If you provide your employees — or yourself as a director — with perks like a company car, private medical insurance, or a gym membership, HMRC wants to know about it. That is where the P11D comes in. Understanding what is a P11D, who needs to complete one, and what happens if you get it wrong is genuinely useful knowledge for any employer running a UK limited company or small business.

It is also a topic that has shifted quite a bit recently. The mandatory move to payrolling benefits from 6 April 2026 means the P11D is effectively being phased out for most employers — but that does not mean the underlying obligations have gone away. The reporting has moved, not disappeared.

In this post we will explain what the P11D is, what goes on it, and what the 2026 changes actually mean for you in practice.

A P11D is a form submitted to HMRC by employers at the end of each tax year. Its purpose is to declare the cash value of any benefits in kind (BiKs) provided to employees or directors during that year — things that are not processed through the payroll and taxed in the usual way.

Benefits in kind are non-cash perks with a monetary value. Common examples include:

• Company cars and fuel
• Private medical or dental insurance
• Gym memberships
• Interest-free or low-interest loans above £10,000
• Non-business travel and entertainment
• Living accommodation provided by the employer

The reason HMRC cares is straightforward: these perks have a real financial value to the recipient, and that value is treated as taxable income. Without a reporting mechanism, employees could receive substantial untaxed remuneration through benefits rather than salary.

Alongside the P11D for each relevant employee, employers also submit a P11D(b) — this is the summary form that declares the employer’s own liability for Class 1A National Insurance Contributions on those benefits. Class 1A NIC is currently charged at 13.8% of the taxable value of benefits provided, and it is the employer’s cost, not the employee’s.

Since 6 April 2023, both forms must be submitted online via HMRC’s systems. Paper returns are no longer accepted.

Any employer who provides benefits or expenses to employees or directors that are not already processed through payroll needs to submit a P11D for each affected individual. That includes owner-managed limited companies where the director is also the sole employee — which covers a large proportion of our clients.

It is worth being clear: if you are a director of your own limited company and you have a company car, private health insurance paid by the company, or any other non-cash perk, you are both the employer providing the benefit and the employee receiving it. The P11D still applies.

There is an exemption for benefits covered by a PAYE Settlement Agreement (PSA), and certain trivial benefits (worth less than £50, not cash, not connected to performance) do not need to be reported. But the default position is: if your company provides it and it has a value, HMRC expects to hear about it.

The deadline for filing P11D forms is 6 July following the end of the tax year. Class 1A NIC on those benefits must be paid by 19 July (or 22 July if paying electronically). Penalties for late submission of the P11D(b) run at £100 per 50 employees for each month the form is overdue. Errors on individual P11D forms can result in penalties of up to £3,000 per form — so accuracy matters as much as timing.

From 6 April 2026, HMRC has mandated that most benefits in kind must be reported in real time through payroll software — a process called payrolling benefits. This replaces the annual P11D for the majority of employers.

Under the old system, an employee received a benefit during the year, a P11D was filed in July, and the tax owed was often collected by adjusting the employee’s tax code the following year — meaning tax on a 2024/25 benefit might not actually be paid until 2026/27. HMRC estimates this change will stop around 4 million people from having their income tax collected that far in arrears.

Under the new system, the value of benefits is included in the employee’s payslip each month and taxed in real time via the Full Payment Submission (FPS) — the same mechanism used for regular payroll reporting.

Two important caveats to note:

• Employment-related loans and employer-provided accommodation are not yet mandated. These can be voluntarily payrolled from April 2026, but mandatory reporting for these will come at a later date.
• Payrolling benefits does not eliminate Class 1A NIC. Employers still need to calculate and pay Class 1A NIC at year end, and a P11D(b) or equivalent declaration will still be required for that purpose.

In short: the P11D as a reporting vehicle for most benefits has been superseded, but the underlying tax obligations remain. The paperwork has changed shape, not gone away.

If you were previously filing P11D forms for benefits in kind, the transition to payrolling requires some active steps — it does not happen automatically.

Your payroll software needs to be set up to include the taxable value of benefits in each pay run from April 2026 onwards. If you use a payroll bureau or accountant to run payroll, they should be handling this for you — but it is worth confirming, because errors in the transition period are easy to make and the penalties for incorrect reporting can be meaningful.

One area where we see confusion is around benefits that vary month to month. Something like a company car is relatively straightforward to payroll — the taxable value is calculated annually and divided by twelve. But benefits that fluctuate in value during the year, like health schemes with varying membership costs or ad hoc expenses, require more careful tracking. The real-time nature of the new system means you cannot simply reconcile everything in July any more.

For employers who were voluntarily payrolling benefits before April 2026, the change simply makes their existing approach mandatory. For those who were still relying on the P11D route, this is a genuine process change that requires updating your payroll setup.

If you are unsure how your payroll is set up or whether your benefits are being reported correctly under the new rules, this is exactly the kind of thing we help clients work through at Edward Harris — often as part of our ongoing payroll and year-end support.