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In the UK, your car needs an MOT test once a year once it's three years old. Unless it's a taxi, which requires an MOT test every three years from the date of registration.
You can check the exact date your car's MOT is due on the GOV.UK website.
It's important to keep your MOT up to date, not only to avoid fines, but also to ensure your car is safe to drive.
If you are found to be driving a car without a valid and up-to-date MOT certificate you can be fined up to £1,000. On top of this, if your car is deemed unsafe to drive, it could be impounded.
If you're unsure about anything relating to your MOT, you can contact a local MOT centre or garage for advice.