A car allowance is a cash payment your employer adds to your salary instead of providing a company car. You use that money to buy, lease, or run your own vehicle for work. Unlike a company car, a car allowance is treated as income by HMRC and is subject to both income tax and National Insurance contributions.
This guide explains how car allowances work, how they are taxed, when they make sense, and when a different arrangement could leave you significantly better off.
Key Takeaways
- A car allowance is added to your gross salary and taxed as income through PAYE, including National Insurance contributions for both you and your employer.
- HMRC’s approved mileage rate for business travel is 45p per mile for the first 10,000 miles and 25p per mile beyond that.
- If your employer pays you below the approved mileage rate, you can claim Mileage Allowance Relief on the difference.
- A higher-rate taxpayer receiving a £6,000 car allowance takes home roughly £3,600 after income tax and National Insurance.
- Salary sacrifice is now a popular alternative that lets eligible employees drive a new electric car using pre-tax pay, with far lower tax costs than a conventional car allowance.
How Does a Car Allowance Work?
When your employer offers you a car allowance, they agree to pay a fixed sum on top of your basic salary each month or year. In return, you take responsibility for sourcing, insuring, maintaining, and running your own vehicle, including any costs associated with business travel.
The allowance amount typically reflects your job level, the mileage you are expected to cover, and your employer’s budget. It is paid through payroll alongside your regular salary and appears on your payslip as a separate line or is rolled into your total gross pay depending on your employer’s payroll setup.
You are then responsible for:
- Purchasing or leasing a suitable vehicle
- Insuring it for business use (standard personal insurance may not cover business journeys)
- Paying for fuel, servicing, and maintenance
- Handling VED (road tax) and MOT costs
In exchange, you claim business mileage from your employer separately, usually at an agreed rate per mile.
Is a Car Allowance Taxable?
Yes. A car allowance is fully taxable. HMRC treats it as earnings, so it is subject to income tax at your marginal rate and National Insurance contributions (NICs) for both you and your employer.
This is one of the most important things to understand before accepting a car allowance. A headline figure of £6,000 per year does not mean £6,000 in your pocket.
Example: after-tax value of a £6,000 car allowance
| Tax scenario | Annual allowance | After income tax (20% or 40%) | After employee NI (8%) | Approximate take-home |
|---|---|---|---|---|
| Basic-rate taxpayer | £6,000 | £4,800 | £4,320 | ~£4,320 |
| Higher-rate taxpayer | £6,000 | £3,600 | £3,120 | ~£3,120 |
Your employer also pays employer NI (15%) on the allowance, making it more expensive for them to offer than a salary sacrifice arrangement would be.
How Does Mileage Reimbursement Work?
Having a car allowance does not mean all your motoring costs are covered. When you drive for work, you claim mileage from your employer separately, at whatever rate they set. HMRC publishes approved mileage rates that determine the tax treatment:
HMRC Approved Mileage Allowance Payments (AMAPs):
| Vehicle type | First 10,000 business miles | Above 10,000 miles |
|---|---|---|
| Cars and vans | 45p per mile | 25p per mile |
| Motorcycles | 24p per mile | 24p per mile |
| Bicycles | 20p per mile | 20p per mile |
These rates apply for the 2026/27 tax year.
If your employer pays at or below the approved rate: The mileage payment is tax-free for you and the difference is not counted as a benefit.
If your employer pays above the approved rate: The excess is taxable as additional earnings and must be reported to HMRC.
If your employer pays below the approved rate: You can claim Mileage Allowance Relief (MAR) on the difference. For example, if your employer pays 30p per mile and you drive 8,000 business miles, you can claim tax relief on the 15p-per-mile shortfall (£1,200 total) at your marginal rate. A higher-rate taxpayer would reclaim £480.
Car Allowance vs Company Car: the Key Tax Difference
The tax treatment of a car allowance is fundamentally different from that of a company car.
A company car is a benefit in kind, meaning HMRC taxes you on a percentage of the car’s list price (P11D value). That percentage is your Benefit-in-Kind (BIK) rate, which depends on the car’s CO2 emissions.
For petrol and diesel cars, BIK rates can run to 25%—37% of the car’s list price, making conventional company cars expensive from a tax perspective.
For fully electric cars, the BIK rate is currently 4% (2026/27), rising gradually to 9% by 2029/30. This is the crucial difference that makes an electric company car, or a salary sacrifice scheme, dramatically more tax-efficient than a car allowance for many drivers.
Quick comparison for a higher-rate taxpayer:
| Arrangement | Scenario | Monthly cost to employee |
|---|---|---|
| Car allowance | £6,000/yr gross allowance | ~£260 take-home after tax |
| Company car (petrol) | £30,000 car at 30% BIK | ~£400/month in tax |
| Company car (electric) | £40,000 EV at 4% BIK | ~£53/month in tax |
When Does a Car Allowance Make Sense?
A car allowance suits some employees better than others. You are likely to benefit from a car allowance if:
You drive low mileage. With low business mileage, the employer savings on running costs and fuel are less valuable. Taking the cash allowance and running a reliable, modest car can be cost-effective.
You already own a suitable car. If you own your vehicle outright, the allowance supplements the running costs without requiring a new lease commitment.
You want flexibility. A car allowance lets you choose any vehicle, change it when you want, and keep any residual value. With a company car you have less control over what you drive and when you change it.
Your employer does not offer an electric option. Some fleets still focus on petrol or diesel, where the BIK tax makes the company car expensive. A car allowance can work out cheaper if you drive an efficient personal vehicle.
However, if your employer offers electric company cars or an EV salary sacrifice scheme, it is worth modelling the numbers carefully before defaulting to the cash allowance.
When Is a Car Allowance Not the Best Option?
For higher-mileage drivers, the running costs alone can erode the value of a car allowance quickly. Fuel, tyres, servicing, and depreciation on a car you own add up, and the nominal allowance may not cover the real cost of business driving.
More significantly, if your employer offers a salary sacrifice electric car scheme, taking the cash allowance is almost always the less tax-efficient choice.
Through salary sacrifice, you give up a portion of gross salary in exchange for a brand-new electric car lease. Because your sacrificed salary is taken before income tax and National Insurance are calculated, you pay less tax overall. The BIK charge on an electric car is only 4% in 2026/27, so the total cost is substantially lower than receiving and taxing a cash allowance.
To see how salary sacrifice could compare with your current or potential car allowance, see our full guide to salary sacrifice electric cars.
Key Questions to Ask Before Deciding
Before accepting a car allowance offer, work through these questions:
- What is my marginal tax rate? The higher your tax band, the more you lose to income tax and NI on the allowance.
- How many business miles do I drive each year? High mileage eats into the allowance quickly.
- Does my employer offer a salary sacrifice EV scheme? This could cost significantly less after tax.
- Does my employer offer a company car? If so, is it electric? A 4% BIK rate on an EV is hard to beat.
- Am I comfortable taking on the financial risk of owning or leasing a vehicle independently?
Frequently Asked Questions
Is a car allowance taxable in the UK? Yes. HMRC treats a car allowance as earnings, so it is subject to income tax at your marginal rate and National Insurance contributions for both you and your employer. A £6,000 allowance is worth around £3,100 to a higher-rate taxpayer after tax and NI deductions.
Can I claim mileage on top of my car allowance? Yes, if your employer also reimburses your business mileage separately. Payments up to HMRC’s approved mileage rates (45p per mile for the first 10,000 business miles) are tax-free. If your employer does not reimburse mileage, you can claim Mileage Allowance Relief from HMRC on your self-assessment return.
What is the approved mileage rate for cars in 2026? The HMRC approved mileage rate remains 45p per mile for the first 10,000 business miles in a tax year and 25p per mile for any mileage above that threshold, for the 2026/27 tax year.
Is salary sacrifice better than a car allowance? For many employees, yes. Salary sacrifice lets you sacrifice gross salary before tax in exchange for a new electric car lease. Because you are taxed on a lower salary and the BIK rate for electric cars is only 4% in 2026/27, the after-tax cost is typically far lower than receiving a taxable car allowance and running your own vehicle. See our salary sacrifice electric car guide to compare.