MOT Retest Rules and Fees: When You Pay and When You Do Not

The retest rules are the most useful piece of MOT administration that almost nobody reads. They are more generous than drivers expect, they are set by DVSA rather than left to the garage's discretion, and understanding them can be the difference between paying nothing and paying a second full test fee.

Everything below concerns the fee for the test itself. Repair costs are a separate commercial matter between you and the garage, and no rule caps them.

The three routes through a retest

When a vehicle fails, there are effectively three ways back to a pass, and they differ in cost.

Two conditions run across all of the free and reduced options. The vehicle must go back to the same vehicle testing station that failed it, and that station must not have changed ownership in between. Both are absolute.

Route one: leave the vehicle at the test station

The simplest and cheapest route. If the vehicle stays at the station where it failed, is repaired there, and is retested before the end of the tenth working day following the day of the initial test, only a partial retest is required and no fee may be charged for it.

The logic is straightforward. The car has not left the premises, so the tester knows nothing else has changed and does not need to re-examine everything.

One detail has changed from how this rule used to work and still catches people out: leaving the vehicle at the station does not qualify you indefinitely. If the re-examination is not carried out within that ten working day period — because a part is on back order, or the work has been sitting in a queue — the vehicle needs a full test and the full fee may be charged. If a repair is going to run long, say so early and ask the station to book the retest inside the window.

Route two: the free next-working-day retest

This is the route for the small, quick fixes, and it is the one most worth knowing about.

If you take the vehicle away, repair it yourself or elsewhere, and bring it back to the same test station before the end of the next working day on which testing is carried out, there is no additional fee — provided the vehicle failed only on one or more items from a specified list.

The specified items list

The list is published by DVSA and covers defects that can be re-checked visually, without ramps, rollers or measuring equipment:

• Access panels, bonnet, boot lid, tailgate, tailboard, loading door and dropsides
• Doors, including hinges, catches and pillars
• Battery and electrical wiring
• Brake pedal anti-slip surface
• Fuel filler cap
• Horn
• Lamps, excluding headlamp aim
• Headlamp cleaning or levelling devices, where no headlamp aim check is needed
• Main beam warning light
• Mirrors and rear reflectors
• Registration plates and the vehicle identification number
• Seatbelts, but not their anchorages, plus load limiters and pre-tensioners
• Seats and the steering wheel
• Sharp edges or projections
• Towbars, excluding the bodywork around anchorage points
• Trailer electrical sockets
• Tyre pressure monitoring system
• Windscreen glass, wipers and washers
• Wheels and tyres, other than on motorcycles

Class 5 passenger vehicles have several additional entries covering emergency exits, steps, stairs, break-glass hammers and door controls.

What is conspicuously absent matters just as much. Headlamp aim is excluded. So are brake performance, emissions, suspension, steering play and structural corrosion. Those items cannot be re-checked without putting the vehicle back on equipment, so a failure on any of them takes you out of this route entirely, even if you return within the hour.

Route three: the 10-working-day partial retest

If you remove the vehicle for repair and return it to the same station before the end of the tenth working day following the day of the original test, only a partial retest is required — but a fee may be charged for it.

That fee is capped. It must not exceed half the statutory maximum test fee for the vehicle's class. For a class 4 car, where the maximum full fee is £54.85, a partial retest cannot cost more than about £27. A garage is free to charge less, and many charge nothing at all for straightforward jobs, particularly where they have done the repair work.

This is the route that covers most real failures: a brake pipe replaced by a local garage, a spring changed at home over a weekend, an emissions problem sorted by a specialist. It applies regardless of which items failed.

When you pay the full fee again

You are back to a complete test, at up to £54.85 for a car, in any of these situations:

• You take the vehicle to a different test station for the retest.
• More than ten working days have passed since the original test.
• The vehicle stayed at the station but was not re-examined inside the ten working day window.
• You have already used your one partial re-examination for that test.

That last point deserves emphasis. Only one partial re-examination is permitted per full examination. If your car fails the partial retest — because the repair did not resolve the defect, or because a second problem has appeared — the next test is a full one at the full fee. There is no sequence of cheap retries.

What "working days" actually means

Working days exclude weekends and bank holidays. They also mean days on which the station carries out testing, which is why the next-working-day rule is phrased around the next working day on which testing is carried out rather than simply the next day.

A failure on the Friday before the late August bank holiday, at a station closed on Sundays, gives you until the end of Tuesday for the next-day route, not Saturday. That is a meaningful difference when you are waiting on a part.

The safest approach is to ask the station to tell you the exact date your window closes and write it down, rather than counting it yourself and being one day out.

A worked example

Take a car that fails on a Wednesday with two defects: a headlamp not working, and a front brake disc worn below the limit.

The headlamp on its own would qualify for the free next-working-day route, because lamps are on the specified list. The brake disc is not on that list and cannot be re-checked without the vehicle going back on the ramp and through a brake performance test. Because the vehicle failed on an item outside the list, the next-day route is closed regardless of how quickly you return.

The realistic options are therefore two. Leave the car at the station, have the disc and the bulb done there, and be retested by the end of the following Wednesday week — no test fee at all. Or take it away, have the disc done elsewhere, and bring it back to the same station inside that same ten working day window for a partial retest costing no more than half the full fee.

What you must not do is have the disc replaced, drive the car for a fortnight, and then return. That is a full test at the full fee, with everything inspected again from scratch.

The retest and your certificate expiry

A retest does not extend your existing certificate, and the fee window has nothing to do with your expiry date. They are two independent clocks and they frequently run out of step.

If your previous certificate is still valid, you have breathing room: the car remains legal to drive while you arrange repairs, provided no dangerous defect was recorded, and the ten working day window is the only pressure. If the certificate has already expired, the car is off the road immediately and can only be moved to a pre-booked test or a pre-arranged repair appointment.

When the vehicle finally passes, the new certificate runs from the pass date under the normal rules — twelve months less a day, unless the pass fell within the month before the old expiry date, in which case the original anniversary is preserved. A car that fails in the final week before expiry and takes three weeks to repair therefore loses its anniversary and shifts its renewal date permanently. That is a strong argument for testing at the beginning of your window rather than the end.

What the fee rules do not cover

Everything above concerns the statutory test fee. Nothing in the MOT scheme caps or governs the cost of the repairs themselves, and the two are routinely conflated.

A garage may charge whatever it likes for parts and labour. It may charge for diagnosis. It may charge for storage if a vehicle is left with it for an extended period, though that should be agreed rather than assumed. What it may not do is charge more than the statutory maximum for the test, charge for a retest that the rules make free, or exceed the half-fee cap on a qualifying partial retest.

One other capped figure is worth knowing: a duplicate MOT certificate costs no more than £10. You rarely need one, since the result is on the online record and the record is what enforcement and insurers rely on, but the paper copy still exists if you want it.

What a retest actually involves

A partial retest is not a fresh MOT. The tester re-examines the items recorded as failures, together with anything disturbed during the repair or capable of having been affected by it. Replacing a front spring, for example, will bring the geometry, the suspension components around it and possibly the headlamp aim back into scope.

A full retest is a complete new inspection. Everything is checked again from the start, which introduces a risk worth understanding: an item that scraped through as an advisory three weeks ago can be graded a major defect this time. Brake efficiency, tyre tread on a car still being driven, and a windscreen chip that has spread are all realistic candidates. If the vehicle is marginal in several areas, getting back inside the partial retest window is worth real money.

For what the tester is looking at in each area, and how the four defect grades are applied, see our guide to what is checked on an MOT.

Planning repairs around the rules

A few practical decisions follow from all of this.

Decide quickly. The most expensive mistake is drifting past day ten while getting quotes. Establish on the day of the failure whether you are repairing at the station, elsewhere, or yourself.

If the failure is only on listed items, aim for the next working day. A blown bulb, a torn wiper blade or an illegible number plate can usually be dealt with the same evening for a few pounds. Returning the following morning costs nothing.

If the failure involves brakes, emissions, suspension or corrosion, forget the next-day route and work to the ten working day deadline instead. Book the retest slot at the same time as you book the repair.

Do not present a half-finished car. With only one partial retest available, a second failure is expensive. If a garage tells you a repair is a temporary fix, believe them.

Check the fee before the retest, not after. Ask whether the station intends to charge a partial retest fee and how much. It is capped, but it is not automatically nil, and a five-second question avoids an argument at the counter.

Get the window date in writing. Ask the station to tell you the last date on which a partial retest is possible, and put it in your calendar. Counting working days across a bank holiday is exactly the kind of small arithmetic that costs £54.85.

Keep the paperwork. The refusal notice lists the precise defect wording, which is what the retest will be assessed against. If you are having the work done elsewhere, hand a copy to the repairing garage rather than describing the fault from memory — the wording tells a mechanic which specific test the vehicle failed and to what standard the repair has to be made.

Getting ahead of the next one

The retest rules are a safety net, not a plan. The cheaper approach is to reduce the chance of failing in the first place: check the bulbs, tread, washer fluid, wipers and warning lamps before you go, and read last year's advisories, which are the tester's own prediction of what will fail next.

It also helps to test at the right point in the year. Booking inside the month before your certificate expires preserves your renewal date and leaves you legally on the road while repairs are arranged — which means the ten working day window and your certificate expiry are not fighting each other. You can confirm your current expiry date from the registration alone using the MOT check tool, and if a defect description on your failure notice is unclear, the MOT defect library explains what the common ones mean and what tends to be involved in putting them right.