Car Affordability Calculator
Work out the maximum car price you could realistically afford, based on your income, existing commitments and running costs — rather than starting from a loan amount you’ve already chosen.
Budget Breakdown
Sensitivity: % of Income Allocated
How your maximum car price shifts at different budgeting percentages, keeping everything else the same.
Sensitivity: Loan Term
How your maximum car price shifts with a longer or shorter loan term, at your chosen annual interest rate.
Sensitivity: Annual Interest Rate
How your maximum car price shifts with a different annual interest rate, at your chosen loan term.
Car Affordability Calculator
Our Car Affordability Calculator helps you work out the maximum car price you could realistically afford, starting from your income and budget rather than a loan amount you’ve already chosen. It’s the reverse of a typical car finance calculator: instead of telling you the monthly repayment on a car you’ve picked, it tells you what price range fits your budget in the first place.
How This Calculator Works
The calculation runs in four steps:
- Maximum car budget – your chosen percentage of net monthly income, minus any existing debt repayments.
- Maximum loan repayment – your car budget minus your estimated monthly running costs (insurance, fuel, tax, maintenance).
- Maximum loan amount – that monthly repayment converted into a loan amount using your chosen term and annual interest rate.
- Maximum car price – the maximum loan amount plus any deposit you have available.
Why Running Costs Aren’t Pre-Filled
Insurance, fuel, tax and maintenance costs vary hugely depending on the car, your age and location, driving history, and annual mileage — a single “average” figure would be misleading for most people. This calculator asks you to enter your own estimate, based on quotes or your current running costs, so the result reflects your actual situation rather than a generic assumption.
What the % of Income Guideline Means
Allocating a percentage of net income to total car costs is a widely used budgeting approach, but there is no official UK rule or universal recommendation for the exact percentage to use. This calculator uses 15% as an illustrative budgeting starting point, not a target or requirement — your own appropriate level depends on your financial goals, existing commitments and risk tolerance. You can adjust it here and see the effect immediately in the sensitivity table.
How Loan Term and Annual Interest Rate Affect What You Can Afford
| Factor | Effect on Max Loan Amount |
|---|---|
| Longer loan term | Increases max loan (same monthly payment spread over more months) but increases total interest paid |
| Shorter loan term | Decreases max loan but reduces total interest paid |
| Lower annual interest rate | Increases max loan for the same monthly payment |
| Higher annual interest rate | Decreases max loan for the same monthly payment |
A longer term or lower rate lets you afford a higher purchase price for the same monthly outlay — but a bigger loan over a longer period generally means paying more interest overall. The sensitivity tables above let you compare these trade-offs directly.
What This Calculator Doesn’t Do
- It isn’t a lending decision. Lenders assess affordability using your full credit history, existing commitments, and their own criteria — this may differ from the budget-based estimate here.
- It doesn’t include depreciation. A car’s value falls over time; this calculator focuses on what you can afford to pay, not the car’s future resale value.
- It doesn’t compare finance types. Personal loans, PCP and HP have different structures and costs — see our Car Loan Calculator and Car Finance Calculator to compare specific finance options once you have a price range in mind.
Worked Example
| Input | Value |
|---|---|
| Monthly net income | £2,500 |
| Max % of income for car costs | 15% |
| Existing monthly debt | £150 |
| Estimated running costs | £120 |
| Deposit available | £2,000 |
| Loan term | 48 months |
| Annual Interest Rate | 8.9% |
| Max monthly car budget | £225 |
| Max monthly loan repayment | £105 |
| Max car price | ~£6,255 |
Frequently Asked Questions
What percentage of income should I spend on a car?
There’s no official UK rule or universal recommendation for this. This calculator uses 15% as an illustrative budgeting starting point, not a standard percentage or requirement — what’s appropriate depends heavily on your other financial commitments and goals. You can adjust the percentage here and see the effect immediately in the sensitivity table.
Why do I need to enter my own running costs instead of an average?
Insurance, fuel, tax and maintenance vary enormously depending on the car, your age, location, driving history and annual mileage. A generic “average” figure could significantly overstate or understate what you’d actually pay, so this calculator asks for your own estimate — ideally based on an insurance quote or your current costs — for a more accurate result.
Does this replace a lender’s affordability check?
No. Lenders assess affordability using your full credit history, existing debts, income verification and their own lending criteria, which can differ from this budget-based estimate. This calculator is a planning tool to help you understand your own budget-based spending range before you apply for finance.
Should I use a longer loan term to afford a more expensive car?
A longer term reduces your monthly repayment and increases the loan amount you can afford, but it also means paying interest for longer, which increases the total cost of the car over the life of the loan. Use the loan term sensitivity table above to see the trade-off between affordability now and total cost over time.
What’s the difference between this and your Car Loan Calculator?
The Car Loan Calculator and Car Finance Calculator start from a car price or loan amount you’ve already chosen and calculate the resulting repayments. This calculator works the other way around: it starts from your income and budget and works out the maximum price you could afford in the first place.
Does a bigger deposit always help?
Yes — a larger deposit directly increases your maximum car price, pound for pound, since it’s added on top of your maximum loan amount. It can also reduce the total interest you pay over the loan term, since you’re borrowing less.