Car Affordability Calculator UK
Discover how much car you can realistically afford based on your exact net take-home pay. Model PCP, HP, Cash, and EV Salary Sacrifice alongside true UK running costs using the 20/4/10 personal finance rule.
Income & Take-Home Pay (2026/27)
Vehicle Price & Finance Method
Running Costs & Fuel / Electricity
Monthly Motoring Bill
Consumes 15%–20% of net income. May restrict savings, holidays, or mortgage overpayments.
How Much Car Can You Really Afford in the UK?
When purchasing or leasing a vehicle in the UK, many drivers make the critical error of looking solely at the headline monthly finance repayment advertised by dealerships. However, the finance repayment represents merely the tip of the motoring iceberg.
True vehicle affordability is dictated by the Total Cost of Ownership (TCO)—incorporating finance interest, comprehensive insurance, Vehicle Excise Duty (VED road tax), fuel or electric charging, routine servicing, MOTs, and replacement tyres—evaluated against your actual net take-home pay under current UK PAYE tax thresholds.
The 20/4/10 Rule of Vehicle Affordability
The 20/4/10 rule is one of the most robust, battle-tested financial benchmarks to prevent buyers from becoming 'car poor':
Pay at least 20% upfront in cash or part-exchange equity. This shields you against early depreciation and negative equity traps.
Finance over 48 months or fewer. Terms extending to 60 or 72 months incur excessive interest and guarantee negative equity.
All-in motoring costs (finance + insurance + VED + fuel + maintenance) must stay below 10% gross or 15% net take-home pay.
PCP vs HP vs Cash vs EV Salary Sacrifice
| Finance Method | Monthly Outlay | Ownership at End | Best Suited For |
|---|---|---|---|
| PCP (Personal Contract Purchase) | Moderate (pays depreciation + interest) | Optional balloon payment (GMFV) | Drivers changing cars every 3 to 4 years |
| HP (Hire Purchase) | Higher (amortizes full vehicle price) | Automatic 100% ownership | Buyers keeping cars for 5 to 10+ years |
| EV Salary Sacrifice | Lowest net cost (30%–50% tax savings) | Hand back or renew | Higher rate employees switching to EV |
| Cash Purchase | £0 monthly finance interest | Immediate 100% ownership | Buyers with capital wishing to avoid finance debt |
Hidden Running Costs & The £40k Expensive Car Tax Surcharge
Beyond monthly finance payments, UK vehicle owners face three major running cost traps:
- The £40,000 Expensive Car Supplement: If a vehicle's original list price (including options and delivery before discounts) exceeds £40,000, you are hit with an additional £410 per year in VED road tax from year 2 through year 6. That adds over £2,050 in extra tax over a standard 5-year ownership window!
- Surging Car Insurance: UK motor insurance premiums remain elevated, with young drivers and high-group vehicles regularly commanding £1,200 to £2,500 annually.
- Fuel vs Smart EV Charging: A typical 10,000-mile petrol driver spends approximately £1,530 annually on fuel. An EV driver charging at an off-peak domestic smart tariff (such as 7.5p/kWh) spends only £200 to £250 annually, saving roughly £1,300 in pure cash every year.
Frequently Asked Questions About Car Affordability
Frequently Asked Questions
Clear answers based on official HMRC rules and statutory guidance.
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Use your actual take-home pay and spending
A budget or affordability illustration organises the figures you enter. It does not determine a lending decision or establish what housing, food or transport should cost in your area.
Use actual bills, debts, savings goals and household commitments. Percentage rules are optional planning frameworks, not a requirement or a prediction of future investment returns.
Check the rules for your circumstances
Official guidance supports the rules described here; it does not approve or certify this calculator. Confirm dates, eligibility and unsupported cases before making a financial decision.