The rule
The exemption rolls forward continuously: on any given date it covers vehicles built or first registered more than 40 years before. It is not automatic in the sense of being granted to you. The keeper claims it, on form V112, each time the vehicle is taxed.
Substantially changed
The exemption does not apply if the vehicle has been substantially changed in the previous 30 years. Changes to the chassis, body, axles or engine can all count. The judgement is the keeper's to make and to stand behind.
Exempt is not the same as roadworthy
The legal duty to keep a vehicle in a roadworthy condition applies whether or not it needs a test. Many owners of exempt vehicles still have a voluntary MOT for exactly that reason.
Check your own vehicle
See the MOT expiry date and full test history for any UK registration.
Sources
Related guides
- Can you tax a car without an MOT?
Why vehicle tax and the MOT are linked, and the situations where you can still tax a vehicle without a current test.
- When is my MOT due?
How to find your MOT expiry date, when the first test falls due, and how to be reminded before it runs out.