If you’ve just realised that P11D should be on your radar again, don’t panic. This is one of those tax tasks that has a habit of quietly disappearing into the background… until suddenly it’s very urgent. 

So here’s the simple version of what you actually need to know about P11Ds, who needs to file them, and when everything is due.

What is a P11D, and who actually needs to file one?

A P11D is a form used to report Benefits in Kind (BiK). A BiK is anything an employee or director gets from the business that isn’t part of their salary, but still has a taxable value. 

Think of it as HMRC’s way of tracking the “extras” on top of pay.

Common examples include:

• Company cars (and fuel).
• Private medical insurance.
• Low or interest-free loans.
• Accommodation provided by the business.
• Expenses paid by the company that aren’t processed through payroll. 

Basically, if it feels like a perk, then there's a good chance it needs to be reported on a P11D.

It’s also worth noting that HMRC has been gradually encouraging more benefits to be processed through payroll instead of P11Ds where possible. If you want a broader overview of how recent changes in the tax landscape could affect reporting, we’ve covered that in more detail in our article “Preparing for the new tax landscape”. 

That said, many businesses still need to file P11Ds, especially for things like company cars, director’s loans, and private medical insurance.

{{ltd-guide}}

Who needs to file a P11D?

You’ll usually need to file P11Ds if you’re an employer and you’ve provided taxable benefits during the tax year. This includes:

• Employees.
• Directors (yes, even if it’s just you as a Limited Company director).
• Certain company officers.

If no one in your business has received any Benefit in Kinds, you may not need to file anything at all. But if you’re unsure, it’s worth checking properly with an accountant rather than assuming you’re in the clear.

Sole Traders are usually exempt unless they also have employees receiving taxable benefits.

What information goes on a P11D?

Each P11D reports the value of benefits provided to an individual employee or director.

Typically, you’ll need to include:

• The type of benefit provided.
• The cash value of that benefit.
• Any contributions made by the employee.
• Relevant dates (for example, when a benefit started or ended).
• Any taxable costs linked to the benefit under HMRC rules.

Each employee who receives benefits will usually need their own P11D form.

You’ll also need to complete a P11D(b), which is a summary showing the total value of all benefits provided and how much Class 1A National Insurance is due.

Why is this so important?

P11Ds aren’t just a formality. They feed directly into how HMRC calculates tax and National Insurance on employee benefits. Getting them wrong, or missing them altogether, can lead to penalties, interest charges, and a lot of unnecessary admin later on. Which is why understanding the P11D deadlines properly matters more than it first looks.
‍

The P11D deadline for the 2025/26 tax year

For the tax year April 6th 2025 to April 5th 2026, the key P11D dates are:

April 6th 2026:
You can start preparing your P11Ds once the tax year has ended and your records are ready to be pulled together.

If you need to file a P11D, it’s also worth remembering that this often needs to be done before you can fully wrap up your Self Assessment.

July 6th 2026:
P11D and P11D(b) submission deadline.

So in reality, you’ve got a window between April and July 2026 to get everything pulled together and filed. And while July might feel like a comfortable deadline, it’s usually much better to get ahead of it and avoid it clashing with Self Assessment.

What about P11D payment deadlines?

Once you’ve submitted your P11D and P11D(b), HMRC will confirm how much Class 1A National Insurance you owe on those benefits.

The payment deadline is:

• July 19th 2026: If you’re paying by cheque. 
• July 22nd 2026: If you’re paying by other methods. 

Why this timing matters

One important thing to keep in mind is that P11Ds can hold up your Self Assessment process if they apply to you.

So the sooner you get your P11Ds done for the 2025/26 tax year, the easier everything else becomes. Less chasing. Less stress. And fewer “why is this still open?” moments in July.

{{cta-limited-company}}

Don’t forget!

Remember, you can’t finalise your Self Assessment properly until your P11D position is sorted. So the sooner you deal with your P11Ds, the smoother everything else runs afterwards.

Worried about P11D deadlines?

They aren’t usually complicated, but they do have a habit of creeping up on people if you’re not keeping an eye on the P11D deadlines.

Most of the stress comes from leaving everything until the last minute or trying to piece together benefit information right before the deadline. Once you know what needs reporting and when it’s due, it becomes much easier to stay on top of. The key is really just keeping things ticking over during the year, so July doesn’t turn into a scramble.

If you’d rather not have to deal with P11Ds, payroll, Self Assessment and Year End admin sitting on your shoulders, we can help. Everything’s set up to keep it clear, manageable, and handled without the usual last-minute rush. So you can get the deadlines done, without the stress that usually comes with them.

If you want support, you can get an instant quote.

‍