Benefits in kind: Don’t let the P11D deadline catch you out

The summer is quickly creeping up on us. One minute you’re closing off the tax year, the next you’re staring down a list of benefits you provided months ago and trying to work out what HMRC needs to know about them by the P11D deadline.

If your business gave employees anything beyond their salary in 2025/26, such as a company car, health cover, a low-interest loan, accommodation, or even a gym membership, you will need to report these soon.

Here’s a straightforward look at what’s required this year, and an important heads-up about how this whole process is changing.

Your 2025/26 P11d reporting checklist

There are three key dates that matter:

  • 6 July 2026 – the deadline for filing your P11D forms and the P11D(b) summary with HMRC, and for giving employees their own copy of the information. Filing is online only, as paper forms haven’t been accepted for some time.
  • 19 July 2026 – Class 1A National Insurance must reach HMRC by this date if you’re paying by post. The rate for 2025/26 sits at 15 per cent of the total benefit value.
  • 22 July 2026 – The equivalent deadline if you’re paying electronically.

Penalties for missing the filing deadline are automatic and set at £100 for every 50 employees per month (or part month) the P11D(b) is late.

Late Class 1A NIC payments attract interest plus escalating percentage penalties starting at 5 per cent after 30 days, climbing further at six and twelve months.

The cost of forgetting to meet the deadline can quickly dwarf the cost of the benefits provided.

Big change to P11D is on the horizon

HMRC is winding down the traditional P11D form and from 6 April 2027, payrolling of most benefits in kind (BIK) becomes mandatory.

This means that income tax and Class 1A NIC will be collected through payroll in real time, every pay period, rather than reported once a year on a P11D.

This was originally planned for April 2026 but has been deferred by twelve months, giving employers and software providers more time to prepare.

What this means for you right now

Here are some steps that you can take now to make the transition easier:

  • Get your BIK information in order – Whether you payroll early or wait, you’ll need a clean, complete record of every benefit you provide, what it’s worth, and which employees receive it. Most last-minute P11D headaches come down to incomplete tracking through the year.
  • Brief your employees – Anyone moving onto payrolled benefits will see the tax appear in their monthly pay rather than via a tax code adjustment. In the transition year, some may temporarily pay tax on both the previous year’s benefits (via their code) and the current year’s (via payroll). Forewarning prevents awkward conversations on payday.
  • You don’t need to register for the mandatory 2027/28 regime yet – HMRC’s registration window for that is expected to open in November 2026. You also still need to file a P11D(b) and pay Class 1A NIC even if you payroll benefits voluntarily, so don’t assume early adoption removes all year-end admin. It doesn’t, yet.

Here to help

If you’d like a hand reviewing your benefits, deciding whether to payroll early, or simply getting this year’s submission over the line, our team is here to help.