Do I need an accountable plan for my S-Corp, and what does it cover?
Yes. Once you elect S-Corp status, you are an employee of your own company, and for 2026 and later the Code permanently bars employees from deducting unreimbursed work expenses. An accountable plan under Treas. Reg. 1.62-2 lets the S-Corp reimburse your mileage (72.5 cents per mile through June 30, 2026 and 76 cents after), home office, phone and internet tax-free and deduct the cost.
Yes. If you own an S-Corp and pay business costs out of your own pocket, you need an accountable plan.
Once you elect S-Corp status, you work for the corporation as an employee. For 2026 and later, employees cannot deduct unreimbursed work expenses on their personal returns, and the 2025 tax law made that permanent. An accountable plan is how the company pays you back for mileage, home office, phone and internet without the money counting as wages.
Who this applies to
- Owners of an LLC or corporation taxed as an S-Corp who also work in the business and take a W-2 salary.
- Owners who use a personal car, a room in their home, or a personal phone and internet for business.
- Owners who elected S-Corp status on their own and still track expenses the way they did on Schedule C.
Who it doesn't
- Sole proprietors and single-member LLCs taxed as sole proprietorships. These costs are deducted directly on Schedule C (Form 1040).
- Multi-member LLCs taxed as partnerships. Partners follow different rules for unreimbursed expenses, which this article doesn't cover.
- Costs the S-Corp already pays directly from its own account for purely business items. Those are company expenses with no reimbursement needed.
Why the deduction disappears after the election
On Schedule C, your car, home office and phone come straight off your business income. After the election, your business is the corporation, and you are its employee.
An employee's unreimbursed work expenses are miscellaneous itemized deductions. The 2017 tax law suspended those deductions for 2018 through 2025. Public Law 119-21 (the 2025 tax law) removed the end date, so Internal Revenue Code section 67(h) now bars them for every tax year beginning after December 31, 2017, with no sunset.
The verdict: if you pay it personally and the company doesn't reimburse you under a plan, nobody deducts it.
What makes a plan "accountable"
Treasury Regulation 1.62-2 sets three requirements. Miss any one and the payments are treated as made under a nonaccountable plan.
- Business connection. The plan can only pay for expenses that would be deductible business expenses, incurred while you perform services as an employee of the S-Corp. A flat monthly "expense allowance" paid whether or not you spend anything fails this test.
- Substantiation. You have to document each expense to the company within a reasonable period. The regulation says lumping costs into broad categories is not enough.
- Return of excess. If the company advances you more than you spend, you must give the excess back within a reasonable period.
The regulation gives a safe harbor for "reasonable period," called the fixed date method. Advances paid within 30 days of the expense, substantiation within 60 days, and any excess returned within 120 days are all treated as timely. A second option, the periodic statement method, has the company send you statements at least quarterly and gives you 120 days after each statement to substantiate or return the excess.
There is also an anti-abuse rule. If the arrangement shows a pattern of abuse, every payment under it is treated as nonaccountable, not just the bad ones.
What happens without one
Reimbursements under a nonaccountable plan are wages. They go in box 1 of your Form W-2, and they are subject to income tax withholding and payroll taxes.
The S-Corp still deducts the payment, but as compensation. You have turned a tax-free reimbursement into taxable salary.
If the company doesn't reimburse you at all, the cost simply stays personal and nondeductible.
What an accountable plan can cover
Anything that is an ordinary and necessary cost of your work for the S-Corp, substantiated and limited to the business share. For most owners, that means four items.
Mileage on a personal car. The company can reimburse business miles at the IRS standard mileage rate. For 2026, that rate is 72.5 cents per mile for miles driven January 1 through June 30, and 76 cents per mile from July 1 through December 31 (the IRS raised it midyear in Announcement 2026-11 because of fuel prices).
Home office. The company reimburses the business-use share of your home costs, such as rent or mortgage interest, property taxes, insurance, utilities and repairs. For an employee, section 280A(c)(1) adds a condition beyond regular and exclusive use: the space has to be used for the convenience of the employer. The file needs to show why the S-Corp needs the owner working from that space, such as the company having no other office.
Phone and internet. The business-use percentage of a personal phone plan and home internet. Base the percentage on a reasonable, documented allocation, not a round guess.
Other out-of-pocket costs. Travel, supplies, professional dues and similar costs you put on a personal card.
Two mistakes that undo the plan
Renting your home office to your S-Corp. Some owners try to have the company pay "rent" for the home office instead of a reimbursement. Section 280A(c)(6) says the home office exceptions don't apply to anything attributable to renting the space to your employer while you use it to perform services as an employee. The rent is income to you, and the home office deduction that would normally offset it is blocked. The reimbursement route is the one the Code supports.
Reimbursing in place of salary. The plan pays back real, substantiated expenses. Routing what should be salary through "reimbursements" fails the business connection test and invites the abuse rule.
A worked example
Hypothetical owner of a one-person consulting S-Corp, 2026. All figures are round and illustrative.
- Business miles: 3,000 from January through June, and 3,000 from July through December. Reimbursement: (3,000 × $0.725) + (3,000 × $0.76) = $2,175 + $2,280 = $4,455.
- Home office: a 200 square foot office in a 2,000 square foot rented home is 10% of the space. Rent and utilities total $30,000 for the year. Reimbursement: $30,000 × 10% = $3,000.
- Phone: $1,200 a year at 50% business use = $600.
- Internet: $900 a year at 50% business use = $450.
Total reimbursed under the plan: $4,455 + $3,000 + $600 + $450 = $8,505.
With an accountable plan, the $8,505 is not on the owner's W-2, and the S-Corp deducts it, which lowers the profit that passes through to the owner's return. Without a plan, the same $8,505 paid as a reimbursement is W-2 wages. If it isn't paid at all, it is a personal cost with no deduction.
How it changes for an S-Corp owner
This whole article is the S-Corp change. On Schedule C, these costs were deductions you claimed yourself. After the election, they are reimbursements the company pays you under a plan.
The plan is one of several pieces that make the election work, along with a reasonable salary and clean books. Set it up when the election takes effect, not at tax time, so each month's expenses are substantiated and reimbursed inside the 60-day window.
The bottom line
An S-Corp owner who pays business costs personally needs an accountable plan. Without one, those costs either become taxable wages or are lost entirely, and section 67(h) now makes that permanent.
The plan itself is simple: business connection, substantiation within a reasonable period, and return of any excess. The discipline is in the monthly records, especially the mileage log.
If you elected S-Corp status and aren't sure this piece is in place, the 20-minute intro call is the place to start.
Common follow-up questions
- Does an accountable plan have to be in writing?
- The regulation requires the arrangement to impose the business connection, substantiation and return-of-excess rules, but it does not use the word written. In practice, a written plan adopted by the corporation is how you prove those rules existed before the reimbursements were paid. Without one, you are arguing from memory in an audit.
- Can I set up an accountable plan in October and still cover this year?
- Going forward, yes. Expenses from earlier in the year are harder, because the timing rules in Treas. Reg. 1.62-2(g) require substantiation within a reasonable period, and the fixed date safe harbor uses 60 days. How far back a new plan can reach is a judgment call for your CPA, not something to assume.
- What if my S-Corp just pays the phone bill directly?
- An expense the company pays and that is purely for the business is simply a company expense. The accountable plan matters for costs you pay personally, or mixed-use costs like a personal phone, home or car, where only the business share belongs on the company's books.
Sources
- 26 CFR 1.62-2, Reimbursements and other expense allowance arrangements
- 26 U.S. Code 67, 2-percent floor on miscellaneous itemized deductions
- 26 U.S. Code 280A, Disallowance of certain expenses in connection with business use of home
- IRS: Standard mileage rates
- Internal Revenue Bulletin 2026-29 (Announcement 2026-11, revised 2026 mileage rates)
- IRS Notice 2026-10, 2026 Standard Mileage Rates
- IRS Publication 463, Travel, Gift, and Car Expenses
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General information for educational purposes, not advice for your situation. Tax rules change; talk with a CPA before acting.