Company car Benefit-in-Kind (BIK) tax is the tax an employee pays when their employer provides them with a car for private use. The taxable value (the BIK) is calculated by multiplying the car's P11D value (broadly the list price including options) by an appropriate percentage derived from HMRC's CO2 emissions table. The employee pays income tax on this BIK value at their marginal rate (20%, 40%, or 45%), and the employer pays Class 1A National Insurance Contributions (NICs) at 13.8% on the same BIK value. For the 2024-25 tax year, electric vehicles (EVs) and zero-emission cars benefit from a 2% appropriate percentage — a very low rate designed to encourage EV adoption. Petrol and hybrid cars range from 13% to 37% depending on CO2 emissions. Diesel cars carry an additional 4% surcharge unless they meet the RDE2 standard. Where the employer also provides fuel for private mileage, there is a separate fuel benefit charge based on a multiplier of £27,800 for 2024-25, multiplied by the same CO2 percentage as the car itself. The fuel benefit is frequently not worth taking if the employer offers reimbursement per mile instead.
BIK = P11D value × CO2 appropriate percentage; Employee tax = BIK × income tax rate; Employer NIC = BIK × 13.8%; Fuel BIK = £27,800 × CO2 percentage
- 1Find the car's P11D value — the manufacturer's list price including VAT and all factory-fitted accessories, but excluding the first-year registration fee and road tax
- 2Look up the appropriate percentage from HMRC's CO2/electric range table based on the car's CO2 emissions in g/km
- 3Calculate BIK: P11D value × appropriate percentage
- 4Calculate employee tax: BIK × income tax rate (20%/40%/45%)
- 5Calculate employer Class 1A NIC: BIK × 13.8%
- 6If employer provides fuel for private use, calculate fuel BIK = £27,800 × CO2 appropriate percentage, then apply income tax and employer NIC to this amount too
- 7Add diesel surcharge of 4% if the vehicle does not meet RDE2 standard (check with manufacturer)
£45,000 × 2% = £900 BIK. Employee tax: £900 × 40% = £360. Employer NIC: £900 × 13.8% = £124.20.
The 2% appropriate percentage for EVs dramatically reduces BIK tax compared to petrol equivalents, making EVs highly tax-efficient company cars.
£30,000 × 31% = £9,300. Tax: £9,300 × 20% = £1,860. Employer NIC: £9,300 × 13.8% = £1,283.
A mid-range petrol car creates a substantial BIK tax charge. Over 3 years the employee would pay £5,580 in tax compared to just £1,080 for an equivalent EV.
Diesel surcharge of 4% adds 4% to the percentage unless the car meets RDE2 standard.
Diesel cars not meeting the RDE2 emissions test carry a 4% surcharge on the appropriate percentage. This makes many modern diesel cars significantly more expensive from a BIK perspective.
£27,800 × 31% = £8,618. Tax: £8,618 × 40% = £3,447.
Free employer fuel for private mileage is rarely tax-efficient unless you drive extremely high mileages. Most employees are better off paying for their own private fuel.
Employees choosing between a company car, electric vehicle, or cash car allowance at salary review, representing an important application area for the Uk Car Benefit Tax in professional and analytical contexts where accurate uk car benefit tax calculations directly support informed decision-making, strategic planning, and performance optimization
Fleet managers calculating the total BIK tax cost of a proposed fleet to inform vehicle policy, representing an important application area for the Uk Car Benefit Tax in professional and analytical contexts where accurate uk car benefit tax calculations directly support informed decision-making, strategic planning, and performance optimization
HR teams advising employees on the tax implications of different vehicles in the company car scheme, representing an important application area for the Uk Car Benefit Tax in professional and analytical contexts where accurate uk car benefit tax calculations directly support informed decision-making, strategic planning, and performance optimization
Company car drivers deciding whether to opt out of the fuel benefit, representing an important application area for the Uk Car Benefit Tax in professional and analytical contexts where accurate uk car benefit tax calculations directly support informed decision-making, strategic planning, and performance optimization
Financial advisers helping clients with multiple options assess the most tax-efficient company car strategy, representing an important application area for the Uk Car Benefit Tax in professional and analytical contexts where accurate uk car benefit tax calculations directly support informed decision-making, strategic planning, and performance optimization
Making Good (Employee Contributions)
{'title': 'Making Good (Employee Contributions)', 'body': 'If the employee makes a capital contribution toward the cost of the car at the outset (up to £5,000 maximum), this reduces the P11D value used for BIK calculation. If the employee pays the employer for private use during the year, this reduces the taxable BIK by the amount paid.'}
Pool Cars
{'title': 'Pool Cars', 'body': "Pool cars are cars kept by the employer for business use by multiple employees, not allocated to any one employee, and not taken home overnight. Pool cars are exempt from BIK taxation provided strict conditions are met. The car must not normally be kept at employees' homes."}
Salary Sacrifice for Electric Vehicles
{'title': 'Salary Sacrifice for Electric Vehicles', 'body': "Salary sacrifice arrangements for EVs are particularly tax-efficient because the low 2% BIK is much cheaper than income tax and NI on the equivalent salary sacrifice amount. HMRC exempts EVs from the 'relevant motoring expenditure' rules that restrict salary sacrifice for high-emission cars."}
| CO2 (g/km) / Type | Appropriate Percentage |
|---|---|
| 0g/km (electric) | 2% |
| 1-50g/km (electric range 130+ miles) | 2% |
| 1-50g/km (electric range 70-129 miles) | 5% |
| 1-50g/km (electric range 40-69 miles) | 8% |
| 51-75g/km | 17% |
| 76-100g/km | 23% |
| 101-125g/km | 28% |
| 126-150g/km | 33% |
| 151-175g/km | 36% |
| 176g/km+ | 37% |
What is the appropriate percentage for an electric vehicle?
Zero-emission and fully electric vehicles have an appropriate percentage of 2% for 2024-25. This rate was set to encourage EV adoption and is significantly lower than petrol or diesel cars. This is particularly important in the context of uk car benefit tax calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise uk car benefit tax computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
What is the diesel surcharge?
Diesel cars that do not meet the RDE2 (Real Driving Emissions 2) standard have a 4% surcharge added to their CO2 appropriate percentage. Most cars registered before September 2018 attract this surcharge. Check with the manufacturer for compliance status. This is particularly important in the context of uk car benefit tax calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise uk car benefit tax computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
How is the P11D value calculated?
The P11D value is the manufacturer's list price including VAT and accessories, but excluding the first registration fee and annual road tax. Discounts given to the employer do not reduce the P11D value — it is always based on the retail list price. This is particularly important in the context of uk car benefit tax calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise uk car benefit tax computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
What is fuel benefit and is it worth having?
Fuel benefit applies when an employer pays for any private fuel. The tax charge is based on £27,800 (2024-25) × the CO2 appropriate percentage. For most drivers, it is not tax-efficient unless they drive very high private mileages — a personalised calculation is needed. This is particularly important in the context of uk car benefit tax calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise uk car benefit tax computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
Can I reduce my company car BIK during the year?
The BIK can be reduced pro-rata if you give up the car mid-year, or if the car is unavailable for 30+ consecutive days (e.g. during a major repair). HMRC allows a time-apportioned reduction in these cases. This is particularly important in the context of uk car benefit tax calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise uk car benefit tax computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
What is Class 1A National Insurance?
Class 1A NIC is paid by the employer (not the employee) on benefits in kind like company cars. The rate is 13.8% on the BIK value. This is an additional employer cost over and above the employee's income tax on the benefit. This is particularly important in the context of uk car benefit tax calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise uk car benefit tax computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
Does a hybrid car get the same low BIK as an EV?
No. Plug-in hybrid vehicles (PHEVs) have BIK rates based on their CO2 emissions and the electric range. Cars with zero CO2 emissions on WLTP testing qualify for 2%. PHEVs with electric ranges under 130 miles typically have appropriate percentages of 5-12%. This is particularly important in the context of uk car benefit tax calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise uk car benefit tax computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
Is it better to have a company car or a car allowance?
This depends on the car's BIK rate and the allowance amount. An EV company car at 2% BIK may be more tax-efficient than a cash allowance, which is subject to income tax and NI in full. High-BIK petrol cars often make a cash allowance more attractive. This is particularly important in the context of uk car benefit tax calculations, where accuracy directly impacts decision-making. Professionals across multiple industries rely on precise uk car benefit tax computations to validate assumptions, optimize processes, and ensure compliance with applicable standards. Understanding the underlying methodology helps users interpret results correctly and identify when additional analysis may be warranted.
Pro Tip
If you have the choice between a company car and a car allowance, calculate the BIK on the car first. For EVs with a 2% BIK, the tax is minimal — a £50,000 EV costs a higher-rate taxpayer only £400/year in tax. For high-emission cars, the car allowance may be significantly more tax-efficient.
Did you know?
The government's drive to push company car drivers toward EVs through the 2% BIK rate is working — fleet sales of EVs have grown dramatically since the incentive was introduced, with fleet registrations consistently outpacing private EV sales. Fleet channels now account for over 60% of all new EV registrations in the UK.