P11D and Benefits in Kind 2026: What Employers Must File, When, and What's Changing in 2027

There are two dates in the summer that sit in the payroll calendar like unexploded ordnance. They come around every year. Every year, someone discovers them late.

The first is 6 July. That is when the P11D has to be with HMRC — the declaration of every taxable benefit provided to every employee and director in the 2025/26 tax year. Company cars. Private medical. Low-interest loans. Anything the business gave its people that wasn't cash.

The second is 19 July — 22 July if you're paying electronically. That's when the Class 1A National Insurance on those benefits has to land at HMRC. Currently 15% of the taxable value of every benefit declared.

Neither of these is new. Both of them generate a disproportionate number of late filing penalties each year. The reason is simple: they sit outside the monthly payroll rhythm. The payroll runs every month. The P11D runs once a year in the summer, and the summer is when people go on leave, and it slips.

The P11D for 2025/26 is due 6 July 2026. The Class 1A NI payment is due 19 July 2026. If your business provides any benefit in kind to any employee or director, these dates apply to you.

What Has to Be on a P11D

A P11D is required for any employee or director who received a taxable benefit during the tax year. One form per person. Submitted online — HMRC no longer accepts paper P11Ds.

The benefits that generate a P11D obligation include:

Company cars and fuel — the taxable value is calculated from the car's list price and its CO2 emissions figure. The benefit value changes when the car changes, when business mileage changes, and when the car is available for part of a year only.

Private medical insurance — the full premium cost paid by the employer is the taxable value, including family cover. Even if the employee has never made a claim, the premium paid on their behalf is a benefit.

Low-interest or interest-free loans — any loan to an employee or director where the interest charged is below HMRC's official rate (3.75% from April 2025, reviewed quarterly from April 2026) generates a benefit equal to the difference between the interest charged and the official rate. This catches director loan accounts where no interest is being charged.

Living accommodation — where an employer provides housing to an employee other than in specific exempt circumstances, the rental value is a benefit.

Other benefits — gym memberships, mobile phones beyond one per employee, vouchers, company subscriptions paid on behalf of individuals. The list is longer than most employers expect.

Not on the P11D: mobile phones where the contract is in the employer's name and one per employee is provided, work-related training, employer pension contributions, certain childcare provision, the cycle-to-work scheme, and genuinely trivial benefits under £50 per instance.

The Voluntary Payrolling Question

Since April 2016, employers have been able to payroll benefits in kind voluntarily — reporting the taxable value through the payroll each month rather than on a year-end P11D.

If your business registered for voluntary payrolling before 5 April 2026, you can operate it for 2026/27. Your employees will not receive P11Ds for the payrolled benefits — the tax is collected through PAYE throughout the year instead.

If you did not register before 5 April 2026, voluntary payrolling is not available to you for 2026/27. You will file P11Ds in July 2027 for the 2026/27 year, as usual.

There are two benefits that cannot be voluntarily payrolled regardless: accommodation and beneficial loans. These continue to go on P11Ds. This will change under mandatory payrolling from April 2027, though the mechanism for these complex benefits is still being finalised by HMRC.

What Mandatory Payrolling in 2027 Actually Means

From April 2027, most employers will be required to report taxable benefits through the payroll in real time rather than via year-end P11D forms. The P11D will effectively be abolished for the majority of benefits.

The practical effect: benefits in kind will be included in the payroll run each month, the employee will pay tax through PAYE on the benefit value as they receive it, and the employer will pay Class 1A NI through the payroll simultaneously rather than in a lump sum in July.

For employees this is better — no unexpected tax bill from a P11D that adjusted their tax code. For employers the cash flow changes — instead of a July NI payment, it's spread across the year.

For 2026/27 — the year we are currently in — nothing changes for most employers. P11D system as it always was. File by 6 July 2027 for this year's benefits. The mandatory system kicks in for benefits provided from 6 April 2027 onwards.

The thing to do now is check what benefits you provide, how you're tracking their values, and whether your payroll software is scheduled for the April 2027 update. The employers who get caught by mandatory payrolling are the ones who haven't built the tracking process that makes monthly real-time reporting possible.

The Director Loan Account Problem

This one catches more director-only companies than almost any other benefit in kind.

If a director's loan account goes overdrawn — the director has drawn more from the company than they have put in — and the company has not charged interest at or above HMRC's official rate, there is a benefit in kind to declare.

For the 2025/26 tax year, the official rate was 2.25% until April 2025, then 3.75% from April 2025. If the director's loan balance exceeded £10,000 at any point and interest below the official rate was charged (or no interest was charged), the difference is a benefit in kind. It goes on the P11D. Class 1A NI at 15% is payable on the benefit value.

The accountant normally catches this at year end. The issue is that year end is March or April, and the P11D deadline is July, and the two don't always connect cleanly.

bookd. manages P11D preparation and filing as part of the year-end payroll cycle for clients who require it. The 6 July deadline doesn't move. If benefits in kind were provided to employees or directors in 2025/26 and the P11D process hasn't started, the window is closing.