0% Finance vs a Cash Discount: Which Is Cheaper?

How to extract both prices from a dealer

The dealer won't volunteer both prices — you have to ask for each explicitly, in writing, before the comparison is honest.

Dealers are trained to lead with whichever option suits them, which is usually the finance deal (because they earn commission on it) or the cash sale at full price (because there's no discount to give). To get a real comparison, you need to ask for both explicitly: 'What's my best cash price, with every discount?' and separately, 'What's the total amount payable on the 0% finance deal, including deposit and any fees?'

Get both in writing. A verbal quote is easy to retract or 'misremember' once you're in the finance office. A written quote — even a scribbled figure on the sales sheet — pins the numbers down so you can compare them on the APR and true-cost calculator at your leisure, without the sales pressure. If a dealer won't put both prices in writing, that's a signal to walk away.

A useful tactic: ask for the cash price first, with the discount, and only then mention that you're also considering finance. This stops the dealer from holding back the cash discount on the assumption you'll take finance. Once you have both written prices, the maths does the rest — and you're deciding on numbers, not on sales narrative.

1. Ask for the cash price with every available discount, in writing.
2. Ask separately for the total amount payable on the 0% finance deal, in writing.
3. Run both through the APR and true-cost calculator to confirm they're honest.
4. Weigh the difference against what keeping your savings would earn over the term.
5. Take whichever route has the lower net cost — and walk away if the dealer won't put both in writing.

The third route: take the discount, finance it cheaply elsewhere

You're not limited to dealer finance or dealer cash — a personal loan from a bank can let you take the cash discount AND avoid paying full price.

There's a third option buyers often miss: take the cash discount, then borrow the discounted amount on a cheap personal loan from your bank. This splits the difference between the two dealer routes — you get the lower price (the discount) and you spread the cost (the loan), paying some interest but far less than you'd lose by forgoing the discount.

On a £20,000 car with a £1,500 discount, financing the £18,500 balance on a 7% personal loan over 36 months costs about £160 in interest — so the discounted-plus-loan route totals roughly £18,660, against £20,000 for the 0% deal at full price. That's £1,340 cheaper than the 0% route, and you own the car outright with no mileage limits. The 0% rate is genuinely free, but the discount-plus-loan is genuinely cheaper.

This is why the comparison deserves all three routes, not just the two the dealer offers. Run the maths on the car loan calculator and the APR and true-cost calculator before you commit to anything, and ask your bank for a soft-search quote so you know your benchmark rate. The cheapest route is often the one the dealer didn't mention.

Depreciation, timing and the true total

The 0%-vs-discount call also turns on when you pay, what the car will be worth when you finish paying, and whether the deal ties you to a balloon at the end. Run the comparison on what you hand over across the whole ownership period, not just the day you sign.

Timing of payment matters more than people expect. A cash discount puts the whole sum to work for the dealer on day one — you've spent the money, it's gone, and any return it might have earned is lost. A 0% deal keeps your savings earning interest across the full term, which compounds quietly in your favour: at a 4% savings rate, £18,500 kept for three years earns about £2,260, as the worked example shows. That return isn't a marketing claim, it's what a competitive savings account or Cash ISA actually pays — and it's the reason a small discount can lose to a 0% deal even when the sticker gap looks clear.

Depreciation interacts with this in one specific way. Whichever route you take, the car loses value fastest in years one to three, and you're paying for it across that same window. On a true 0% deal the car is usually on PCP, which means there's a balloon at the end and you only own it if you pay that balloon. The cash-discount route tends to mean you own the car outright (you paid for it), so when you come to sell there's no balloon to settle and no mileage charges to worry about — the depreciation is yours to crystallise. That's a flexibility advantage for the cash route that doesn't show up in the finance maths but matters at sale time.

The cleanest way to handle both is to compare on a total-cost-to-own basis over the years you realistically expect to keep the car. Add what you pay in interest (zero on 0%), the discount you forgo, and any balloon or end-of-agreement fees on the 0% side; on the cash side add the discount you gain and the interest your savings would have earned. That single side-by-side, run on the APR and true-cost calculator and checked against your savings rate, almost always makes the cheaper route obvious — and if it's genuinely close, ownership flexibility tips it toward cash.

Work out your own numbers

Put the discounted cash price next to the full-price 0% total, weigh the difference against what keeping your savings earns, and check the discount-plus-loan route as well.

Use the APR and true-cost calculator to confirm a 0% deal is genuine, and read 0% car finance deals to spot the catches. For the wider call, see finance vs paying cash. The three numbers that decide it are the size of the cash discount, the interest you'd pay (zero, on a true 0% deal), and the return your savings would earn if kept — but run all three routes, including discount-plus-loan, because the cheapest option is often the one the dealer didn't mention.