The best time to buy a used car: what the calendar really changes, and what it does not

The short answer

The calendar changes three things for a used-car buyer that can be checked: how much stock comes to market and when, when the car's next MOT falls, and the fact that tax starts from the day you buy, whatever was showing before. It also changes demand in ways the trade talks about constantly, convertibles in winter, four-wheel drives in summer, quiet showrooms in January, but we have no figures for those effects and we are not going to invent any. If a page gives you a month-by-month price table without saying where the numbers came from, treat it as opinion.

The practical answer is that the best time to buy is when the right car, with a history you have read, is in front of you at a price you have checked. The calendar can tilt the odds of that happening; it cannot replace the checks.

Plate-change months: more stock, not automatically lower prices

New registration plates change twice a year. The DVLA leaflet on registration numbers and number plates sets out the pattern: registrations from March to August carry the year's two digits, and registrations from September to February carry the year plus fifty. Because new cars cluster around those dates, the part-exchanges and the cars coming off three-year finance agreements cluster a few weeks after them. The same rhythm appears in the MOT data: GOV.UK requires a first MOT by the third anniversary of registration, so the three-year-olds that reach their first test in March and September are the same cars arriving on forecourts. Our piece on pass rates by month shows how much the mix of cars tested changes with the plate months.

More stock means more choice and more sellers competing for your attention. Whether it means a lower price for the particular car you want depends on demand for that car, and nobody publishes that by the month in a form you can verify. Use the plate months for choice, and negotiate on the car, not the calendar.

The MOT due date is a real saving you can see

An MOT lasts for a year. A car bought the week after a pass has nearly a year before the next test; a car bought with a month left has a test coming that may find the wear items a seller did not mention. The DVLA vehicle enquiry shows the MOT expiry date for any registration before you travel, and the MOT history shows what the last test found and advised. A fresh pass with no advisories is worth more than a fresh pass with a list, and a long list with a month to run is a negotiating point or a reason to walk.

Tax starts from the day you buy

Whatever tax the seller had, you do not inherit it. When a sale is recorded DVLA cancels the seller's tax and refunds them the full months left, and GOV.UK's buyer guidance says you need to tax the vehicle before you can use it on the road. So the day of the month you buy makes no difference to the seller's tax and every difference to yours: tax it with the green new keeper slip before you drive off, and insure it first.

The seasonal effects the trade talks about

Convertibles and sports cars are said to sell slowly in the dark months and fast in spring; four-wheel drives the other way round; showrooms are said to be quiet in the weeks after Christmas and busy before summer holidays; and salespeople are said to be more flexible at the end of a month or quarter. These are plausible, widely repeated, and unmeasured in any source we would quote. Treat them as reasons to look, not as discounts you are owed. If a seasonal car is advertised out of season, the question is still what its history says, not what month it is.

What to do whatever the month

1. Match the details first. GOV.UK's buyer page says to check the registration, make and model against the DVLA record before you view.
2. The history, in full. Every MOT test since 2005, with the mileage at each one; look for the advisory that came back and the mileage that stopped rising.
3. Recalls and the log book. Check for an outstanding safety recall on the GOV.UK recall checker, and check that the V5C is not for a stolen vehicle, using the serial number guidance on GOV.UK's buyer page.
4. The due dates. MOT expiry from the DVLA enquiry; tax from the day you buy.
5. Price against the car, not the month. A good car in a busy month beats a poor one in a quiet one.

What this does not mean

Nothing here says prices do not move with the season; they may well. It says that we have not seen a source that measures it in a way a buyer can check, so this page does not claim a saving for any month. The one calendar effect in our own data is the mix of cars reaching the test around the plate changes, and that is about stock, not price. This article is general information based on the GOV.UK pages read on 27 October 2026, not financial advice.

Sources and method

This article contains no MOT statistics and no price figures. The plate-change pattern is from DVLA's INF104 leaflet and the MOT and tax rules from the GOV.UK pages listed under Sources, as they read on 27 October 2026. The MOT reliance notice below applies to the MOT history check this article recommends.

• DVLA: Vehicle registration numbers and number plates (INF104)
• GOV.UK: Buying a vehicle
• GOV.UK: Getting an MOT
• GOV.UK: Get vehicle information from DVLA
• GOV.UK: Check the MOT history of a vehicle
• GOV.UK: Cancel your vehicle tax and get a refund

This article is general information drawn from published test records. It is not professional, mechanical or legal advice, and an MOT pass or a clean MOT history does not guarantee that a car is roadworthy today. If you are unsure about a car, have it inspected by a qualified mechanic. You can check any vehicle's MOT history free on the official GOV.UK MOT history service.