Accountable Plans: IRS Rules, Records, and Per Diem Options

An accountable plan is an employer reimbursement arrangement that keeps business-expense payments out of an employee’s taxable wages, and the IRS rules for an accountable plan turn on three requirements: a business connection, timely substantiation, and return of any excess. Meet all three and the money never hits your W-2. Miss one and the entire payment becomes wages subject to income tax withholding, Social Security, and Medicare.

The framework sits in Section 62(c) of the tax code and the Treasury regulations at 26 CFR 1.62-2.¹² The IRS does not require a written plan document, but putting the arrangement in writing makes compliance far easier to demonstrate if the plan is questioned.

The Three Requirements

Every reimbursement that passes through the plan has to satisfy each of the following. Failing any one converts the payment to taxable wages.

Business connection. The expense must arise directly from performing work for the employer. Payments that function as disguised salary or bonuses do not qualify. A flight to meet a client counts; a gym membership you happen to use before a conference does not.

Substantiation. You must give the employer adequate proof of what you spent: the amount, the date, the place, and the business purpose. Vague descriptions will not hold up.³ “Client dinner” is not enough. Something like “dinner with ABC Corp procurement team to discuss Q3 contract renewal” gives the employer and any future auditor enough context.

Return of excess. If you received an advance or reimbursement larger than what you actually spent, you must return the difference. Keeping the surplus turns it into compensation.²

When all three are met, the reimbursement stays off the W-2 entirely. Nothing appears in Box 1 as wages, and no payroll taxes are withheld.⁴

How Fast Is “Reasonable”

The regulations require substantiation and returns within a “reasonable period of time” but do not fix one hard deadline. Instead, the IRS offers safe harbors. Stay inside them and the timing is not a fight.

Cash advances should go out no more than 30 days before the employee incurs the expense.²
Expense reports and receipts should be submitted within 60 days after the expense is paid or incurred.⁵
Any overpayment should be returned within 120 days after the expense is paid or incurred.⁶

Missing one of these dates by a day does not automatically kill the plan, but employers who let expense reports pile up until year-end are inviting the IRS to treat the entire arrangement as non-accountable. Prompt filing after each trip is the simplest protection.

What Expenses Qualify

Only costs with a direct business connection qualify. The common categories:

Travel to a temporary work location: flights, train tickets, rental cars, and other transportation while away from your regular workplace on business. A permanent reassignment does not count.³
Lodging when business travel requires an overnight stay away from your tax home, at rates reasonable for the location.
Meals during business travel. The reimbursement is fully tax-free to the employee even though the employer’s own deduction for the cost is limited to 50%.⁷
Personal vehicle use for business, reimbursed at the IRS standard mileage rate, which for 2026 is 72.5 cents per mile and covers fuel, insurance, depreciation, and maintenance.⁸
Cell phone use. An employer-provided phone furnished primarily for business is excluded from income as a working condition fringe benefit, with incidental personal use treated as a tax-free de minimis benefit. Reimbursement for business use of a personal phone can also qualify when the business use is documented.⁹

Lavish or extravagant spending does not qualify. There is no fixed dollar ceiling; the IRS asks whether the expense was reasonable in context.³ A $400 hotel in Manhattan during a conference may be fine. The same room in a small town where $120 options exist would draw questions.

Records You Need

Publication 463 sets the required detail for each expense entry: amount, date, place, and business purpose. Receipts are required for lodging regardless of amount and for all other expenses of $75 or more. Below $75 you still record the details, but a receipt is not required.³ There is also an exception for transportation charges where a receipt is not readily available, such as tolls or subway fares.⁵

Many employers require receipts for everything anyway. The IRS is fine with that, and it makes record-keeping cleaner. The piece most people skip is a running log of small cash items: parking meters, tips, transit fares. Those add up and are almost impossible to reconstruct from memory a week later.

The Per Diem Alternative

Instead of collecting receipts for every meal and hotel charge, an employer can pay a flat daily rate using the IRS per diem method. As long as the rate does not exceed the IRS-approved amount, the individual expenses do not have to be substantiated; the employee just documents the dates, locations, and business purpose of the travel.

The IRS publishes locality-specific rates, but many employers use the simpler high-low method. For travel on or after October 1, 2025, the high-low rates are $319 per day in high-cost locations ($86 allocated to meals) and $225 per day everywhere else ($74 allocated to meals).¹⁰

If a per diem payment exceeds the approved rate for the location, the excess must be reported as wages on the employee’s W-2 and is subject to income and payroll taxes. The portion within the approved rate is reported in Box 12 using code L.⁴

What a Failed Plan Costs

When an arrangement does not meet the three requirements, the IRS treats every payment as coming from a non-accountable plan. The reimbursement is reclassified as supplemental wages, and the employer withholds federal income tax at a flat 22%. If total supplemental wages paid to the employee during the calendar year top $1 million, the rate on the excess jumps to 37%.¹¹ Both sides also owe Social Security tax at 6.2% and Medicare tax at 1.45%.¹² The amounts show up in Box 1 of the employee’s W-2 as part of total wages.⁴

The employer picks up the matching Social Security and Medicare tax, plus federal unemployment tax. If an audit reclassifies payments, the employer can owe back taxes, penalties, and interest on every affected payment back to when the plan began failing. Handing out cash or writing checks without collecting substantiation is not casual bookkeeping; it builds a retroactive tax bill that grows with each payroll cycle.

Why the Plan Matters More Than It Used To

Before the Tax Cuts and Jobs Act, an employee who paid business expenses out of pocket and was not reimbursed could at least claim those costs as a miscellaneous itemized deduction, subject to a 2% floor. That deduction was suspended starting in 2018, and the One, Big, Beautiful Bill Act (P.L. 119-21) made the suspension permanent. Section 67(h) now disallows miscellaneous itemized deductions for all tax years after December 31, 2017, with no expiration date.¹³

An employee who pays for business travel, tools, or supplies out of pocket now has no federal tax relief at all. If the employer does not reimburse through an accountable plan, the employee absorbs the cost. There is no backup deduction. For workers who routinely spend their own money on business expenses, pushing for a formal accountable plan is the only way to avoid paying tax on money that was never really income.

Independent Contractors and State Rules

Accountable plan rules apply to employees. Independent contractors follow a different framework. When a business reimburses a contractor and the contractor does not account for the expenses to the payer, the reimbursement is included in Box 1 of Form 1099-NEC as nonemployee compensation once the total reaches $600 or more.¹⁴ When the contractor does account for expenses, the reimbursement is left out of the 1099-NEC amount, and the contractor can still deduct legitimate business expenses on Schedule C.¹⁵

Federal tax law itself does not require any employer to reimburse business expenses. An accountable plan is optional at the federal level. Roughly a dozen states and some cities do require reimbursement of necessary business expenses under state labor law, either always or when unreimbursed expenses would push the employee’s effective pay below minimum wage. Those state obligations exist independently of the IRS rules, and failing to comply creates a labor law violation on top of any tax consequences.

1
Office of the Law Revision Counsel. 26 U.S. Code 62 – Adjusted Gross Income Defined
2
eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
3
Internal Revenue Service. Publication 463 – Travel, Gift, and Car Expenses
4
Internal Revenue Service. Instructions for Forms W-2 and W-3
5
Internal Revenue Service. Revenue Ruling 2003-106
6
Internal Revenue Service. Publication 5137 – Fringe Benefit Guide
7
Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses
8
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents
9
Internal Revenue Service. Publication 15-B – Employer’s Tax Guide to Fringe Benefits
10
Internal Revenue Service. Notice 2025-54 – 2025-2026 Special Per Diem Rates
11
Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
12
Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
13
Office of the Law Revision Counsel. 26 USC 67 – 2-Percent Floor on Miscellaneous Itemized Deductions
14
Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC
15
Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC