IRC Section 62(c): Accountable Plan Requirements

An employer reimbursement arrangement keeps payments out of your taxable wages only if it meets the three accountable plan requirements in IRC Section 62(c): each expense must have a genuine business connection to your work, you must substantiate each expense to your employer with adequate detail, and you must return any advance or reimbursement that exceeds what you actually substantiated within a reasonable time.¹ Fail any one, and the Treasury regulations reclassify the whole arrangement as nonaccountable, which means every dollar paid under it becomes taxable wages subject to income tax and payroll tax withholding.²

Business Connection

The expense has to be directly tied to your performance of work for the employer, and it has to be the kind of cost that would qualify as a deductible business expense under the Internal Revenue Code.² Professional travel, lodging away from home, business meals, and supplies needed to do the job are the everyday examples. The expense must primarily serve the employer’s interests. Commuting between home and a regular office never qualifies, no matter the distance, because the IRS treats it as a personal cost.

Not a Disguised Pay Cut

A reimbursement cannot be carved out of wages. If an employer drops an hourly rate and relabels the difference as a “tool allowance” or “reimbursement,” the arrangement fails the business connection test. The Treasury regulations are explicit: if an employee receives the same total compensation whether or not any business expense is actually incurred, there is no genuine business connection.² The reimbursement has to be paid on top of agreed compensation, not out of it.

The One-Year Rule for Travel

For travel reimbursements, duration matters. If an assignment at a single location is realistically expected to last one year or less, and it does, the employee is away from home temporarily and reimbursed travel expenses qualify. If the assignment is expected to last more than one year, that location becomes the employee’s tax home, and any living-expense payments the employer makes for that location are taxable income regardless of what the employer calls them.³ If a “temporary” project gets extended past the one-year expectation, reimbursements become taxable from that point forward.

Substantiation

You must give your employer enough detail to verify four elements of every expense: the amount, the date, the location, and the business purpose. Round-number estimates and vague descriptions do not satisfy the standard; the record has to independently establish each element without relying on later memory.¹

When Receipts Are Required

Not every expense needs a paper receipt. Documentary evidence, meaning a receipt, paid bill, or similar proof, is required for any lodging expense regardless of amount, and for any other business expense of $75 or more per transaction.⁴ Below $75, a contemporaneous log entry covering the four elements is generally enough. Transportation costs where receipts are not readily available may be excused from documentary evidence even above the $75 threshold.⁵

Mileage

Personal-vehicle use for business can be reimbursed at the IRS standard mileage rate, set at 72.5 cents per mile for 2026.⁶ Each trip needs a log entry showing the miles driven, the date, the destination, and the business reason. Records made at or near the time of the trip are the strongest evidence, whether that log is kept in a tracking app or on paper.⁷

Electronic Records

Digital receipts and electronic expense logs are acceptable if they are as reliable and accurate as paper originals. When an employer uses accounting software to track reimbursements, the IRS may request a backup copy of the original software file during an audit rather than exported spreadsheets. Reconstructed files or re-entered data for a single audit year do not satisfy the requirement.⁸

Per Diem as a Substantiation Shortcut

Saving every hotel bill and meal receipt gets burdensome for frequent travelers. The IRS offers a shortcut: when an employer pays a per diem at or below the applicable federal rate, the expense amount is treated as substantiated automatically. The employee still needs to document the dates, locations, and business purpose of the travel, but not individual meal or lodging receipts.

For the period beginning October 1, 2025, the IRS publishes two rates under the high-low method:

High-cost localities: $319 per day, with $86 allocated to meals
All other locations within the continental U.S.: $225 per day, with $74 allocated to meals

Transportation-industry employees have a separate flat meal-and-incidentals rate of $80 per day for domestic travel and $86 for travel outside the continental U.S. The incidental-expenses-only rate is $5 per day for all locations.⁹

Per diem is optional. An employer can always reimburse actual expenses with full documentation instead. If an employer pays a per diem above the applicable federal rate, the excess must be reported as taxable wages. The nontaxable portion is reported on the employee’s Form W-2 in Box 12 using Code L, and the excess goes into Boxes 1, 3, and 5 like any other wage payment.¹⁰

Returning Excess Amounts

If you receive an advance or reimbursement that exceeds the expenses you can actually document, the leftover has to go back to the employer.¹ It has to be an actual return of cash or a payroll deduction, not a bookkeeping entry that offsets a future reimbursement.

The Two Safe Harbors

The statute requires the return within a “reasonable period,” and the Treasury regulations define two safe harbors that remove the guesswork.

Under the fixed-date method, three timelines apply. Advances must be provided within 30 days before the expense is expected to be incurred. The employee must substantiate the expense within 60 days after it is paid or incurred. Any unsubstantiated amount must be returned within 120 days after the expense is paid or incurred.²

Under the periodic-statement method, the employer issues statements at least quarterly listing any outstanding unsubstantiated amounts. After receiving a statement, the employee has 120 days to either submit documentation or return the money.²

Missing a safe harbor does not automatically disqualify the plan, but it shifts the analysis to facts and circumstances, where “reasonable” is harder to prove.

What Compliance Looks Like on the W-2

When the arrangement meets all three requirements, reimbursed amounts are excluded entirely from Form W-2. They do not appear in Box 1 (wages for income tax), Box 3 (Social Security wages), or Box 5 (Medicare wages).¹⁰ The employee keeps the full reimbursement with nothing withheld, and the employer avoids its share of payroll taxes on those amounts.

When the plan is nonaccountable, every reimbursement dollar is included in all wage boxes on the W-2, federal income tax is withheld at the 22% supplemental rate, and the employee’s share of Social Security and Medicare is withheld. The employer also pays its own matching payroll taxes on those amounts.

Penalties for Misclassification

Treating a nonaccountable arrangement as tax-free carries escalating consequences:

A 20% accuracy-related penalty on the underpayment when an employer underreports employment taxes because it treated nonaccountable reimbursements as tax-free.¹¹
A 75% civil fraud penalty on the portion of the underpayment attributable to fraud, if the IRS finds the misclassification was fraudulent rather than negligent.¹²
Felony prosecution for willful evasion, carrying fines up to $100,000 for individuals and $500,000 for corporations, plus up to five years in prison.¹³

The IRS does not need to prove intent for the accuracy penalty. Negligence is enough.

Independent Contractors Are Not Covered

Section 62(c) and the accountable plan regulations apply only to employer-employee relationships. Independent contractors cannot participate in an employer’s accountable plan.² A contractor reimbursed by a client must substantiate each element (amount, date, location, business purpose, and business relationship) under a separate set of rules to keep the reimbursement out of income; if the contractor does not, the reimbursement is taxable. A business that relies on contractors cannot simply extend its accountable plan to cover them.

Whether an Employer Has to Reimburse in the First Place

The federal accountable plan rules govern whether a reimbursement is taxable. They do not require an employer to reimburse business expenses at all. Roughly a dozen states and the District of Columbia impose their own obligations to reimburse at least some necessary work-related expenses, and those laws vary widely in scope, from full reimbursement of all necessary expenditures to narrower rules that only prevent expenses from cutting pay below the minimum wage. Employers operating across state lines should check whether any of those states imposes a reimbursement duty independent of the federal tax framework.

1
Office of the Law Revision Counsel. 26 USC 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. Revenue Ruling 2003-106
5
Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses
6
Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile
7
Internal Revenue Service. Publication 15-B, Employer’s Tax Guide to Fringe Benefits
8
Internal Revenue Service. Use of Electronic Accounting Software Records – Frequently Asked Questions and Answers
9
Internal Revenue Service. Notice 2025-54 – 2025-2026 Special Per Diem Rates
10
Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3
11
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
12
Office of the Law Revision Counsel. 26 USC 6663 – Imposition of Fraud Penalty
13
Office of the Law Revision Counsel. 26 USC 7201 – Attempt to Evade or Defeat Tax