How much does a dealer actually make on a used car? If you ask a member of the public, they'll probably guess something ridiculous — "you lot make thousands on every car." If you ask a dealer, they'll laugh and show you a spreadsheet full of prep bills and advertising costs.
The truth, as always, is somewhere in the middle. And it varies wildly depending on the type of car, how you bought it, and how long it takes to sell.
This guide breaks down how used car profit margins actually work in the UK — the real numbers, the hidden costs, and a worked example you can apply to your own deals.
The Three Types of Margin
Not all margins are created equal. Before we get into the numbers, let's define the three ways dealers make money on used cars.
Retail Margin
This is the straightforward one: the difference between what you paid for a car and what you sell it for on the forecourt. Buy a car at auction for £14,000, sell it to a retail customer for £18,000 — your gross retail margin is £4,000.
But gross margin isn't profit. Not even close. We'll get to the deductions shortly.
Wholesale Margin
Sometimes a car doesn't suit your forecourt. Maybe it's not the right spec, maybe you've already got three of the same model, or maybe it needs too much work. In those cases, you sell it on to another dealer — wholesale.
Wholesale margins are thinner. You might buy a car for £8,000 and sell it trade for £9,200. That's a £1,200 gross margin, but with lower costs (no prep, no advertising, no warranty). Net profit might be £800-1,000. Not exciting, but it turns stock quickly and keeps cash flowing.
Part-Exchange Margin
This is often the most profitable route because you control both sides of the deal. A customer comes in to buy a car, and you take their old one as part of the payment. You value the part-exchange conservatively (because that's your job), then sell it at retail or trade.
The margin on part-exchanges is typically 20-40% higher than auction purchases because you're buying at below wholesale price. The customer accepts a lower value because they want the convenience of a one-stop deal. Everyone wins — they get a hassle-free swap, and you get better margin.
What Typical Margins Actually Look Like
Here's where we get into real numbers. These are based on conversations with independent dealers across the UK and what we see in the data — not hypothetical textbook figures.
Mainstream Cars (Focus, Golf, Corsa, Qashqai)
The bread and butter of most independents. Buy prices typically range from £5,000-£15,000.
- Gross margin: £1,500-£3,000 per car
- Net margin (after all costs): £800-£1,800 per car
- Turn time: 25-40 days average
These cars are your volume. They're not going to make you rich on any single deal, but they sell consistently and predictably. A dealer moving 15-20 mainstream cars per month at an average net of £1,200 is making £18,000-£24,000 per month before fixed overheads. Not bad.
Premium Cars (BMW 3/5 Series, Mercedes C/E Class, Audi A4/A6)
Higher buy prices (£15,000-£35,000), but the margins are bigger too.
- Gross margin: £2,500-£5,000 per car
- Net margin: £1,500-£3,500 per car
- Turn time: 30-50 days average
The catch with premium stock is that prep costs are higher (parts and labour cost more on a BMW than a Ford), and they tend to sit longer. A Mercedes E-Class with the wrong colour or spec can age on your forecourt while a sensibly-specced Focus sells in a week.
Prestige and Specialist (Porsche, Range Rover, AMG/M-Sport performance)
This is where margins get serious — but so do the risks.
- Gross margin: £5,000-£15,000+ per car
- Net margin: £3,000-£10,000+ per car
- Turn time: 45-90+ days average
These cars tie up a lot of capital. A Range Rover Sport bought for £40,000 with a potential net profit of £6,000 sounds great, but if it takes 75 days to sell, your cash is locked up for nearly three months. Opportunity cost matters. Could that £40,000 have bought three mainstream cars that collectively made £5,000 in a third of the time?
Margin per car is only half the story. Margin per pound invested per month is what actually determines how profitable your business is.
The Costs That Eat Your Margin
Here's where the public's idea of dealer profit meets reality. That £4,000 gross margin doesn't stay at £4,000 for long. Let's list everything that comes out of it.
Prep and Reconditioning
Every car needs work before it hits the forecourt. Even a 1-year-old car with delivery miles needs a valet, an inspection, and usually some minor cosmetic work.
- PDI and inspection: £100-200
- Valet and detail: £80-150
- Mechanical work: £0-2,000+ (huge range depending on condition)
- Cosmetic work: £0-500 (dent removal, touch-ups, wheel refurb)
- Tyres: £0-400 (if two or more are worn)
- MOT: £55 + any work needed to pass
Realistic total for a mainstream car in average condition: £500-800. For premium cars: £800-1,200. For older or high-mileage stock: £1,000-2,000+.
Delivery
Getting the car from the auction to your premises. Budget £150-300 depending on distance. If you collect yourself, factor in your time and fuel.
Advertising
AutoTrader is the primary advertising channel for most UK dealers. Depending on your AT package, the cost per car listed varies, but a reasonable estimate is £100-200 per car for the duration it's listed. If you also list on Motors.co.uk, eBay Motors, or other platforms, add another £50-100.
Warranty
If you offer a dealer warranty (and you should — it builds trust and is often expected), budget £100-300 per car depending on the cover level and provider.
Finance Commission (Credit Where It's Due)
If the buyer uses dealer finance, you'll earn a finance commission — typically £300-800 depending on the deal. This actually adds to your margin rather than subtracting from it. Finance penetration of 40-50% is typical for a well-run independent, so on average, finance contributes about £150-400 per car sold across your whole stock.
Finance commission is genuinely significant. A dealer selling 15 cars a month with 50% finance penetration at an average commission of £500 is making an extra £3,750 per month from finance alone. Don't overlook it.
Worked Example: A Real Deal Calculation
Let's walk through a real deal from start to finish. This is based on a composite of actual trades, with the numbers rounded for clarity.
The Car
2022 Volkswagen Golf 1.5 TSI Life, 28,000 miles, petrol, white, DSG automatic. Clean photos, full service history, 9 months MOT remaining. Listed on CarWow auction.
Step 1: Check the Value
AT retail valuation for this exact spec and mileage: £18,900. AT retail rating at that price: "Good" — meaning it should sell within 30-40 days.
Step 2: Assess the Buy Price
Current CarWow auction price (with 4 hours remaining): £14,200.
Step 3: Calculate Gross Margin
£18,900 - £14,200 = £4,700 gross margin.
That looks healthy. But now the deductions start.
Step 4: Deduct Costs
- Prep (PDI, valet, minor cosmetics): £450 — relatively new car, shouldn't need much
- Delivery from auction: £200
- New front tyres (advisory on last MOT): £200
- Advertising (AT listing, est. 35 days): £150
- Warranty (3-month dealer warranty): £150
Total costs: £1,150
Step 5: Calculate Net Profit
£4,700 - £1,150 = £3,550 net profit.
That's a solid deal. If the buyer takes finance, add another £400-600 in commission, bringing the total return to £3,950-£4,150.
A £3,550 net profit on a single car is a good day's work. But remember — you need to source, buy, prep, photograph, list, and sell the car. The real skill is doing this consistently, 15-20 times per month.
Quick Flip vs. Aged Stock: Two Different Strategies
Not every dealer plays the same game. The two main approaches to stock management produce very different margin profiles.
The Quick Flip (Under 14 Days)
Some dealers aim to turn every car within two weeks. They price aggressively — often 5-10% below AT retail — and accept a lower margin in exchange for speed.
- Typical net margin: £1,000-£2,000 per car
- Advantage: Fast cash return, lower holding costs, less capital tied up
- Disadvantage: You leave money on the table. A car you sell for £17,500 in a week might have sold for £18,900 in four weeks.
Quick flippers make their money on volume. If you can turn 25 cars a month at £1,500 net, that's £37,500 monthly gross profit. Not bad at all.
Aged Stock (30-60+ Days)
Other dealers hold firm on price and wait for the right buyer. They're aiming for maximum margin per car, accepting that some units will sit for 6-8 weeks.
- Typical net margin: £2,500-£4,000+ per car
- Advantage: Higher profit per unit, less volume needed
- Disadvantage: Holding costs accumulate. Every extra week a car sits costs you in depreciation, advertising, insurance, and opportunity cost.
The risk with aged stock is that cars depreciate while they're waiting to sell. A car that was worth £18,900 in week one might only be worth £18,200 by week eight if the market moves. Your margin shrinks with time.
The Sweet Spot
Most successful independents land somewhere in the middle. Price competitively but not cheaply — aim for a "Good" AT retail rating and expect to sell within 30-45 days. This balances healthy margins with reasonable turn times.
The key metric to track is return on investment per month. A car that makes £3,000 in 30 days has a monthly ROI of 100% of the net profit. A car that makes £3,500 in 60 days has a monthly ROI of only £1,750 equivalent. The first deal is actually better despite the lower headline margin.
How to Improve Your Margins
If your margins aren't where you want them, here are the levers you can pull:
- Source more widely. More platforms = more options = better buy prices. If you're only on one auction site, you're competing for the same cars as everyone else on that site.
- Check values religiously. Every car. Every time. No exceptions. One overbuy per month can wipe out the margin from two good deals.
- Reduce prep costs. Buy better condition stock, even if it costs a bit more upfront. A car that needs £300 in prep vs. one that needs £1,200 might have the same gross margin, but the net difference is £900.
- Increase finance penetration. Commission from dealer finance can add £200-800 per deal. At 50% penetration, that's a meaningful boost to your average net margin.
- Turn stock faster. Price to sell within 30-40 days. The cash you free up by selling one car faster can be reinvested in the next deal.
- Know your market. Understand what sells in your area. A dealer in central London has different demand than one in rural Wales. Stock what your customers actually want.
Where ScanAuctions Fits In
Everything in this guide comes back to one fundamental principle: know the numbers before you commit. The dealers who make the best margins aren't the ones with the best negotiation skills or the biggest forecourts. They're the ones who know, before they bid, exactly what a car is worth and what it'll cost to sell.
ScanAuctions shows you the net margin on every car before you bid. It factors in AT retail valuations and surfaces MOT data so you can estimate prep costs accurately. No more guessing. No more mental arithmetic. Just clear numbers that help you make better buying decisions.
Get started and run the numbers on your next batch of stock. You might be surprised at which cars are actually making you money — and which ones aren't.