Mileage Reimbursement for Technicians: The IRS Rules Before Year-End

It's the second week of December and you're doing the last mileage checks of the year. Three of your techs drive their own pickups to jobs. One of them, Marco, hands you a notebook with this year's trips. Some pages have dates and addresses. Some just say "Johnson, 22 mi." July is missing entirely. You need to pay him, and you need the payment to hold up if anyone asks.

This post is about mileage reimbursement for employees, specifically W-2 technicians who drive their own vehicles to jobs. It covers how to pay them without the money turning into taxable wages, the split IRS rate that makes 2026 different from every recent year, what each trip record needs, and a checklist for closing out the year.

It's general information, not tax or legal advice. Run your policy past your accountant.

Who this applies to

Three common setups, and they're handled differently:

• Techs drive their own vehicles and you reimburse them. This post is mostly about you.
• Techs drive company-owned vans. You're not reimbursing anyone. The business deducts its vehicle costs, and the rules for that are different. One detail worth knowing: the IRS says you generally can't use the standard mileage rate if you operate five or more cars at the same time (IRS Topic 510). Ask your accountant how to handle the fleet.
• The owner drives their own truck. If you're self-employed, that's a Schedule C question, covered in our Schedule C mileage deduction guide.

Why reimbursement matters to your techs: the IRS says most employees can't deduct unreimbursed car expenses on their own returns (IRS Topic 510). If you don't pay for the miles, they eat the cost.

How mileage reimbursement for employees works under an accountable plan

The tax treatment of a reimbursement depends on how you pay it, not how much. The IRS rule is in the regulation on employee reimbursement arrangements, 26 CFR 1.62-2. It splits arrangements into two kinds.

An accountable plan meets three requirements:

1. Business connection. The money covers business expenses the employee actually had while working for you. A flat amount paid whether or not the tech drives doesn't qualify.
2. Substantiation. The tech accounts for each expense to you within a reasonable time. For mileage, that means a trip record.
3. Returning the excess. If you advance more than the tech spends, they have to give the extra back within a reasonable time.

Meet all three and the reimbursement generally isn't wages. No withholding, no payroll tax, not on the W-2 as pay.

A nonaccountable plan is anything that fails those rules, like a flat $300 a month "truck allowance" with no trip records. Under the regulation, everything paid under a nonaccountable plan is wages, subject to withholding and employment taxes.

What "a reasonable time" means

The regulation gives a safe harbor called the fixed date method. Timing counts as reasonable if:

• any advance is paid within 30 days of the expense,
• the expense is substantiated within 60 days after it happens, and
• any excess is returned within 120 days after it happens.

For mileage, the easy version: techs turn in their trips at least monthly, and you pay within the same cycle. Marco's notebook from July, handed in during December, is the problem.

The rate: 2026 is a split year

The IRS standard mileage rate for business changed in the middle of 2026. According to the IRS standard mileage rates page:

• January 1 to June 30, 2026: 72.5 cents per mile
• July 1 to December 31, 2026: 76 cents per mile

Paying at or below the federal rate, with proper trip records, keeps the reimbursement inside the accountable plan. Paying above it creates a problem: under the same regulation, the part of a mileage allowance above the deemed-substantiated amount is treated as paid under a nonaccountable plan. The regulation's own example walks through an employer paying 4 cents a mile over the federal rate, and the extra being subject to employment taxes.

Here's how that plays out in a split year. Illustrative example: Marco drove 4,200 business miles from January through June and 4,800 from July through December.

• First half: 4,200 × $0.725 = $3,045
• Second half: 4,800 × $0.76 = $3,648
• Total at the correct split rates: $6,693

If the office pays all 9,000 miles at 76 cents because "that's the rate," the total is $6,840. The extra $147 is above the federal rate for the first-half miles, which generally makes it taxable wages. Not a big number for one tech. Across a dozen techs, it's a W-2 correction nobody wants in January.

The IRS hasn't published the 2027 rate yet. We'll update this post when it does. Until then, keep paying January 2027 miles at the last published rate only if your accountant agrees, and true them up once the new rate is out.

For the history of this year's rate change, see our post on the IRS mileage rate for 2026.

What each trip record needs

The substantiation rule for vehicles is in 26 CFR 1.274-5T. For a car or truck, a record needs:

• The amount of business use, measured in miles, plus total miles for the period.
• The date of the use.
• The business purpose of each trip.

The regulation also cares about timing. Records are strongest when they're made at or near the time of the trip, while the details are fresh. A log kept weekly that covers that week's use counts as timely. A notebook rebuilt in December from memory is exactly the kind of record that gets questioned.

So "Johnson, 22 mi." is close but not there. It has the miles and a customer name that hints at purpose, but no date. A complete entry looks more like: "July 14, shop to 412 Elm St (Johnson water heater replacement), 22 miles."

We go deeper on making a log hold up in the audit-proof mileage log.

Business, commute or personal

Not every mile a tech drives is a business mile. Trips between jobs during the day are business travel for most purposes. The drive from home to the first job and back from the last one is often treated differently. The tax rules and the wage rules on this don't line up perfectly, so ask your accountant how to classify the first and last drive under your policy. For the pay side of the same question, see is drive time paid time?.

The practical step: have every trip marked business, commute or personal when it's logged, not in December.

What if you don't reimburse at all?

Some shops pay a higher hourly wage and skip reimbursement. Two things to check with your lawyer before you rely on that:

• The federal minimum wage rule. The Department of Labor's rule at 29 CFR 531.35 says wages must be paid "free and clear." Its example is an employer requiring workers to buy tools: if that cost pushes pay below the minimum or overtime wage owed, it's a violation for that week. The regulation doesn't mention vehicles specifically, so ask how it applies to techs driving their own trucks.
• State reimbursement laws. Some states go further. California's Labor Code 2802 requires employers to reimburse employees for necessary expenses they incur doing their jobs.

A year-end checklist for the office

Before you cut the last checks of 2026:

• Collect every missing month now. Don't wait for January. Gaps get harder to fill every week.
• Split the year. Pay or true up January–June miles at 72.5 cents and July–December miles at 76 cents.
• Check for anything paid above the federal rate. Send any excess to payroll as wages before W-2s are prepared.
• Look for flat allowances. Any "truck allowance" without trip records is wages. Decide with your accountant whether to keep it that way or move to an accountable plan in 2027.
• Write the policy down. How often techs submit trips, what each record needs, when you pay, how commute miles are handled, and how excess advances come back. Our guide to writing a 2026 mileage reimbursement policy covers what a written policy should include.
• Save the records. Keep the trip logs with your payroll records. Ask your accountant how long to hold them.

Where FSM Navigator fits

FSM Navigator doesn't run payroll or cut reimbursement checks. What it does is make the trip records exist without anyone keeping a notebook.

On Pro, mileage tracking logs every drive to a job automatically, so the trip is tied to the job and recorded when it happens, not reconstructed later. It works offline and syncs when the phone reconnects. Each trip can be marked business, commute or personal, and a tech can change the classification on their own trips. Each trip records its date, miles and job, and you can export a year-end CSV for whoever runs payroll.

Until you set your own cost per mile, mileage is valued at the IRS standard rate. Each trip is valued by its own date, so a report that spans both halves of 2026 uses 72.5 cents for the first half and 76 cents for the second. That mileage cost also feeds job profitability, so you can see what the driving costs on each job.

Each trip in the export carries the job it was driven for, and you can add a purpose to each trip.

Stop chasing notebooks in December. Try Pro free for 14 days and let every drive to a job log itself.