Buying a car through your business, whether you operate as a sole trader or through a limited company can offer tax advantages, but it is not automatically the most tax-efficient option.
The tax treatment depends on how your business is structured, how it is is used, its CO₂ emissions, how you finance it, and whether there is any private use.
For limited companies, Benefits in Kind (BIK) rules are important. For sole traders, the choice between claiming actual costs and using mileage rates can make a significant difference.
Why Consider Buying a Car Through Your Business?
A business can buy or lease a vehicle for business purposes.
However, whether you should buy one through your business is a separate question.
Depending on your circumstances, buying or leasing through the business may allow you to claim:
- Capital allowances on a purchased vehicle
- Business running costs such as insurance, servicing and repairs
- Lease payments, subject to the relevant tax restrictions
- Business fuel costs
- VAT on certain motoring expenses, where the VAT rules allow it
For a limited company, however, private use of a company car can create a taxable Benefit in Kind (BIK) for the employee or director.
For a sole trader, there is no company-car BIK charge, but you generally need to distinguish between business and private use.
Questions to Ask Before Buying a Business Car
Before committing to a vehicle, considerations should include:
- Will it be be used privately as well as for business?
- How many business miles will you drive each year?
- What are its CO₂ emissions?
- Is it fully electric, a plug-in hybrid, petrol or diesel?
- Will you buy it outright, use hire purchase or lease it?
- Will the business or you personally pay for fuel or charging?
- Will you have a taxable company-car BIK?
- How much VAT can you recover?
- Will you lose or affect your personal no-claims bonus?
- Would personal ownership and claiming business mileage be better?
- Would a car allowance or salary sacrifice arrangement be more appropriate?
- How will the purchase affect business cash flow?
The right answer can be very different for two businesses buying exactly the same model.
Sole Trader vs Limited Company
Your business structure makes a major difference to the tax treatment.
Sole Traders
A sole trader and their business are legally the same person for tax purposes.
If you buy a car personally and use it for business, you have two main approaches to claiming vehicle costs:
- Simplified mileage expenses
- Actual costs and capital allowances
You cannot generally switch between the two methods for the same vehicle once you have started using the simplified mileage method.
Simplified Mileage Rates for 2026/27
For the 2026/27 tax year, the simplified mileage rate for cars and goods vehicles is:
Business mileage – First 10,000 miles
Rate – 55p per mile
Business mileage – Over 10,000 miles
Rate – 25p per mile
The first 10,000-mile rate increased from 45p to 55p from 6 April 2026.
For example, if you drive 12,000 business miles in 2026/27:
- 10,000 × 55p = £5,500
- 2,000 × 25p = £500
Total mileage deduction = £6,000
The simplified rate is intended to cover the vehicle’s running costs, including fuel, servicing, repairs, insurance and depreciation.
You can still claim certain additional business travel costs, such as qualifying parking expenses.
Actual Costs and Capital Allowances
Alternatively, you can calculate the actual business cost of running the vehicle.
This can include an appropriate business proportion of:
- Fuel or charging costs
- Insurance
- Repairs and servicing
- Vehicle tax
- Finance interest
- Other qualifying running costs
You may also be able to claim capital allowances on the vehicle.
If the car is used partly for private purposes, a sole trader generally needs to restrict the claim to the appropriate business use.
The most tax-efficient method depends heavily on the vehicle’s cost, emissions, business mileage and percentage of business use.
Limited Companies: Buying a Company Car
If a limited company buys a car, the vehicle belongs to the company.
The company may be able to claim:
- Capital allowances
- Insurance
- Repairs and servicing
- Maintenance
- Business fuel or charging costs
- Other qualifying running expenses
These costs can reduce the company’s taxable profits, subject to the normal rules.
However, there is an important consideration:
Benefit in Kind (BIK)
If a company car is made available for an employee or director’s private use, including commuting, a taxable BIK will normally arise. Proving to HMRC that a car is not available for private use is a difficult task requiring detailed record keeping.
The employee/director pays Income Tax on the taxable benefit, while the company normally pays employer National Insurance on the benefit.
The BIK calculation is broadly based on:
Car’s taxable list price × appropriate BIK percentage
The appropriate percentage depends primarily on CO₂ emissions and, for qualifying plug-in hybrids, electric range. For example the BIK rate for a fully electric car for 2026/27 is 4% rising to 37% for a vehicle with emissions of 155g/km and above.
What About Company-Car Fuel?
This is an area where careful planning is important.
If your company pays for fuel used for private journies in a company car, a separate fuel benefit can arise.
For 2026/27, the company-car fuel benefit multiplier is £29,200
The fuel benefit is calculated by multiplying this figure by the appropriate company-car percentage.
For example, a car with a 4% BIK percentage would have a fuel benefit of:
£29,200 × 4% = £1,168
The employee/director would then pay Income Tax on that additional benefit.
This is why paying for private fuel through the company is not automatically tax-efficient.
For a low-emission or electric car, it may be worth comparing the cost of reimbursing private fuel personally with the additional fuel-benefit tax.
Electric Cars
Electric vehicles remain particularly attractive for many company-car users.
There are two separate tax considerations:
1. Capital Allowances
A qualifying new and unused electric car can qualify for 100% first-year capital allowances where the relevant conditions are met. The current first-year allowance is available for qualifying purchases before April 2027.
2. Benefit in Kind
The BIK rate for a fully electric company car is 4% for 2026/27.
Although this is higher than the 3% rate for 2025/26, it remains substantially below the rates that can apply to many petrol and diesel cars.
This combination can make an electric company car particularly attractive for directors and employees who would otherwise purchase a relatively expensive petrol or diesel vehicle personally.
What about VAT?
VAT is often more restrictive than the income-tax or Corporation Tax treatment. VAT on the purchase of an ordinary passenger car is generally not recoverable unless specific conditions are met. For a leased car, 50% of the VAT on the lease is normally blocked where private use is involved. VAT on repairs and maintenance can generally be recovered where the vehicle is used for business purposes, subject to the normal VAT rules.
What about Capital Allowances?
The rate of capital allowances depends on the car’s CO₂ emissions and whether it is a qualifying new and unused electric vehicle.
Final Thoughts
Buying a car through your business can be tax-efficient, but it is not automatically the best option.
The decision is particularly influenced by:
- CO₂ emissions
- Electric vs petrol/diesel
- Business mileage
- Private use
- BIK
- Capital allowances
- VAT
- Purchase vs lease
- The company’s Corporation Tax position
- The vehicle’s expected depreciation and resale value
For limited companies, electric cars can still offer a compelling combination of relatively low BIK and generous capital allowances.
For sole traders, the 2026/27 increase in the simplified mileage rate to 55p for the first 10,000 business miles also makes the mileage method worth revisiting if you have previously compared it with actual costs.
The most important point is this:
Don’t choose the vehicle or purchase method based on the tax deduction alone. Look at the total after-tax cost to both you and your business.
Your next car: make the numbers work for you and your business
Before committing to a purchase or lease, it pays to compare the full cost of your options. The right choice should fit your driving needs, personal finances and business cash flow.
With offices across the North West and as part of the Sumer Group, Cowgills combines local support with access to a wider network of specialist expertise. Whether you’re a sole trader or a company director, our advisers can help you compare business and personal ownership, buying versus leasing, and electric versus petrol or diesel. We’ll consider tax relief, VAT, any Benefits in Kind and ongoing costs to help you understand what each option could mean in practice.
Get in touch with your local Cowgills team to discuss the most suitable approach for you and your business.
