Company Car or Car Allowance: Which Saves You More Tax?

Company car or car allowance: which saves you more tax? The answer depends on your salary, the car's value, your driving habits, and how much you're offered in either case. For most UK employees, a car allowance is taxed as regular income, whilst a company car triggers Benefit-in-Kind (BIK) tax instead. One leaves more money in your pocket — but which one is yours?

The Core Difference: Two Paths to a Car

A company car is a vehicle owned by your employer that you're allowed to use for personal driving. You pay Benefit-in-Kind tax on its value, but you don't pay income tax on it.

A car allowance is cash added to your salary specifically to cover a car. It's taxed as ordinary income — income tax and National Insurance apply — so the amount you actually receive depends on your tax band.

That sounds simple in theory. In practice, the maths is where it gets interesting.

How BIK Tax Works on Company Cars

Benefit-in-Kind tax is calculated on the list price of the car when new, not what your company paid for it. The tax bill depends on:

The car's list price
Its CO₂ emissions (lower emissions = lower BIK percentage)
Your marginal tax rate (20% for basic rate, 40% for higher rate, 45% for additional rate)
Whether it's a first-time registration (cars registered after 1 April 2020 have different rules)

For a petrol car registered after April 2020, the BIK percentage starts at 11% of list price for cars emitting up to 50g CO₂/km. Electric vehicles and plug-in hybrids get preferential rates (currently 2–5%, though these are being increased in 2025–2026).

Worked example: You're offered a company car — a brand-new petrol saloon with a list price of £28,000 and CO₂ emissions of 130g CO₂/km. The BIK percentage for this band is 23%. That's £28,000 × 23% = £6,440 of taxable benefit per year. If you're a basic-rate taxpayer, that's £6,440 × 20% = £1,288 in tax per year, or £107/month. Your employer covers all maintenance, insurance, and road tax.

How Car Allowance Tax Works

A car allowance is straightforward: it's added to your gross salary and taxed like any other income.

If your employer offers you a £6,000/year car allowance, that £6,000 is added to your salary. On a basic-rate salary, you pay:

Income tax: £6,000 × 20% = £1,200
National Insurance: £6,000 × 8% = £480
Total deduction: £1,680

You take home £4,320 per year, or £360/month. You then need to buy, insure, and maintain the car yourself — and you can keep any leftover money if you find a cheaper option, or you cover the shortfall if you need something more expensive.

If you're a higher-rate taxpayer (earning over £50,270), the same £6,000 allowance costs you:

Income tax: £6,000 × 40% = £2,400
National Insurance: £6,000 × 2% = £120 (higher rate threshold)
Total deduction: £2,520

Take-home: £3,480 per year, or £290/month. The higher your tax band, the more expensive the allowance becomes.

Company Car vs Car Allowance: Direct Comparison

Let's compare these two options head-to-head. Imagine you're offered either (a) a company car or (b) a car allowance of £6,000/year.

The company car option (£28,000 petrol saloon, 23% BIK):

BIK tax: £1,288/year (basic rate)
Employer covers: fuel, insurance, servicing, road tax, breakdown cover
Your cost: £1,288/year
Your out-of-pocket cost for fuel and parking: ~£0 (unless employer caps fuel spend)

The car allowance option (£6,000/year, basic rate taxpayer):

Tax deduction: £1,680/year
Take-home: £4,320/year
You buy a car and cover: depreciation, insurance (£600–1,000/year), fuel (£1,200–1,500/year for moderate mileage), servicing (£300–500/year), road tax (£165/year), repairs

For an average car costing £12,000–15,000, depreciation over 5 years is roughly £150–200/month. Add insurance, fuel, and servicing, and you're spending £500–800/month out of pocket — far more than the £360 net allowance gives you.

This is where the company car wins for most employees. Even though you pay BIK tax, the employer covers all the running costs, which would cost you considerably more if you self-funded via an allowance.

But the picture changes if you're a higher-rate taxpayer. Your BIK tax doesn't increase, but your car allowance becomes much more expensive. The same £6,000 allowance now costs you £2,520 instead of £1,680. At that point, the company car looks even more attractive — assuming your employer offers one.

When a Car Allowance Makes Sense

There are scenarios where a car allowance beats a company car:

1. You don't need a fancy car. If your employer offers a company car you'd never choose yourself — perhaps a sensible saloon when you'd prefer a modest hatchback — a cash allowance lets you buy what you actually want. A £6,000 allowance could buy a used car outright or via a small personal loan, and how to calculate your effective tax rate helps you see the net value.

2. You drive very little. If you work from home 4 days a week and only need a car for occasional commutes, a company car (which you pay BIK tax on all year) may feel expensive compared to an allowance you can stretch across lower mileage. That said, you'd need to use the allowance very efficiently.

3. You want flexibility. A car allowance is yours — you can spend less on a basic car and keep the difference, or spend more and cover the gap from other income. A company car locks you into what the employer provides.

4. You value portability. If you change jobs, a car allowance negotiated into your salary is portable. A company car is tied to that employer. For freelancers or consultants who move between contracts, this matters.

Other Factors to Consider

Fuel and running costs. Company cars with fuel cards remove the weekly surprise at the pump. If your employer covers fuel, that's a genuine benefit you'd otherwise pay from your allowance. Some employers cap fuel spend (e.g., "we cover up to 8,000 business miles per year") — check the fine print.

Employer pension contributions. When comparing job offers, check whether the car is salary-sacrificed. If you sacrifice £6,000 from gross salary to get a company car, your pension contributions are calculated on a lower base, which affects your future pension pot. A car allowance doesn't reduce your pension calculation.

Mileage limits. Company cars often come with a mileage expectation (e.g., 12,000/year). Exceed it and you might get no mileage allowance, or a small reimbursement. An allowance has no mileage limit — you can drive as much or little as you want.

Personal tax code. The BIK value shows up on your tax code, which can affect benefits or credits you claim. Your accountant or HMRC can help adjust your tax code if needed.

Future changes. BIK rates for petrol cars are rising from 2025, and the preferential rate for electric vehicles is being phased down. If you're offered a company car now, check what the BIK % might be in 3–5 years.

For a detailed look at how your salary is taxed, check out our UK salary after-tax guide, or use our salary calculator to model both scenarios with your actual numbers.

Frequently Asked Questions

Can I negotiate a car allowance instead of a company car?
Yes. If your employer offers a company car and you'd prefer cash, ask. Employers know it's often cheaper for them to offer a car than to pay salary that covers both the allowance and the tax on it. Be prepared to explain why (mileage, car choice, flexibility) and propose a figure. Many employers are open to this, especially if you're in a negotiating position.

What happens to the BIK tax if I go on parental leave or unpaid leave?
You still owe BIK tax for any months you have the car available, even if you're not actively working. Some employers waive it during long unpaid leave — it's worth asking. Once you return, it resumes.

Do I pay BIK tax on a borrowed company car?
If you borrow a car occasionally for specific trips, it's usually not counted as a benefit. But if it's available to you for personal use throughout the year, BIK applies. The definition is "available for use" — even if you don't drive it every day, if you could use it, you're liable.

Is a car allowance better if I use my own car for work?
If you're claiming mileage expenses (22p per mile up to 10,000 miles, 25p thereafter, as of 2024), you're likely better off with your own car than a car allowance. Mileage expenses can reduce your taxable income, and you keep the allowance. But this only works if your employer allows employees to use personal vehicles for business mileage. Clarify with your employer.

What if I'm offered both — a company car AND an allowance?
Some employers offer a company car plus a fuel allowance or road tax allowance as a separate cash sum. Treat the car allowance part as regular income (subject to income tax and NI) and the car as a BIK benefit. The combination might actually be very generous — or it might just be them separating the components. Do the maths for your circumstances.

How does a company car affect my take-home pay compared to a salary increase?
A company car doesn't reduce your take-home pay in the way income tax does — you're not losing cash from your payslip. But it does affect your taxable income, which can matter for benefits, credits, or future salary thresholds. A salary increase is usually more flexible. See how salary increases actually work for more detail.

What about salary sacrifice schemes for cars?
Some employers offer salary-sacrifice car schemes where you sacrifice gross salary to "buy" a company car (which you don't actually own; it's a long-term lease). This can save you NI as well as income tax. However, it also reduces your pension base. Compare: BIK tax on a straight company car vs. the NI savings from salary sacrifice, minus the pension reduction.

Should I try to negotiate a higher salary instead of a car benefit?
Possibly. Run the numbers both ways. If you'd rather have complete flexibility and don't care about a car, push for salary. If a car is important and you'd buy one anyway, accepting a company car or modest allowance often costs you less tax than the salary equivalent. Our salary calculator lets you model both.

The Bottom Line

For most employees, a company car saves tax compared to a car allowance. You pay BIK tax (currently £1,000–2,500/year for a modest car) rather than income tax and NI on a cash allowance (which would cost £2,000–5,000+ depending on your tax band). Plus, the employer covers insurance and servicing.

But a car allowance wins if you don't need an expensive car, drive very little, or want complete flexibility in what you drive and how much you spend.

The deciding factor is almost always the numbers for your specific situation. If you're comparing job offers, plug both scenarios into our salary calculator — enter your gross salary with a company car and then with a car allowance, and see which gives you the highest take-home pay. Then factor in the non-tax stuff: do you like the car on offer? Will you actually drive it? Do you need the flexibility of an allowance?

Make the choice that works for your life, not just the spreadsheet. But definitely do the spreadsheet first.