to break. Most problems trace back to a few avoidable errors:

• No written plan. A verbal understanding isn't enough — without documentation, the IRS can treat every reimbursement as taxable wages.
• Running reimbursements through payroll as taxable wages, or blending them with owner distributions, instead of coding them as a separate non-taxable reimbursement.
• Round-number estimates with no receipts or logs behind them.
• Reimbursing personal costs that lack a real business purpose.
• Never returning excess advances within the reasonable-time window.

Get the free S-Corp Accountable Plan template

The hardest part of getting started is the written plan itself — so we built one you can use. Download our free S-Corp Accountable Plan template, fill in your company details, approve it with a resolution, and you'll have a compliant plan in place in minutes rather than starting from a blank page.

Make sure your accountable plan is actually saving you money

A template gets the plan on paper, but the savings come from running it correctly month after month — setting the right reimbursement amounts, capturing every eligible expense, and recording it cleanly on your books and your 1120-S. That's exactly the kind of thing we handle for insurance agency owners every day.

If you'd like a professional to set up your accountable plan, dial in your home-office and vehicle reimbursements, and make sure nothing is slipping through, take a look at Club Capital's tax services. We'll help you keep more of what you earn — the right way.

This article is for general educational purposes and is not tax advice for your specific situation. Tax rules change and depend on individual circumstances, so consult a qualified tax professional before setting up or relying on an accountable plan.