Understanding HMRC travel and subsistence expense compliance is essential for any UK business that reimburses employees for work-related travel—and the financial consequences of getting it wrong can be significant. HMRC audits can result in backdated tax liabilities, National Insurance contributions, and penalties that far exceed the original expense claims, making non-compliance a material financial and legal risk rather than a minor administrative concern. This article covers the key rules UK employers must understand, including qualifying criteria for travel and subsistence claims, HMRC-approved subsistence rates, the 24-month temporary workplace rule, and the evidence standards required to withstand scrutiny. Whether you are reviewing your current expense policy or evaluating how to tighten controls at scale, this guide provides the practical framework you need to manage compliance with confidence.
HMRC Mileage Allowance Rates and the 24-Month Temporary Workplace Rule #
HMRC sets Approved Mileage Allowance Payment (AMAP) rates that define how much employers can reimburse employees for using their own vehicles on business travel without triggering a tax liability. For cars and vans, the rate is 45p per mile for the first 10,000 miles in a tax year, dropping to 25p per mile beyond that threshold. Motorcycles are reimbursed at 24p per mile, and bicycles at 20p per mile, regardless of distance. Payments within these limits are free of Income Tax and National Insurance. If an employer pays less than the AMAP rate, the employee can claim Mileage Allowance Relief directly from HMRC for the shortfall.
Separately, the 24-month rule governs whether a workplace qualifies as ’temporary’ — a status that determines whether travel costs are tax-deductible at all. A temporary workplace is one where an employee attends for a limited purpose or duration, rather than as a base of regular, ongoing work. Travel to a temporary workplace can be claimed as a business expense. However, once it becomes realistic to expect that attendance at a single location will exceed 24 months — or once the employee has actually attended for 24 months — HMRC reclassifies that site as a permanent workplace. From that point, commuting costs become personal expenditure and are no longer tax-deductible.
The rule can reset if the nature of the work genuinely changes or if a significant break in attendance occurs. Employers should monitor placement durations carefully, particularly for contractors or project-based staff, as exceeding the threshold creates a retrospective tax exposure for both the individual and potentially the organisation.
Subsistence Allowance Eligibility and Qualifying Journey Conditions #
For a subsistence claim to be valid under HMRC rules, the employee must first be travelling on a qualifying journey. HMRC defines this as travel to a temporary workplace — a location where the employee works for no more than 24 months, or where attendance does not constitute the whole or main part of their duties. A permanent workplace, such as a regular office the employee commutes to daily, does not qualify. Once an employee has been attending the same workplace for 24 months or expects to be there for the foreseeable future, that site becomes a permanent workplace and subsistence claims cease to be permissible.
Once a qualifying journey is established, the employee must also be away from their normal place of work for a sufficient duration to justify a meal or accommodation claim. HMRC’s benchmark subsistence rates for 2026 are: £5 for absences of at least five hours, £10 for absences of at least ten hours, and £25 for overnight stays (with an additional £10 if the employee returns home late). These are ceiling amounts, not automatic entitlements — the employee must have actually incurred a cost and must hold a receipt as evidence.
Common scenarios where claims are not permitted include an employee eating lunch near their usual office, a contractor whose temporary placement has exceeded 24 months, or a claim submitted without supporting receipts. A valid claim, by contrast, would be a field engineer travelling to a client site for a one-day visit lasting over ten hours. Finance teams should confirm both journey qualification and expenditure evidence before approving any subsistence claim.
Evidence and Documentation Requirements for Compliant Expense Claims #
Substantiating travel and subsistence claims to HMRC’s satisfaction requires more than a signed-off expense form. For each claim, employers should retain the original receipt or invoice showing the supplier name, date, amount, and nature of the purchase. For mileage claims, a detailed mileage log is essential — recording the date of travel, origin and destination, purpose of the journey, and total miles driven. Where employees use public transport, tickets or booking confirmations serve as the primary evidence.
Records must generally be kept for a minimum of six years from the end of the relevant tax year, in line with HMRC’s standard retention requirements for employer records. Digital copies are acceptable provided they are a faithful reproduction of the original.
Finance teams carry a specific verification burden that goes beyond checking receipts. Before approving a subsistence claim, teams must confirm four things: whether the journey itself qualified as business travel to a temporary workplace, whether the meal or refreshment was eligible under HMRC rules (for example, that a qualifying absence condition was met), whether the right evidence was provided, and whether the claim followed internal company policy.
Inadequate documentation creates serious exposure during an HMRC audit. If an employer cannot produce records to justify why a payment was treated as non-taxable, HMRC may reclassify the reimbursement as a taxable benefit, triggering unpaid income tax and National Insurance contributions, along with potential penalties and interest. Finance teams should treat documentation standards as a compliance control, not an administrative formality.
Setting Company Expense Policies and Approval Workflows #
A well-constructed expense policy does more than set spending limits — it creates a consistent, auditable framework that reduces fraud, prevents errors, and keeps your business aligned with HMRC rules. Without one, finance teams are left manually assessing whether each journey qualified, whether a meal was eligible, whether evidence was provided, and whether the claim followed any agreed process. At scale, that inconsistency becomes expensive.
Start by defining spending thresholds for each expense category. Meals, accommodation, and transport should each carry their own daily or per-trip limits, informed by HMRC’s benchmark subsistence rates where applicable. Setting a meal allowance that aligns with HMRC’s approved amounts means qualifying reimbursements can be paid without triggering a tax liability for the employee.
Next, establish clear approval authority thresholds. A standard claim might route directly to a line manager, while anything exceeding a set value — say, £500 — requires sign-off from a department head or finance director. Define this explicitly so employees know before they spend, not after.
For non-standard claims — such as extended trips, international travel, or client entertainment — document a separate workflow requiring pre-approval rather than retrospective sign-off. This prevents policy exceptions from becoming the norm.
Finally, anchor the entire policy to HMRC compliance. Reference the 24-month rule for temporary workplaces, the approved mileage allowance payment rates, and the requirement for receipts as evidence. Review the policy at least annually, particularly when HMRC rates are updated, to ensure your thresholds remain both competitive and compliant.
Tax Relief Implications for Employers and Employees on Travel Reimbursements #
When an employer reimburses an employee for a qualifying business travel expense, the payment is generally free of income tax and National Insurance Contributions (NICs) for both parties — provided the reimbursement meets HMRC’s conditions. A qualifying expense is one incurred wholly, exclusively, and necessarily in the performance of the employee’s duties, covering travel to a temporary workplace rather than a regular commute.
Where reimbursements fall outside these conditions — for example, covering a journey that HMRC would classify as ordinary commuting — the payment becomes a taxable benefit. The employer must then report it via payroll or a P11D, and both employer and employee NICs become liable. Employer NICs currently sit at 13.8%, meaning unqualified reimbursements carry a direct additional cost beyond the face value of the expense.
To simplify administration, employers can apply to HMRC for a PAYE Settlement Agreement (PSA), which allows the business to settle any tax and NIC liability on minor or irregular benefits in a single annual payment, rather than processing adjustments through individual payroll records. This reduces administrative burden but does not eliminate the underlying liability.
For mileage, reimbursing at or below HMRC’s AMAP rates — currently 45p per mile for the first 10,000 business miles in a personal vehicle — is tax and NIC-free. Payments above this threshold are taxable.
Practically, businesses should maintain clear expense policies that distinguish qualifying journeys from commuting, require receipts or mileage logs as evidence, apply AMAP rates consistently, and conduct periodic audits to ensure claims remain within HMRC’s rules. Solid documentation is the primary defence in any HMRC review.
Building a Compliant and Scalable Expense Management Framework #
Staying ahead of HMRC travel and subsistence compliance requires more than good intentions — it demands clear policies, consistent documentation, and scalable processes that hold up under scrutiny. Businesses that take a proactive approach reduce their exposure to penalties, protect employees from unexpected tax liabilities, and build a stronger foundation for financial governance. Robust expense management software plays a critical role here, automating policy enforcement and audit trails at the scale that manual processes simply cannot sustain. As a practical next step, review your current expense policy against HMRC’s travel and subsistence guidelines and assess whether your existing tools give you the visibility and control needed to evidence compliance with confidence.