What NCT and mileage do to what a dealer will pay
Of everything about your car you cannot change on the morning you sell it, these two move the number most. They are also the two that Irish sellers most often get wrong — usually by leaving the NCT until it is nearly gone, and by assuming a British mileage rule of thumb applies here.
The NCT, in the order it matters
The rule. A car is first tested at four years old, then every two years, and every year once it passes ten. Miss it and the car is not legally on the road, which means a buyer cannot drive it away and a dealer cannot put it on the forecourt.
What it is worth. A car sold with a long, clean NCT is straightforwardly worth more than the same car with two months left, and considerably more than one that has none. The gap is not sentimental — it is the cost and the risk the next owner is taking on:
| NCT position when you sell | What a dealer sees |
|---|---|
| Fresh full test, most of two years to run | Nothing to do. Best case. |
| Six to twelve months left | Fine, but the clock is somebody's problem soon |
| Under three months | They must test it before retail, and they price that in |
| Expired | An unknown bill, plus a booking wait — priced hard |
| Failed, retest not done | Treated as the worst case until proven otherwise |
The bit that catches people. Booking. Test slots are not always available when you want them, and a car that needs a test before it can be sold is a car sitting in a yard doing nothing. Time in stock is a cost to a dealer, so a booking wait comes out of your offer whether or not anybody says so.
A fail is not a disaster — hiding it is. About half of all cars fail first time, and the commonest reason across 7.1 million Irish tests is a blown bulb — our free NCT checklist will tell you what your own make and model tends to fail on. If it failed on a tyre and a bulb, say so. Every dealer has fixed those. What damages an offer is a dealer discovering something you knew about after they have committed to a number, because the next number will be lower and it will be lower on everything.
Advisories count too. Items marked as passing but worn tell the dealer what the car needs in six months. They read those.
Mileage, the Irish way round
We count in kilometres. Irish-registered cars read in km; cars imported from Britain read in miles. Mixing them up is the single most common mistake in a private ad, and it works out at a factor of 1.6 — enough to make a perfectly ordinary car look either impossibly fresh or hopelessly worn.
The yardstick. Around 17,000 km a year is the average most of the trade works to. Multiply your car's age by that and you have the figure a dealer expects before they look.
| Against the expected figure | Effect on the offer |
|---|---|
| Well under — say 10,000 km a year | Helps, but only with a history to back it up |
| About right | No effect at all. This is the baseline. |
| 30–50% over | A real deduction, bigger on premium and performance cars |
| Over 250,000 km | Changes what the car is: age stops mattering, condition is everything |
Very low mileage is not automatically good. A ten-year-old car with 40,000 km on it has spent most of its life not being driven, and cars do not like that — perished seals, seized calipers, tyres that are legal and eight years old. A dealer will value it well, but they will look at it harder, not less hard.
Round numbers are cliff edges. 100,000 km, 150,000 km, 200,000 km. Nobody defends this as logic, but buyers search under those numbers and the trade prices to it. A car at 148,000 km is worth more than the same car at 152,000, and the difference is larger than four thousand kilometres of wear could ever justify. If you are close to one, that is a reason to move now rather than after the summer.
Clocking is checkable here, and it is checked. Every NCT records the odometer reading, so there is a dated trail on the car, and history checks read it. A reading that goes backwards or a suspicious flat spell ends the conversation. If your car has a genuine explanation — a replaced cluster, an imported history — have the paperwork ready, because without it the car is priced as if it were clocked.
What is actually worth doing before you sell
Cheap things that pay:
- Test it if it is due within about three months. You are converting an unknown bill into a known one, and the known one is nearly always smaller than the deduction. Go through the pre-NCT checklist first — an evening in the driveway is cheaper than a retest and a second morning off work.
- Fix the fail items, not the advisories. Bulbs, tyres, wipers. Do not spend money on a timing belt to sell a car — you will not get it back.
- Find every service record and the last two NCT certs. A folder is worth more than a valet.
- Photograph the odometer. It ends the mileage conversation before it starts.
Not worth doing:
- A full professional detail on a car worth under about €6,000. Clean it yourself, properly.
- Bodywork. A dealer does theirs at trade rates and yours at retail; they will only pay trade.
- Anything that hides something. It gets found.
Get the actual number
Averages tell you the shape of it. What your own car is worth, with its own NCT date and its own reading on the clock, is a question only a dealer looking at it can answer.
Send the make, model, mileage and a few photos and Irish dealers come back with what they would really give you — free, no obligation, usually inside 24 to 72 hours.
For the rest of what they are weighing up, see what a dealer is actually looking at. If you are still deciding how to sell at all, start with trade-in versus private sale.