What Your Number Plate Tells You, and the Rules for Displaying It

Written by the MOT Check Now editorial team and checked against GOV.UK and DVSA guidance. Last updated 3 November 2026. Read our editorial policy and how we get our data.

A UK number plate is more than an ID tag. For cars registered since September 2001 it carries a coded clue to where and roughly when the vehicle was first registered, and the law is specific about how it must look. It also feeds straight into your MOT, because the first test falls due by the third anniversary of registration. This guide decodes the format, sets out the display rules and explains how personalised plates change the picture. MOT Check Now is independent and not affiliated with DVLA, so always confirm anything important on GOV.UK.

Key facts at a glance

How the current plate format works

Plates issued since 1 September 2001 follow a fixed pattern of seven characters in three parts, for example AB26 CDE.

• Two letters (the memory tag) show the region where the vehicle was first registered. They never use I, Q or Z as the memory tag.
• Two digits (the age identifier) show when the number was issued.
• Three random letters follow after a space.

The age identifier changes twice a year, in March and September. From March to August it is the last two digits of the year, so 26 covers March to August 2026. From September to February it is those digits plus 50, so 76 covers September 2026 to February 2027. A 74 plate therefore means September 2024 to February 2025. Plates from before September 2001 used older styles that this page does not decode.

Reading a plate step by step

1. Split it into three parts. Take AB26 CDE as an example: AB, then 26, then CDE.
2. Look at the two digits. If they are below 50, the number was issued from March to August of the year with those last two digits. If they are 50 or above, subtract 50 to get the year, and the number was issued from September of that year to the end of February the next year.
3. Treat the first two letters as a regional clue. They show the region of first registration, which is useful context but not a statement about where the car lives now.
4. Ignore the last three letters for dating. They are random and do not carry meaning for age.
5. Cross-check against the record. Compare your reading with the year of manufacture and month of first registration shown in the vehicle check.

Age identifiers year by year

The table below follows the rule above and gives the identifier and its period for recent years. It is derived from the GOV.UK rule and is a quick lookup, not a replacement for the vehicle record.

Older plate styles

Before September 2001, UK plates followed other formats, and some very old vehicles carry dateless styles. We do not decode them here, because the rules are different and an incorrect decoding is worse than none. If you have an older style plate and want to know the vehicle’s age, rely on the official vehicle record, the V5C log book, and tools such as the historical MOT check for older vehicles, and compare with the manufacture year in the vehicle details. For vehicles built many years ago, the question of whether they need an MOT is covered by MOT exempt vehicles.

What the plate does not prove

The age identifier shows when a number was issued, not always how old the vehicle is. Numbers belong to the Secretary of State and stay with the vehicle unless they are removed and placed on another vehicle or held on a retention certificate. A car can therefore wear a number that tells you less about its true age than you might assume. The right place for the facts is the official record: the MOT check and vehicle check show make, colour, fuel type, year of manufacture and the month of first registration from DVLA data, so you can compare what the plate implies with what the record says.

That comparison is one of the most useful habits for a used-car buyer. If the plate suggests a 2019 car and the record shows a 2012 manufacture year, there may be an innocent explanation, such as a transferred private number, but it should be explained. Equally, a plate that does not match the make, colour or fuel type on the record is a reason to stop and ask questions. Our used car checklist includes this kind of document check, and the free mileage check adds a second line of evidence by analysing recorded MOT odometer readings.

Why a plate can mislead

• Transferred numbers. A private number can be moved from one vehicle to another, so a “young” plate can be on an older vehicle. The rules say a number cannot make a vehicle look newer than it is, but the plate can still be younger than the car’s first-use date in some cases, so check the record.
• Imported vehicles. A vehicle first registered abroad can be registered in the UK years after it was built, so the UK age identifier reflects the UK registration, not the build date.
• Regional memory tags. The tag shows the region of first registration, not where the car has been used since.
• Misreading. Letters and digits can be mistaken, particularly with spaced or stylised characters, which is one reason the law sets spacing and font rules.

Legal rules for displaying a plate

GOV.UK sets out what a legal plate looks like, and the main points are straightforward:

• Plates must be made of reflective material, with black characters on a white background at the front and black on yellow at the rear.
• There must be no background pattern, and characters must not be removable or reflective.
• Plates fitted after 1 September 2021 must be marked BS AU 145e, use a single shade of black and show who supplied them.
• Raised 3D characters are allowed, and zero-emission vehicles may show a green flash.
• Motorcycles and tricycles registered on or after 1 September 2001 display a plate at the rear only, on two lines.

For a standard plate, the official guidance specifies characters 79mm tall and 50mm wide (except 1 and I), with set gaps between characters and a larger gap between the age identifier and the random letters. You cannot rearrange or misrepresent characters to form words, or use fixings to alter how a letter or digit reads. Driving with incorrectly displayed plates can bring a fine of up to £1,000 and an MOT failure, and in some cases the number can be withdrawn.

A practical plate check

We deliberately do not describe border widths, flag symbols or other details that we have not verified. Where the official rules are specific, use GOV.UK; where you are unsure, ask the plate supplier, who should show on the plate that they supplied it.

Buying plates

Plates fitted after 1 September 2021 must show who supplied them, and they must be marked BS AU 145e. That makes the supplier traceable and should help you spot a non-compliant plate. When you buy a plate, ask whether it meets the current standard, check the markings on the finished plate before it is fitted, and do not accept a plate with a pattern, a cut-off corner or characters that have been altered. You will need to provide evidence of your right to the vehicle and the number when you order, as is standard for a supplier. Check the current GOV.UK guidance on who can supply plates and what documents are needed, because requirements can change.

Show plates and novelty plates

Plates that follow the legal format but are used for display only, or that deliberately alter the look of the characters, are a common source of trouble. The rule of thumb is simple: if a plate is on a vehicle used on the road, it must follow the official rules. Rearranging characters to spell something, using fixings to change a letter or digit, or adding a pattern can result in a fine of up to £1,000, an MOT failure and, in some cases, withdrawal of the number. If you want a plate for display, be clear that it is not for road use.

Plates and the MOT test

A damaged, dirty, missing or illegal plate is a straightforward cause of failure, so it is worth checking before the test. Our MOT failure reasons guide covers the full checklist. The plate also ties to timing. The first MOT is due by the third anniversary of registration, then every 12 months, and the first MOT guide explains the date in detail. You can test up to one month minus a day before expiry and keep your renewal date, as explained in how early you can get an MOT. Do not rely on the age identifier to work out your date. Use the expiry shown in the MOT check, or set an alert with the MOT reminder.

The plate in your pre-test check

Before the test, look at both plates in daylight. Wipe off dirt and check for cracks, fading and peeling. Make sure each character is clear and that nothing, such as a bike rack or tow bar, hides the plate. Check the plate is firmly attached and that the lamp that lights the rear plate works. Our preparing for an MOT guide and MOT test checklist include the plate among the items you can fix cheaply, and the defect categories guide explains how a defect is classified if one is found. A plate fault caught before the test saves a retest. If you have a new plate fitted shortly before the test, keep the supplier’s receipt, because it shows the plate was properly supplied.

Private and personalised plates

A private number is one you choose or buy, bought from DVLA or from a private dealer. There are three steps in its life. Assigning puts a number you have the right to use onto a vehicle. Retaining takes it off a vehicle and keeps it, and you receive a V778 retention document that proves your right to use it. Transferring is retaining it and then assigning it to another vehicle. If you hold a number unassigned, you must renew your right to use it every 10 years.

GOV.UK sets conditions for the vehicle. It must be registered with DVLA in the UK, able to move under its own power, of a type that needs an MOT, and taxed or under SORN continuously for the past 5 years. If it has been under SORN for more than 5 years it must be taxed and have an MOT. Classic vehicles need a current MOT even if they are normally exempt. Numbers starting with Q or QNI cannot be kept. See SORN check and car tax check for the status of any vehicle.

Assign, retain, transfer: what each means

The costs above are the ones we have verified. Any other charges, such as vehicle tax if you tax the vehicle at the same time, are separate. We do not quote the price of buying a plate from DVLA or a dealer, because it varies with the number.

The DVLA transfer process and the age rule

You can apply online or by post. Taking a number off a vehicle costs £80 according to GOV.UK, while assigning a number to a vehicle is free. Online, the change is immediate if no inspection is needed. Fit the correct plates before you drive, tell your insurer and update any charging-zone payment accounts; the ULEZ checker shows how emissions rules apply to the vehicle itself.

One rule matters to anyone shopping for a used car: a private number cannot make a vehicle look newer than it is. An 07 number on a 2003 vehicle would not be allowed. Do not sell or scrap the vehicle until you have the new V5C and any V778, or you can lose the number. When you buy a car with a personalised plate, confirm its real age through the mileage check and MOT history rather than the plate.

Steps for a transfer

1. Check the number and the vehicles are eligible. Both the donor vehicle and the receiving vehicle must meet the DVLA conditions.
2. Check the tax and SORN history. The vehicle must have been taxed or under SORN continuously for the past 5 years, so look at the SORN check and car tax check.
3. Apply to DVLA. Online or by post. Retaining costs £80, and assigning is free.
4. Wait for confirmation and documents. Do not sell or scrap the vehicle until you hold the new V5C and any V778.
5. Fit legal plates. Use a supplier who marks the plates BS AU 145e and shows their name.
6. Tell your insurer and update accounts. The registration changes, so anything tied to it must follow.

When the number cannot go on a vehicle

The number cannot make the vehicle look newer than it is. Numbers starting with Q or QNI cannot be kept. The vehicle must be registered with DVLA in the UK, able to move under its own power, and of a type that needs an MOT. If a vehicle has been under SORN for more than 5 years, it must be taxed and have an MOT before a transfer. Classic vehicles that are normally exempt need a current MOT for the transfer to proceed. If any of these conditions fail, the application can be refused, so check before you pay for a number you plan to use.

Worked examples

These illustrative examples show how the rules work. The registrations are made up for teaching purposes.

Example 1: decoding a plate

A plate reads AB24 XYZ. The age identifier is 24, which is below 50, so the number was issued between March and August 2024. The memory tag AB points to a region of first registration. XYZ is random. If the vehicle record shows a first registration in May 2024, the plate and the record agree.

Example 2: a September plate

A plate reads CD74 EFG. The age identifier is 74, which is 50 or above, so subtract 50 to get 24. The number was issued from September 2024 to February 2025. A car registered in November 2024 would be expected to show 74.

Example 3: a plate that does not match

A buyer sees a car advertised as a recent model with a plate suggesting 2023, but the vehicle check shows a manufacture year several years earlier. A private number could explain it, but the rules say the number cannot make the vehicle look newer than it is. The buyer asks the seller for the V5C and any V778, and looks at the MOT history for the first test date. If the explanations do not add up, they walk away.

Example 4: a failed plate at the MOT

A car with a cracked rear plate and a bike rack that hides part of the registration arrives for a test. The plate is not clear and fully visible, which is a reason for a defect. The owner fits a compliant plate marked BS AU 145e, moves the bike rack and returns for a retest. The cost of a new plate is small compared with the full retest fee, so checking the plate beforehand would have saved both money and time.

Plates and vehicle checks

The plate is the key you use to look up a vehicle. When you type it into the MOT check, vehicle check or car tax check, we send it to official sources to fetch the vehicle record. The record shows the make, colour, fuel type, engine size, year of manufacture and tax and MOT details from DVLA and DVSA data. It does not show who owns or keeps the vehicle. If the colour, make or fuel type on screen does not match the vehicle in front of you, stop and ask the seller why. That mismatch is a standard sign to check the paperwork, and it is the reason experienced buyers always look up the plate before viewing. Read more in how we get our data and our privacy policy.

What our tools show and what they cannot

Our free tools show MOT status, expiry date, days remaining, full MOT history with advisories and failures, mileage analysis, tax and SORN status, vehicle details, and ULEZ and clean air zone estimates based on Euro status and fuel type. They cannot tell you who the keeper is, whether a private number was transferred, or whether a plate is physically legal. A full vehicle report brings the MOT timeline, mileage analysis and a risk summary into a PDF, but it does not include finance, stolen or write-off data. Those are not available from the free official sources we use. For emissions zones, see the ULEZ checker, the clean air zone checker and the congestion charge check, and always confirm with the official operator before you travel.

Checking a plate against the car in front of you

When you view a used car, make the plate part of your routine. Read the registration from the plate itself, not only from the advert, and enter it exactly. Then compare what the record says with what you can see: make, model, colour, fuel type and approximate age. The DVLA fields we can show include make, colour, fuel type, engine capacity, year of manufacture, month of first registration, tax status and MOT status, so there is plenty to compare. Look at the V5C as well. The registration, make, colour and chassis details should match the car, and the document should look genuine and consistent. If you are told the V5C is “on its way”, be cautious, because without it you have no proof the seller is the registered keeper and, for a transferred private number, no proof of the paperwork behind it.

A mismatch does not prove wrongdoing. Cars are repainted, engines are changed and records can be wrong. But a mismatch is a reason to slow down. Ask for an explanation in writing, check the MOT history for earlier colour or fuel type entries, and use the guide to reading MOT history to interpret what you find. If the answers are vague, the safest action is to walk away. Our seller claim checker can also help you compare what a seller says about a car with what the official records show.

If your plate is damaged, lost or stolen

A damaged plate should be replaced promptly, because a plate that is cracked, faded or unreadable can lead to an MOT failure and a fine of up to £1,000 if it is incorrectly displayed. Replacement plates must follow the current standard, so choose a supplier who marks the plate BS AU 145e and shows their name. If a plate is lost or stolen, report it to the police as advised on GOV.UK and arrange replacements, because a stolen plate can be misused. Keep a record of the registration and the vehicle details in case you need to prove it is yours. We do not hold or manage any of this, so rely on GOV.UK and the police for the current procedure.

Common mistakes with number plates

• Treating the age identifier as the car’s exact age. It shows when the number was issued.
• Using the plate to work out the MOT date. The date comes from the registration anniversary and the last pass, so use the MOT check.
• Buying cheap plates without the standard mark. Plates fitted after 1 September 2021 need BS AU 145e and the supplier named.
• Altering characters. Rearranging, spacing or using fixings to change how a character reads is not allowed.
• Selling or scrapping before the paperwork arrives. You can lose a private number if you do not hold the new V5C and any V778.
• Forgetting to renew an unassigned number. The right to use it must be renewed every 10 years.
• Not checking SORN history. A vehicle must have been taxed or under SORN continuously for 5 years to take a transfer.
• Ignoring a dirty or obscured plate. It can lead to an MOT failure and a fine of up to £1,000.

Glossary

Age identifier

The two digits on a post-2001 plate showing when the number was issued.

Memory tag

The first two letters of a post-2001 plate, showing the region of first registration.

V5C

The vehicle registration certificate, commonly called the log book.

V778

The retention document that proves your right to use a private number you have taken off a vehicle.

Assign

To put a number you have the right to use onto a vehicle.

Retain

To take a number off a vehicle and keep it.

BS AU 145e

The British Standard marking required on number plates fitted after 1 September 2021.

Green flash

A marker on the plate that zero-emission vehicles may display.

SORN

Statutory Off Road Notification, which tells DVLA a vehicle is being kept off the road.

Sources and further reading

• GOV.UK, “Vehicle registration” and the number plate pages, for the format, display rules, size and standard BS AU 145e.
• GOV.UK, the private number plates pages, for assigning, retaining and transferring numbers and the associated costs and conditions.
• GOV.UK, “Getting an MOT”, for the first test and renewal timing.
• GOV.UK, “Make a SORN”, for off-road declarations.
• DVLA, the Vehicle Enquiry Service documentation, for the vehicle fields we can show.
• Contains public sector information licensed under the Open Government Licence v3.0.

More guides are in our guides library, and you can read how we handle sources in our editorial policy.