Employer reimbursements for business expenses stay tax-free to the employee and fully deductible to the employer only when the arrangement satisfies the IRS accountable plan rules: a business connection, timely substantiation, and return of any excess payment. Miss any one of the three, and every dollar paid under the arrangement converts to taxable wages, subject to income tax withholding and payroll taxes on both sides. That outcome hurts more than it used to. The One Big Beautiful Bill Act of 2025 permanently eliminated the personal deduction employees once used to offset unreimbursed job costs, so a properly structured plan is now the only route to tax-free recovery of work-related spending.
The Three Requirements
Treasury Regulation 1.62-2 lays out the framework. A reimbursement arrangement qualifies as accountable only if it meets all three tests.1eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
- Business connection. The expense has to arise while the employee is performing services for the employer. Personal costs, commuting, and spending unrelated to work duties do not qualify.
- Adequate substantiation. The employee has to give the employer records documenting the expense within a reasonable time. Vague descriptions and round-number estimates do not count.
- Return of excess. If an advance or reimbursement exceeds the substantiated expense, the employee has to return the difference within a reasonable time.
The IRS provides two safe harbors that pin down what “reasonable time” means in practice. Substantiating an expense within 60 days of paying or incurring it is treated as timely, and returning any excess within 120 days satisfies the return requirement.1eCFR. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements Publication 463 restates the same three tests and adds practical guidance.2Internal Revenue Service. Publication 463, Travel, Gift, and Car Expenses
When a plan passes all three tests, the payment is excluded from the employee’s gross income, kept off the W-2, and exempt from payroll taxes. The employer deducts the cost as a normal business expense. When one test fails, the whole payment flips to compensation.
What Substantiation Actually Looks Like
Adequate substantiation means capturing four data points for each expense: the amount, the date, the location or vendor, and the business purpose. Skip any one of them and the IRS has an opening to reclassify the reimbursement.
The amount is the exact dollar figure, not a rounded estimate. The date is when the expense was incurred, not when the report was submitted. The location means the vendor name and address, or for travel, the city and state. The business purpose trips people up more than any other element. “Client meeting” is thin. “Lunch with Jane Smith of Acme Corp to discuss Q3 contract renewal” is what an employer needs to defend the deduction under audit.
Receipts and the $75 Rule
Receipts or other documentary evidence generally have to back the dollar amount. Treasury Regulation 1.274-5 carves out an exception: documentary evidence is not required for non-lodging expenses under $75.3eCFR. 26 CFR 1.274-5 – Substantiation Requirements Lodging receipts are always required no matter the amount. The threshold also does not apply to transportation charges where a receipt is not readily available. And even when the receipt itself is excused, the four substantiation elements still have to be recorded in a report or contemporaneous log.
Nothing stops an employer from setting a tighter internal threshold, such as requiring receipts on anything over $25. The $75 rule is a floor, not a ceiling.
Digital Records
Paper is not required. The IRS accepts electronic records under Revenue Procedure 97-22, which sets the standards for digital storage.4Internal Revenue Service. Revenue Procedure 97-22 The system has to produce legible, accurate reproductions, maintain an audit trail back to source documents, and include controls that prevent unauthorized changes. Scanned receipts and photos from expense-management apps meet the standard as long as every character is readable. Lose access to the software needed to retrieve the records and the IRS treats them as destroyed.
Travel, Mileage, and Meals
Business travel gets its own layer of rules, triggered when work takes the employee beyond the general area of their tax home and the trip requires sleep or rest. When that “away from home” test is met, lodging, transportation, dry cleaning, and tips are all fully reimbursable under an accountable plan.5Internal Revenue Service. Topic No. 511, Business Travel Expenses
For a personal vehicle used on business, the employer can reimburse actual costs or use the IRS standard mileage rate. For 2026, that rate is 72.5 cents per mile.6Internal Revenue Service. Standard Mileage Rates Updated for 2026 Using the standard rate counts as deemed substantiation of the dollar amount, but the employee still has to keep a mileage log with the date, destination, business purpose, and miles for each trip. Commuting miles between home and a regular workplace do not qualify.
Meals during business travel are reimbursable and non-taxable to the employee under an accountable plan, but the employer’s deduction is capped. Under IRC Section 274(n), the deduction for business meals is limited to 50% of the cost.7Office of the Law Revision Counsel. 26 USC 274 – Disallowance of Certain Entertainment, Etc., Expenses A temporary 100% deduction for restaurant meals expired at the end of 2022. The meal cannot be lavish or extravagant, and the employee or a representative of the employer has to be present.8Internal Revenue Service. IRS Notice 2018-76 – Expenses for Business Meals Under Section 274
Per Diem
Instead of tracking actual lodging and meal costs on every trip, an employer can pay a flat daily per diem based on federal rates. The employee still substantiates the time, place, and business purpose of the travel, but individual meal receipts and hotel bills are no longer required.
For the period beginning October 1, 2025, the IRS high-low simplified method sets the per diem at $319 per day for high-cost localities and $225 for all other domestic locations.9Internal Revenue Service. IRS Notice 2024-68 – Special Per Diem Rates Of those totals, $86 per day is allocated to meals and incidental expenses in high-cost areas and $74 in all others. That allocation matters because only the meal-and-incidental portion is subject to the 50% deduction limit. Any amount paid above the applicable federal per diem has to be treated as taxable income unless the employee substantiates the excess with actual receipts.
Remote Work and Home Office Costs
The accountable plan framework applies the same way to remote work expenses: internet service, cell phone bills, and home office equipment. Reimbursements are tax-free when the arrangement meets all three requirements. The business-connection test does most of the work in this category. The expense has to be incurred because of the job, and mixed-use costs like a home internet connection need a reasonable method for allocating the business share.
Equipment purchased by the employee, such as a desk, monitor, or computer, can be reimbursed tax-free when the purchase serves a legitimate business need and the employee provides receipts and a description of the business use. What the employee cannot do is keep the equipment while pocketing the reimbursement with no substantiation. A policy that skips documentation or excess-return requirements fails the accountable plan test, and every dollar becomes taxable wages.
Federal law does not require employers to reimburse remote work expenses at all. Roughly a dozen states have their own mandatory reimbursement statutes, and employers in those states can face penalties, sometimes including liquidated damages, for failing to cover necessary business costs.
When the Plan Fails
An arrangement that misses any of the three requirements is a non-accountable plan, and the consequences hit immediately on both sides.10Electronic Code of Federal Regulations. 26 CFR 1.62-2 – Reimbursements and Other Expense Allowance Arrangements
The full reimbursement is treated as supplemental wages. It goes into the employee’s gross income, lands in Box 1 of the W-2, and is subject to federal income tax withholding, Social Security tax, and Medicare tax. The employer has to withhold and remit payroll taxes on the entire amount, raising labor costs beyond the reimbursement itself.
The employee cannot offset any of that on a personal return. The Tax Cuts and Jobs Act suspended the miscellaneous itemized deduction for unreimbursed employee expenses starting in 2018, and the One Big Beautiful Bill Act of 2025 made that elimination permanent. There is no sunset date and no scheduled return. An employee whose reimbursements run through a non-accountable plan pays income and payroll taxes on money spent entirely on the employer’s behalf, with no way to recover any of it at filing time.
That is why the mechanics matter. A well-run accountable plan and a sloppy one look similar on paper, but the difference between them is the difference between a tax-free reimbursement and roughly a 30% to 40% effective tax hit on funds the employee spent for the business. The 60-day substantiation window, the 120-day return-of-excess window, and the four documentation elements are not paperwork for its own sake. They are what keeps the reimbursement out of taxable wages.