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Car Finance Calculator

Monthly payment, total interest and the full cost of the car, including sales tax, trade-in and fees.

Rates checked on Oct 25, 2026

Your result

Monthly payment£415.83
Total interest
£3,949.51
Total cost of the car
£28,949.51
  • Amount financed 84.2%
  • Total interest 15.8%
1Sales tax£0.00
2Amount financed£21,000.00
3Total interest£3,949.51
4Monthly payment£415.83
Show the yearly schedule
YearPrincipalInterestBalance
1£3,635.06£1,354.84£17,364.94
2£3,897.84£1,092.07£13,467.11
3£4,179.61£810.29£9,287.50
4£4,481.76£508.15£4,805.74
5£4,805.74£184.16£0.00
Markdown version for AI agents

Payments by loan term

Financing £21,000 at 7% APR
TermMonthly paymentTotal interest
36 months£648£2,343
48 months£503£3,138
60 months£416£3,950
72 months£358£4,778
84 months£317£5,623

How it's calculated

  1. Sales tax is charged on the price minus the trade-in value in most places.
  2. Amount financed = price + tax + fees − down payment − trade-in.
  3. Monthly payment = P × r / (1 − (1 + r)^−n), with r the APR ÷ 12.

Questions people ask

Is a longer car loan cheaper?
The monthly payment is lower but you pay more interest overall, and you may owe more than the car is worth for longer.
Does a bigger down payment help?
Yes. It lowers the amount financed, the payment and the total interest.

Reviewed by Soufyane S.. Last updated Oct 25, 2026. How we check numbers

Estimates for information only, not tax, legal or financial advice. Check with an adviser or the official tax authority.