Federal Mileage Reimbursement: What It Means for Employers

What it means in practice

Mileage reimbursement is the process side of employee car expenses: whether to pay, what counts as a business mile, what the employee must record, how fast the paperwork must move, and which payments become taxable pay. The rates, FAVR plan limits, Form W-2 code L reporting and the FLSA regular-rate rules are covered on the federal mileage rate page; this page covers reimbursement policy and records, and overnight meals and lodging fall under per diem.

Is reimbursement required? Not as a general federal rule. IRS Publication 463 (2025) recognizes that an employee may be paid "a salary or commission with the understanding that you will pay your own expenses," in which case there is no reimbursement arrangement at all. The Fair Labor Standards Act sets a floor rather than a reimbursement duty. Wages must be paid "free and clear" (29 CFR 531.35), and in Opinion Letter FLSA2020-12 the Wage and Hour Division said an employer violates the FLSA "if the employee's wages, minus expenses, end up below the federal minimum wage" for a non-overtime workweek. That matters for non-exempt drivers paid near the minimum wage. The same letter says the IRS rate is optional and that a reasonable approximation of the expenses is enough. State law can go further, as described below.

Business miles versus commuting. Publication 463, chapter 4, says the costs of driving "between your home and your main or regular place of work" are personal commuting expenses, "no matter how far your home is" and "even if you work during the commuting trip." Business calls or a business passenger on the drive do not change that. Business transportation includes getting from one workplace to another, visiting clients or customers, going to a business meeting away from the regular workplace, and getting from home to a temporary workplace when the employee has one or more regular places of work.

Temporary work locations and home offices. These rules come from Rev. Rul. 99-7 (Internal Revenue Bulletin 1999-5) and are restated in Publication 463. A work location is temporary if the assignment is realistically expected to last, and does last, 1 year or less; an assignment expected to last more than 1 year is not temporary, however long it actually lasts. An employee with a regular work location away from home can treat daily round trips between home and a temporary location in the same trade or business as business travel, regardless of distance. An employee with no regular place of work who ordinarily works in one metropolitan area can do so only for temporary sites outside that area. If the home office qualifies as the principal place of business, trips between home and another work location in the same business count. Parking at the regular workplace is commuting, while business parking at a client's location is not.

Why the line matters for payroll. An accountable plan may cover only expenses that would be deductible business expenses. Under 26 CFR 1.62-2(d)(2), when an arrangement also pays for other expenses that are not deductible, such as local travel that is not business travel, the employer is treated as having two arrangements, and the payments for the nondeductible expenses fall into the nonaccountable one. A commuting reimbursement therefore becomes wages, and for FLSA purposes it is not excluded from the regular rate (29 CFR 778.217(d)).

What a mileage log must show. Rev. Proc. 2019-46 says an employee paid a mileage allowance must still substantiate "the elements of time, place (or use), and business purpose" of the driving (see also 26 CFR 1.274-5(j)(2)). Table 5-1 of Publication 463 lists, for car expenses, the date of each use, the business destination, the business purpose, the mileage for each business use and the total miles for the year. The sample log in Table 5-2 has columns for date, destination (city, town or area), business purpose, starting and ending odometer readings, miles for the trip, and other expenses such as tolls. Publication 463 says approximated or estimated amounts cannot be deducted, and a computer record is adequate.

When entries must be made. The regulations ask for each element to be recorded "at or near the time" of the use, when the employee has "full present knowledge" of it, and say a log kept weekly that accounts for use during the week qualifies (26 CFR 1.274-5T(c)(2)(ii)(A)). A sales representative on an established route can record the route length once, the date of each trip and the year's total miles. A lunch stop between two business stops does not interrupt business use (Pub. 463, chapter 5).

Adequate accounting to the employer. Under 26 CFR 1.274-5(f)(4), an adequate accounting means giving the employer the log or similar record "together with supporting documentary evidence," and the employee must account for all amounts received during the year as advances, reimbursements or allowances. The tests apply employee by employee (26 CFR 1.62-2(i)).

Choosing a reimbursement method. Rev. Proc. 2019-46 allows several approaches. A cents-per-mile allowance at or below the business standard mileage rate is deemed to substantiate the amount, so receipts for gas and repairs are not needed, though the mileage record is. An actual-cost plan reimburses the employee's documented costs; Publication 463 lists depreciation, lease payments, registration, licenses, insurance, repairs, gas, garage rent, tires, oil, tolls and parking, and says mixed-use costs are divided by miles, so 12,000 business miles out of 20,000 is 60%. A flat rate or stated schedule may combine a periodic fixed payment with a cents-per-mile payment. A fixed and variable rate (FAVR) allowance is a structured version with its own limits, including a written declaration from the employee within 30 days after coverage begins (section 6.06).

Flat car allowances. For a combined allowance that is not a FAVR, Rev. Proc. 2019-46 says the employer must compare, at least quarterly, the total allowance paid with the standard mileage rate times the business miles the employee substantiated for the period. Any excess is subject to withholding and employment taxes no later than the first payroll period after the one in which it is computed (section 8.01(3)). The return requirement is treated as met if employees must return, within a reasonable period, any amount above the rate times substantiated miles (section 7.03(2)).

Nonaccountable plans. Publication 15 (2026) treats payments as made under a nonaccountable plan when the employee is not required to substantiate expenses, or does not do so on time; is not required to return unused advances, or does not return them on time; is paid regardless of whether business expenses are expected; or receives as a reimbursement an amount that would otherwise have been paid as wages. These payments "are wages and are treated as supplemental wages," subject to income tax withholding, Social Security, Medicare and FUTA, and they go in box 1 of the Form W-2. An employee cannot turn a nonaccountable plan into an accountable one by choosing to account and return the excess (26 CFR 1.62-2(c)(3)(i)). Publication 463 also treats an arrangement that repays expenses by reducing reported wages as nonaccountable.

Timing and the reasonable period. Under 26 CFR 1.62-2(g), reasonableness depends on the facts, but two safe harbors always qualify. Under the fixed date method, an advance paid within 30 days of the expense, substantiation within 60 days after it is paid or incurred, and return of any excess within 120 days are reasonable. Under the periodic statement method, the employer sends a statement at least quarterly listing unsubstantiated amounts and asks the employee to substantiate or return them within 120 days. A practice of overpaying to avoid withholding forfeits both safe harbors for those years. If miles are not substantiated or excess is not returned in time, Publication 15 says the amount is taxed for the first payroll period following the end of the reasonable period. When a paycheck combines wages and a reimbursement, the employer must specify the reimbursement amount (Publication 15; 26 CFR 1.62-2(d)(1)).

Where states require reimbursement (examples). Some states impose their own duty to pay. California: the Labor Commissioner says an employee "is entitled to be reimbursed by his or her employer for all expenses or losses incurred in the direct consequence of the discharge of the employee's work duties" (Labor Code Section 2802). Illinois: the Illinois Department of Labor says Public Act 100-1094 amended the Wage Payment and Collection Act, effective January 1, 2019, and its required workplace poster says employers "must reimburse employees for all necessary expenditures or losses incurred by an employee during the scope of employment and related to services performed for the employer," with the employee submitting the request "within 30 calendar days unless an employer policy allows for additional time." Other states differ; the DOL lists state labor offices.

Contractors are different. An independent contractor who does not account to the client for a travel reimbursement must include it in income (Pub. 463). The 2026 Instructions for Forms 1099-MISC and 1099-NEC list, as nonemployee compensation, a fee or "travel reimbursement for which the nonemployee did not account to the payer, if the fee and reimbursement total at least $2,000."

Example 1: commuting or business? Remindax illustration with assumed facts, at the 76-cent rate for August 2026. A technician who normally reports to the company shop drives from home to a customer site for a 3-day job, 24 miles round trip daily. Because the technician has a regular workplace and the site is temporary, all 72 miles are business: 72 x $0.76 = $54.72. A second technician has no regular office and drives 10 miles from home to the first customer, 15 miles between customers and 12 miles home. Only the 15 miles between customers are business ($11.40). The other 22 miles are commuting, so paying for them would be wages.

Example 2: an advance with leftover miles. Remindax illustration. In September 2026 an employer advances $380 for 500 anticipated business miles at 76 cents. The employee logs 350 business miles and turns in the log within 60 days, so $266 (350 x $0.76) is substantiated. The $114 for the 150 miles not driven must be returned within the reasonable period; if it is not, the $114 becomes wages no later than the first payroll period after that period ends (Rev. Proc. 2019-46, section 8.01(2); 26 CFR 1.62-2(h)(2)(i)(A)).

Example 3: a flat allowance tested quarterly. Remindax illustration. An employer pays $400 a month plus 20 cents a mile, not a FAVR. For July through September 2026 the employee receives $1,200 plus $400 for 2,000 substantiated business miles, a total of $1,600. The standard rate times substantiated miles is $1,520 (2,000 x $0.76). The $80 difference is the excess under section 8.01(3) of Rev. Proc. 2019-46; if it is not returned, it is supplemental wages no later than the first payroll period after the employer computes it.

Questions employers ask. Do employees need gas receipts under a cents-per-mile plan? No; the rate stands in for operating costs, but the mileage, time, place and purpose records are still required (Rev. Proc. 2019-46, section 7.02). Can tolls and parking be paid on top of the rate? Publication 463 treats business parking fees and tolls as separate from the standard mileage rate; parking at the regular workplace is commuting. Does an employee keep copies of the log? Publication 463 says employees who give their records to the employer and are reimbursed generally do not need to keep copies, and Publication 15 tells employers to keep employment tax records for at least 4 years. Confirm specifics with a qualified tax professional.

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