Benefits in Kind (P11D) Calculator

HMRC taxes workplace benefits by converting them into a cash equivalent value, which is then taxed at your marginal income tax rate. Each benefit type has its own valuation method defined in the Income Tax (Earnings and Pensions) Act 2003. Your employer reports these values annually on form P11D, and HMRC adjusts your tax code to collect the additional tax owed through PAYE.

Company car benefit is calculated by multiplying the car's P11D price (list price plus accessories, minus capital contributions up to £5,000) by the appropriate percentage based on CO2 emissions. For 2026/27, zero-emission vehicles attract a 2% rate, rising in 1% increments through to 37% for the highest polluters. The resulting cash equivalent is added to your taxable income.

Private medical insurance benefit equals the cost your employer pays for the policy premium. Accommodation benefit uses the annual value or, if the property cost exceeds £75,000, adds a supplementary charge calculated as the excess multiplied by the official rate of interest (currently 2.25%).

UK Benefits in Kind (BIK) 2026/27. Non-cash perks from employer treated as taxable income. Most common: company car (BIK based on CO2 emissions × list price); private medical insurance (taxable at full premium cost); accommodation (taxable at rental value); loans over £10,000 (taxable interest difference); gym membership; mobile phone (one mobile per employee tax-free; second mobile taxable). Reported on P11D form by 6 July following tax year.

Company car tax — the major BIK. Calculate: list price × CO2 emission percentage. EV (zero emissions): 3% 2025/26, 4% 2026/27, 5% 2027/28, rising 1pp/year. Petrol/diesel: 14-37% scale (highest CO2). Sample £40k EV: £40k × 3% = £1,200 BIK; tax 20%/40%/45% = £240/£480/£540 annual cost. Sample £40k petrol (180g/km): £40k × 30% = £12,000 BIK; tax £2,400/£4,800/£5,400. EV cost ~10× cheaper for company car.

Salary sacrifice + benefits in kind. Salary sacrifice for: pension, cycle-to-work, EV company car — saves both income tax AND NI. Sample £40k earner sacrifices £6,000 into pension: saves £1,200 income tax + £480 NI = £1,680 effective cost £4,320. Cycle-to-work limited to £1,000 (some schemes £3,500). EV salary sacrifice particularly attractive — combined with low BIK rates, often 30-50% saving for higher-rate taxpayers. Check employer scheme.

Tax-free benefits — UK list. Workplace pension contributions (employer); one mobile phone; £6/week working-from-home allowance; cycle-to-work scheme bike + accessories; some training and education; eye tests for VDU users; flu vaccinations; staff entertainment up to £150/head/year (annual events); long service awards over 20 years (£50/year length up to £1,000); workplace nursery (limited); car parking at workplace; staff suggestion scheme awards (limited). Most other employer-paid benefits ARE taxable.

BIK reporting — P11D, P11D(b), Section 336. Employer files P11D for each employee receiving BIK; P11D(b) summary by 6 July following tax year. PAYE tax code adjusts following year to collect tax (or pay refund). Section 336 (post-2026): payroll PAYE collection of BIK in real time, ending lag-year tax adjustments. Employee can claim relief on business mileage exceeding HMRC rates (AMAP 45p/25p). Self Assessment usually triggered if BIK significant — even via payroll only, P11D records BIK for HMRC records.