If your company gives an employee or director anything of value beyond their salary — a company car, private medical cover, an interest-free loan — there is a fair chance HMRC wants to know about it. The form that captures most of this is the P11D, and for many small employers it is one of the more confusing pieces of the payroll year.

It needn't be. Once you understand what counts as a benefit in kind, who pays tax on it, and when the paperwork is due, the P11D becomes a manageable annual job rather than a source of dread. Here is how it works in 2026.

This article is general information, not tax advice. Rates, thresholds and reporting rules change, and HMRC is in the process of reforming how benefits are reported. Always confirm the current position on GOV.UK or with your accountant before filing anything.

What is a P11D, and what is a benefit in kind?

A benefit in kind (BIK) is something an employee or director receives from their employment that isn't cash pay but still has a monetary value. Because it has value, HMRC generally treats it as taxable, much like salary. The classic examples are a company car available for private use, private medical insurance, an interest-free or low-interest loan above a certain size, gym memberships, and living accommodation.

The P11D is the form an employer files at the end of the tax year to tell HMRC the cash-equivalent value of the benefits each individual received. There is also a P11D(b), which reports the employer's Class 1A National Insurance bill on those benefits — more on that shortly. Directors of their own limited companies are caught by exactly the same rules, which surprises a lot of one-person businesses.

Which benefits have to be reported?

Not everything you give staff is reportable. Some perks are specifically exempt, and using those exemptions well is the smart way to reward people without creating a tax charge.

Things that usually do need reporting include:

  • Company cars and fuel provided for private use
  • Private medical and dental insurance
  • Interest-free or cheap loans above the HMRC threshold
  • Living accommodation provided by the business
  • Assets given to an employee, or made available for personal use

Things that are commonly exempt (so no P11D entry) include reimbursed business expenses, certain mobile phones, eye tests for screen users, and small one-off perks that meet the trivial benefits rules. Those small gifts deserve their own attention — see how the exemption works in our guide to trivial benefits and tax-free staff gifts, because a £50 thank-you handled correctly costs nothing in tax.

Company cars are the single most common — and most miscalculated — benefit. The taxable value depends on the list price and the car's CO2 emissions, which is why an electric car can be dramatically cheaper to provide than a petrol one. Our explainer on company car tax and BIK walks through the sums.

The benefit a director values most — a company car or private medical cover — is often the one that creates the biggest reporting and National Insurance bill. Plan the reward and the paperwork together, not separately.

Payrolling benefits: the changing picture

For years, the default was to report benefits annually on a P11D. Increasingly, employers instead payroll their benefits — adding the cash-equivalent value to the employee's pay each period so the tax is collected through PAYE in real time, rather than via a tax-code adjustment after the year end.

This matters in 2026 because HMRC is moving towards making payrolling of most benefits mandatory. The direction of travel is clear: fewer end-of-year P11Ds, more real-time reporting through payroll. The exact start date and which benefits are included have shifted, so this is precisely the area to check on GOV.UK rather than rely on last year's process. If you payroll benefits, you generally still need to file a P11D(b) for the Class 1A NIC. Getting your underlying PAYE and payroll basics right makes the transition far smoother.

Class 1A National Insurance: the employer's bill

Benefits in kind don't just cost the employee in income tax. The employer also pays Class 1A National Insurance on most reportable benefits, at the employer NIC rate. So if you give a director private medical cover worth, say, £1,200 a year, the company owes Class 1A on that £1,200 on top of the value itself.

This is reported on the P11D(b), and the payment has its own deadline. It is an easy figure to forget when you are budgeting the true cost of a perk — the headline value plus roughly the employer NIC rate is closer to the real number. For the bigger picture on employer contributions, see our overview of National Insurance for small businesses.

Deadlines and avoiding penalties

The reporting and payment dates fall after the tax year ends on 5 April:

  • P11D and P11D(b) filing — by 6 July following the end of the tax year.
  • Giving employees a copy of their benefit details — also by 6 July.
  • Paying the Class 1A NIC — by 22 July if paying electronically (slightly earlier for post).

Confirm these exact dates on GOV.UK each year, but the pattern is stable: file by early July, pay by late July. Miss the P11D(b) deadline and penalties accrue monthly based on the number of employees, plus interest on late-paid NIC. The errors HMRC sees most often are forgetting directors entirely, undervaluing a company car, and overlooking the Class 1A bill. None of those are hard to avoid once you know to look for them.

A practical routine for small employers

Treat benefits as a year-round record, not a July scramble. Keep a simple running list of who receives what — car, medical, loan, accommodation — and the value. Decide early whether you'll payroll benefits or report on P11D, and stick to one approach. Before the deadline, reconcile your list against payroll, calculate the Class 1A, file, pay, and give each person their copy. If you run a single-director company, do not assume you are off the hook: you are an employee for these purposes.

Frequently asked questions

Do I need to file a P11D if I'm the only director and take a salary plus dividends?

Only if the company provides you with a reportable benefit in kind — a company car, private medical cover, a director's loan above the threshold, and so on. If you take pay and dividends with no perks, there may be nothing to report. But if the company pays for anything personal on your behalf, it likely needs reporting, so check carefully.

What's the difference between a P11D and payrolling benefits?

Both report the same benefits and trigger the same Class 1A NIC. The difference is timing: a P11D reports values once after the tax year, with tax collected via a code adjustment, while payrolling adds the value to each pay period so income tax is collected in real time. HMRC is moving towards payrolling becoming the norm, so it's worth setting up sooner rather than later.

How is the value of a company car calculated?

It's based on the car's list price multiplied by a percentage set by its CO2 emissions (and fuel type), with electric and low-emission cars attracting much lower percentages. Provided fuel for private use is taxed separately. Because the bands change regularly, always use the current figures on GOV.UK or a calculator when working out the benefit.

P11Ds reward the organised. Keep a tidy record through the year, decide your reporting method early, and the July deadline becomes a formality. For more straight-talking guides on tax, payroll and running a small business, you can subscribe to our plain-English newsletter and skip the jargon.