The MOT has run annually since 1967. The gap between a new car’s registration and its first test has been three years for roughly the same period. In 2023, the Department for Transport consulted on changing both. The consultation produced clear evidence, a considered response from the road safety sector, and — ultimately — no change to either number. The underlying questions, though, have not gone away.
The 2023 frequency consultation
The DfT’s 2023 consultation, Improving the MOT, proposed three specific changes: extending the interval before a vehicle’s first MOT from three years to four; allowing some vehicles to move to biennial testing (every two years) after passing their initial test; and removing the requirement for vehicles older than 40 years to be tested at all — the last of which was largely redundant given the rolling exemption already introduced in 2018.
The extension proposal rested on a reasonable-sounding premise. Modern cars are more reliable than the cars of 1967. Electronic stability control, improved metallurgy, better tyre compounds, and widespread use of self-diagnostic software mean that a three-year-old vehicle in 2023 is less likely to develop a safety-critical fault than a three-year-old vehicle in 1967. The argument was that the three-year threshold, set when the Leyland Marina was a new model, might be calibrated for a world that no longer exists.
The road safety sector disagreed, and it had numbers to support the position.
What the evidence said
The core counter-argument relied on DVSA’s own defect data. A 2017 DVSA research study — drawn on again during the 2023 consultation — found that extending the first MOT interval from three to four years would result in a measurable increase in vehicles with undetected defects on public roads.
The study estimated that extending the first test to four years would mean approximately 25 million additional dangerous or significant defects going undetected per year — figures that, when translated into accident probability, implied material increases in casualties. The Royal Society for the Prevention of Accidents (RoSPA) and Brake both submitted evidence opposing the extension on these grounds. The AA and RAC were similarly cautious.
The difficulty for the extension argument is that modern car reliability is not the same thing as modern driver maintenance behaviour. A car’s diagnostic systems can flag an engine fault. They cannot detect a tyre worn below the legal tread limit, a corroded brake line, or a headlight misaligned well enough to pass the driver’s attention but fail a test station’s beam-setter. These are the categories where MOT data consistently shows high defect rates — and they are not items that modern automotive electronics catches.
Lighting failures are the most common single defect category in DVSA’s test data, year after year. A bulb failure is not a sophisticated problem. It is not the kind of fault that improved engine management systems prevent. Extending the testing interval means more vehicles spend more months with unchecked tyres, lights, and brake condition — precisely the items that the MOT catches most frequently.
The government’s response to its own consultation was to announce it would not proceed with the frequency changes. The three-year first test and annual subsequent testing remain in place.
Where the interval debate stands now
The consultation has closed and the intervals are unchanged. But the underlying argument is structurally likely to return. Vehicle technology is advancing faster than the MOT inspection manual. Connected vehicles, ADAS systems, and improved telematics offer at least theoretical alternatives to the fixed annual inspection — real-time monitoring versus point-in-time testing.
None of this has translated into legislation or even a credible consultation proposal. The preconditions for any monitoring-based alternative — universal fitment, tamper-proof data access, a regulatory framework for acting on monitored data — are not currently in place for the general car fleet. For the time being, the annual test holds.
For historical context on how the current intervals were set, see A short history of the UK MOT test.
EV testing: where things currently stand
Battery-electric vehicles go through the standard Class 4 MOT alongside petrol and diesel cars. There is no separate EV test category, no general exemption, and no special scheduling. A Tesla Model 3 registered in 2022 will need its first MOT in 2025, the same as a equivalent-year Volkswagen Golf.
The practical differences are in how individual test items apply.
Emissions — there are none. A BEV has no exhaust, so the emissions section is marked not applicable and the tester moves on. No CO, no HC measurement, no smoke opacity test. This is straightforwardly simpler than testing a petrol or diesel.
Brakes — more complicated. Most modern BEVs rely primarily on regenerative braking, with friction brakes as a secondary system. The MOT brake efficiency test — carried out on a rolling road that measures retardation force at each wheel — assesses the friction brakes only. Regenerative braking produces no output the rolling road equipment can capture.
A BEV must achieve adequate friction brake efficiency on its own. In practice, the friction brakes on current BEVs are functional; they are simply used less frequently than on combustion vehicles, because regeneration handles the majority of deceleration in normal driving. This lighter use raises a maintenance concern: discs and pads used infrequently are more susceptible to surface corrosion. A BEV that has done most of its braking through regeneration may arrive at its first MOT with discs that look worse than a comparable combustion car’s, despite the car being perfectly safe.
The DVSA inspection manual has not been substantially updated to address regen-specific brake assessment. The guidance is relatively thin, and the testing methodology was designed for vehicles where friction braking does the primary work.
Battery condition — not tested. State of health, range degradation, and charging curve are entirely outside the MOT’s current scope. A BEV with a battery that retains only 60 percent of its original capacity will pass its MOT without any flag against that condition. Some testers and motoring organisations have called for a battery health check to be added; the DVSA has not yet moved in that direction.
The absence of battery testing is a live debate rather than a settled position. As the BEV fleet ages — the first generation of mass-market BEVs from 2013–2018 is now reaching the point where battery degradation is genuinely relevant — pressure to add some form of health check will increase. What that check looks like, who is qualified to carry it out, and what threshold constitutes a failure are all unanswered questions.
ADAS and the calibration question
Advanced Driver Assistance Systems — lane-keeping assist, autonomous emergency braking, adaptive cruise control, blind-spot monitoring — are now standard or common fitment on vehicles built since roughly 2018. These systems depend on correctly calibrated sensors: cameras, radar, lidar, and ultrasonic arrays positioned precisely relative to the vehicle’s geometry.
A minor collision, a windscreen replacement, or even a wheel-alignment correction can knock ADAS sensors out of calibration. An uncalibrated AEB system may not trigger at the correct distance. A misaligned lane-keep assist may apply steering corrections in the wrong direction. The safety implications of miscalibrated ADAS are potentially significant — and the MOT does not currently test for them.
The DVSA has acknowledged this gap. ADAS calibration is flagged in discussions about future MOT development, but it has not yet entered the inspection manual as a testable item. The barriers are partly technical — calibration verification requires specialist equipment not present in most test stations — and partly definitional: there is no agreed standard for what a pass-level calibration looks like across the broad range of ADAS systems fitted to current vehicles.
If ADAS testing is added to the MOT, it will require a significant investment in test station equipment and tester training. The precedent exists: the introduction of emissions testing in 1991 required new equipment across the testing network. The 2012 digitisation required a national database infrastructure. Each of these was a substantial undertaking. ADAS calibration testing would be at least as complex, and probably more so.
What actually is coming
The DVSA updates the inspection manual periodically without consulting on major structural changes. Specific items — revised DPF guidance, updated brake fluid thresholds, clarified definitions for certain defect categories — can change through this route without a formal consultation process.
The MOT fee cap is reviewed separately. The current maximum fee for a Class 4 car MOT — £54.85 as of the most recent revision — is set by government rather than left to market forces. Any change to the cap requires a statutory instrument rather than a consultation.
The headline structure: three years to the first test, annual testing thereafter, no EV exemption, no ADAS testing, no battery health check. That is where the MOT stands as of 2026, and it is where it is likely to remain for the near term, barring a change of political priority that the current evidence base does not obviously support.
See also: MOT exemptions for classics, EVs, and other corner cases.