Calculate car finance with negative equity in the UK
Negative equity on car finance means you owe more than your car is worth. Use the calculator below to see what your monthly payment and total cost could be if you roll that shortfall into a new UK car loan. Estimates only—not financial advice.
Reviewed by: James Hartley, Independent personal finance editorLast updated:
Disclaimer
This calculator is for estimation only. It is not financial advice and does not represent a lending decision. Your actual affordability and car finance options in the UK depend on your circumstances and the criteria of individual UK lenders. Always check real quotes from lenders or speak to a regulated financial adviser before committing.
How it works
Work out your negative equity (settlement figure minus car value), add it to the price of your next car, and enter that combined amount in the calculator with your deposit, term and APR. The result shows the monthly payment and total repayable for borrowing the car plus the shortfall. You can also use our car finance calculator UK for standard loans without negative equity.
Negative equity car finance calculator
Your finance estimate
- Finance amount
- £20,000
- Monthly payment
- £478
- Total interest
- £2,944
- Total repayable
- £22,944
This is an estimate only. Your actual monthly payment and rate depend on the lender and your circumstances.
Tip: to include negative equity, add the shortfall to the car price (e.g. £18,000 new car + £2,000 negative equity = £20,000 financed). Set your real deposit separately—the finance amount will reflect borrowing for the car plus the negative equity.
Worked example: £18k car + £2k negative equity
You want a £18,000 car but owe £2,000 more than your current car is worth. A lender agrees to roll the shortfall in, so you finance £20,000 over 48 months at 6.9% APR with no deposit:
| Item | Amount |
|---|---|
| New car price | £18,000 |
| Negative equity rolled in | £2,000 |
| Amount financed | £20,000 |
| Term / APR | 48 months at 6.9% APR |
| Estimated monthly payment | £478 |
| Estimated total repayable | £22,944 (incl. ~£2,944 interest) |
Enter £20,000 as the car price in the calculator above to reproduce this example. Actual lender rates and fees may differ.
How to calculate negative equity on car finance
Start with your lender's settlement figure—the amount needed to close your current agreement today. Then get a realistic value for your car (trade-in quote, part-exchange offer or independent valuation). Subtract the car's value from the settlement figure. If the result is positive, that is your negative equity.
Example: settlement £10,000, car worth £8,000 → £2,000 negative equity. To model a new loan, add £2,000 to what you would otherwise borrow for the next car. If the new car is £18,000 with no deposit, enter £20,000 in the calculator. For used cars, see our used car finance calculator UK.
Should I roll negative equity into a new car loan?
Rolling negative equity is convenient when you need to change car before your current finance is paid off, but it increases both your monthly payment and total interest. You are borrowing more, so the shortfall costs you interest over the full new term.
Before committing, compare paying some or all of the shortfall upfront against rolling it in. Waiting until you reach positive equity—or choosing a cheaper next car—can reduce the amount you need to borrow. Not all UK lenders accept negative equity, and limits vary. Check what each lender offers and use the calculator to see the total cost difference before you decide.
Check your finance options
Use the calculators on this site to see a rough budget, then check live offers with UK finance providers. We are not a lender and we do not make lending decisions—everything here is an estimate only.
Calculators run in your browser and do not store personal details.
Negative equity car finance – frequently asked questions
What is negative equity on car finance in the UK?
Negative equity means you owe more on your car finance than the car is currently worth. It often happens when you want to change car before the loan is paid off, or when the car's value has dropped faster than your repayments. In the UK, some lenders let you roll this shortfall into a new finance agreement, but it increases what you borrow.
How do I calculate negative equity on car finance?
Ask your lender for the settlement figure (what you must pay to end the agreement today). Get a realistic trade-in or part-exchange value for your car. Negative equity is the settlement figure minus the car's value. If you owe £10,000 but the car is worth £8,000, you are £2,000 in negative equity. Add that £2,000 to the amount you need to finance on your next car to see the combined loan.
How can a negative equity car finance calculator UK help?
A calculator helps you see what happens when you add negative equity to a new loan. Enter the new car price plus the amount you are in negative equity as an extra amount to finance, then see the resulting monthly payment and total cost. Our calculator below works by treating new car price plus negative equity as the amount to borrow.
Should I roll negative equity into a new car loan?
Rolling negative equity into a new UK car finance deal increases your debt and monthly payment. It can be convenient if you need to change car, but you will pay more overall. Consider paying off some of the shortfall first, or waiting until you are in positive equity, if possible. This is not financial advice—speak to a lender or adviser.
Do all UK lenders accept negative equity?
No. Not all UK car finance lenders will allow you to add negative equity to a new agreement. Rules and limits vary. Our calculator is for illustration only; you must check with lenders what they offer.
Can negative equity affect PCP or HP when changing car?
Yes. On PCP, handing back a car worth less than the remaining finance creates a shortfall you may need to pay or roll into a new deal. On HP, selling or part-exchanging before the loan is settled can leave you owing the difference. Use our PCP vs HP calculator to compare structures, then model the combined loan here if a lender agrees to add the shortfall.
Sources & notes
Our calculators and guides draw on publicly available UK guidance. We review content periodically but do not guarantee that external sources remain unchanged. See our about page for how we use these tools.
Sources
- MoneyHelper – How to find the right way to buy a car
General guidance on budgeting and car finance options in the UK.
- MoneyHelper – Work out your budget
Household budgeting principles used alongside affordability rules of thumb.
- FCA – Consumer credit and your rights
Regulatory context for regulated car finance agreements.
- FCA Handbook – CONC 5.2A (creditworthiness and affordability)
How FCA-regulated lenders must assess affordability (illustrative reference).
- Black Horse – Car finance (sample lender information)
Example of how a major UK motor-finance provider describes its products.
- Santander – Car finance (sample lender information)
Example lender product information; rates and criteria vary by provider.
Compliance notes
- Car Affordability UK is not authorised or regulated by the Financial Conduct Authority (FCA). We do not provide regulated financial advice, credit broking or lending.
- Calculator outputs are illustrative estimates based on the inputs you provide and published third-party guidance. They are not quotes, offers of credit or lending decisions.
- FCA-regulated lenders apply their own affordability assessments, which may differ from the percentage rules of thumb used on this site. Always check formal terms before signing any agreement.
- We may earn commission if you follow links to third-party finance comparison services. This does not affect how our calculators work or how content is reviewed.