Employee travel expenses remain one of the most frequently misunderstood areas of UK tax. Many employers assume that any journey connected to work qualifies for tax relief. HMRC takes a far narrower view. The tax treatment depends on the nature of the journey, the workplace involved, and the employee’s working pattern.
HMRC’s guidance in Employee Travel – A Tax and NICs Guide for Employers (Booklet 490) sets out clear principles. When employers apply these rules correctly, they can reimburse travel expenses without tax or National Insurance consequences. When they apply them incorrectly, HMRC often raises assessments during PAYE reviews.
This guide explains how the rules work in practice.
What HMRC Considers Business Travel
HMRC allows tax-free reimbursement only when a journey qualifies as business travel. Business travel includes journeys that employees must make to perform their duties. Common examples include travelling to client premises, visiting suppliers, attending temporary work locations, or moving between workplaces during the working day.
HMRC does not look at convenience or intention. The journey must arise because of the employment duties themselves. If the journey would not take place without the job requirement, it often qualifies as business travel.
Ordinary Commuting and Why It Fails the Test
While calculating employee travel expenses, ordinary commuting does not qualify for tax relief. HMRC defines ordinary commuting as travel between home and a permanent workplace. This rule applies regardless of start times, finish times, workload, or job seniority.
Many employers fall into error by reimbursing early-morning or late-night travel. HMRC does not allow relief simply because an employee works outside normal hours. Travel between home and a permanent workplace remains private travel for tax purposes.
Understanding Permanent Workplaces
A permanent workplace is any location an employee attends regularly to perform their duties. Regular attendance does not require daily presence. Weekly or predictable attendance patterns often create a permanent workplace.
An employee may have more than one permanent workplace at the same time. When that happens, travel from home to either location counts as ordinary commuting.
Temporary Workplaces and Why They Matter
A temporary workplace is somewhere an employee attends for a limited period or for a temporary purpose. Short-term projects, training locations, or fixed-duration assignments often qualify.
Travel to a temporary workplace usually qualifies for tax-free reimbursement, provided the arrangement remains genuinely temporary. Employers must review assignments continuously. A workplace can start as temporary and later become permanent for tax purposes.
The 24-Month Rule Explained Clearly
The 24-month rule plays a critical role in determining whether travel remains allowable. Travel stops qualifying when an employee expects to attend a workplace for more than 24 months, or when the employee spends 40% or more of their working time at that location over a 24-month period.
The key factor is expectation. Once the employee knows, or should reasonably know, that the assignment will exceed 24 months, travel expenses become taxable from that point onward. HMRC does not reclassify earlier reimbursements, but it does tax future payments.
This rule commonly affects contractors, consultants, and employees assigned to long-running client projects.
Mileage Claims Using Personal Vehicles
Employees who use their own vehicles for business travel can receive tax-free mileage payments within HMRC’s approved limits. HMRC refers to these as Approved Mileage Allowance Payments (AMAPs).
Employee Travel Expenses: Current HMRC approved mileage rates
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Cars and vans
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45p per mile for the first 10,000 business miles per tax year
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25p per mile for business miles above 10,000
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Motorcycles
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24p per mile
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Bicycles
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20p per mile
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Passenger payments
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An additional 5p per mile per passenger, when employees carry colleagues on the same business journey in a car or van
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These rates apply per employee per tax year. They do not reset when vehicles change.
Employee Travel Expenses: What Mileage Rates Cover
Mileage rates cover all normal running costs of the vehicle. This includes fuel, insurance, servicing, tyres, repairs, depreciation, and interest on a vehicle loan. Employees cannot claim additional relief for these costs when they receive mileage payments.
However, employees can claim separate reimbursement for parking charges, tolls, congestion charges, and ferry fees incurred during business travel.
Paying More or Less Than the Approved Rates
When employers pay mileage above HMRC’s approved rates, the excess becomes taxable income and attracts National Insurance. Employers must report the excess through payroll or on form P11D.
When employers pay below the approved rates, employees can claim Mileage Allowance Relief for the difference. Employees usually claim this relief through their Self Assessment tax return or directly from HMRC.
Subsistence and Meals While Travelling
Subsistence expenses include meals, refreshments, and accommodation costs incurred because of business travel. HMRC allows tax-free reimbursement only when the expense arises directly from qualifying travel.
Meals taken during ordinary commuting never qualify, even when employees work long hours or travel outside standard times. HMRC focuses on the nature of the journey, not the length of the working day.
Overnight Accommodation and Incidental Costs
When business travel requires an overnight stay, employers can reimburse reasonable accommodation costs tax-free. HMRC also allows small incidental overnight expenses, such as laundry or personal phone calls, within defined limits.
Employers should ensure accommodation remains reasonable and clearly linked to business needs.
Trips with Both Business and Private Elements
For employee travel expenses, some journeys include both business and private elements. In these cases, employers must apportion costs on a fair and reasonable basis. Employees can claim only the business portion.
When the private element forms the main purpose of the trip, HMRC may treat the entire cost as taxable, even if some business activity occurs.
Hybrid Working and Homeworking Considerations
Working from home does not automatically make travel to the office allowable. If the office remains the employee’s permanent workplace, travel between home and office remains ordinary commuting.
Hybrid working arrangements require careful analysis. Employers should review working patterns regularly and document where employees perform their core duties.
Why HMRC Challenges Travel Expenses So Often
HMRC frequently challenges travel expenses during PAYE inspections. Common errors include misclassifying permanent workplaces, ignoring the 24-month rule, reimbursing commuting costs, and failing to keep adequate records.
These errors often lead to PAYE arrears, Class 1 National Insurance, penalties, and interest.
Record-Keeping and Best Practice
For employee travel expenses, strong record-keeping protects both employers and employees. Employers should keep clear documentation covering journey details, business purpose, mileage logs, receipts, and expected assignment durations. Regular reviews of long-term arrangements reduce risk significantly.
Final Thoughts
Travel expenses qualify for tax-free treatment only when the journey itself meets HMRC’s strict definition of business travel. Titles, labels, and intentions do not override the facts.
Employers who understand permanent and temporary workplaces, apply the 24-month rule correctly, and maintain good records reduce compliance risk and avoid costly HMRC challenges.
