What Is a P11D? UK Benefits in Kind Explained for 2026/27

A P11D is the form your employer files with HMRC at the end of every tax year listing the cash value of the perks they gave you outside of salary. Company car, private health cover, interest-free loan, accommodation, employer-paid gym, anything the taxman thinks you would have paid for yourself if it had come out of your post-tax wages. The form turns those perks into a number, and the number turns into a chunk of tax HMRC then takes from you - usually by adjusting your tax code so it drips out of every payslip across the following year.

The P11D is also the form HMRC has just announced it is killing. From 6 April 2027, almost all benefits in kind must be payrolled in real time via PAYE. The legacy P11D paper-style trail of "report the benefit a year late, adjust the tax code, hope the maths catches up" is being replaced by deducting the tax as the benefit lands. The 2026/27 tax year is the last full year the traditional P11D regime runs. This article walks through what the form actually does, the 6 July deadline, the Class 1A National Insurance the employer pays on top, and what changes when payrolling becomes mandatory.

It is the third in the UK tax forms trio with what is a P60 and what is a P45.

What a P11D actually reports

The categories on the form are wider than most employees realise. The full list runs to about 14 sections. The ones that matter to most UK workers:

• Company car - taxed on the cash equivalent calculated from the list price, CO2 emissions, and fuel type. The biggest single P11D figure most workers see.
• Company car fuel - if your employer provides fuel for private use, the fixed multiplier figure HMRC publishes each tax year (multiplied by the same CO2-based percentage as the car) treats every drop of private fuel as your tax liability whether you use it or not. Check the current-year figure on gov.uk before relying on a back-of-envelope estimate.
• Private medical and dental cover - the gross premium paid by your employer is taxable.
• Living accommodation - usually only relevant where the employer provides housing.
• Interest-free or low-interest beneficial loans over £10,000 - the deemed interest above the official rate counts.
• Vouchers and credit tokens - childcare voucher legacy schemes, gift vouchers, season ticket loans (different rules from beneficial loans).
• Mileage allowance over the AMAP rate - if your employer pays you more than 45p per mile (cars / vans, first 10,000 miles), the excess is a benefit.
• Gym membership, broadband, mobile phone - case by case, depending on whether the benefit is "wholly, exclusively, and necessarily" for work.

The P11D records the cash equivalent. The tax you pay on that figure is your marginal income tax rate (20%, 40%, or 45%). On top of that, your employer pays Class 1A National Insurance at the same rate as employer NI - 15% for 2026/27 - on the same figure. Class 1A is the employer's liability, not yours, but it directly shapes how much extra benefit-vs-salary an employer is willing to give you.

The deadlines

The P11D regime runs on a tight calendar at the end of every tax year.

The 6 July deadline for the employer is hard. The penalty for missing it is £100 per 50 employees per month (or part-month) the form is late, payable by the employer. HMRC also charges interest from 19 July on any unpaid Class 1A NI.

The deadline for HMRC to act on the P11D and update your tax code is much looser. Most P2 coding notices arrive between September and December for the benefits reported in July, meaning the K-code adjustment that drains your monthly take-home pay often does not start until you are halfway through the tax year after the one the benefit was given in.

How the P11D turns into a tax code

The cash equivalent on your P11D gets added to your taxable income. HMRC then issues a P2 coding notice that subtracts the benefit value from your personal allowance for the current tax year. The new code applies via PAYE, drip-collecting the tax out of every monthly payslip.

A worked example. You are a basic-rate taxpayer earning £40,000 in 2026/27 on standard code 1257L. Your employer gives you a company car worth £4,500 a year in P11D cash equivalent. The maths:

• 2026/27 personal allowance: £12,570 - £4,500 P11D benefit = £8,070 adjusted allowance
• New tax code: 807L (the L stays because nothing else changed; the number drops)
• Extra tax through the year: £4,500 x 20% = £900
• Monthly impact: about £75 a month less in take-home pay

Higher-rate taxpayers double the impact (£1,800 a year, £150 a month). For benefits with cash equivalents over the personal allowance - a high-end company car plus fuel, or a large living-accommodation benefit - the calculation flips into a K code, which adds the excess to your taxable income rather than subtracting it from your allowance.

This is the rebate-relevant catch. Most P11D K-code adjustments are set in advance using last year's benefit figure. If you changed cars, dropped private health cover, or paid off a beneficial loan, the K-code estimate is stale and you are overpaying. The fix is to update your personal tax account at gov.uk/personal-tax-account with the current benefit, request a recalculated code, and reclaim the overpayment via the same routes covered in the tax rebate UK guide.

What changes from April 2027: mandatory payrolling

HMRC published the timetable for mandatory payrolling of benefits in kind across 2024 and early 2025. The headline:

• April 2026: voluntary payrolling continues as it has done since 2016. Employers can already opt to deduct the tax on benefits through PAYE in real time rather than wait for the P11D.
• April 2027: almost all benefits in kind become mandatory payrolled. The annual P11D is phased out for the vast majority of benefits. Employer-provided living accommodation and certain beneficial loans get a grace period for further consultation.

The practical effect for employees:

1. The tax on benefits stops draining your take-home over the year after they were given. It comes off the payslip in real time, the same month the benefit applies.
2. K codes driven by stale P11D estimates largely disappear. Your tax code stays closer to 1257L, with the benefit tax appearing as a payslip deduction rather than a tax-code adjustment.
3. The cash-flow hit is more obvious because you see it monthly rather than gradually. Workers used to receiving a benefit and only noticing the tax cost a year later will get a sharper picture of what their benefits actually cost them in net pay.

For 2026/27 specifically, the legacy regime is still running and the P11D is still the form to expect in early July 2027 covering the benefits you received this tax year. The transition matters most for company-car drivers and anyone with a high-value benefit, because they will see the real-time deduction starting in the 2027/28 cycle.

What to do if your P11D looks wrong

Your employer must give you a copy of the P11D by 6 July following the tax year - either a paper copy, a PDF in the company portal, or a payroll-system download. Three things to check:

1. Does the cash-equivalent figure match your benefits? Cross-reference each line against the policy or benefit you actually received. Private medical premiums often shift mid-year; company-car values can be wrong if HMRC's car list has not been updated for trim level or fuel type changes; beneficial loan interest changes when the official rate moves.
2. Are there benefits listed you did not receive? Mistakes happen when employees move between schemes or leave a benefit mid-year. The cash equivalent should be pro-rated.
3. Are benefits missing that you did receive? Less common but more dangerous. If HMRC catches an unreported benefit later it can backdate the assessment and add interest and penalties to your tax bill.

If the figure is wrong, raise it with payroll first. They can amend the P11D and resubmit. If payroll will not act, you can challenge the figure directly with HMRC via the personal tax account, but you need supporting evidence (policy schedules, employer correspondence). For closed prior years, the four-year backstop applies to any refund: the 2022/23 P11D corrections close on 5 April 2027.

P11D vs P60 vs P45

These three forms get conflated routinely. The plain-English version:

• P60 (what is a P60) is the year-end summary your employer gives you of total pay and tax through PAYE. One per tax year per job, given to you by 31 May after the tax year.
• P45 (what is a P45) is the form your employer gives you when you leave a job. Records pay and tax to the date of leaving, plus your tax code. You hand it to the next employer to keep PAYE cumulative.
• P11D is the form your employer gives HMRC, with a copy to you, listing benefits in kind given outside of salary. Different purpose, different deadline, different recipient.

A worker with no benefits in kind and a single PAYE job through the year gets a P60 and no P11D. A worker with private medical, company car, or any other non-salary benefit gets both. A worker who changed jobs gets a P45 from the leaving employer and a P60 from the joining employer (covering the part of the year there).

Frequently Asked Questions

When should I receive my P11D for 2025/26?

By 6 July 2026. Your employer is legally required to submit the P11D to HMRC and give you a copy by that date. If you have not seen yours by mid-July, ask payroll directly - the employer may have submitted to HMRC but forgotten to share the copy. If you have already left the employer, request a copy of the P11D in writing; they are required to provide it.

Do I need to file a P11D myself?

No. The P11D is filed by your employer, not by you. Your only obligation is to check the copy you receive and challenge any errors. You may need to file a Self Assessment tax return separately if your total benefits push you over the £100,000 personal-allowance-taper threshold or trigger any other Self Assessment requirement, but that is a Self Assessment question, not a P11D filing requirement.

What is the difference between P11D and P11D(b)?

The P11D is per-employee, listing benefits given to one named worker. The P11D(b) is per-employer, declaring the total Class 1A National Insurance the employer owes HMRC on all P11D benefits given to all employees that tax year. The employer files a P11D for every benefit-receiving employee and a single P11D(b) summarising the total Class 1A NI liability. Class 1A is the employer's NI, not yours - it does not appear on your payslip and does not come out of your wages.

Will the P11D disappear in 2027?

Largely yes. HMRC has confirmed mandatory payrolling of benefits in kind from 6 April 2027 for almost all benefit categories. The legacy P11D process for those benefits gets retired in favour of real-time PAYE deduction. Employer-provided living accommodation and certain beneficial loans get a grace period for further consultation, so the very last P11D forms covering specific edge-case benefits may run into 2028/29. For the vast majority of employees with a company car, private medical, or other standard benefits, the P11D you receive in mid-2027 for the 2026/27 year is your last one.

What is the penalty if my employer misses the P11D deadline?

£100 per 50 employees per month or part-month the P11D and P11D(b) are late. The penalty falls on the employer, not on you. Interest also accrues from 19 July on any unpaid Class 1A National Insurance. The penalty does not get passed through to you - but a late P11D usually means a late tax-code update, which means the K-code adjustment hits later in the year and concentrates the tax bill into fewer paychecks.

Can I refuse a benefit in kind to avoid the P11D tax?

Yes, but check the maths first. Most cash-equivalent benefits are still better than equivalent gross salary because employer Class 1A NI is the only social-security cost, versus salary which carries employee NI plus pension auto-enrolment plus full income tax. The bigger trap is a benefit that does not actually save you money once the tax is paid: company-car fuel cards in particular almost always cost more than refunding mileage. The honest rule of thumb: if the benefit replaces something you would have bought anyway with post-tax income, it usually wins. If it adds a category of spending you would not otherwise have, it usually loses.

Where can I find my P11D history?

Your personal tax account at gov.uk/personal-tax-account holds your P11D history for previous tax years under "Pay As You Earn". HMRC keeps records for at least six years. Past employers also keep copies for at least three years after the tax year ends. If you have lost a recent P11D and need it for a Self Assessment return or a mortgage application, the personal tax account is the quickest route.

This article is general educational content, not financial or tax advice. UK benefit-in-kind tax rules, deadlines, and Class 1A National Insurance rates can change between tax years and at any Budget. The April 2027 mandatory-payrolling timetable is set out in HMRC's published guidance and is subject to further consultation on certain benefit categories. Verify specific rates or deadlines against gov.uk before acting on them.