Benefit in Kind tax is the income tax you pay on non-cash perks your employer gives you, such as a company car, private medical insurance, or a cheap loan. HMRC treats those perks as part of your taxable pay because they save you spending your own after-tax money on things you would otherwise buy yourself. The amount of tax depends on the cash value of the benefit and the income tax band you sit in, so the same perk costs a higher-rate taxpayer twice what it costs someone on the basic rate.
What Counts as a Benefit in Kind
A benefit in kind is any non-cash advantage you get because of your job. The common ones are:
- A company car you can drive outside work hours.
- Private medical insurance paid for by your employer.
- A beneficial loan — an interest-free or low-interest loan from your employer, unless the total balance stays under £10,000 for the whole tax year.1HM Revenue & Customs. Beneficial Loan Arrangements (480: Chapter 17)
- A company van with private use, which carries a flat charge of £4,170 for 2026/27, plus £798 if your employer pays for private fuel.2GOV.UK. Van Benefit Charge and Fuel Benefit Charges for Cars and Vans for Tax Year 2026 to 2027
- Living accommodation provided by your employer, unless it’s genuinely necessary for the job, provided for your security, or customary in your line of work.
The underlying principle is simple. If the perk gives you something of personal value you would otherwise pay for yourself, HMRC wants to tax it.
How the Tax Is Worked Out
For most benefits, the taxable value is what it cost your employer to provide the perk, minus anything you paid toward it. If your employer spends £5,000 and you contribute £500, you’re taxed on £4,500. That net figure is added to your taxable income for the year, and you pay tax on it at whatever rate applies to your top slice of income.
Company Cars
Company cars use a different formula, set out in the Income Tax (Earnings and Pensions) Act 2003. Take the car’s list price (including accessories), then multiply by a percentage set by the car’s CO2 emissions.3Legislation.gov.uk. Income Tax (Earnings and Pensions) Act 2003 – Section 121 A capital contribution you made toward the car reduces the price before the percentage is applied, and payments you make for private use reduce the final figure.
A worked example: a £30,000 car at a 25% BIK rate produces a taxable benefit of £7,500. A basic-rate taxpayer (20%) owes £1,500. A higher-rate taxpayer (40%) owes £3,000. The percentage is where the real variation lies, and it’s driven almost entirely by emissions.
Beneficial Loans
Where your employer lends you money at below-market interest, the taxable benefit is the difference between interest at HMRC’s official rate and whatever you actually paid. The official rate was set at 3.75% from April 2025.4Legislation.gov.uk. The Taxes (Interest Rate) (Amendment) Regulations 2025 No charge arises at all if the total outstanding balance on all employer loans stays below £10,000 for the whole tax year.1HM Revenue & Customs. Beneficial Loan Arrangements (480: Chapter 17)
Company Car Rates for 2026/27
From April 2026, the BIK percentage for company cars rose by one point across the board. Pure electric cars now sit at 4%, up from 3% the previous year.5GOV.UK. Work Out the Appropriate Percentage for Company Car Benefits (480: Appendix 2) That’s still far below petrol or diesel equivalents, which is the whole point of the structure.
Selected rates for 2026/27:
- 0 g/km (pure electric): 4%
- 1–50 g/km with 130+ mile electric range: 4%
- 1–50 g/km with 70–129 mile electric range: 7%
- 1–50 g/km with 40–69 mile electric range: 10%
- 51–54 g/km: 17%
- 100–104 g/km: 26%
- 130–134 g/km: 32%
- 170+ g/km: 37% (maximum)
Diesel cars that don’t meet the RDE2 emissions standard get an extra 4%, capped so the total never exceeds 37%.5GOV.UK. Work Out the Appropriate Percentage for Company Car Benefits (480: Appendix 2) The gap is stark. An electric car with a £40,000 list price gives you a £1,600 taxable benefit. A 170 g/km petrol car at the same price gives you £14,800.
Perks That Aren’t Taxed
Not every workplace perk triggers a charge. Several exemptions exist, but each carries conditions that are easy to breach by accident.
Trivial Benefits
A benefit escapes tax if it costs £50 or less, isn’t cash or a cash voucher, isn’t a reward for performance, and isn’t written into your contract.6GOV.UK. Tax on Trivial Benefits Birthday flowers, a box of chocolates, a small gift — that sort of thing. The conditions are cumulative. Fail any one and the whole amount becomes taxable. A £45 gift card fails, because cash vouchers never qualify.
Annual Events
Employers can hold a Christmas party or similar function tax-free if the cost per head stays at or below £150 and the event is open to all employees (or all employees at a location).7GOV.UK. Expenses and Benefits: Social Functions and Parties The £150 is a threshold, not an allowance. Go £1 over and the whole cost becomes taxable, not just the excess.
Work-Related Training
Courses that improve your ability to do your current job, or a related role with the same employer, are fully exempt. The exemption covers fees, related travel, and any resulting qualification. It doesn’t cover training that’s really entertainment, a reward, or a recruitment incentive unrelated to job-relevant skills.8GOV.UK. Work-Related Training (480: Appendix 9)
Other Common Exemptions
Employer pension contributions, the cycle-to-work scheme, subsidised workplace meals available to all staff, and recommended medical treatment up to £500 a year also fall outside the BIK charge. Workplace parking at your normal place of work is exempt regardless of value.
What Salary Sacrifice Does and Doesn’t Save
Salary sacrifice, where you give up some cash pay in return for a benefit, used to be a reliable way to reduce tax. Since April 2017 most of that advantage is gone. Under the optional remuneration arrangement (OpRA) rules, the taxable amount is the higher of either the salary you gave up or the normal BIK value.9GOV.UK. Optional Remuneration Arrangements
A short list of benefits is protected and still delivers genuine savings through salary sacrifice:
- Employer pension contributions.
- Ultra-low emission company cars (under 75 g/km).
- Cycle-to-work schemes.
- Childcare vouchers, for employees already in schemes before October 2018.
For everything else, salary sacrifice no longer changes the tax outcome.
How You Actually Pay the Tax
If your employer doesn’t payroll your benefits, HMRC collects the tax by adjusting your PAYE code. After your employer sends in the P11D reporting your benefits, HMRC changes your code so a bit more tax comes out of each payslip over the following year. There’s no separate bill.10GOV.UK. Tax Employees’ Benefits and Expenses Through Your Payroll
Where your employer already payrolls benefits voluntarily, the taxable value is added to your pay each month and taxed in real time. Your payslip shows the benefit and the tax against it, which is easier to follow than a code adjustment.
What you personally owe comes down to your tax band. A £3,000 benefit costs a 20% taxpayer £600, a 40% taxpayer £1,200, and a 45% taxpayer £1,350. It’s worth checking this before accepting a benefit package, because the same perk can cost two colleagues very different amounts.
Mandatory Payrolling From April 2027
From April 2027, employers will have to report most benefits through payroll software in real time instead of filing P11D forms after the tax year ends. The change was originally set for April 2026 and was pushed back to give employers and software providers more time.11GOV.UK. Technical Note: Mandating the Reporting of Benefits in Kind and Expenses Through Payroll Software – An Update
For you as an employee, it means the tax on your benefits will come out of each payslip as you go, rather than being clawed back through a tax code adjustment the following year. Two benefits stay outside mandatory payrolling at the start: employment-related loans and living accommodation. Employers can choose to payroll those voluntarily, but P11D forms will still be accepted for them.