The seller gets an automatic refund for every whole month left on their tax, which is why they rarely mention it. Their refund and your liability start on the same day, and driving the car home in that gap is an offence whether or not you knew about it. It takes about two minutes to fix, and you can do it on your phone standing next to the car, provided you have the right piece of the V5C in your hand.
Why is a car you've just bought untaxed?
Since 2014, road tax has been tied to the keeper, not the car. When the seller notifies DVLA of the sale, their tax is cancelled automatically and any full months left are refunded to them. Nothing carries over to you. There's no grace period, no "few days to sort it": the car is untaxed from the moment of sale, and the responsibility is entirely yours.
This trips people up because the tax disc is long gone and there's nothing in the window to remind you. The car looks taxed. It isn't.
How do you tax a car you've just bought?
Tax it online or by phone with the 12-digit reference on the green new keeper slip (V5C/2), which the seller tears from the bottom of the logbook and hands you. That's all you need:
- Go to the "Tax your vehicle" service on gov.uk (or phone DVLA's 24-hour line).
- Enter the 12-digit reference from the new keeper slip.
- Choose to pay by card, monthly Direct Debit or annually, and confirm.
It's live immediately: you can tax the car on your phone standing next to it and drive off legally straight away. Do it before you set off, not when you get home.
What do you need before you can tax a car?
DVLA will only let you tax a car with a valid MOT (if it's old enough to need one), and you must have insurance in place before you drive it. Sort the insurance first (you can arrange cover the same day, often to start immediately), then tax, then drive. A car that needs an MOT and doesn't have one can't be taxed at all, which is one more reason to check the MOT status before you buy.
What if you don't have the new keeper slip?
If the seller didn't give you the green slip, or you've lost it, you're into paperwork: either wait for your own V5C to arrive (5 to 7 working days if the seller notified DVLA online, longer if they posted it), or apply for a replacement logbook with a V62 form and a £25 fee at a Post Office that deals with vehicle tax, where you can tax the car at the same time. Until one of those happens the car is stuck: untaxed, undriveable. This is exactly why you should never hand over money for a car without getting that slip in return. If the seller "can't find the logbook", treat it as the warning sign it usually is, not a minor inconvenience.
How much will the car tax cost?
The cost depends on when the car was first registered, which decides whether its CO₂ figure, its engine size or a flat standard rate sets the price. A thirsty car from 2001 to 2017 can cost several hundred pounds a year. It's worth knowing the figure before you buy, because tax is a real slice of the running cost. Our car tax calculator works it out in seconds, and a full history report shows the exact band for the specific car along with everything else on its record.
In what order should you buy, insure and tax a car?
Agree the deal, watch the seller notify DVLA of the sale online and take the green slip, arrange insurance, tax the car with the slip's reference, and only then drive away. Five minutes of admin that keeps you legal from the first mile and starts the seller's refund cleanly. Skip it and the first speed camera or ANPR gantry you pass has you driving an untaxed car.
