Home / MOT Cost by Age
MOT Cost by Car Age: Same Fee, Different Repair Bill
The MOT test fee is identical at every car age. The cost trajectory comes from rising failure rates and rising repair bills. A 3-year-old car averages £97 total MOT spend; a 15-year-old car averages £417. This page maps the year-by-year economics and helps spot the right moment to retire a car.
Test fee, all ages
£37
UK average
3-year total avg
£97
First MOT
10-year total avg
£247
Mid-life
15-year total avg
£417
Old age
Year-by-Year MOT Budget
| Car age | Test fee | Fail rate | Expected repair | Total budget |
|---|---|---|---|---|
| 3 years (first MOT) | £37 | 11% | £60 | £97 |
| 4 years | £37 | 14% | £80 | £117 |
| 5 years | £37 | 18% | £110 | £147 |
| 6 years | £37 | 21% | £140 | £177 |
| 8 years | £37 | 26% | £170 | £207 |
| 10 years | £37 | 32% | £210 | £247 |
| 12 years | £37 | 38% | £250 | £287 |
| 15 years | £37 | 52% | £380 | £417 |
| 18+ years | £37 | 60%+ | £500+ | £537+ |
The Three Cost Phases of Car Ownership
Looking at the year-by-year table, three distinct phases emerge.
Phase 1: Year 3-7 (low cost). Total MOT spend averages £97-200. Failure rates are 11-21%. Common fails are bulbs, tyres and minor advisory items. Most owners can budget £150 per year for MOT and rarely exceed it.
Phase 2: Year 8-12 (steady increase). Total MOT spend climbs from £207 to £287. Failure rates 26-38%. Suspension and brake-system repairs become routine. Budget £250-350 per year, with occasional larger bills.
Phase 3: Year 13+ (the turning point). Total MOT spend exceeds £300 routinely. Failure rates 40%+. Multi-category fails become common, and any single MOT can produce a quote that exceeds the car's scrap value. The decision to keep or retire becomes annual.
When Running Cost Beats Car Value
The classic decision rule: when annual MOT-related cost exceeds 30-40% of the car's trade value, retirement is usually the right call.
Worked example. A 14-year-old Ford Focus with 95k miles, trade value £1,800. Annual MOT spend averaging £350, with one £900 quote this year for sill welding. The annual running cost of £1,000+ approaches 60% of the car's value. Retirement is rational.
Counter-example. A 14-year-old Toyota Corolla with 80k miles, trade value £3,200. Annual MOT spend averaging £200, no major welded repairs in sight. The 6-7% ratio is sustainable; keep the car.
The trade-value check is free and takes minutes. WeBuyAnyCar, Carwow trade-in, and ScrapCarComparison all give instant figures. Do this annually after the MOT to inform the next-year decision.
How to Slow the Age-Related Cost Curve
Several proven practices push the cost curve to the right.
1. Annual servicing. A £180-280 annual service catches problems before they become MOT fails. Brake pads replaced at service cost less than brake pads replaced as a retest urgency. Suspension noises diagnosed at service rarely cost more than £50; the same noise becoming a failure at MOT can cost £300+.
2. Underbody protection. Apply a wax-based underseal (Dynax, Bilt Hamber, Waxoyl) at year 5-6. The £80-150 application pushes structural corrosion back by 3-5 years. This is the single most cost-effective investment for cars expected to reach 15+ years.
3. Winter washing. UK road salt accelerates corrosion. Three or four full underbody washes per winter (most automatic car washes include this for an extra £3-5) reduce the structural-corrosion failure rate measurably.
4. Use a pre-MOT check. A £20-50 inspection a few weeks before the test catches imminent failures and lets you shop around for repair quotes rather than accepting the testing garage's urgent quote. See the pre-MOT checklist page.
The First-MOT Special Case
New cars are exempt from MOT for the first 3 years from registration. The first MOT is therefore the lowest-cost MOT in a car's life: 11% failure rate, mostly tyre wear and bulb issues, average total spend £97.
Common questions at first MOT:
- When exactly is it due? Three years from date of first registration on the V5C. Not the manufacture date.
- Where should I take it? Anywhere with an authorised testing station. Dealer service department is one option but typically pricier; an independent or chain often serves the same need.
- Will it affect my warranty? Taking the MOT at an independent garage does not affect manufacturer warranty (Block Exemption rules). Repair work outside the warranty network may, depending on the manufacturer.
More on the first MOT on the first MOT page.
Frequently Asked Questions
Does MOT cost rise with car age in 2026?
The test fee itself is identical at every age (£37 typical, £54.85 max). The total cost rises because the probability of failure rises with age, and the repair bill when failure happens also grows. A 3-year-old car averages £97 total MOT spend; a 15-year-old car averages £417.
Why does the failure rate climb so sharply after 10 years?
Three structural reasons. First, suspension and brake-line corrosion accelerate after 8-10 years on UK roads. Second, individual components (shocks, springs, bushes) have failure curves that all crest in the 10-15 year band. Third, the cost-benefit of preventative servicing shifts; many owners stop investing in older cars, which compounds the failure rate.
When does running cost beat car value?
Typically around year 14-18 for mainstream cars, but it depends heavily on make and model. A 15-year-old Toyota with 90k miles may still be worth £2,000 and warrant £400 of MOT-related repair. A 15-year-old Ford with 110k miles worth £1,000 facing a £900 sill repair makes no economic sense. Check current trade-in value before committing to major repairs.
Which cars resist age-related MOT cost the best?
Japanese cars, particularly Toyota, Honda and Mazda, consistently show lower MOT failure rates in DVSA data than European cars at the same age. They tend to corrode less, have more durable suspension components, and use simpler emissions systems. German premium cars (BMW, Audi, Mercedes) often have higher failure rates after 10 years due to electronic and emissions complexity.
How does the first MOT differ from later ones?
The first MOT happens 3 years after the date of first registration shown on the V5C. Failure rates are at their lowest (about 11%) because cars at this age have minimal wear. Common first-MOT fails are bulbs and tyre tread issues from spirited driving. The test itself is identical to later MOTs; only the wear baseline is different.
Are EVs cheaper to MOT as they age?
Yes, modestly. EVs have no exhaust emissions check, no gearbox, no spark plugs, no fuel system. The brake-pad wear is slower due to regenerative braking. The trade-off is that the few components that do wear (tyres, suspension under the heavier battery weight) can be more expensive. Net: EV MOT bills typically average 10-20% lower than ICE equivalents of the same age.
The full failure rate breakdown
DVSA data on how likely each car age is to fail and which categories drive the rate.
Failure Rate by Age