What a dealer is actually looking at when they value your trade-in

From the customer's side of the desk it looks like a guess. Someone walks around the car, looks at the reg on a screen, and a number appears.

It is not a guess, and knowing what is behind it is the difference between accepting a figure and understanding it. Here is the sum, roughly in the order a dealer does it.

They start at the end, not the beginning

The first question is never "what is this car worth". It is "what will this car retail for, and how long will it take?"

So they look up what the same car — same year and half-year plate, roughly the same mileage, same spec — is advertised at right now, and more importantly what has actually been selling. Advertised prices are asking prices. The trade knows the difference.

That retail figure is the top of the sum. Everything after this comes off it.

Then they take out the work

Almost nothing goes on a forecourt in the state it arrived in. Off the retail figure comes:

Anything mechanical it needs. Brakes, tyres, a service, a timing belt if it is due.
Bodywork and wheels. Bumper scuffs, kerbed alloys, a dent in a door. All at trade rates, but not at nothing.
A proper valet. More than a wash — an hour or three of somebody's day, inside and out.
The NCT, if it is short or gone. Plus the wait for a test slot, which is time the car cannot be sold. See what NCT and mileage do to what a dealer will pay, and the free NCT checklist if you are testing it yourself before you sell.
Photography and advertising. Every car on a forecourt costs money to put in front of people, every month it sits there.

Then the risks

This is the part customers rarely see, and it is where the honest gap comes from.

Days to sell. A car that will be gone in a fortnight is worth more to a dealer than one that will sit until spring, because stock costs money to hold — funded, insured, taxed and occupying space that another car could be using.
Warranty. They are selling to a consumer, which means real obligations if something goes wrong. A car with a history they cannot see is a car that might come back.
The unknowns. A patchy service record, a warning light nobody mentioned, an import with a life before Ireland that cannot be traced. Each one widens the margin they need.
Whether they even want it. A dealer who sells family diesels does not want your convertible and will price it as something to move on to another trader. It is not a comment on the car.

And then the margin — which is smaller than you think

What is left after all of the above is the offer, minus the profit the business runs on. On an ordinary used car in Ireland that margin is thinner than most people assume, and it is taxed: when a dealer buys from a private seller they normally resell under the VAT margin scheme, paying VAT on the profit rather than the full price. Which is precisely why they can afford to give you a fair number in the first place.

What actually moves your figure

In order:

Demand for that exact car, this month. Nothing else comes close. Fuel type, size and body shape swing harder and faster than condition ever does.
Mileage against the roughly 17,000 km a year the trade expects, and whether you are near a round number.
NCT position — a long clean test, or a bill and a booking wait.
History and paperwork. Service records, one owner, no gaps. The cheapest value you own.
How it presents. A clean car photographs better and sells faster, and faster is worth money.
The plate. Which half of the year it was registered in — 231 versus 232 is a real gap.

How to get the best number out of the process

Be first to mention every fault. A dealer who finds a problem after quoting drops the price on the whole car. A dealer told up front prices it once and stands over it.
Bring the folder. Service history, both keys, the NCT certs, the manual. Two keys alone is worth having, because a replacement is not cheap.
Clean it properly and empty it. Not to fool anybody — a clean car is genuinely easier to assess, and an assessor who is comfortable is not padding the number for safety.
Get more than one offer. Different dealers want different cars in different weeks. The spread between two honest offers on the same car is often several hundred euro and sometimes more.
Separate the two numbers. If you are trading in against another car, ask what they will give you for yours and what they will do on theirs, as two questions. It tells you where the room actually is.

The easy way to get several offers at once

That last point is the whole reason this site exists. Ringing round five yards is a day's work; sending your car to them at once is ten minutes.

Tell us what you drive, the mileage and a few photos and dealers around Ireland come back with what they would really pay — free, no obligation, usually inside 24 to 72 hours. Only the dealer whose offer you accept ever gets your name or your number.

And if you are still weighing that against advertising it yourself, the arithmetic is on trade-in versus private sale.