Car Finance Deposit Calculator

What is a car finance deposit?

A car finance deposit is the lump sum you pay up front to reduce the amount you borrow. It is usually 10% of the price, but you can put down more or, on some deals, nothing at all.

Your deposit can be cash, the equity from a part-exchange, or a manufacturer contribution. Whatever the source, every pound of deposit is a pound you do not finance — and do not pay interest on.

Most lenders ask for around 10%, so a £2,000 deposit on a £20,000 car. A 0% deposit deal is possible but means a higher monthly and more interest overall, because you borrow the whole screen price and pay interest on every pound of it for the full term.

The deposit is paid before the finance starts, so it sits outside the agreement. You do not get it back if the car is written off or returned — but a bigger deposit does lower the finance, which lowers the monthly and the total interest together.

How does the deposit change your monthly payment?

The deposit cuts your monthly payment because you borrow less, and every pound you do not borrow is a pound you do not pay interest on. On a £20,000 car over 48 months at 9.9% APR, raising your deposit from £0 to £2,000 drops the monthly from about £502 to about £452.

The relationship is close to linear but not perfectly so, because interest is charged on the reducing balance. Roughly, every extra £1,000 of deposit on a 48-month deal at 9.9% APR cuts the monthly by about £25 — and cuts the total interest by about £200 over the term.

On PCP the effect on the monthly is similar, but the deposit also shifts where you sit relative to the balloon. A bigger deposit means you finance less of the car up front, so a larger share of any future equity is yours rather than the lender's. See exactly how on the PCP calculator.

How a bigger deposit cuts the total cost

A bigger deposit cuts the total amount payable as well as the monthly, because you pay interest on a smaller balance for every month of the term. The monthly is what you feel; the total is what it truly costs.

Notice the interest column falls faster than the monthly. Doubling the deposit from £2,000 to £4,000 cuts the monthly by about £50 but cuts the total interest by about £411 — because the saving compounds across all 48 months. This is the true-cost rule in action: always compare the total, not just the monthly.

The same logic applies on PCP and a personal loan — borrow less, pay less interest. Compare the deals fairly on the APR calculator, which turns any monthly quote back into a true-cost figure.

What counts as a deposit on car finance?

A deposit can be cash, part-exchange equity, a manufacturer contribution, or any combination of the three. The lender simply subtracts the total up-front amount from the car's price to set the amount financed.

Cash is the simplest: you hand over a lump sum and it is deducted before the finance begins. Part-exchange equity is the value of a car you trade in, minus any outstanding finance on it — work it out first with the part-exchange calculator.

A manufacturer or dealer deposit contribution is an incentive that lowers your amount financed without you paying it. These are common on new cars, often tied to a specific finance product, and they are genuine money off — but only if you take that deal. Weigh them on the new car finance calculator and the 0% deals page.

How much deposit should you put down?

Put down as much as you comfortably can without draining your savings or your emergency buffer. A bigger deposit cuts the cost, but it should not leave you short for emergencies or unable to insure and run the car.

There is no single right number, but a useful test is to ask whether you could still cover one month's bills if the car was off the road for a fortnight. If the deposit has drained that buffer, it is too big.

• Aim for at least 10% if you can — it is what most lenders expect and it keeps the monthly sensible on a £20,000 car that means £2,000 down.
• Keep an emergency buffer back; do not put your last pound into a deposit and then borrow on a credit card to run the car.
• On PCP, a bigger deposit lowers the monthly but the balloon stays the same, so check the total to own — see the balloon payment calculator.
• Avoid putting down more than the car is worth relative to its future value; an oversized deposit on a fast-depreciating car can leave you with no equity later.

No deposit, or a deposit you cannot afford?

You can usually get car finance with no deposit, but you will pay more each month and more in total, because you borrow the full price and pay interest on every pound of it. A guarantor or a stronger credit file can help if a no-deposit rate looks steep.

No-deposit deals suit buyers who need a car now and have the income to cover the higher monthly. The trade-off is real: on a £20,000 HP deal at 9.9% APR over 48 months, no deposit means about £502 a month and about £24,108 in total, against £452 and £23,697 with a £2,000 deposit.

If a deposit is the only thing standing between you and an affordable monthly, work backwards from a budget first with our eligibility estimate — it runs no credit check. You can also see what a monthly budget really buys on the affordability calculator.

Be wary of any deal that rolls fees or a negative-equity shortfall on top of a no-deposit finance amount. That raises the amount financed above the car's price, and you can be in negative equity from day one.

Does a deposit protect you from negative equity?

A bigger deposit lowers your chance of negative equity, because you start the agreement owing less relative to the car's value. Cars depreciate fastest in the first year, so the gap between what you owe and what the car is worth matters most then.

With no deposit on a £20,000 car, you owe the full price on day one while the car is already worth less. With £4,000 down, you owe £16,000 against a car worth roughly £17,000–£18,000 after a year's depreciation — so you hold a buffer of equity instead.

Check where you would stand across the whole term on the negative equity calculator. A sensible deposit is the single biggest thing you control that reduces negative-equity risk before you even sign.

Deposit on PCP vs HP vs a loan

The deposit works the same way on all three finance types — it lowers the amount financed — but the knock-on effects differ. On HP and a loan you own the car at the end; on PCP the deposit shifts your position relative to the balloon.

On PCP a bigger deposit lowers the monthly but the balloon is set separately by the lender, so the total to own falls by less than you might expect. On HP and a loan the saving flows straight through to the total. Compare all three properly on the PCP vs HP page.

Common deposit mistakes to avoid

The biggest deposit mistake is staring at the monthly and ignoring the total, or putting down nothing and then stretching the term to keep the monthly low. Both push the true cost up.

Was your finance deal mis-sold?

Some car finance from 2007–2024 carried hidden commission that raised your interest rate — which means you paid more, whatever your deposit. If yours did, you may be owed redress.

The FCA is running a redress scheme after the Supreme Court ruling of 1 August 2025. Estimate your position with the compensation estimator — it is an estimate, not a promise, and you can claim free yourself with no claims firm taking a cut.

Hidden commission raised the APR, which raised the interest on whatever you borrowed. A bigger deposit softened the blow but did not remove it, because you still paid an inflated rate on the amount you did finance.

Deposit and your loan-to-value ratio

Your deposit sets the loan-to-value ratio — the amount financed as a share of the car's price — and a lower ratio usually means a cheaper rate. Lenders reward borrowers who put more skin in the game.

A £2,000 deposit on a £20,000 car is a 10% deposit and a 90% loan-to-value (LTV). A £4,000 deposit is 20% down and 80% LTV. Lenders typically tier their rates around LTV bands, so stepping from 90% to 80% LTV can knock a percentage point or more off the APR you are offered — which compounds the saving from borrowing less in the first place.

This is why a bigger deposit can lower the cost twice over: you borrow less, and the rate on what you do borrow can fall. Use the eligibility calculator to see how different LTV bands might shift the rate available to you, with no credit check.

How this deposit calculator works

This calculator takes your price, deposit, term and APR, then shows the monthly payment and the total amount payable together — so you compare the deal on both numbers at once. Change the deposit and both figures move in the same direction.

The maths is the standard amortisation formula used across UK regulated finance. We finance the price minus the deposit, apply the monthly rate derived from the APR, and spread the result across the term. On PCP we subtract the present value of the balloon before dividing the monthly. The total payable is the deposit plus all the payments, plus the balloon on PCP if you keep the car.

Because the figures are estimates, treat them as a planning tool. Your real quote depends on the lender, the exact fees bundled into the APR, and your credit file. When you have a quote, run its monthly back through the APR calculator to confirm the true cost.