For many employees, a company car is one of the most coveted workplace perks. It offers the luxury of a brand-new vehicle, comprehensive insurance, and regular servicing—all without the personal financial burden of financing, maintaining, or repairing a private car.
However, these perks are not tax-free. Under the UK tax system, receiving a car for personal use is classified as a Benefit-in-Kind (BiK). This means the government views the car as a form of non-cash income, and you are required to pay tax on its value.
How Company Car Tax is Calculated
To determine your annual tax bill, you need to understand three specific variables:
- Your Income Tax Band: The amount you pay depends on your total annual salary.
- Basic Rate (20%): Up to £50,270
- Higher Rate (40%): £50,271 to £125,140
- Additional Rate (45%): Over £125,140
- The P11D Value: This is the official list price of the vehicle, including all optional extras and delivery charges. Note that it does not include road tax or dealer discounts.
- The BiK Percentage Rate: This is a percentage applied to the P11D value, determined by the vehicle’s CO2 emissions and its electric range.
The Formula in Action
To find your annual cost, follow these two steps:
* Step 1: Multiply the P11D value by the BiK percentage rate to get the taxable value.
* Step 2: Multiply that taxable value by your personal income tax rate.
Example: If you are a Basic Rate taxpayer driving a car with a £30,000 P11D value and a 26% BiK rate, your calculation would be:
£30,000 x 26% = £7,800 (Taxable Value)
£7,800 x 20% = £1,560 (Annual Tax Bill) **
The Shifting Landscape: EVs and Hybrids
Historically, electric vehicles (EVs) were the “golden ticket” for company car drivers because they attracted zero BiK tax. While EVs remain the most tax-efficient option, the era of total tax exemption is ending.
The Trend Toward Higher Costs
The government uses BiK rates as a lever to influence consumer behavior. To encourage a transition to greener energy, they have kept EV rates low, but they are gradually increasing. From the 2025/26 tax year, EV BiK rates will rise by 1% every year until 2028.
Similarly, for petrol and diesel vehicles, the BiK rates scale upward based on emissions. The most polluting vehicles can face BiK rates as high as 37%.
Choosing Your Powertrain
- Electric Vehicles (EVs): Still the cheapest to run if you can charge at home. However, drivers should be mindful of rising BiK rates and the potential costs of public charging for long-distance trips.
- Plug-in Hybrids (PHEVs): These offer a middle ground but are seeing their tax advantages slowly diminish as government incentives fade.
- Diesel/Petrol: Generally the most expensive option due to high CO2 emissions, which trigger significantly higher BiK percentages. Note: Diesel cars that do not meet the RDE2 emission standard face an additional 4% BiK surcharge.
Additional Costs: Road Tax (VED)
It is important to note that “road tax” (Vehicle Excise Duty) is also changing. For the 2025/26 tax year, rates have increased to £195 (adjusted for inflation). Crucially, electric vehicles are no longer exempt from VED and are now liable for this standard rate.
Summary of Key Terms
- BiK (Benefit-in-Kind): Tax on non-salary perks provided by an employer.
- P11D Value: The official list price of the car used for tax purposes.
- WLTP/RDE2: The modern, stricter standards used to measure vehicle emissions.
- Salary Sacrifice vs. Company Car: While both involve pre-tax deductions, a company car is generally more beneficial as the employer covers the vehicle’s finance and maintenance, whereas salary sacrifice usually requires the employee to bear those costs.
Conclusion
While company cars remain a high-value perk, the financial landscape is shifting. As BiK rates for electric vehicles gradually rise and tax exemptions for hybrids diminish, drivers must carefully weigh the P11D value and emission ratings of their vehicles to minimize their annual tax liability.
