MAP vs Self-Claim Mileage UK 2026: Employer Reimbursement or P87 Claim

When an employee uses their own car for business journeys, the cost of running the car for those journeys can be recovered through one of two paths: a Mileage Allowance Payment (MAP) directly from the employer, or a Mileage Allowance Relief (MAR) claim by the employee against HMRC. The choice — usually constrained by the employer’s reimbursement policy — has different tax, cashflow, and administrative implications.

For the actual AMAP rates (55p/25p for cars in 2026-27; 45p/25p for 2025-26 and earlier), see the HMRC Mileage Allowance Rates 2026-27 page and HMRC Mileage Rates 2025-26 + 2026-27. For the per-mile calculation, see the Mileage Allowance Calculator.

1. Three paths, three outcomes

Mileage Allowance Relief is tax relief, not a cash reimbursement: in Paths B and C the employee recovers only the tax (at their marginal rate) on the shortfall, not the shortfall itself. Only Path A puts the full 55p/25p in the employee’s pocket.

2. Cashflow comparison — Path A vs Path C

The administrative and cashflow gap between full AMAP from employer and full self-claim is meaningful:

Path A — Full AMAP from employer

A sales rep driving 5,000 business miles in 2026-27 and reimbursed at 55p/mile:

• Cash inflow during year: 5,000 × 55p = £2,750 (tax-free).
• Tax effect: zero.
• Timing: paid monthly with salary, immediate cashflow.

Path C — Self-claim via P87

Same employee, 5,000 business miles, employer pays nothing:

• Cash outflow during year: ~5,000 × current real cost per mile (~25p-40p in 2026) = £1,250-£2,000 out of pocket for fuel, insurance, depreciation share.
• Tax effect: Claim 5,000 × 55p = £2,750 as Mileage Allowance Relief on Form P87. Tax saved: 20% × £2,750 = £550 (basic rate) or 40% × £2,750 = £1,100 (higher rate).
• Timing: a claim for the current tax year is usually dealt with by adjusting your tax code; a claim for an earlier year is paid as a refund or a tax code adjustment, at HMRC’s choice.

Net loss to employee in Path C vs Path A: £2,750 reimbursement vs £550-£1,100 refund = the employee bears £1,650-£2,200 of real cost. Plus the delay of 3-12 months for the refund.

The choice between Path A and Path C is almost always controlled by the employer, not the employee. Employees in industries with reimbursement (sales, healthcare, professional services) typically receive AMAP. Employees in industries without (administrative, manufacturing) self-claim.

3. Path B — Employer pays partial AMAP, employee tops up via MAR

The most common middle ground: employer pays a flat per-mile rate below AMAP (often 25p-35p), employee claims the shortfall.

Worked example: 25p reimbursement, 5,000 miles

• Employer pays: 5,000 × 25p = £1,250 tax-free.
• AMAP entitlement: 5,000 × 55p = £2,750.
• Shortfall: £2,750 − £1,250 = £1,500.
• MAR claim on P87: £1,500.
• Tax refund: 20% × £1,500 = £300 (basic) or 40% × £1,500 = £600 (higher).
• Total recovery: £1,250 (employer) + £300-£600 (HMRC refund) = £1,550-£1,850.

The employee gets the AMAP relief on the shortfall, partially offsetting the difference. Employer pays less than full AMAP but the employee still recovers most of the cost.

This is the most common arrangement for two reasons:

1. Employer reduces direct payroll cost.
2. Employer avoids the administrative burden of tracking exact business miles per employee (a flat 25p is administratively simpler than verifying the 10,000-mile threshold).

4. P87 vs Self Assessment — when to use which

The Mileage Allowance Relief claim mechanism depends on the total claim size and existing Self Assessment status.

Form P87 (Mileage Allowance Relief)

Use for:

• Total claim for the year of £2,500 or less.
• Not otherwise required to file Self Assessment.

Process:

1. Download Form P87 from GOV.UK or use the online service.
2. Complete with mileage records (dates, destinations, miles).
3. Submit by post or online. For a postal claim you must use form P87 itself; HMRC rejects postal claims that do not.

Self Assessment

Use for:

• Total MAR claim above £2,500/year.
• Already required to file SA for any other reason (self-employed, dividend income > £10,000, etc.).

Process:

1. Include mileage in employment-related expenses on the SA tax return.
2. Submit by 31 January following the tax year end (online deadline; 31 October for paper).
3. Refund offset against SA balance, or issued separately if balance is in refund position.

SA claims have a slower processing time but integrate with all other tax matters.

5. The £2,500 P87 cap — why it matters

The £2,500/year cap on P87 claims is the boundary between simple-relief and full-SA filing. At 55p/mile (2026-27 rate with no employer reimbursement), £2,500 of relief corresponds to about 4,545 miles. Beyond that, the employee crosses into Self Assessment.

This creates a moderate planning friction:

• An employee at 4,000 miles/year: comfortably in P87 territory (4,000 × 55p = £2,200).
• An employee at 5,000 miles/year: a claim of £2,750 if the employer pays nothing (5,000 × 55p) is over the £2,500 P87 limit, so Self Assessment is needed; stays within the P87 limit if the employer pays at least 5p/mile (claim £2,500 or less).
• An employee at 12,000 miles/year: SA required — first 10,000 × 55p = £5,500 plus next 2,000 × 25p = £500, total £6,000 claim exceeds £2,500.

Employees at the boundary should ensure their employer can move them onto MAP reimbursement to avoid the SA filing burden.

6. Records required for MAR

Whether claiming via P87 or SA, HMRC requires the same contemporaneous records:

• Date of journey.
• Reason (specific business purpose).
• From and to addresses.
• Miles driven.
• Vehicle used (if multi-vehicle household).

The mileage records should be summarised by tax year for the claim, and the underlying detail kept in case of an HMRC enquiry — for a Self Assessment claim, GOV.UK’s minimum is 22 months after the end of the tax year (for a return filed on time), and longer is prudent.

In practice, app-based mileage tracking (MileIQ, TripLog, simple Google Maps Timeline) is sufficient. A spreadsheet with the five columns above works. HMRC asks for a copy of your mileage log with the claim (reason for each journey, start and end postcodes), so have it ready before you file.

7. National Insurance — where MAP vs MAR diverges

The key difference between MAP (employer reimbursement) and MAR (employee self-claim) is on the NI side:

The 15% employer NI on excess MAP is a real cost — employers paying above AMAP cost themselves both the over-payment and the NI on the over-payment. This is why most employers stay at or below AMAP rates.

8. Pension and student loan effects

Tax-free AMAP reimbursement (Paths A and B-employer portion) is not taxable pay and is outside Class 1 NIC earnings, so it does not count towards student loan repayments. The MAP doesn’t push the employee into higher tax brackets or student loan repayment thresholds.

MAR refunds (Paths B-employee portion and C) similarly don’t count — they are refunds of tax already paid, not new income.

This makes mileage reimbursement one of the few employee expense reimbursements with zero indirect cost on the employee — no student loan trigger, no PA taper effect.

9. The decision matrix

For an employee with control over the arrangement (negotiating salary or expenses package):

• High mileage (>10,000/year): Push for full MAP at AMAP rates. The 25p/mile beyond 10,000 still beats no reimbursement.
• Variable mileage (5,000-15,000/year): Push for MAP at 55p. The 10,000-mile threshold makes the per-mile rate predictable for budgeting.
• Low mileage (<5,000/year): MAP at AMAP, or accept partial + self-claim.
• Travel-heavy industry (sales, healthcare): MAP is standard; if not offered, raise it in compensation negotiation.

For an employee without control:

• Always claim MAR if employer pays below AMAP.
• File P87 each year if your total claim is £2,500 or less.
• Move to SA if above £2,500 to capture full relief.

For a self-employed individual, the AMAP option is the simplified method — see HMRC Mileage Rates 2025-26 section 6. For the current rate table, see HMRC Mileage Allowance Rates 2026-27.

10. Common pitfalls

• Forgetting to claim MAR when employer pays below AMAP. Employees in administrative roles often don’t realise they can claim — the £200-£900 / year tax refund is missed.
• Claiming non-qualifying mileage. Commuting from home to permanent workplace is not eligible. Many failed P87 claims include commuting miles incorrectly.
• Missing the 4-year time limit. MAR can be claimed for the current and previous 4 tax years. A claim made during 2027-28 can cover 2027-28 and the four previous years (2026-27 back to 2023-24); 2022-23 would be out of time. Earlier years are barred.
• Calculating relief at the wrong rate. The MAR claim is the full AMAP entitlement minus what employer paid, not the tax saved on that amount. The tax saving is the marginal-rate refund on the relief.
• Not retaining mileage records. HMRC compliance checks have rejected MAR claims where records were not contemporaneous.

Sources

• GOV.UK — Tax relief for employees: travel and overnight expenses
• GOV.UK — Claim Income Tax relief on business mileage (Form P87)
• HMRC Manual EIM31330 — Mileage Allowance Relief (MAR): outline
• Section 231 ITEPA 2003 (Mileage Allowance Relief)