Buying a car through limited company or personally

Should I Buy a Car Through My Limited Company, Sole Trader Business, or Personally?

Choosing how to buy a car as a business owner is more than just a financial decision. It affects how much tax you’ll pay, what benefits you receive, and even how much admin you’ll deal with each year.

This guide explains everything clearly—whether you’re a limited company director, a sole trader, or simply thinking of using your personal car for business and charging mileage.

Let’s explore the best approach in 2025 and what each option really means for your pocket.

Understand Your Business Structure First

Before anything else, identify how your business is set up. This alone changes how tax applies to the car.

Buying as a Limited Company

When your company buys the car, it owns the vehicle—not you. The company claims capital allowances and deducts running costs, but if you use the car personally, HMRC sees that as a Benefit in Kind (BIK).

You’ll pay personal income tax based on a percentage of the car’s list price, and your company pays Class 1A National Insurance on that benefit.

You must also submit annual P11D forms, which adds paperwork.

This route suits electric cars well, thanks to generous allowances and low BIK rates. However, petrol and diesel cars often bring high BIK costs.

What Is BIK?

BIK stands for Benefit in Kind. HMRC treats the personal use of a company-owned asset—like a car—as extra income. They see it as a non-cash reward, just like salary. So, they tax it.

If your company gives you access to a car, even if only part-time for personal use, HMRC assigns a notional cash value to that benefit. You pay income tax on it through your Self Assessment return (or through PAYE if you’re an employee), and your company pays 13.8% Class 1A National Insurance on the same value.

How Is BIK Calculated?

HMRC uses a fixed formula:

BIK value = List Price of the car × BIK % based on CO₂ emissions and fuel type

Let’s break that down:

• The list price is the car’s official price when new—including VAT, delivery, and optional extras—not the amount your company paid.
• The BIK % is a sliding scale set by HMRC. It depends mainly on the car’s CO₂ emissions, fuel type, and (for hybrids) electric-only range.
• For pure electric cars, the BIK rate in 2025/26 is only 3%. That’s incredibly low.
• For diesel or petrol cars, the BIK rate can go as high as 37%, especially if emissions exceed 150g/km.

Example: Comparing Electric and Petrol

Let’s say your company buys a car with a £35,000 list price:

• Electric car (3% BIK)
  £35,000 × 3% = £1,050 taxable benefit
  You pay income tax on £1,050 (e.g., £420 if you’re a 40% taxpayer).
  The company also pays £145 in Class 1A NIC (13.8%).
• Diesel car (37% BIK)
  £35,000 × 37% = £12,950 taxable benefit
  You pay tax on £12,950 (e.g., £5,180 at 40%).
  The company pays £1,787 in Class 1A NIC.

The difference is massive, even though the cars might cost the same to buy or lease. Petrol and diesel cars attract a heavier tax burden simply because of their higher emissions.

Diesel Supplement Still Applies

If the car runs on diesel and doesn’t meet RDE2 emissions standards, an extra 4% supplement is added to its BIK rate. That pushes some cars even higher—towards the 37% cap.

Buying as a Sole Trader

Sole traders don’t face BIK charges because you and your business are one legal entity. You claim tax relief based on how much of the car is used for business.

For example, if 80% of your mileage is work-related, you can deduct 80% of the car’s capital allowances and running expenses. You must keep solid mileage logs to prove the split.

When you sell the car, HMRC may apply a balancing charge or allowance based on how much tax relief you originally claimed.

Buying the Car Personally

In this option, you buy the car in your name and then claim HMRC’s mileage allowance when using it for business.

The approved tax-free rates are:

• 45p per mile for the first 10,000 miles
• 25p per mile after 10,000 miles

You won’t pay any tax or National Insurance on this if your employer (or your business) pays no more than the approved rate.

This route keeps things simple. It avoids BIK, P11D reporting, and ties no asset to your company accounts.

Consider the Type of Car You Plan to Buy

What car you choose makes a big difference—especially in 2025, when the government’s tax focus clearly favours cleaner vehicles.

Petrol or Diesel Cars

Petrol and diesel vehicles carry the heaviest BIK burden. The more CO₂ the car emits, the higher the percentage used to calculate your benefit.

In some cases, the BIK rate hits 37% of the car’s list price. That can cost thousands every year.

Capital allowances are slower too. You might only claim 6% or 18% per year, depending on the emissions. If you want to reduce tax quickly, petrol and diesel cars won’t help.

VAT is also not recoverable unless the car is used 100% for business, which is rare.

Plug-in Hybrid Cars

Hybrids perform better than petrol or diesel models. The BIK rate ranges between 9% and 21%, depending on how far the car can travel on electricity.

Still, hybrids don’t qualify for the 100% first-year allowance unless emissions are under 50g/km. That means your business recovers the cost over time rather than upfront.

Pure Electric Cars

Electric vehicles offer the strongest tax benefits in 2025:

• 3% BIK rate for 2025/26
• 100% first-year allowance for companies and sole traders buying new EVs
• No road tax (VED) until April 2025
• 7p per mile reimbursement allowed tax-free by HMRC

These incentives make EVs the most tax-efficient choice if you or your business plan to buy a new car in 2025.

Explore Each Option Based on Your Circumstances

1. Limited Company Purchase

This path works best if:

• You plan to buy a brand-new electric car
• You drive regularly for work
• Your company has enough profit to benefit from capital allowances

Tax savings are high with EVs, while BIK remains low. However, petrol and diesel cars usually result in high BIK and slow tax relief.

2. Sole Trader Purchase

This method suits:

• Sole traders using the car mostly for business
• Those who want to avoid BIK
• Buyers of electric cars who want immediate tax relief

You’ll need to maintain clear mileage records, but you’ll control how much of the car you claim for based on real business use.

3. Personal Purchase + Mileage Claims

Choose this if:

• You prefer simplicity
• You drive under 10,000 business miles per year
• You want to avoid company tax and admin

This option keeps the car in your name and lets you claim mileage tax-free. It avoids BIK and removes the need for capital allowances or vehicle reporting.

Example to Illustrate the Impact

Let’s say you buy a brand-new electric car for £35,000 in April 2025. You drive 8,000 business miles and 2,000 for personal use.

• If your limited company buys the car:
  You can claim 100% first-year capital allowance, saving up to £8,750 in corporation tax. You pay roughly £420 in personal income tax due to the BIK, and your company pays £145 in Class 1A NIC.
• If you’re a sole trader:
  You can claim 80% of the £8,750 allowance based on your business use. That gives you £7,000 tax relief. No BIK applies.
• If you buy it personally:
  You charge the company 45p per mile for 8,000 miles. That gives you £3,600 tax-free, without triggering any benefit charge or tax paperwork.

Other Key Factors to Think About

Insurance Costs

Business-use insurance often costs more. A company-owned vehicle usually needs a different policy than a personally owned one. If you buy the car personally, make sure your insurer covers business journeys.

Cash Flow Planning

Buying a car through the company may tie up business funds. Leasing or using personal funds could ease pressure on the company’s working capital.

Long-Term Use and Resale

If your company owns the car, selling it later could complicate accounting and tax. Personally owned cars stay out of business records and give you flexibility when you decide to sell or change cars.

Branding and Image

A company car, especially an EV, helps present a modern and eco-conscious brand to your clients. That could influence your decision if client perception matters.

Final Recommendation for 2025

If you plan to drive regularly and want a new electric car, buying it through your limited company or sole trader business gives the strongest tax advantages. You’ll benefit from low BIK, strong capital allowances, and a green brand image.

However, if you drive fewer than 10,000 business miles per year, want to avoid admin, and prefer to keep control of your vehicle, buying the car personally and charging mileage remains the smartest and cleanest route.

Petrol and diesel vehicles continue to lose favour in the tax system. Their high BIK and limited allowances make them unattractive for most business owners.

Conclusion

There’s no one-size-fits-all answer. You must weigh mileage, vehicle type, tax impact, and practical needs.

Electric cars lead the way under current tax rules. If you or your business can afford the upfront cost, buying a new EV through your limited company or sole trader setup makes sense. But if your usage is light, or you prefer freedom and simplicity, buying the car personally and claiming mileage allowance often delivers the best result.

Take time to compare the numbers for your situation. A smart car choice today could save you thousands in the next few years.

📞 Written by etaxfiling.co.uk

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