MOT test explained: costs, what's checked and what happens if you fail

The MOT is one of those tests every UK driver runs into every year, yet the rules around cost, retests and what's actually being checked are easy to get muddled. Here's a plain-English rundown of how it works.

For a standard car (DVSA "Class 4"), the maximum fee a test centre can legally charge is £54.85. That cap has been frozen since 2010, and it's a ceiling, not a fixed price — plenty of independent garages and council-run test centres charge less, commonly somewhere in the £35-£45 range, so it's always worth asking what a local garage actually charges rather than assuming you'll pay the full amount. Motorcycles have a separate, lower cap of £29.65, and larger Class 7 vans are capped at £58.60. If your car fails and needs a full retest outside the free-retest window covered below, the retest fee is capped at £27.43.

An MOT covers a genuinely broad checklist — over 60 individual checks spread across seven main categories: brakes, tyres, steering, suspension, lights, seatbelts, horn, mirrors, wipers and windscreen condition, exhaust emissions, the fuel system, and the vehicle's structure. It's worth being clear about what an MOT is and isn't, though: it's a snapshot check of whether your car meets legal road safety and environmental standards on the day of the test, not a full assessment of its overall mechanical health the way a proper service is. A car can pass its MOT and still have things worth attending to that a mechanic would flag during a service. Since May 2018, anything found is categorised as dangerous, major or minor — a minor defect doesn't stop the car passing, though it should still be fixed, while a major or dangerous defect means a fail.

If your car does fail, what happens next depends on timing. If the fault falls into a specific DVSA list of eligible items and you get it fixed and bring the car back to the same test centre by the end of the next working day, the retest is free. More broadly, if the car stays with the test centre — or is repaired there — and is retested within 10 working days of the original test (weekends and bank holidays don't count towards that window), the retest is generally free or reduced; if you've had the repair done elsewhere within that window, a smaller partial retest fee can apply. Once you go past the 10 working day mark, though, the test centre has to carry out a full MOT again, at the full fee, even if only one or two items failed the first time. So if your car fails, it's worth getting repairs booked promptly rather than letting the clock run down.

On timing more generally: a brand new car doesn't need its first MOT until the third anniversary of its registration date in England, Scotland and Wales (Northern Ireland works slightly differently, using the fourth anniversary). You can get the first test done up to one month minus a day before that anniversary without losing the original due date going forward — useful if you'd rather not be renewing your MOT at an inconvenient time of year. After that first test, it's an annual requirement for as long as you keep the car.

One tool worth knowing about, particularly if you're buying a used car, is the DVSA's free MOT history checker at gov.uk/check-mot-history. Enter a registration number and it shows the full test history for any car tested since 2005 — pass or fail, recorded mileage at each test, and the specific reasons for any failures or advisories. It's a quick way to spot a car with a pattern of recurring issues, or a mileage reading that doesn't add up, before you commit to buying it.

Ultimately, the MOT exists to catch genuinely unsafe or heavily polluting vehicles, not to catch drivers out. Keeping an eye on the basics between tests — tyre tread, working lights, a windscreen free of chips in your eyeline — makes a first-time pass far more likely, and a quick pre-MOT check with a trusted local garage can flag anything borderline before you're paying for a failed test and a second visit.

Frequently asked questions