Advanced Taxation (UK) · Income tax: income from employment

Benefits in Kind and the Official Rate of Interest

Updated 11 October 2026 · Fact-checked

Benefits in kind are non-cash perks taxed as employment income at a cash equivalent set by statute. Cars use list price × CO2 percentage, loans use average balance × the official rate (3.75%), and accommodation uses annual value plus an extra charge on cost above £75,000. Exempt benefits are not taxed.

Understand Benefits in Kind and the Official Rate of Interest

A benefit in kind is a reward given to an employee other than as cash pay. Examples are a company car, free fuel, a house to live in, or a cheap loan. The employee is taxed on the cash equivalent of the benefit. That figure is added to employment income and taxed at the employee's normal income tax rates.

The cash equivalent is not what the benefit cost the employer. Each benefit has its own statutory formula. For cars it depends on list price and CO2 emissions. For loans it depends on the official rate of interest. For living accommodation it depends on annual value and cost. You must learn which formula goes with which benefit.

The official rate of interest is the rate HMRC treats as a normal commercial rate. In the ATX-UK tax tables it is 3.75%. If an employer lends money at a lower rate, or interest free, the difference is a taxable benefit. It is also used in the additional charge on expensive living accommodation.

Exempt benefits are not taxed and are not reported on the P11D. Taxable benefits are reported on form P11D after the year end and also give rise to Class 1A NIC for the employer. Approved mileage allowances work differently: if the employer pays no more than 45p per mile for the first 10,000 business miles and 25p after that, nothing is taxable. Any excess is taxable, and a shortfall can be claimed as a deduction.

In the exam the ATX-UK tax tables give you the percentages, the fuel base figure, the van charges and the official rate. Your job is to pick the right rule, apply it to the dates in the scenario, and show clear workings.

Key rules to remember

Car benefit: (List price + accessories − capital contributions up to £5,000) × car benefit percentage × months available ÷ 12 − employee payments for private use; Capital contributions by the employee are capped at £5,000. Use the percentage from the tax tables. Employee payments for private use reduce the benefit. Apportion to the nearest month.
Car benefit percentage (from the tables): Electric (0g CO2) 3%; hybrid 1–50g by electric range: 130+ miles 3%, 70–129 miles 6%, 40–69 miles 9%, 30–39 miles 13%, under 30 miles 15%; 51–54g 16%; 55g 17%; The tables show the full scale. Above 55g the rate rises with emissions, up to a maximum. Check the table in the exam for the exact figure. A car with exactly 55g is 17%.
Car fuel benefit: £28,200 × car benefit percentage × months ÷ 12; Applies only if the employer pays for fuel used privately. It is nil if the employee reimburses all private fuel. Partial reimbursement gives no reduction.
Van benefit: £4,020 scale charge (plus £769 van fuel benefit if the employer pays private fuel), × months ÷ 12; Zero-emission vans have a 0% benefit. Taxable only if private use is more than home-to-work travel.
Beneficial loan, average method: (Opening balance + closing balance) ÷ 2 × 3.75% × months ÷ 12 − interest paid by employee; Exempt if the total of all loans from the employer is £10,000 or less at all times in the tax year. The strict (daily) method can be used if HMRC requires it or the taxpayer elects.
Living accommodation, basic charge: Annual value (or rent paid by the employer, if higher) − rent paid by employee; Apportion if provided for part of the year. No benefit arises where the accommodation is job-related, such as when it is necessary for the proper performance of the duties.
Living accommodation, additional charge: (Cost of providing the property − £75,000) × 3.75%; Applies where cost is over £75,000. Cost includes the purchase price plus improvements made before the start of the tax year. Not charged on job-related accommodation.

How to solve Benefits in Kind and the Official Rate of Interest questions

Use the same routine for any benefits question. It keeps your workings tidy and gets you the method marks even if one figure is wrong.

1List every benefit in the scenario and mark each as taxable or exempt before you calculate anything. Say why exempt items are exempt.
2Pin down the dates. Work out how many whole months each benefit was available in the tax year, to the nearest month.
3Pick the formula for each benefit: car, fuel, van, loan, accommodation or other. Pull the rates from the tax tables.
4Calculate each benefit separately with clear workings. Deduct employee contributions and payments only where the rules allow.
5Total the benefits and add them to employment income. State the effect on income tax at the employee's marginal rate if asked.
6Add the employer's Class 1A NIC and any advice if the requirement asks for it, such as whether a different benefit would save tax.
7Write a one-line conclusion that answers the exact requirement, for example the total taxable benefit for 2025/26.

Quickest way: Benefit-by-benefit table in the answer

When to use it: Use this when the scenario lists several benefits for one employee and time is short.

Write each benefit name on its own line in your answer, with the formula beside it.
Put in the numbers straight from the question and the tables. Do not re-derive percentages.
Adjust for months and contributions in the same line.
Underline each result and add them at the end.
Check the three common traps: the £5,000 contribution cap, fuel reimbursement, and the £10,000 loan exemption.

Common mistakes in Benefits in Kind and the Official Rate of Interest

Deducting the full capital contribution when calculating the car benefit.
Students assume any payment by the employee reduces list price without limit.
Fix: Cap the capital contribution at £5,000. Any private use payments are deducted separately from the final benefit.
Reducing the fuel benefit because the employee paid for some private fuel.
It feels fair to reduce it in proportion.
Fix: The fuel benefit is removed only if the employee reimburses all private fuel. Part payment gives no reduction.
Forgetting the additional charge on living accommodation costing more than £75,000.
Students stop after the annual value calculation.
Fix: Always check cost. If it is over £75,000, add (cost − £75,000) × 3.75% to the basic charge. Use cost plus earlier improvements.
Taxing a small loan.
Students apply the official rate without testing the threshold.
Fix: Check first whether total loans were £10,000 or less at all times in the year. If so, there is no taxable benefit.
Using 12 months when the benefit was available for only part of the year.
Students forget to read the dates or use days instead of months.
Fix: Count months to the nearest month, as the supplementary instructions require, and apply months ÷ 12 to the benefit.
Treating exempt benefits as taxable or leaving out the explanation.
Students are unsure which perks are exempt.
Fix: State the rule in a short phrase. For example, a mileage payment within the approved rates is not taxable, and a benefit available to all staff on the same basis may be exempt if it meets the relevant rule.

Worked examples

Example 1

Anna was provided with a petrol-electric hybrid company car from 6 July 2025 to 5 April 2026. It had a list price of £32,000 and CO2 emissions of 45 grams per kilometre, with an electric range of 80 miles. Anna made a capital contribution of £2,000 when the car was provided and paid £50 per month to the employer for private use. The employer paid for all fuel, including private fuel. Calculate the total taxable benefit for 2025/26 and the income tax cost if Anna is a higher rate taxpayer.

Show the solution

The car emits 1–50g, so use the electric range. 80 miles is in the 70–129 miles band, so the percentage is 6%.
Months available: 6 July 2025 to 5 April 2026 is 9 months.
Capital contribution is below the £5,000 cap, so deduct all of it: £32,000 − £2,000 = £30,000.
Car benefit before payments: £30,000 × 6% × 9/12 = £1,350.
Private use payments: £50 × 9 = £450. Car benefit = £1,350 − £450 = £900.
Fuel benefit: £28,200 × 6% × 9/12 = £1,269. No reimbursement, so no reduction.
Total benefit = £900 + £1,269 = £2,169.
Income tax at 40%: £2,169 × 40% = £868 (to the nearest £).

Answer: Taxable benefit £2,169 (car £900 and fuel £1,269). Additional income tax at 40% is £868.

Example 2

Ben's employer lent him £30,000 on 6 April 2025 at 1% interest. Ben repaid £10,000 on 6 October 2025, so £20,000 was outstanding on 5 April 2026. Ben paid £250 interest to the employer in the year. Ben also lives in a house bought by the employer on 1 June 2021 for £250,000 and provided to him from that date. £30,000 was spent on improvements in 2023. The annual value is £4,000. Ben pays no rent and the house is not job-related. Calculate the total taxable benefit for 2025/26 using the average method for the loan.

Show the solution

Loan: total loan is over £10,000, so the exemption does not apply.
Average balance = (£30,000 + £20,000) ÷ 2 = £25,000.
Benefit at the official rate: £25,000 × 3.75% = £937.50.
Deduct interest paid by Ben: £937.50 − £250 = £687.50, which is £688 to the nearest £.
Accommodation basic charge = annual value = £4,000.
Cost for the additional charge = £250,000 + £30,000 = £280,000. This is over £75,000.
Additional charge = (£280,000 − £75,000) × 3.75% = £205,000 × 3.75% = £7,687.50, which is £7,688 to the nearest £.
Total accommodation benefit = £4,000 + £7,688 = £11,688.
Total benefits = £688 + £11,688 = £12,376.

Answer: Loan benefit £688, accommodation benefit £11,688, total taxable benefits £12,376.

Exam tips

Open the tax tables before you start. The percentages, £28,200, the van figures and the 3.75% official rate are all given, so do not spend time memorising them.
Always show the formula and the months fraction in your workings. Marks go for the method as well as the answer.
Look for planning angles. A scenario that offers cash instead of a car, or asks you to compare an electric car with a petrol car, is testing the percentage scale and the effect on Class 1A NIC.
Spell out why an item is exempt or not taxable. A short reason earns the mark.
Round to the nearest £ at the end of each benefit, as the supplementary instructions allow, and keep your layout clean so the marker can follow it.

Practice questions from Income tax: income from employment

Benefits in Kind and the Official Rate of Interest: frequently asked questions

What is the official rate of interest in ATX-UK?

In the ATX-UK tax tables for June 2026 to June 2027 exams, the official rate is 3.75%. You use it to work out the benefit from cheap or interest-free loans. You also use it in the additional charge on living accommodation that cost more than £75,000.

Do I deduct employee payments from the car benefit?

Yes, for payments made for private use of the car. Capital contributions towards the cost are deducted from the list price, up to £5,000. Fuel payments do not reduce the car benefit.

What is the difference between P11D benefits and exempt benefits?

Taxable benefits are reported on the P11D and taxed as employment income, and the employer pays Class 1A NIC on them. Exempt benefits are not taxed. Examples are mileage payments within the approved rates and loans of £10,000 or less in total.

Do I use the average method or the strict method for loans?

The average method is the default. The strict method uses the daily balance. HMRC can require it, and the taxpayer can elect for it. In the exam, use the average method unless the question tells you otherwise.