Why March and September Are the Cheapest (and Priciest) Months to Buy a Car in 2026
UK number plates change twice a year, in March and September, driving both a rush of new registrations and a dip in demand for outgoing-plate used cars. How to use the timing to your advantage.
A purely cosmetic detail with a real financial effect
The plate change itself changes nothing about a car mechanically β it is simply an age identifier used for registration and identification purposes. But because many buyers place real value on having the newest-looking plate, demand (and therefore price) for both new and used cars shifts noticeably around each change date, creating a genuine, predictable seasonal pattern in the market.
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| Buyer goal | Best timing | Why |
|---|---|---|
| Cheapest used car, don't mind an older-looking plate | Just after a plate change (March/September) | Demand and value for the just-superseded plate dip immediately |
| Best new-car discount, don't need the very newest plate | Weeks just before a plate change | Dealers often discount outgoing-plate stock to clear it |
| Newest-possible plate, willing to pay for it | Just after the change | Highest demand period, least room to negotiate |
Why sellers of outgoing-plate cars become more flexible
The moment a new plate becomes available, a used car carrying the just-superseded one instantly looks "older" to buyers who care about plate age, even though nothing about the car itself has changed. Private sellers and dealers holding this stock often become noticeably more willing to negotiate in the days and weeks immediately following a change, simply to move stock that buyers now perceive as slightly less desirable.
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For buyers who genuinely don't care about the cosmetic plate age β and functionally, there's no reason to, since it has no bearing on reliability, safety or performance β timing a purchase just after a plate change date is one of the simplest, lowest-effort ways to negotiate a better price on an otherwise identical car.
Sources
- DVLA: Vehicle registration number plates
- Society of Motor Manufacturers and Traders (SMMT): New car registration data
Frequently asked questions
Why do UK number plates change in March and September?
The age identifier in a UK number plate changes twice a year, on 1 March and 1 September, so a new plate is issued to cars first registered from that date β this drives a strong seasonal spike in new car sales just before and after each change date, as buyers want the newest-looking plate.
Is it cheaper to buy a used car just before or just after a plate change?
Just after a plate change is often better for buying a used car with the outgoing plate, since demand and resale value for that specific plate age typically dip the moment a newer one becomes available β sellers of outgoing-plate cars may be more willing to negotiate at that point.
Is it worth waiting to buy a new car until just after the plate change?
For a new car, buying just before the change (on the older plate) can sometimes mean better dealer discounts as they clear stock ahead of the new plate's arrival, while buying just after gets you the newest plate but often at a less negotiable price during the initial demand spike.
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