Company Car vs Car Allowance in the UK: Which Is the Better Deal?

When your employer offers you a choice between a company car and a car allowance, the decision can be worth thousands of pounds a year. Get it right and you save significantly. Get it wrong and you could be overpaying every single month.

The answer used to be simple: most people were better off with a car allowance. But the introduction of ultra-low BIK rates for electric vehicles has completely changed the calculation. In 2026, an EV company car is often the cheapest option by a large margin.

1. How Company Car BIK Tax Works

With a company car, you don't pay for the car directly. Your employer provides it, and you pay Benefit in Kind (BIK) tax based on the car's P11D value and CO2 emissions. The formula is:

Annual BIK tax = P11D value × BIK rate × your income tax rate

For a zero-emission EV, the BIK rate is just 2%. For a petrol car emitting 130g/km, it's around 30%. For a large diesel SUV, it can reach 37%. This means two cars with the same price tag can have vastly different tax costs.

One advantage of a company car: you don't pay employee NI on the BIK — only income tax. Your employer pays Class 1A NI on the benefit, but that doesn't come out of your pocket.

2. How Car Allowance Tax Works

A car allowance is simply extra cash added to your salary. It's taxed exactly like income:

• Income tax: 20% (basic rate) or 40% (higher rate)
• Employee National Insurance: 8% (or 2% above the Upper Earnings Limit)

A £500/month car allowance (£6,000/year) for a basic-rate taxpayer would be taxed at roughly 28% (20% income tax + 8% NI), leaving you with about £4,320/year (£360/month) after tax.

From this net amount, you need to fund the car itself (purchase, PCP, or lease), plus insurance, road tax, servicing, maintenance, tyres, and breakdown cover. It adds up quickly.

3. How to Compare the Two Options

To make a fair comparison, you need to calculate the total cost of each option after tax:

1. Company car: Monthly BIK tax deducted from pay + any employee contribution required
2. Car allowance: Post-tax allowance received, minus all car running costs (finance, insurance, maintenance, fuel, road tax)

The company car usually includes everything except fuel. The car allowance requires you to fund all costs yourself from the taxed allowance.

4. When the Company Car Wins

The company car is usually the better choice when:

• You choose an EV or low-emission PHEV — At 2% BIK, an EV company car costs a fraction of funding a car from a taxed allowance
• You're a higher-rate taxpayer — The gap between 40% income tax on allowance vs 2% BIK on an EV is enormous
• You don't want to deal with insurance, servicing, and maintenance — Company cars typically cover everything
• Your employer offers a salary sacrifice scheme — This amplifies the savings further

5. When the Car Allowance Wins

The car allowance is usually better when:

• You'd choose a high-emission petrol or diesel — At 25–37% BIK, the company car tax is almost as much as the income tax on an allowance, but you get less choice
• You do very low mileage — You can buy a cheap, reliable used car and pocket most of the allowance
• You want flexibility — The car is yours regardless of job changes
• You already own a suitable car — Take the cash, keep your car, and claim business mileage on top
• You do high business mileage — The 45p/mile AMAP rate on your own car can be very lucrative

6. Mileage Claims: The Hidden Advantage of a Car Allowance

If you take a car allowance and use your own car for business journeys, you can claim HMRC's Approved Mileage Allowance Payments (AMAP):

These payments are tax-free. If you do 12,000 business miles per year, that's (10,000 × 45p) + (2,000 × 25p) = £5,000 in tax-free mileage payments on top of your car allowance.

If your employer pays less than the AMAP rate (or nothing), you can claim tax relief on the difference through your self-assessment tax return.

With a company car, you can only claim at HMRC's advisory fuel rates, which are much lower (e.g. 14p/mile for petrol 1,400cc–2,000cc, or 7p/mile for electric).

7. National Insurance: A Key Difference

This is often overlooked. With a company car, you pay no employee NI on the BIK. With a car allowance, you pay NI at 8% (or 2% above the UEL) on the full allowance amount.

For a £6,000/year car allowance, that's an extra £480/year in NI alone for a basic-rate taxpayer. This makes the company car slightly more attractive than it might appear from just comparing income tax and BIK rates.

Your employer also saves: they pay 15.05% employer NI on allowance cash, vs 15.05% Class 1A NI only on the BIK value of a company car. For a low-BIK EV, the employer's NI bill is dramatically lower.

8. Worked Examples at Different Salary Levels

Scenario 1: £35,000 salary, 20% taxpayer, £500/month allowance offered

Scenario 2: £60,000 salary, 40% taxpayer, £600/month allowance offered

The EV company car wins in both scenarios by a wide margin. The diesel company car is actually comparable to the car allowance — but with the allowance you get more flexibility and mileage claim potential.

Final Thoughts

In 2026, the decision is clearer than it's ever been. If you'd choose an electric company car, take the company car — the 2% BIK rate makes it almost unbeatable. If you'd choose a high-emission petrol or diesel, or if you do high business mileage in your own car, the car allowance combined with AMAP claims may be better.

Run the numbers for your specific situation. Factor in your tax rate, the car you'd choose, your business mileage, and whether you value convenience (company car) or flexibility (allowance).

Tax rates and BIK bands are subject to change. For specific tax advice, consult a qualified accountant or tax adviser.

Related reading: BIK Tax Explained | Salary Sacrifice Schemes | Mileage Claims Guide