A P11D tax return is the form UK employers use to tell HMRC about benefits in kind and expenses given to employees or directors outside normal payroll — things like company cars, private medical insurance, or interest-free loans. One P11D is filed for each employee who received reportable benefits in the tax year, along with a summary form called the P11D(b) that calculates the employer’s Class 1A National Insurance bill. The filing deadline is 6 July following the end of the tax year on 5 April, and the process is changing significantly: from April 2027, most benefits will have to be reported through payroll software in real time instead.
Who Has to File
Every employer that provided a reportable benefit or reimbursed expenses outside PAYE must file a P11D for each affected employee or director, regardless of how much that person earns. The old £8,500 earnings threshold was abolished before 6 April 2016, so the obligation is now universal.
Directors deserve a specific mention. A director who takes no salary through standard payroll still triggers a P11D if they received any benefit. The filing duty belongs to the employer, not the individual, so identifying everyone who received a benefit is the business’s job.
Employers who have registered to payroll benefits through HMRC’s online service don’t file P11Ds for the benefits they payroll. Two categories still can’t be payrolled, though: employer-provided living accommodation and beneficial loans. If you provide either, a P11D is still required even if everything else is handled through payroll.1GOV.UK. Payrolling Tax on Employees’ Benefits and Expenses Through Your Payroll
What Counts as a Reportable Benefit
The form covers a wide range of non-cash compensation. Common entries include:
- Company cars available for private use, and separately, any fuel the employer pays for private journeys. The taxable value is the car’s list price multiplied by an appropriate percentage based on CO2 emissions and fuel type — 3% for a fully electric car in 2025–26, rising to 37% for the highest-emission vehicles.2GOV.UK. Calculate Tax on Employees’ Company Cars3GOV.UK. Work Out the Appropriate Percentage for Company Car Benefits (480: Appendix 2)
- Private medical insurance premiums paid by the employer.
- Beneficial loans — interest-free or low-interest loans where the total balance exceeds £10,000 at any point in the year. The taxable amount is the difference between interest at the official rate (3.75% for 2025–26) and whatever the employee actually paid.4GOV.UK. Beneficial Loan Arrangements (480: Chapter 17)
- Assets made available to employees for private use, valued as an annual percentage of market price or actual rental cost.
- Gym memberships, non-work-related professional subscriptions, and similar perks.
- Relocation expenses above the £8,000 tax-free threshold for qualifying moves.
Each benefit has its own calculation rules. The employer enters the total cost, subtracts anything the employee contributed towards it, and the resulting figure is the taxable value.5HM Revenue & Customs. How to Complete P11D and P11D(b)
Benefits You Don’t Need to Report
Trivial benefits are exempt if they meet all four conditions: the benefit cost £50 or less to provide, isn’t cash or a cash voucher, isn’t a reward for work or performance, and isn’t a contractual entitlement.6GOV.UK. Tax on Trivial Benefits
Other exemptions include expenses covered by a PAYE settlement agreement and benefits within statutory exemptions such as workplace parking, one mobile phone per employee, or employer pension contributions. If a perk’s status is unclear, reporting it is the safer choice.
Deadlines and Class 1A NIC
The tax year ends on 5 April. Three deadlines follow:
- 6 July — submit all P11D and P11D(b) forms to HMRC, and give each employee a copy of their P11D information.7GOV.UK. Expenses and Benefits for Employers: Deadlines
- 19 July — deadline to pay Class 1A National Insurance if paying by cheque.
- 22 July — deadline to pay Class 1A National Insurance if paying electronically.
The Class 1A rate is 15% of the total taxable value of all benefits reported on the P11D(b).8GOV.UK. National Insurance Rates and Categories: Contribution Rates The employer pays this in full; employees don’t contribute to Class 1A NIC on their benefits.
Submission is entirely digital. HMRC no longer accepts paper P11D forms. Employers with fewer than 500 employees use HMRC’s PAYE Online service; larger employers submit through compatible payroll software.9GOV.UK. Expenses and Benefits for Employers: Reporting and Paying A P11D(b) is still required even if you payroll every eligible benefit, because the Class 1A liability still has to be declared and paid.
Penalties for Late or Incorrect Filing
For late P11D forms, HMRC can seek a penalty of up to £300 per form through the First-tier Tax Tribunal, plus a further £60 per day until the employer corrects the situation. Penalties for a late P11D(b) are automatic: £100 for every 50 employees (or part thereof) for each month or part-month the return is overdue.
Late payment of Class 1A NIC attracts a 5% surcharge if the amount hasn’t reached HMRC by 22 August (30 days after the electronic payment deadline). That rises to 10% after six months and 15% after twelve months, with interest accruing daily on top.
Incorrect P11Ds carry penalties calculated as a percentage of the tax lost, depending on the employer’s behaviour: up to 30% for a careless error, up to 70% for a deliberate error, and up to 100% for a deliberate error with concealment. Voluntary disclosure before HMRC discovers the error reduces the penalty range significantly. These penalties are governed by the Taxes Management Act 1970.10GOV.UK. How to Complete P11D and P11D(b) – Section: Penalties
What Employees Should Do With Their P11D
Employers must give you a copy of your P11D information by 6 July after the end of the tax year.7GOV.UK. Expenses and Benefits for Employers: Deadlines HMRC uses the data to adjust your tax code for the following year. If a company car benefit is worth £9,000, HMRC reduces your tax-free allowance by that amount and spreads the extra tax across your monthly pay. In most cases there’s no separate bill; the adjustment flows through PAYE automatically.
Check the tax code notice carefully. Errors in the P11D feed straight through to your code, and an incorrect code means overpaying or underpaying tax for the entire year.
If you file a self-assessment tax return, your benefits in kind still need to be entered on it, using the figures from the P11D your employer provided. Leaving them off on the assumption that the tax code has already handled everything is a common mistake.
Payrolling Benefits Instead
Rather than filing P11Ds, employers can register to payroll benefits in kind. The taxable value is calculated and included in the employee’s monthly pay, with income tax collected through PAYE in real time. The employee sees the benefit on their payslip, and no P11D is filed for those benefits at year end.
Registration is through HMRC’s online service and has to be completed before the start of the tax year. Miss the window and you can’t start until the following April. You choose which benefits to payroll; the two you can’t currently payroll are employer-provided living accommodation and beneficial loans, which still go through the P11D.1GOV.UK. Payrolling Tax on Employees’ Benefits and Expenses Through Your Payroll Whichever route you take, a P11D(b) is still needed to account for Class 1A NIC.
Mandatory Payrolling From April 2027
Payrolling of benefits was originally set to become mandatory from April 2026, but in early 2025 the government pushed the date to April 2027 to give employers more time to prepare. From that date, most benefits in kind and taxable expenses will have to be reported through Real Time Information, with income tax and Class 1A NIC paid in real time through payroll software.11GOV.UK. Technical Note: Mandating the Reporting of Benefits in Kind and Expenses Through Payroll Software – An Update
The P11D won’t vanish entirely. HMRC will keep it temporarily for employer-provided accommodation and beneficial loans, with voluntary payrolling of those benefits becoming available from April 2027 and a timeline for making it mandatory to follow. Certain niche situations, such as globally mobile employees under modified PAYE arrangements, may also continue using P11D reporting.
Records to Keep
Employers must keep records supporting their P11D filings for at least three years from the end of the tax year they relate to. HMRC can inspect these records to verify that the right amount of tax was reported and paid.12GOV.UK. PAYE and Payroll for Employers: Keeping Records
In practice, that means holding onto invoices, lease agreements, insurance policies, mileage logs, loan agreements, and any calculations used to arrive at benefit values. If HMRC opens an enquiry and you can’t produce supporting documentation, you lose the ability to challenge their assessment. Three years is the minimum; six years is safer against late-discovery enquiries into careless or deliberate errors.