UK P11D Benefit-in-Kind Calculator
Work out the taxable cash equivalent of every benefit on your P11D — company cars, fuel, vans, private medical insurance, beneficial loans and more. See your income tax bill and your employer's Class 1A NIC for 2026/27 in one place.
The rate your next £1 of income is taxed at. Scottish taxpayers: pick the closest band.
List price (P11D value) × BIK % based on CO2 emissions and fuel type.
Amount you pay your employer for the car (reduces BIK)
Taxed on the cost to the employer (the premium paid).
Mix and match to reflect everything on your P11D form. Class 1A NIC for 2026-27 is 15%.
Total BIK (Cash Equivalent)
£9,900
Goes on Section N of your P11D
Your Income Tax
£3,960
at 40% · £330.00/mo
Employer Class 1A NIC
£1,485
15% · due 22 July
Total Employer Cost
£11,385
Benefits + Class 1A NIC
| Benefit | Cash Equivalent | Your Tax | Class 1A NIC |
|---|---|---|---|
Company car BIK rate 29% | £8,700.00 | £3,480.00 | £1,305.00 |
Private medical insurance | £1,200.00 | £480.00 | £180.00 |
| Total | £9,900.00 | £3,960.00 | £1,485.00 |
What is a P11D?
A P11D is the form your employer files with HMRC each year to report taxable expenses and benefits-in-kind (BIKs) — non-cash perks like a company car, private health insurance, or an interest-free loan. Each benefit has a "cash equivalent" calculated under HMRC rules and added to your taxable income.
You pay income tax on the cash equivalent at your marginal rate, and your employer pays Class 1A National Insurance at 15% (2025/26 onwards). Both the P11D and P11D(b) are due by 6 July, and Class 1A NIC is payable by 22 July.
Key P11D Figures for 2026/27
- Company van flat benefit charge — £4,170 (zero for electric vans)
- Van fuel benefit charge — £798
- Car fuel benefit multiplier — £29,200 × BIK%
- Official Rate of Interest (beneficial loans) — 3.75%
- Beneficial loan exemption — loans under £10,000 are ignored
- Electric car BIK rate — 4% (rising to 5% in 2027/28)
- Class 1A NIC rate — 15%
Which Benefits Go on a P11D?
Common benefits reported on the P11D include:
- Company cars — list price × CO2-based BIK %
- Car or van fuel — flat multiplier × BIK %, or flat charge
- Private medical insurance — cost to employer
- Beneficial loans — notional interest at the Official Rate
- Living accommodation — annual value plus any excess cost above £75,000
- Gym memberships, gifts, childcare vouchers (when not payrolled)
- Assets transferred to an employee — market value or cost
From April 2026, many employers payroll benefits through PAYE in real time instead of reporting on a P11D. The cash equivalent is the same either way — this calculator shows what you'd owe on each benefit regardless of which reporting route your employer uses.
Who Pays What?
You (the employee) pay income tax at your marginal rate on the total cash equivalent of all benefits. It's normally collected via an adjustment to your tax code, so you'll notice a higher deduction on your payslip.
Your employer pays Class 1A National Insurance at 15% on the same total. You do not pay Class 1 NI on most P11D benefits (payrolled benefits are different). Class 1A is the employer's cost, and it's due annually by 22 July following the end of the tax year.
Frequently asked questions
What is a P11D form?
P11D is the HMRC form employers use to report taxable expenses and benefits-in-kind (BIKs) provided to directors and employees — things like company cars, private medical insurance, interest-free loans, and living accommodation. It must be filed by 6 July each year for the tax year just ended, and the cash equivalent of each benefit is added to the employee's taxable income.
How is tax on benefits-in-kind calculated?
Each benefit has a "cash equivalent" calculated under HMRC rules (e.g. list price × CO2-based BIK% for company cars, a flat £4,170 for vans in 2026/27). The total cash equivalent is added to your taxable income and taxed at your marginal rate — 20%, 40%, or 45% in England, Wales and NI. Your employer also pays Class 1A National Insurance at 15% on the total.
What is the Class 1A NIC rate for 2026/27?
The Class 1A National Insurance rate on employer-provided benefits-in-kind is 15% for 2026/27 (and 2025/26). This was raised from 13.8% with effect from 6 April 2025 as part of the Autumn 2024 Budget employer NI changes. Class 1A NIC is paid by the employer, not the employee, and is due by 22 July following the tax year.
What are the P11D deadlines?
P11D and P11D(b) forms must be submitted to HMRC by 6 July following the end of the tax year (so 6 July 2027 for the 2026/27 tax year). Employees must be given a copy of their P11D by the same date. Class 1A National Insurance must be paid to HMRC by 22 July (or 19 July by post).
Is an interest-free loan from my employer taxable?
Only if the total outstanding across all loans exceeds £10,000 at any point in the tax year. Above that threshold, HMRC calculates a notional interest amount at the Official Rate of Interest (3.75% for 2026/27), and you're taxed on that as a benefit-in-kind, less any interest you actually paid on the loan.
Do I have to pay tax on private medical insurance from my employer?
Yes. Private medical insurance paid for by your employer is a taxable benefit. The cash equivalent is the cost to your employer (the premium) minus anything you contribute. It goes on Section I of your P11D and is taxed at your marginal income tax rate. Your employer also pays 15% Class 1A NIC on the premium.
What is the car fuel benefit for 2026/27?
If your employer pays for your private fuel in a company car, you're taxed on a fixed multiplier × your car's BIK%. For 2026/27, the multiplier is £29,200 (up from £28,200 in 2025/26). The van fuel flat charge is £798 (up from £769). For most low-mileage drivers, free private fuel costs more in tax than it saves at the pump.