Business Car Finance Calculator (UK)

Benefit-in-kind (BIK) tax on company cars

If a company car is available for private use, the driver usually pays benefit-in-kind tax on its value. BIK is based on the car's list price and its CO2 emissions, and it can be substantial.

The BIK charge is a percentage of the car's P11D value (list price plus delivery and options), with the percentage set by CO2 emissions — low-emission and electric cars attract a much lower percentage than petrol or diesel. The driver pays income tax on that amount; the employer pays National Insurance on it. A pricey, high-emissions company car can trigger thousands of pounds a year in BIK, which often makes personal finance cheaper overall.

Business vs personal car finance

Business finance can be cheaper after tax and VAT, but personal finance is simpler and avoids BIK issues. The right choice depends on usage, VAT status and the car's emissions.

If the car is used wholly and genuinely for business, the business route often wins on tax. If there's meaningful private use, BIK tax can erase the saving — and a personal deal is usually cleaner and avoids the admin. Work out both and compare the true after-tax cost before deciding.

Financing vans vs cars through a business

Vans are treated differently from cars for VAT and tax — restricted-use commercial vehicles can often reclaim VAT in full, unlike cars. The distinction matters and can change the maths significantly.

If you're financing a van (or a qualifying commercial vehicle), VAT recovery is generally more generous than for cars, and capital allowances are typically more favourable. The boundary between a car and a van can be subtle (double-cab pickups, combi vans), so check the vehicle's classification with your accountant. See the van finance calculator for van-specific figures.

Capital allowances and the Annual Investment Allowance

When a business buys (or HP-finances) a car, capital allowances let it write down the cost against taxable profits — and low-emission cars can qualify for 100% first-year relief, while the Annual Investment Allowance (AIA) covers many purchases up to a yearly cap. Leased cars are treated differently (the rental is usually deductible as an expense instead).

The mechanism depends on the car's CO2 emissions. Low-emission cars (broadly, fully electric or under set CO2 thresholds) can qualify for a First Year Allowance of 100%, meaning the whole purchase price is deducted from profits in year one. Higher-emission cars go into the main rate pool (18% a year, reducing balance) or the special rate pool (6% a year) and are written down slowly over many years. The AIA — currently £1 million a year — lets most businesses fully deduct qualifying plant and machinery, but cars are generally excluded from the AIA and rely on the CO2-based capital allowances instead.

The practical effect: a £30,000 electric car bought through a company can cut that year's corporation-tax bill by £4,500 (at 19% corporation tax), while a £30,000 diesel might deliver only a few hundred pounds of relief in year one. That gap often flips the maths in favour of electric even before fuel savings. Confirm the current rates and thresholds with an accountant, as HMRC updates the CO2 bands regularly.

VAT on contract purchase vs contract hire

VAT treatment is the biggest difference between business contract hire (where VAT on rentals is often partly reclaimable) and business contract purchase or HP (where VAT recovery on cars is generally blocked). It can shift the after-tax monthly by hundreds of pounds.

On business contract hire and leasing, a VAT-registered business can usually reclaim 50% of the VAT on the monthly rental if the car is available for any private use, or 100% if it's used wholly for business. That 50% reclaim effectively cuts the monthly cost noticeably on a VAT-inclusive quote. On business contract purchase and HP, VAT recovery on the car itself is generally blocked (except for special-purpose vehicles like taxis or driving-school cars), so the business pays the VAT and can't claw it back.

This is why the calculator above offers an ex-VAT and inc-VAT view: for a VAT-registered business on contract hire, the ex-VAT monthly is the one that matters; for a non-VAT business or a contract purchase, you're paying the VAT-inclusive figure. Switch the toggle to see both, and compare on the figure that matches your VAT status.

After-tax cost: a worked example

The true cost of business car finance is the monthly plus the BIK the driver pays and the VAT you can't reclaim — only counting all three tells you whether business or personal finance wins. Here's how the maths stacks up.

Take a £30,000 average-petrol car on business contract hire at £350 a month inc-VAT for a VAT-registered company with 20% private use. The business reclaims 50% of the VAT (saving roughly £29 a month), so the net monthly is about £321. But the driver faces BIK of around £7,500 a year on a £30,000 P11D at ~25% — that's £1,500 a year in income tax for a basic-rate payer, or about £125 a month, and the employer pays Class 1A National Insurance on top. The after-tax monthly is nearer £450 than the headline £350.

Run the same car on a personal deal and there's no BIK and no VAT reclaim, but the driver pays the full £350 (if they're not VAT-registered) out of post-tax income. For a high-emissions car with meaningful private use, personal finance is often cheaper once BIK is counted; for a low-emission or electric car used mostly for business, business contract hire usually wins. The APR and true-cost calculator helps you compare the headline finance cost before the tax layer goes on top.

Common business car finance mistakes

The costly mistakes are ignoring BIK on private use, forgetting the 50% VAT block on leased cars, and assuming the cheapest monthly is the cheapest after tax. Each can flip a 'saving' into a loss.

• Ignoring BIK on private use: commuting counts as private use, so even a 'business' car usually triggers BIK. A high-emissions car can cost the driver thousands a year.
• Forgetting the 50% VAT block: on a leased car with any private use, only half the VAT is reclaimable. Don't budget the full 100% reclaim.
• Comparing on the headline monthly: the ex-VAT monthly looks cheaper, but only a VAT-registered business on contract hire sees it. Compare on the after-tax total cost.
• Misclassifying the vehicle: a double-cab pickup or combi van may be taxed as a car, not a van, which changes both VAT and BIK. Confirm the classification with HMRC's definitions.
• Choosing HP for a low-emission car without checking FYA: buying (or HP) a qualifying low-emission car can unlock 100% First Year Allowance that leasing can't — flip the structure to capture it.