Benefit in Kind Calculator (P11D)

A P11D is the form a UK employer files with HMRC to report the cash equivalent value of benefits in kind and expenses provided to each director or employee above the £2,000 expenses exemption. It covers the tax year just ended, runs from 6 April to 5 April, and must be submitted by 6 July after the tax year ends. Benefits that go on a P11D are taxed on the employee at their marginal rate and trigger a separate Class 1A National Insurance charge for the employer.

The employee pays income tax on the cash equivalent at their marginal rate. A £1,000 benefit costs a basic-rate taxpayer £200, a higher-rate taxpayer £400 and an additional-rate taxpayer £450. For most benefits the tax is collected by reducing the employee's tax code for the following year, so the cash does not leave the employee's pocket until the code change takes effect. Where the employer has registered to payroll benefits, the charge flows through PAYE in real time and no P11D is needed for those items.

The table below shows the employee tax and employer Class 1A NI for a £1,000 cash equivalent at each rate in 2026/27.

Class 1A NI is an employer-only charge of 15% on the taxable value of most benefits in kind in 2026/27. It is reported on form P11D(b) and paid to HMRC by 22 July (or 19 July for non-electronic payments) after the end of the tax year. Unlike Class 1 employer NI, it is not deducted from the employee's pay, has no lower threshold and is not collected through the regular payroll run — it is a one-off annual charge based on the P11D values.

The most common reportable perks in 2026/27 are company cars and fuel, private medical and dental insurance, beneficial loans over £10,000, gym memberships, living accommodation and assets given to an employee. Trivial benefits costing £50 or less that are not cash or a reward for work are exempt under the trivial benefits rules. Vouchers and credit tokens that do not qualify as trivial are also reportable, and the rules around them are stricter.

Employers can choose to payroll benefits instead of filing a P11D for them. HMRC registration is required first, and once registered the employee charge is run through PAYE each pay period, which removes the end-of-year P11D for those items but still leaves a P11D(b) for the Class 1A NI. Payrolling is usually cleaner for payroll teams and gives employees an accurate in-year view of what their perks cost. The election to payroll must be made before the start of the tax year for most benefits, so plan ahead for April.

Enter the cash equivalent value, pick the employee's marginal rate, and read off the employee tax and employer Class 1A NI. Use the figures to plan payroll, register for payrolling if appropriate, and complete the P11D and P11D(b) at year end. For a quick comparison of the same perk under different rates, adjust the rate selector — the Class 1A NI figure stays at 15% of the cash equivalent regardless of the employee.

A real P11D often contains more than one benefit. Private medical insurance, beneficial loans, gym memberships, living accommodation, vans, fuel and other taxable benefits can all sit on the same employee record. Use the calculator for one benefit at a time, then add the taxable values together to estimate the employee tax and employer Class 1A NI. A multi-benefit checklist is safer than treating the largest benefit as the whole P11D exposure.

The employer should identify taxable benefits during the tax year, confirm whether benefits are payrolled or reported on P11D, reconcile employee contributions, prepare P11D forms after year end, submit the P11D(b), pay Class 1A National Insurance by the deadline, and give employees their benefit details. The most common failure is leaving the P11D review until after payroll year end, when employee contributions and private-use records are harder to verify.

Payrolling benefits taxes the employee through PAYE during the year instead of reporting most benefits on a P11D after year end. It can reduce surprise tax-code changes, but the employer still needs accurate benefit values and still files P11D(b) for Class 1A NI. Company cars, medical insurance and recurring benefits are good candidates for payrolling; one-off or uncertain benefits often need extra review.