Accountable Plan 2026: IRS Rules, the 60/120-Day Safe Harbors, and How S Corp Owners Get Reimbursed Tax-Free

An accountable plan is an employer reimbursement arrangement that passes the three tests in Treasury Regulation §1.62-2: a business connection, substantiation within a reasonable period, and return of any excess. Payments under it are not wages, so the employee owes no income tax or FICA on them, nothing appears on the W-2, and the company deducts the cost. For S corporation owners in 2026, an accountable plan is the only way to get a tax benefit from home office, personal-car mileage, and phone costs paid out of pocket, because the One Big Beautiful Bill Act made the ban on unreimbursed employee expense deductions permanent.

Key takeaways:

• Three tests, all required: business connection, substantiation, return of excess. Fail one and every payment under the arrangement becomes W-2 wages
• Safe-harbor deadlines: substantiate within 60 days of the expense, return excess within 120 days, or use quarterly statements with a 120-day window
• Unreimbursed employee expenses stay nondeductible for good: IRC §67(h), made permanent by OBBBA §70110
• S corp home office reimbursements must use actual expenses; the $5-per-square-foot simplified method is not available to reimbursed employees (Rev. Proc. 2013-13)
• 2026 mileage: 72.5¢ for miles driven Jan 1–Jun 30, 76¢ from Jul 1–Dec 31. Only the amount above the rate becomes taxable wages

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What Is an Accountable Plan?

An accountable plan is a reimbursement or expense allowance arrangement between an employer and its employees that meets the requirements of IRC §62(c) and Treasury Regulation §1.62-2. The statute sets the floor: an arrangement is not a qualifying reimbursement arrangement if it does not require the employee to substantiate expenses, or if it lets the employee keep any amount beyond the substantiated expenses (26 U.S.C. §62). The regulation adds the business-connection test and the timing rules.

The label decides where the money lands on the employee's return:

Accountable plan payments also stay off Form 1099: the IRS instructions for Forms 1099-MISC and 1099-NEC say not to use either form for employee business expense reimbursements (Rev. December 2026). Under Treas. Reg. §1.62-2(c)(3), if an arrangement fails any of the three tests, "all amounts paid under the arrangement are treated as paid under a nonaccountable plan," and an employee cannot fix that afterward by voluntarily turning in receipts (26 CFR §1.62-2).

The Three IRS Requirements for an Accountable Plan

1. Business connection

The plan may pay only for expenses that would be deductible business expenses under IRC §162 and related sections, incurred while performing services as an employee (§1.62-2(d)). Reimbursing a personal expense under the same plan does not make it deductible. IRS Publication 463 gives the example of an employer that reimburses meals for working late at the office while not traveling: that piece is treated as paid under a nonaccountable plan and becomes wages, while the rest of the plan survives.

2. Substantiation

The employee must document each expense to the employer within a reasonable period (§1.62-2(e)). For travel, car use, and other §274(d) expenses, that means the amount, time, place, and business purpose; for car use, the mileage, dates, and destinations. Publication 463 excuses receipts for expenses under $75 other than lodging, but the log entry is still required.

3. Return of excess

Any advance or allowance beyond the substantiated amount must go back to the employer within a reasonable period (§1.62-2(f)). When an employee keeps the excess, only that excess becomes wages; the substantiated part keeps its tax-free treatment (§1.62-2(c)(2)(ii)).

The 60-day and 120-day safe harbors

What counts as a "reasonable period" depends on facts and circumstances, but §1.62-2(g)(2) gives two safe-harbor methods that end the argument:

Both safe-harbor methods disappear for any year in which the employer has a "pattern of overreimbursements," a practice of paying more than substantiated expenses while avoiding reporting and withholding (§1.62-2(g)(3)). A shareholder who files one expense report in December covering January's trips has missed the 60-day window for most of the year and is left arguing facts and circumstances.

Why S Corp Owners Need an Accountable Plan

An S corporation owner who works in the business is a W-2 employee of the corporation, and employees cannot deduct unreimbursed business expenses. The Tax Cuts and Jobs Act suspended miscellaneous itemized deductions for 2018 through 2025, and OBBBA §70110 removed the end date, so IRC §67(h) now reads that no miscellaneous itemized deduction "shall be allowed for any taxable year beginning after December 31, 2017" (26 U.S.C. §67). A home office, a personal car driven to clients, or a phone plan paid personally produces no deduction on the owner's Form 1040.

That leaves three ways for the money to move, and only one is efficient:

• Accountable plan: the corporation deducts the reimbursement, the owner receives it tax-free, and the corporation's pass-through profit falls by the same amount
• No reimbursement, or a distribution: the cost is simply lost for tax purposes
• Reimbursement without a plan: the payment is wages, so it carries income tax plus 15.3% FICA across both halves, the worst of the three

The plan does not replace salary. The IRS warns that an arrangement that "recharacterizes taxable wages as nontaxable reimbursements" fails the business-connection test entirely (Rev. Proc. 2019-46, section 8.04, citing Rev. Rul. 2012-25), so cutting your reasonable S corp salary and topping it up with "reimbursements" puts the whole plan at risk.

See What a Plan Saves You

Worked example. Idris owns 100% of an IT consulting S corporation in Tampa, Florida, is in the 24% federal bracket, and works from a 220-square-foot office in his 2,200-square-foot house, which is the company's only office. Florida has no personal income tax. His 2026 out-of-pocket business costs:

With the plan, the corporation deducts $8,570 and Idris's K-1 income drops by $8,570, which saves $2,057 of federal income tax at 24% compared with absorbing the costs. If he claims the 20% QBI deduction on the S corp profit, the smaller profit also trims that deduction, and the net saving is about $1,645. Had the company instead reimbursed him without a plan, the payments would be wages: $1,899 of income tax on the extra wage income net of the employer's FICA deduction, plus $1,311 of FICA, a $3,210 difference.

Because $1,380 of his mortgage interest and $460 of his property tax came back to him through the home office reimbursement, Idris leaves that share off Schedule A.

What an S Corp Can Reimburse Under an Accountable Plan

Home office: actual expenses, never the $5 simplified method

An S corp owner's home office reimbursement must be built from actual costs. Rev. Proc. 2013-13, section 4.02, says the simplified $5-per-square-foot method "does not apply to an employee with a home office if the employee receives advances, allowances, or reimbursements" under a reimbursement arrangement. Multiply the office's share of the home by the year's mortgage interest or rent, property tax, insurance, utilities, and repairs. Many plans leave depreciation out to avoid basis and recapture questions when the house sells.

The office must also pass the employee version of the home office test. IRC §280A(c)(1) allows the deduction for an employee only if the exclusive, regular use "is for the convenience of his employer" (26 U.S.C. §280A). An owner whose company has no other office, like Idris, meets that easily; an owner who also rents a downtown office should document why the home space is needed. Our home office deduction guide covers the exclusive-use rules in detail.

Mileage at the split 2026 rate

The standard mileage rate is 72.5 cents per mile for miles driven January 1 through June 30, 2026 (Notice 2026-10) and 76 cents for miles driven July 1 through December 31, 2026 after the mid-year increase in Announcement 2026-11 (Internal Revenue Bulletin 2026-29). A reimbursement at or below the rate in effect when the miles were driven, backed by a log, is the standard way to repay an owner for car use. Publication 463 adds a caution for employees related to their employer, which includes anyone owning more than 10% of the corporation: an allowance does not excuse you from proving the expenses to the IRS, so keep the log after the company pays.

Per diem for owners who hold more than 10%

Per diem has a trap for owners. Rev. Proc. 2019-48, section 6.07, says the lodging-plus-meals per diem and the high-low method "do not apply if a payor and an employee are related," using a 10% ownership test. An owner of more than 10% can still receive a meals-and-incidentals-only per diem at the federal M&IE rate for the destination, but lodging must be reimbursed from actual hotel receipts. The per diem rates guide lists how the M&IE rates work by locality.

Phone and internet

The IRS told examiners in memorandum SBSE-04-0911-083 (September 14, 2011) that reimbursing business use of an employee's personal cell phone is nontaxable when the employer has substantial noncompensatory business reasons, the coverage is reasonably related to business needs, and the reimbursement does not exceed the actual bill. For an owner, a reasonable business-use percentage applied to the monthly statement is the cleanest method.

Is Reimbursement Above the Standard Mileage Rate Taxable?

Only the excess is taxable. When an employer pays a mileage or per diem allowance above the federal rate and does not require the employee to return the difference, the portion above the rate "is treated as paid under a nonaccountable plan" while the rest stays tax-free (Treas. Reg. §1.62-2(h)(2)(i)(B)). Publication 463, Table 6-1, spells out the W-2 reporting: the excess goes in box 1 as wages, and the amount up to the federal rate is reported only under code L in box 12, where it is not taxed.

Example. An S corporation reimburses its owner at 80 cents a mile for 1,000 miles driven in August 2026. The federal rate for those miles is 76 cents, so $760 is a tax-free reimbursement shown under code L, and the 4-cent excess, $40, is wages subject to withholding and FICA in the payroll period when it is paid. The same trips reimbursed at 76 cents would produce nothing taxable. Our guide to whether mileage reimbursement is taxable walks through the employee side of the same rule.

How to Set Up an Accountable Plan for Your S Corp

The regulation does not require a written document, but a written plan adopted before the first reimbursement is the evidence an examiner will ask for. A workable plan fits on two pages:

1. Board resolution adopting the plan, dated before the first reimbursement it covers
2. Covered expenses: home office, vehicle use, phone and internet, travel, meals, supplies, with the method for each (actual cost, business-use percentage, or mileage rate)
3. Substantiation rule: expense reports with receipts for items of $75 or more and all lodging, submitted within 60 days
4. Excess rule: any advance not substantiated is repaid within 120 days
5. Reimbursement cadence: monthly or quarterly, paid by transfer from the business account to the employee's personal account
6. Excluded items: personal expenses, commuting, and anything the company already pays directly

Then run it. Submit a monthly or quarterly expense report with the log and receipts attached, reimburse the exact total, and book the payment to the underlying expense accounts rather than to payroll or owner draws. Expenses the corporation pays directly from its own card need no plan at all.

When an Accountable Plan Does NOT Help

• Sole proprietors and single-member LLCs taxed as disregarded entities. There is no employee. Deduct home office, mileage, and phone directly on Schedule C
• Partners and multi-member LLC members. Partners are not employees of the partnership. The partnership reimburses partner expenses directly, or, if the partnership agreement requires partners to pay them, the partner deducts them as unreimbursed partnership expenses on Schedule E (2025 Schedule E instructions)
• Personal or commuting costs. A plan cannot turn a nondeductible expense into a reimbursable one
• Salary substitutes. Payments made "regardless of whether the employee incurs" business expenses fail the business-connection test and are all wages (Rev. Proc. 2019-46, section 8.04)
• Flat allowances with no records. A $300 monthly phone stipend with no bill behind it is a nonaccountable payment
• Health insurance for a more-than-2% S corp shareholder. That runs through the W-2 under separate rules and is not an accountable plan item

Common Accountable Plan Mistakes S Corp Owners Make

1. Reimbursing the home office at $5 per square foot

It is the easiest number to compute and the one Rev. Proc. 2013-13 rules out for reimbursed employees. A 300-square-foot office reimbursed at $1,500 with no actual-cost worksheet has no substantiated basis.

2. Taking a lodging per diem as a 10%-plus owner

Rev. Proc. 2019-48 limits a related owner to the M&IE-only rate. The hotel part of a full per diem paid to an owner of more than 10% is not deemed substantiated, so reimburse lodging from the actual folio.

3. Reimbursing once a year in December

A single year-end reimbursement for January through December misses the 60-day safe-harbor deadline for most of the expenses. Reimburse monthly or quarterly.

4. Deducting the same costs twice

Mortgage interest and property tax reimbursed through the home office share should not reappear on Schedule A, and mileage reimbursed by the company is not also a deduction anywhere else.

5. Using the wrong mileage rate for the half-year

Miles driven before July 1, 2026 use 72.5 cents. Paying 76 cents for spring trips creates a small wage amount for the 3.5-cent excess on every mile.

Clean Expense Reports Without the Shoebox: How Jupid Helps

An accountable plan only works if the company can show which personal-card charges were business costs and when they were reimbursed. Jupid connects your business and personal bank accounts, categorizes transactions automatically with 95.9% accuracy, and keeps reimbursements separate from salary and owner distributions in your books. Ask the AI accountant in WhatsApp or iMessage how much the company owes you for this quarter's phone and internet, or which charges on your personal card look like business expenses, and you get the answer in the chat. Try Jupid.

Sources

• Treasury Regulation §1.62-2: accountable plan tests, safe harbors, per diem and mileage excess, anti-abuse rule
• IRC §62: §62(a)(2)(A) and §62(c) reimbursement arrangements
• IRC §67: §67(h) permanent suspension of miscellaneous itemized deductions (OBBBA §70110)
• IRC §280A: §280A(c)(1) convenience-of-employer test
• IRS Publication 463 (2025), Travel, Gift, and Car Expenses: accountable plan rules, reasonable-period list, related-employer rule, Table 6-1 W-2 reporting, $75 receipt rule
• Rev. Proc. 2019-46: mileage allowances, wage recharacterization (section 8.04)
• Rev. Proc. 2019-48: per diem substantiation, 10% related-party rule (section 6.07)
• Rev. Proc. 2013-13: simplified home office method unavailable to reimbursed employees (section 4.02)
• Notice 2026-10 and Announcement 2026-11 in IRB 2026-29: 2026 mileage rates
• Instructions for Forms 1099-MISC and 1099-NEC (Rev. December 2026): accountable plan reimbursements are not reported on Form 1099
• IRS memorandum SBSE-04-0911-083: reimbursement of employee-owned cell phones

This guide is for general educational purposes and does not constitute tax, legal, or accounting advice. Accountable plan treatment depends on how the plan is written and followed, the owner's percentage, and the type of expense. Last reviewed September 24, 2026. For advice specific to your situation, consult a qualified tax professional.