Mileage Reimbursement In The UK: Rates, Rules And Employer Duties

If you’ve got employees driving for work (sales visits, site visits, client meetings, running errands between locations), mileage reimbursement can feel like a small admin task that turns into a regular headache.

What rate should you pay? What counts as business mileage? What records do you need to keep? And what happens if you reimburse too much (or too little)?

This guide breaks down mileage reimbursement for employees in the UK from an employer’s perspective, including typical rates, HMRC rules, and the practical steps you can take to set a clear, compliant process from day one. (This article is general information only and isn’t tax or accounting advice - for your specific circumstances, check HMRC guidance or speak to your accountant/payroll provider.)

What Is Mileage Reimbursement (And When Do You Need To Pay It)?

Mileage reimbursement is where you repay an employee for using their own vehicle to travel for work. It’s usually paid as a rate per mile (e.g. 45p per mile), rather than repaying fuel receipts.

For most small businesses, mileage reimbursement comes up when:

• an employee uses their own car to visit clients or customers;
• staff travel between sites (for example, between a head office and a second workplace);
• your team run business errands in their own vehicles.

There’s no single rule that says you must reimburse mileage in every scenario, but in practice you should be careful here. Mileage and expenses can quickly become:

• a contractual issue (what you promised in the offer letter or employment contract),
• a fairness and retention issue (employees feel out of pocket), and
• a tax and payroll issue (if payments aren’t handled properly).

It’s common to set out your mileage and expenses approach in your Employment Contract and then expand on the “how-to” process in a policy document.

Is Mileage Reimbursement The Same As Travel Time Pay?

Not exactly. Mileage reimbursement is about repaying an employee’s costs of using their vehicle. Whether travel time counts as “working time” (and affects pay, breaks, and working hours) is a separate question.

If your employees travel as part of the job (especially mobile or peripatetic workers), it’s worth keeping an eye on the Working Time Regulations implications too.

What Mileage Rates Can You Pay In The UK? (Including HMRC Approved Rates)

When employers talk about mileage rates, they’re usually trying to balance three things:

• paying a rate that feels fair and realistic;
• keeping costs predictable for the business;
• staying aligned with HMRC’s tax treatment of mileage payments.

HMRC Approved Mileage Allowance Payments (AMAP)

HMRC has “approved” mileage rates known as AMAP rates (Approved Mileage Allowance Payments). These rates are widely used because they provide a simple benchmark and (when applied correctly) can often be paid without creating extra tax/NIC complications.

The commonly used AMAP rates for employees using their own vehicles for business travel are:

• Cars and vans: 45p per mile for the first 10,000 business miles in a tax year, then 25p per mile after that
• Motorcycles: 24p per mile
• Bicycles: 20p per mile

Important: these are general headline figures that many businesses use, but mileage and expenses can get nuanced quickly (especially with mixed business/personal use, commuting vs business travel, and different workplace arrangements). If travel is a big part of the role, it’s worth checking the HMRC position and getting tailored advice from your accountant/payroll provider.

What Happens If You Pay More Than HMRC Approved Rates?

If you reimburse above the approved AMAP rates, the “excess” can be treated as taxable (and may need to go through payroll, with tax and National Insurance implications). In other words, it can stop being a straightforward expense reimbursement and start looking like extra pay.

That doesn’t mean you can’t pay more, but you should decide intentionally and make sure payroll treatment and documentation are correct (and double-check the position with HMRC guidance or your payroll provider if you’re unsure).

What If You Pay Less Than AMAP Rates?

If you pay less than AMAP rates, you’re not automatically doing anything “wrong” as an employer. However, it can create practical issues:

• employees may feel out of pocket, especially with rising fuel/maintenance costs;
• it can become an employee relations issue (and a retention issue);
• if your contract or policies promise a specific rate, paying less could be a breach of contract.

Consistency matters. If you choose a rate and a method, document it and apply it fairly.

What Counts As Business Mileage (And What Doesn’t)?

One of the biggest friction points with mileage reimbursement for employees is deciding what travel qualifies.

As a general guide, business mileage is travel that is necessary for work and not ordinary commuting. Common examples include:

• travel from the workplace to a customer/client site;
• travel between two work sites in the same day;
• travel to attend a work meeting at another location (not your normal place of work);
• travel to collect supplies or deliver items for the business (if part of their duties).

Ordinary commuting is typically travel between home and the employee’s normal workplace. That’s usually not treated as business mileage for reimbursement (unless your contract/policy says otherwise).

What If The Employee Doesn’t Have A Fixed Workplace?

Many small businesses now have staff who are:

• fully remote,
• hybrid (some days at home, some in-office), or
• mobile (travelling to different client sites each day).

In these situations, defining “normal place of work” can be less straightforward. It’s also an area where the legal/contract position and HMRC’s tax concepts of workplaces and travel can differ depending on the facts.

For example, you might specify:

• the employee’s normal place of work (or that it varies),
• when travel from home counts as business travel for your reimbursement policy, and
• what approvals they need before claiming mileage.

This kind of detail often sits alongside other workplace rules in your staff handbook or workplace policy documents, so expectations are clear for everyone.

How To Set Up A Mileage Reimbursement Policy That Actually Works

A mileage policy shouldn’t be a dense legal document that no one reads. For a small business, the goal is simple: a clear process that’s fair, easy to administer, and defensible if questions come up later.

Here’s what we generally recommend covering.

1) Eligibility: Who Can Claim Mileage?

Spell out which roles or circumstances qualify. For example:

• employees required to travel as part of their duties;
• employees using their own vehicle because no company vehicle is provided;
• employees who have manager approval for a specific trip.

2) What Vehicles Are Covered?

Be specific about whether you reimburse:

• cars and vans (personal vehicles),
• motorcycles,
• bicycles,
• taxis/public transport (this is often a separate “travel expenses” category).

3) The Rate You’ll Pay

Set the pence-per-mile rate and whether it changes after a mileage threshold. If you align to HMRC AMAP rates, say so.

Also decide whether the rate covers everything (fuel, wear and tear, servicing), or whether there are any extras you’ll reimburse separately (generally, businesses try to avoid “extras” unless there’s a clear reason).

4) Claim Requirements (What Proof You Need)

This is the part that prevents disputes. Your policy should clearly require a mileage log including:

• date of travel;
• start and end location;
• purpose of the trip (client meeting, site visit, etc.);
• miles travelled;
• any supporting notes (e.g. job number, client name, meeting reference).

Many businesses use an expense claim form or an expense management app, but the key is consistency and records.

5) Approval And Fraud Prevention

You don’t need to treat your team like they’re doing the wrong thing, but you do need a basic control process (especially as you grow). Common approaches include:

• requiring manager approval for trips above a threshold;
• spot-checking claims against diaries/calendar entries;
• requiring claims within a set time period (e.g. within 30 days);
• stating clearly that false claims may be treated as misconduct.

If you do use GPS tracking or apps that collect personal data, make sure you handle it transparently and lawfully. This is where a clear Privacy Policy (and internal privacy notices, where appropriate) can help set expectations about what data is collected, why, and how long it’s retained.

6) Payment Timing And Payroll Treatment

Decide when mileage is paid:

• with the next payroll run,
• weekly, or
• as an ad-hoc reimbursement.

If you run mileage through payroll, it’s easier to keep a single audit trail. But you still need to ensure you’re treating it correctly for tax purposes and not accidentally classing reimbursements as taxable pay (if in doubt, confirm the approach with your accountant or payroll provider).

And yes-mistakes happen. If you overpay expenses and need to recover them, it’s worth understanding the practical and legal risk points around wage overpayments before you make deductions.

Record Keeping, Tax, And Audit Trails: What Employers Should Watch For

Mileage reimbursement is one of those topics where “we’ll keep it informal” can come back to bite you.

Even if your team is small and trusted, you should be able to show:

• what your policy is,
• why the travel was for work, and
• how you calculated the reimbursement.

How Long Should You Keep Mileage Records?

There isn’t one universal retention period that fits every business, but as a rule, you should keep payroll and expense records long enough to deal with tax queries, audits, and disputes.

A simple approach many small businesses take is to keep mileage logs and expense claims alongside payroll records, and apply a consistent retention period across your HR/admin systems.

VAT Receipts And Invoicing (Where Relevant)

Mileage is often reimbursed as a rate-per-mile without receipts, so it’s different from repaying specific fuel invoices. But if your employees also incur other travel costs (parking, tolls, public transport), there may be VAT and record-keeping considerations depending on what’s being reimbursed, who the supply is made to, and what receipts you hold.

It’s a good idea to keep your wider expenses process aligned with your finance admin so it’s easy to support claims and payments. If VAT is relevant to your business, check HMRC guidance or speak to your accountant about what you can and can’t reclaim.

Don’t Forget Insurance And Safety

This is less about tax and more about risk management. If employees drive for work, you should consider whether you need to require evidence of:

• a valid driving licence;
• appropriate motor insurance that covers business use (where relevant);
• a valid MOT (if applicable);
• basic roadworthiness checks.

These checks can feel awkward to introduce, but they can be important if an accident occurs “on the job” and questions are asked about what the business did to manage the risk.

Common Mistakes With Mileage Reimbursement (And How To Avoid Them)

Most problems we see aren’t about a business trying to do the wrong thing. They’re usually caused by unclear rules, inconsistent practices, or paperwork that’s done “later”.

1) Mixing Up Commuting And Business Travel

This is the big one. If you reimburse ordinary commuting in some cases but not others, you can quickly create confusion and perceived unfairness.

Fix: define what counts as business mileage in writing, and give examples that match your business reality (remote work, client sites, multiple locations, etc.).

2) Paying A Rate Without Checking The Tax Treatment

Paying a flat rate “because it feels fair” might be fine commercially, but you should still check whether the rate is within HMRC approved mileage rates and what happens if it isn’t.

Fix: choose a rate intentionally, document it, and make sure your payroll/finance process supports correct treatment.

3) Letting Claims Pile Up

If employees submit claims months late, it becomes harder to verify travel and harder to manage cash flow.

Fix: set a deadline (e.g. submit within 30 days) and a routine (e.g. monthly claims, paid next payroll).

4) Not Aligning Your Contract And Policies

Imagine an employee’s contract says they’ll be reimbursed for “all work travel”, but your policy later tries to restrict what’s claimable. That gap can create a dispute.

Fix: make sure the basics are covered in the contract, then set out the process and definitions in a policy. If you’re hiring, updating roles, or scaling, it’s worth getting your Employment Contract wording reviewed so it matches how you actually operate.

5) Collecting Location Data Without Thinking About Privacy

If you require employees to use an app that tracks location, that can be personal data (and potentially sensitive in context). Even if you have a legitimate reason, you should approach it carefully and transparently.

Fix: be upfront about what you collect and why, keep the data only as long as needed, and avoid “collecting everything just in case”.

Key Takeaways

• Mileage reimbursement for employees is usually paid when staff use their own vehicles for work travel (not ordinary commuting), and it’s best handled with a clear policy and consistent records.
• Many UK employers use HMRC’s approved mileage rates (AMAP) as a practical benchmark, because paying above these rates can create tax/NIC consequences for the “excess”.
• Defining what counts as “business mileage” is critical-especially for remote, hybrid, and multi-site roles where commuting vs business travel can be less obvious.
• A workable mileage policy should cover eligibility, rate, what evidence is needed, approval steps, claim deadlines, and how/when reimbursements are paid.
• Keep a solid audit trail (mileage logs and expense records) and consider basic driving/insurance checks to reduce safety and liability risks when employees drive for work.
• If you’re using apps or GPS-based logging, treat location information carefully and set clear expectations about data handling and retention.

If you’d like help putting a clear mileage and expenses process in place (or updating your employment documents so they match how your business actually runs), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.