BIK Calculator (Benefit-in-Kind)
Calculate your company car tax liability accurately with our comprehensive BIK calculator
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Comprehensive Guide: How to Calculate BIK (Benefit-in-Kind) in 2024
Benefit-in-Kind (BIK) is a tax charged on employees who receive benefits or perks from their employer that aren’t included in their salary or wages. The most common BIK is for company cars, but it can also apply to other benefits like private medical insurance, interest-free loans, or accommodation.
This guide will walk you through everything you need to know about calculating BIK for company cars, including the latest rules for 2024-2025, how different fuel types affect your tax, and strategies to reduce your BIK liability.
What is Benefit-in-Kind (BIK)?
Benefit-in-Kind refers to any non-cash benefit that an employee receives from their employer. When it comes to company cars, BIK is the taxable value placed on the personal use of that vehicle. HM Revenue & Customs (HMRC) considers this a taxable benefit because you’re effectively receiving something of value (the use of a car) without paying for it directly.
The amount of BIK tax you pay depends on:
- The car’s P11D value (its list price including VAT and delivery but excluding first registration fee and road tax)
- The car’s CO₂ emissions
- The fuel type
- Your income tax band
- Whether the car is available for private use
- Any contributions you make towards the cost of the car
How BIK is Calculated: The Step-by-Step Process
Calculating your BIK tax involves several steps. Here’s how the process works:
- Determine the P11D value – This is the car’s list price including VAT and delivery charges, but excluding the first registration fee and road tax.
- Find the appropriate BIK percentage – This depends on the car’s CO₂ emissions and fuel type. HMRC publishes tables showing these percentages.
- Calculate the annual BIK value – Multiply the P11D value by the BIK percentage.
- Subtract any employee contributions – If you pay anything towards the cost of the car (e.g., for private fuel), this can be deducted.
- Apply your income tax rate – The remaining amount is added to your taxable income and taxed at your marginal rate.
BIK Percentage Tables for 2024-2025
The BIK percentage is primarily determined by the car’s CO₂ emissions. Here are the current bands:
| CO₂ Emissions (g/km) | Petrol Cars | Diesel Cars | Electric Range (miles) |
|---|---|---|---|
| 0 | 2% | 2% | 130+ |
| 1-50 | 2-14% | 5-17% | 70-129 |
| 51-54 | 15% | 18% | 40-69 |
| 55-59 | 16% | 19% | 30-39 |
| 120 | 28% | 31% | – |
| 150 | 32% | 35% | – |
| 170+ | 37% | 37% | – |
How Different Fuel Types Affect BIK
The type of fuel your company car uses significantly impacts your BIK percentage. Here’s how different fuel types are treated:
Electric Vehicles (EVs)
Electric cars with 0g/km CO₂ emissions have the lowest BIK rates:
- 2024-2025: 2% BIK rate
- 2025-2026: 2% BIK rate (then increasing by 1% per year until 2028)
This makes electric company cars extremely tax-efficient. For example, a £40,000 electric car would have a BIK value of just £800 in 2024-2025 (2% of £40,000).
Hybrid Vehicles
Hybrid vehicles are treated differently depending on their electric range:
- Plug-in hybrids with 130+ miles electric range: 2% BIK (same as pure electric)
- Plug-in hybrids with 70-129 miles range: 5-14% BIK depending on CO₂
- Plug-in hybrids with 40-69 miles range: 8-17% BIK
- Plug-in hybrids with 30-39 miles range: 12-21% BIK
- Mild hybrids (no plug-in capability): Treated as petrol/diesel based on CO₂
Petrol and Diesel Vehicles
Traditional petrol and diesel cars have higher BIK rates that increase with CO₂ emissions:
- Diesel cars have a 4% supplement (up to a maximum of 37%)
- Petrol cars follow the standard CO₂-based percentages
- Cars registered before April 2020 use the older NEDC CO₂ figures
| Car Type | P11D Value | CO₂ (g/km) | BIK % | Annual BIK Value | Tax for 40% Taxpayer |
|---|---|---|---|---|---|
| Electric (Tesla Model 3) | £42,000 | 0 | 2% | £840 | £336 |
| Plug-in Hybrid (Toyota Prius) | £35,000 | 28 | 8% | £2,800 | £1,120 |
| Petrol (BMW 3 Series) | £40,000 | 120 | 28% | £11,200 | £4,480 |
| Diesel (Mercedes C-Class) | £45,000 | 110 | 27% | £12,150 | £4,860 |
How to Reduce Your BIK Tax Liability
There are several legitimate ways to reduce the amount of BIK tax you pay:
-
Choose a lower-emission vehicle
The single biggest factor in BIK calculations is CO₂ emissions. Opting for an electric or low-emission hybrid can dramatically reduce your tax bill. For example, switching from a diesel car emitting 150g/km to an electric vehicle could reduce your BIK rate from 35% to just 2%.
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Make employee contributions
If you contribute towards the cost of the car (e.g., paying for private fuel or making a capital contribution), this amount can be deducted from the BIK value before tax is calculated.
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Opt for a cheaper car
The BIK value is calculated as a percentage of the car’s P11D value. Choosing a more modest vehicle will directly reduce your taxable benefit.
-
Consider salary sacrifice schemes
Some employers offer salary sacrifice schemes where you give up part of your salary in exchange for a company car. This can be tax-efficient, especially for electric vehicles.
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Check if you’re eligible for exemptions
Certain vehicles are exempt from BIK tax, including:
- Pool cars (not assigned to a specific employee and not normally kept overnight at an employee’s home)
- Vans with no significant private use
- Cars adapted for employees with disabilities
Common BIK Calculation Mistakes to Avoid
Calculating BIK can be complex, and errors can lead to underpaying or overpaying tax. Here are some common pitfalls:
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Using the wrong CO₂ figure
Cars registered before April 2020 use NEDC CO₂ figures, while newer cars use WLTP figures. Using the wrong measurement can significantly affect your calculation.
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Forgetting the diesel supplement
Diesel cars (that aren’t RDE2 compliant) have a 4% supplement added to their BIK percentage, up to a maximum of 37%.
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Incorrectly calculating employee contributions
Only certain types of contributions can be deducted from the BIK value. Make sure you’re applying the rules correctly.
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Ignoring the electric range for plug-in hybrids
The BIK percentage for plug-in hybrids depends on their electric range. Using the wrong range can lead to incorrect calculations.
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Not accounting for changes in tax bands
BIK percentages and tax bands can change each year. Always use the rates for the correct tax year.
BIK for Different Types of Vehicles
Company Vans
If your employer provides you with a van that you can use for private journeys, this is also a taxable benefit. The rules are different from company cars:
- Flat rate BIK value of £3,960 for 2024-2025 (£3,600 for 2023-2024)
- Additional £757 if fuel is provided for private use
- No CO₂-based percentages – the flat rate applies regardless of emissions
Electric Vans
Electric vans have a reduced BIK rate:
- £669 for 2024-2025 (down from £860 in 2023-2024)
- This will gradually increase to match the standard van rate by 2027-2028
Classic Cars
Classic cars (typically over 15 years old) are treated differently:
- BIK is calculated based on the car’s market value rather than its original P11D value
- The percentage is usually 15% of the market value
- You’ll need a professional valuation to determine the correct figure
BIK and Company Car Tax: What Employers Need to Know
If you’re an employer providing company cars, you have additional responsibilities:
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Reporting to HMRC
You must report all company cars provided to employees on form P11D after the end of each tax year (by 6 July).
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Paying Class 1A National Insurance
Employers must pay Class 1A NICs on the value of all benefits provided, including company cars. The rate is currently 13.8%.
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Keeping accurate records
You need to maintain records of:
- The car’s make, model, and registration number
- Date the car was first available to the employee
- P11D value and CO₂ emissions
- Any periods when the car wasn’t available
- Any employee contributions
-
Providing accurate information to employees
Employees need to know the BIK value of their company car so they can complete their self-assessment tax returns correctly.
Future Changes to BIK Rates
The government has announced planned increases to BIK rates for electric and low-emission vehicles:
- 2025-2026: Electric vehicles will remain at 2%, but this will increase by 1% in 2026-2027 and 2027-2028
- 2028-2029 onwards: Electric vehicles will be taxed at 5% (still significantly lower than petrol/diesel)
- Plug-in hybrids: Rates will gradually increase to encourage adoption of pure electric vehicles
- Petrol/diesel: No significant changes announced, but rates may be adjusted based on future emissions targets
These changes reflect the government’s strategy to encourage the adoption of zero-emission vehicles while maintaining tax revenue from company cars.
BIK Calculator: How to Use Our Tool
Our interactive BIK calculator at the top of this page makes it easy to estimate your company car tax liability. Here’s how to use it:
- Enter the car’s P11D value – This is the list price including VAT and delivery charges
- Input the CO₂ emissions – Found on the car’s V5C registration document
- Select the fuel type – Choose from petrol, diesel, electric, or hybrid
- Enter the registration date – Important for determining which emissions testing standard applies
- Indicate private use availability – If the car is available for private use, it’s taxable
- Add any employee contributions – Amounts you pay towards the car can reduce the taxable value
- Select your tax year and income tax band – This determines the final tax calculation
- Click “Calculate BIK Tax” – The tool will provide your annual and monthly tax liability
The calculator also generates a visual chart showing how different factors affect your BIK tax, helping you understand where potential savings could be made.
Frequently Asked Questions About BIK
Do I pay BIK tax if I only use the company car for business?
No. BIK tax only applies if the car is available for private use. If your employer provides a car that you only use for business journeys (and it’s not kept at your home overnight), it’s not a taxable benefit. However, HMRC has strict rules about what constitutes “private use” – even commuting to your normal workplace counts as private use.
How is BIK tax collected?
BIK tax is collected through the PAYE system if you’re an employee. Your employer will adjust your tax code to collect the tax due on your company car benefit. If you’re self-employed or a company director, you’ll need to report the benefit on your self-assessment tax return.
Can I avoid BIK tax by buying the car through my company?
If your company buys a car and makes it available to you for private use, it’s still a taxable benefit regardless of who technically owns it. The only way to avoid BIK tax is to either:
- Not have the car available for private use at all (true pool cars)
- Purchase the car personally and claim business mileage expenses
Does BIK apply to company cars provided to directors?
Yes. Company directors are treated the same as employees for BIK purposes. If a director uses a company car for private journeys, it’s a taxable benefit and must be reported on form P11D.
What happens if my company car changes during the tax year?
If you change your company car during the tax year, your BIK tax will be calculated pro-rata based on how long you had each car. Your employer should report this on your P11D.
Are there any exemptions for low-emission vehicles?
While electric vehicles have very low BIK rates (2% in 2024-2025), there are no complete exemptions for company cars based on emissions. However, the rates for low-emission vehicles are significantly reduced compared to petrol or diesel cars.
Alternative Arrangements to Company Cars
If the BIK tax on a company car seems too high, there are alternative arrangements you might consider:
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Car allowance
Instead of providing a company car, some employers offer a car allowance – a cash sum added to your salary that you can use to lease or buy your own car. This is taxed as normal income but gives you more flexibility in choosing a vehicle.
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Salary sacrifice schemes
These schemes allow you to give up part of your salary in exchange for a company car. The sacrifice reduces your taxable income, and you pay BIK tax on the car. These can be particularly tax-efficient for electric vehicles.
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Cash alternative
Some employers offer employees the choice between a company car or a cash alternative. You’ll need to compare the net value of each option to see which is better for you.
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Pool cars
If your employer provides pool cars that aren’t assigned to specific employees and aren’t kept at employees’ homes overnight, these aren’t subject to BIK tax when used for business journeys.
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Company van
If you don’t need a car, a company van might be a more tax-efficient option, especially if it’s electric (with a BIK value of just £669 in 2024-2025).
Each of these alternatives has different tax implications, so it’s important to calculate which option would be most cost-effective for your personal circumstances.
Final Thoughts on Calculating BIK
Understanding how to calculate BIK tax is essential for anyone with a company car or considering one. The tax implications can be significant, potentially adding thousands of pounds to your annual tax bill. However, by choosing the right vehicle and understanding the rules, you can minimize your liability.
Key takeaways:
- Electric vehicles offer the lowest BIK rates (just 2% in 2024-2025)
- CO₂ emissions are the primary factor in determining your BIK percentage
- Diesel cars have a 4% supplement unless they meet RDE2 standards
- Employee contributions can reduce your taxable benefit
- Always check the latest HMRC rates as they change annually
- Consider alternatives like car allowances or salary sacrifice schemes
For the most accurate calculation, always use our interactive BIK calculator at the top of this page, which incorporates all the latest rates and rules for the 2024-2025 tax year.