UK Company Car Benefit in Kind Tax: Guide for 2025/26
This guide covers how the UK company car Benefit in Kind (BiK) tax operates for the 2025/26 tax year. Learn how CO2 emissions influence tax rates, calculate potential liabilities for petrol or electric models, and understand key changes to HMRC classification rules.
The company car Benefit in Kind (BiK) tax is a UK tax applied to employees who use an employer-provided vehicle for personal journeys, including commuting. Under HM Revenue and Customs (HMRC) rules, you pay income tax based on the vehicle's retail value and carbon emissions instead of your cash salary. HMRC collects this tax automatically by lowering your personal allowance through PAYE tax code adjustments rather than deducting it directly from your monthly payslip.
Key Takeaways: 2025/26 Company Car Tax
The 2025/26 tax year introduces key updates to vehicle tax bands and definitions that impact employee financial liabilities:
- Pure electric vehicles see their Benefit in Kind rate rise from 2% to 3% for the 2025/26 tax year.
- Double cab pick-up vehicles registered after 6 April 2025 are now treated as cars rather than vans for BiK calculations.
- The maximum Benefit in Kind tax rate remains capped at 37% for the highest-polluting combustion vehicles.
- Electric car charging at a workplace does not trigger any HMRC fuel benefit charges.
What is Company Car Benefit in Kind (BiK) tax?
Company car Benefit in Kind tax is a non-cash fringe benefit tax levied on employees who are provided with a vehicle by their employer for private use. Under standard HMRC guidelines, any private travel, including regular commuting between your home and permanent workplace, renders the vehicle a taxable benefit.
This tax is not deducted from your gross pay packet. Instead, HMRC alters your individual tax code to reduce your tax-free personal allowance. As a result, your employer deducts more Pay As You Earn (PAYE) income tax from your remaining cash salary each month.
How is company car tax calculated?
To determine your annual company car tax bill, HMRC uses a structured formula based on the car's list price, its carbon emissions, and your personal income tax bracket.
- Identify the P11D value: This is the official list price of the car on its day of registration. It includes VAT and optional extras, but excludes the first registration fee and annual road tax.
- Apply capital contributions: Deduct any personal capital contributions you made toward purchasing the vehicle, up to a maximum limit of £5,000, to lower the P11D value under Section 132 of the Income Tax (Earnings and Pensions) Act 2003.
- Determine the BiK rate (appropriate percentage): Find the appropriate percentage rate determined by the car's official CO2 emissions and electric battery range.
- Calculate the taxable benefit: Multiply the adjusted P11D value by the appropriate percentage rate to find the taxable benefit value.
- Apply your income tax rate: Multiply this taxable benefit value by your marginal personal tax rate, which is 20% for basic rate, 40% for higher rate, or 45% for additional rate taxpayers.
What are the 2025/26 BiK bands?
The appropriate percentages for vehicles registered after 6 April 2020 are calculated based on brackets of carbon dioxide output. Hybrid vehicles are also categorised by their electric-only mileage range.
| CO2 Emissions (g/km) | Electric Range (Miles) | 2025/26 BiK Rate |
|---|---|---|
| 0 (Pure Electric) | — | 3% |
| 1 to 50 | More than 130 | 3% |
| 1 to 50 | 70 to 129 | 6% |
| 1 to 50 | 40 to 69 | 9% |
| 1 to 50 | 30 to 39 | 13% |
| 1 to 50 | Less than 30 | 15% |
| 51 to 54 | — | 16% |
| 55 to 59 | — | 17% |
| 60 to 64 | — | 18% |
| 65 to 69 | — | 19% |
| 70 to 74 | — | 20% |
| 100 to 104 | — | 26% |
| 120 to 124 | — | 30% |
| 160 to 164 | — | 35% |
| 170 or more | — | 37% |
Diesel-powered cars that do not meet the Real Driving Emissions 2 (RDE2) compliance standard are subject to an additional 4% surcharge. This surcharge is added directly to their appropriate percentage up to the maximum cap of 37%.
Worked examples: Electric vs Petrol car tax
Choosing an electric vehicle offers significant tax advantages over standard combustion options. The table below compares the annual tax liabilities for a pure electric vehicle against a medium-emission petrol car.
| Comparison Metric | Example EV (VW ID.4) | Example Petrol Car |
|---|---|---|
| P11D Value | £44,305 | £30,000 |
| CO2 Emissions | 0 g/km | 120 g/km |
| Appropriate percentage | 3% | 29% |
| Taxable BiK Value | £1,329 | £8,700 |
| Annual Tax (20% Taxpayer) | £266 | £1,740 |
| Annual Tax (40% Taxpayer) | £532 | £3,480 |
How does the fuel benefit charge work?
When an employer funds fuel for your private journeys, you must pay tax on this benefit. HMRC calculates this using a fixed statutory base rate multiplied by the car's BiK rate.
- The statutory flat-rate fuel multiplier is set at £28,200 for the 2025/26 tax year.
- The taxable fuel benefit value is calculated by multiplying £28,200 by your car's dynamic appropriate percentage.
- Electricity is not classified as fuel by HMRC, meaning electric vehicles are completely exempt from private fuel benefit charges.
What are the employer obligations for P11D reporting?
Employers hold strict reporting responsibilities to ensure that employee benefit taxes and national insurance liabilities are declared and paid accurately.
- Calculate Class 1A contributions: Employers must calculate Class 1A National Insurance contributions, set at 15% of the total taxable car benefit value for the 2025/26 year.
- Submit individual P11D forms: Employers must prepare and file a P11D form for each employee who used a company car during the tax year.
- Submit the P11D(b) summary: File form P11D(b) to declare the total employer Class 1A National Insurance contributions due.
- Adhere to the filing deadline: Submit all P11D and P11D(b) forms electronically to HMRC by 6 July following the end of the tax year.
How does the double cab pick-up tax loop-hole change in 2025/26?
For any double cab pick-up vehicles registered after 6 April 2025, HMRC no longer classifies them as commercial vans. They are instead treated as cars for BiK purposes, meaning their tax calculations will now be based on high passenger-car CO2 emission bands.
Can I reduce my BiK tax if the company car is unavailable?
Yes. If your company car is physically or legally unavailable to you for a period of at least 30 consecutive days, your annual Benefit in Kind calculation can be reduced proportionally for that period.
What is the maximum BiK rate for diesel company cars?
The maximum Benefit in Kind rate is capped at 37%. Diesel cars that fail to meet RDE2 standards carry a 4% surcharge, but the total appropriate percentage cannot exceed this 37% limit.
Does charging an electric company car at work trigger a fuel benefit tax?
No. Under HMRC guidance, company-provided electricity for charging an electric vehicle does not constitute a fuel benefit, meaning it remains free of tax.