You gave a member of staff a company van, covered their private health insurance, or paid a gym membership during the 2025-26 tax year. Those perks now have a paper trail to complete, and the P11D deadline of 6 July 2026 is the date it all has to be with HMRC. Miss it and the penalties start at £100 per 50 employees for every month the forms are late, so June is the month to get this sorted rather than the first week of July.

What a P11D actually is

A P11D is the form an employer files to report taxable benefits in kind given to employees or directors during the tax year. Anything of value provided on top of salary can count: company cars and vans, private fuel, medical insurance, interest-free loans over £10,000, and living accommodation are the common ones. HMRC publishes a full A to Z of expenses and benefits that sets out the treatment of each item in plain terms.

Timing causes confusion too. The form covers the tax year just ended, not the current one, so the P11Ds due by 6 July 2026 report benefits provided between 6 April 2025 and 5 April 2026. A van handed over in May 2026 belongs on next year’s form, although a part-year benefit from earlier in 2025-26 still needs reporting for the months it was available.

Alongside the individual P11Ds, employers file one P11D(b). This summarises the Class 1A National Insurance owed on the benefits, charged at 15% of their total taxable value for 2025-26. Even if every benefit was taxed through the payroll during the year, a P11D(b) is still needed to declare the Class 1A liability.

Directors of small limited companies often forget that the rules apply to them too. If your company paid for anything personal, from a phone contract in your own name to private medical cover, it usually belongs on a P11D. Our taxation service in Widnes deals with exactly this overlap between company spending and personal tax.

Key dates around the P11D deadline 2026

Diaries first, detail second. Getting the dates into the calendar now removes most of the risk, because the work itself rarely takes long once the records are in front of you.

Three dates matter this summer. Forms P11D and P11D(b) for 2025-26 must reach HMRC by 6 July 2026, and each employee must receive a copy of their P11D by the same date. The Class 1A National Insurance shown on the P11D(b) must then be paid by 19 July 2026 by post, or 22 July 2026 if paying electronically.

HMRC no longer accepts paper P11Ds, so filing is online through PAYE Online or payroll software. The official GOV.UK guidance on expenses and benefits for employers confirms the reporting routes and what happens if you file late. A separate penalty of up to £3,000 per form can apply where a P11D is careless or deliberately wrong, which is why guessing figures is a bad idea.

Payrolling benefits: what changes from April 2027

A bigger shake-up is on the horizon. HMRC originally planned to make payrolling of benefits mandatory from April 2026, then pushed the start back to April 2027. From that date most benefits in kind will be taxed through the payroll in real time and the annual P11D will largely disappear. For now, nothing changes: the 2025-26 forms are still due by 6 July 2026.

The delay is a chance to prepare rather than relax. Employers who register voluntarily for payrolling before the 2026-27 tax year can run a full practice year before it becomes compulsory. If you would like the registration handled and your software set up properly, our payroll services for Widnes employers cover the whole process, including the P11D(b) that still has to be filed for payrolled benefits.

Common mistakes we see every June

After more than a decade of preparing these forms for Widnes employers, the same handful of errors come up every year, and all of them are avoidable with a calm hour in June.

The most frequent error is missing a benefit entirely, usually because nobody connected a company purchase to an employee’s personal use. Vans taken home at weekends, fuel cards used for private mileage, and staff loans that crept over £10,000 all get overlooked. A quick review of the company bank statements for the year usually surfaces them.

Mixing up exempt and taxable items comes a close second. Trivial benefits under £50, one annual function up to £150 a head, and most workplace pension contributions are exempt and stay off the form. Reimbursed business expenses are also generally exempt, provided they were genuinely business costs. Putting exempt items on a P11D inflates the tax your employee pays for no reason.

Finally, plenty of employers file the P11D but forget the P11D(b), or pay the Class 1A late. HMRC charges interest from the due date, and repeated slips attract attention. A short June review with our business support team is usually all it takes to file once, correctly, and move on with the summer.

How to pull the figures together in an hour

Start with the company bank statements and credit card statements for the year to 5 April 2026. Highlight anything that paid for insurance, vehicles, fuel, subscriptions, or loans to staff, then match each item to the person who benefited from it. For most small employers this produces a complete list in well under an hour.

Next, gather the supporting numbers. Medical insurance renewals show the premium for each employee, lease agreements confirm which vehicles were available and when, and loan accounts show the highest balance during the year. Where a benefit was only available for part of the year, note the start and end dates because the charge is reduced proportionately.

Keep the working papers once the forms are filed. HMRC can ask how a figure was calculated years later, and a tidy file turns that request into a five minute job. The same records also make next year’s forms, or the move to payrolling, far quicker to prepare.

Frequently Asked Questions

Get the forms filed before the holidays start

The 6 July 2026 filing date will arrive faster than it feels like it should, and the information is far easier to pull together now than during the holiday season. If you would rather hand the forms over and get back to running the business, contact FD Accountants for a free initial consultation and a clear price before any work starts.