Employers · Policy design
Employer mileage reimbursement: setting a policy that holds up
Mileage policy sits at the junction of tax law, employment law and fraud control. Get it right and reimbursements are tax-free, deductible and undisputed. Get it wrong and you're grossing up payroll, defending a wage claim, or both. The employer's view, country by country.
One principle before the borders
In every system on this site, the official rate is a ceiling for tax-free treatment, not a payment mandate. Pay at or under it (with proper records) and the money moves tax-free. Pay over it and the excess is wages. Whether you must pay anything at all — and how much — is a separate employment-law question that varies by country and, in the US, by state. Policies fail when they conflate the two.
United States: accountable plans and the state-law overlay
The tax layer. Reimbursements stay off the W-2 only inside an "accountable plan," which is less a document than three behaviors: a business connection for each expense, substantiation within a reasonable time (date, destination, purpose, miles — the same fields as a compliant log), and return of any excess advances. Reimburse at or below the IRS standard rate (72.5¢ for 2026) and no tax attaches. Pay 80¢ and the 7.5¢ excess is taxable wages. Skip substantiation and the entire amount is wages — the most expensive paperwork shortcut in payroll.
The employment-law layer. No general federal duty to reimburse exists for most private employers (the floor: unreimbursed expenses can't drive effective pay below minimum wage). But state law can mandate it outright — California's Labor Code §2802 requires employers to indemnify employees for necessary business expenditures, and mileage is the classic case; Illinois and Massachusetts impose comparable duties. Class actions over unreimbursed vehicle costs are a real, recurring exposure for delivery and field-service businesses. A multistate employer's cheapest defense is one policy written to the strictest state it touches.
FAVR, briefly. Larger fleets sometimes replace the flat rate with a Fixed and Variable Rate plan — a localized fixed payment plus a per-mile variable amount, with a 2026 maximum standard automobile cost of $61,700. More accurate, more administration; usually only worth it at scale.
United Kingdom: AMAP does the design work for you
The AMAP rates (55p/25p for cars in 2026/27 after the backdated May increase) define the tax-free ceiling. Pay up to them: no tax, no NIC, no reporting. Pay above: the excess goes through payroll as earnings. Pay below: the employee can claim Mileage Allowance Relief on the shortfall — which means underpaying doesn't save the system money, it just shifts paperwork onto your staff. The 2026/27 wrinkle every UK employer should action: if you reimbursed at 45p between 6 April and the 21 May announcement, either top employees up to 55p for those miles (now tax-free) or tell them how to claim MAR on the 10p gap. Add the 5p passenger supplement to your policy too — it's free money for car-sharing you'd probably like to encourage. And keep regimes straight: employee-owned cars use AMAPs; company cars use the quarterly Advisory Fuel Rates.
Canada: the allowance-structure traps
Canada's rules punish structure errors more than rate errors. A per-kilometre allowance at the prescribed rate (73¢/67¢ for 2026, +4¢ in the territories), based solely on actual business kilometres, is non-taxable — no T4, no CPP, no EI. The traps: a flat monthly allowance is taxable regardless of how reasonable it feels; combining a flat amount with a per-km amount for the same use generally makes the whole arrangement taxable; and a rate far above prescribed invites the CRA to call it unreasonable, with the same result. Design the policy as pure per-km at or near prescribed, demand the log, and the tax treatment takes care of itself.
Australia: tax rate ≠ award obligation
The 88¢ ATO rate is a deduction rate, not an employment term. What you must pay an employee who drives their own car is set by the applicable modern award or enterprise agreement — many awards prescribe their own per-km vehicle allowance, and paying less than an award rate is an underpayment problem no tax argument fixes. Payroll treatment differs by structure too: a cents-per-km allowance (paid per expected business km) is reported differently from an expense reimbursement of actual costs, with different withholding consequences. The practical sequence: check the award first, set the rate, then let payroll classify it correctly.
The policy checklist
A defensible policy fits on a page and answers eight questions: (1) what counts as business travel — define the commuting boundary explicitly, it's where every dispute starts; (2) the rate, and the rule for updating it when the official rate changes (cite this site's source documents or the authorities directly); (3) the capture method — app, template, or form, with the required fields from the log-requirements guide; (4) submission deadline — 30 days keeps you inside "reasonable time" for US accountable-plan purposes and keeps memories fresh everywhere; (5) approval and spot-audit process — distance-check a sample against a mapping tool; (6) proof of insurance — require employees using personal vehicles to confirm appropriate cover, since business use can void a personal-only policy and the gap becomes your problem; (7) the over-cap and over-ceiling treatment — what happens to amounts above the tax-free line; (8) the jurisdiction overlay — the strictest state or award you operate under.
Common employer questions
Should we just pay a flat car allowance instead?
It's administratively simple and almost always tax-inefficient: taxable wages in the US outside an accountable plan, taxable in Canada by definition, payroll-taxed in the UK and Australia. Per-distance reimbursement at or under the official rate delivers the same money to the employee at lower total cost. Flat allowances make sense mainly when distance tracking is genuinely impractical — and apps have mostly eliminated that excuse.
Can we set one global rate for employees in multiple countries?
You can pay one rate; you can't get one tax treatment. A 72.5¢ US-pegged rate is fine in the US, over the AMAP ceiling in the UK (excess taxed), and roughly at prescribed in Canada. The cleaner pattern is one global policy with the rate parameterized per country to the local official figure.
What's our exposure if we reimburse nothing?
Depends entirely on jurisdiction: potentially a wage-and-hour claim in California and similar states, an award-underpayment claim in Australia, mostly a retention problem in the rest of the US, and in the UK your employees quietly claim MAR while resenting you. The trend in litigation and recruitment both runs one direction — toward reimbursing.
Primary sources
- IRS, Publication 463 and accountable-plan rules (Treas. Reg. §1.62-2); IR-2025-128
- California Labor Code §2802; comparable Illinois (820 ILCS 115/9.5) and Massachusetts provisions
- GOV.UK, expenses and benefits: business travel mileage (AMAP and reporting rules)
- CRA, employers' guide on automobile allowances (T4130), via canada.ca
- ATO, allowances and reimbursements guidance; Fair Work modern awards (vehicle allowance clauses)
General information for policy planning, not legal or tax advice. Employment-law mandates in particular are jurisdiction-specific and change — have counsel review a policy before rollout, especially in California-style mandatory-reimbursement states.