P11D Filing Guide for Employers: 2025/26 Deadline and Process

What Is the P11D?

Form P11D is the annual declaration that employers (and their payroll agents) submit to HMRC reporting the cash equivalent value of any taxable benefits and expenses provided to employees or directors during the tax year. It is a fundamental part of the PAYE system — while salary is taxed through payroll in real time, non-cash benefits require this separate annual return.

Each P11D covers one employee and lists every taxable benefit they received during the tax year, along with the corresponding cash equivalent value. HMRC uses this information to adjust employees' tax codes (collecting the income tax owed) and to calculate the employer's Class 1A National Insurance liability.

A P11D(b) is the companion form — essentially the employer's summary declaration and payment notification for Class 1A NI. All employers who submit at least one P11D must also submit a P11D(b).

Key Dates for 2025/26

Missing the 6 July deadline should be avoided. While HMRC's penalties for late P11Ds are less prescriptive than for PAYE RTI failures, persistent non-compliance or significant underpayment of Class 1A NI will attract interest charges and potentially a PAYE compliance investigation.

What Must Be Reported on a P11D?

The P11D has 14 sections (A to N), each covering a category of benefit or expense. The main sections employers need to consider:

Section A: Assets Transferred

Any asset transferred from employer to employee — for example, a laptop or a piece of equipment. The taxable value is the market value at the time of transfer, not the original cost.

Section C: Vouchers and Credit Cards

Employer-provided vouchers (retail, travel, etc.) or employer credit card use for personal expenditure. The taxable value is the face value of vouchers or the personal expenditure on the card.

Section D: Living Accommodation

The annual value of employer-provided accommodation (broadly, the rental value). Additional charges apply for properties costing over £75,000.

Section E: Mileage Allowance and Passenger Payments

Mileage reimbursements above HMRC's Approved Mileage Allowance Payments (AMAP) rates are taxable:

• First 10,000 business miles: 45p per mile (AMAP rate)
• Over 10,000 miles: 25p per mile
• Passenger payment: 5p per passenger per mile

If you reimburse employees at, say, 60p per mile for the first 10,000 miles, the excess 15p per mile is a taxable benefit and must appear on the P11D.

Section F: Cars and Car Fuel

This is typically the largest and most complex section. For each company car:

• Report the car's P11D value (list price including accessories, minus capital contributions up to £5,000)
• Report the CO2 emissions (determines the BIK percentage)
• Tick whether private fuel was provided (and if so, report the private fuel benefit using the standard figure × the BIK percentage)

The private fuel benefit cash equivalent for 2025/26 uses the multiplier of £27,800 (confirmed by HMRC). So a car with a 27% BIK rate has a private fuel benefit value of £27,800 × 27% = £7,506.

Section G: Vans

Private use of employer vans is taxable. The van benefit charge for 2026 is £4,020, and if the employer also pays for private fuel in the van, there is an additional van fuel charge of £769.

Genuine pool vans (shared between multiple employees, not kept at home overnight) are exempt.

Section I: Private Medical Treatment or Insurance

Report the gross cost of any private medical insurance premium paid by the employer. If family members are included on the policy, the whole premium is reportable.

Section L: Assets Made Available for Private Use

Any asset the employer makes available for the employee's private use — other than cars and vans — is taxable at 20% of the asset's market value per year, plus any additional running costs paid by the employer.

Section M: Other Items

A catch-all section including:

• Non-business entertainment
• Staff parties above the £150 per head annual exemption
• Personal incidental expenses above the daily limit (£5 UK, £10 overseas)

Class 1A National Insurance

Class 1A NI is employer-only National Insurance charged at 13.8% on the total P11D value of all taxable benefits provided. It is reported on the P11D(b) and paid to HMRC separately from regular monthly PAYE.

Calculation example:

• Total P11D values across all employees: £85,000
• Class 1A NI: £85,000 × 13.8% = £11,730
• Due by 22 July 2026 (if paying electronically)

Late payment of Class 1A NI attracts interest from 19 July. There is no additional flat-rate surcharge for minor delays, but HMRC's PAYE systems will automatically generate interest charges.

Optional Remuneration Arrangements (OpRA)

Since April 2017, OpRA rules have significantly changed the tax treatment of benefits delivered via salary sacrifice. The taxable value of a benefit under OpRA is the higher of:

1. The normal BIK value calculated under standard rules, OR
2. The amount of salary the employee has given up to receive the benefit

This means that for most benefits, salary sacrifice no longer saves income tax or employee NI. The key exemptions from OpRA (where salary sacrifice still works tax-efficiently) are:

• Pension contributions (employer contributions via salary sacrifice)
• Ultra-low emission vehicles (company cars with CO2 emissions below 75g/km)
• Cycle to Work (up to HMRC-approved limits)
• Childcare (employer-supported childcare; note this scheme is closed to new entrants)

If you have salary sacrifice arrangements in place for benefits other than these, you should review them carefully. The tax saving that made them attractive pre-2017 no longer exists under OpRA for most BIKs.

Common P11D Errors

Based on HMRC's published compliance guidance, the most frequent errors on P11D returns are:

1. Omitting the Private Fuel Benefit

Many employers forget that providing even occasional private fuel alongside a company car triggers the full-year private fuel benefit charge. There is no apportionment — once an employee uses the employer's fuel for one personal journey in the year, the entire annual charge applies (unless the employer has a formal process for reimbursing private fuel costs).

2. Incorrect P11D Value for Company Cars

Using the invoice price or finance amount instead of the actual P11D (list) price is a common mistake. The P11D value includes:

• Manufacturer's list price including VAT
• Delivery charges
• Number plates
• All accessories fitted at the time of ordering (excluding safety equipment) Less: capital contributions by the employee (capped at £5,000)

3. Missing Benefits for Directors

Directors are employees and must have P11D forms submitted in the same way as other employees. Small companies often overlook that a director's personal use of company assets, company-paid mobile phone (second phone), or company-paid expenses not wholly for business purposes are all reportable.

4. Forgetting Expenses Reimbursements

Not all reimbursed expenses are exempt. HMRC's PAYE Dispensation (now replaced by employer's duty of care provisions) allowed some employers to avoid reporting certain expenses, but this only applies where the expenses are wholly, exclusively, and necessarily incurred for business purposes and the employer has a robust checking procedure.

5. Section M: Miscellaneous Benefits

The catch-all Section M is frequently incomplete. Non-business entertainment, personal subscriptions paid by the employer, and staff events above the annual per-head exemption all need to be captured.

P11D Submission Methods

Employers can submit P11D returns:

1. HMRC's PAYE Online service — suitable for employers with fewer than 150 employees; submit each P11D individually via the government's portal
2. Payroll software with P11D module — most commercial payroll products include a P11D submission feature; produces the P11D(b) summary automatically
3. Third-party P11D software — specialist products designed specifically for P11D production (e.g., BenefitsPro, P11D Organiser)
4. Paper forms — strongly discouraged by HMRC; paper P11D and P11D(b) forms are still accepted but significantly slower to process

Whatever method you use, retain copies of all P11D submissions for at least 3 years after the tax year to which they relate — HMRC may open a compliance check within this window.

PAYE Settlement Agreements (PSA)

A PAYE Settlement Agreement (PSA) allows employers to settle the income tax and NI due on certain minor, irregular, or shared benefits in a single annual payment, rather than reporting them on individual P11D forms. This simplifies reporting for benefits such as:

• Staff Christmas gifts
• Irregular team meals or entertainment
• Small gifts for long service (where the exemption limit is not met)
• Shared benefits that are difficult to apportion between employees

HMRC must agree the PSA in advance (before 5 July following the tax year). The employer pays both the income tax and the NI due, calculated on a grossed-up basis. While a PSA involves more upfront calculation, it removes the need to report these items on individual P11Ds.

Payrolling Benefits: The Alternative to P11D

Since April 2016, employers have been able to payroll benefits in kind — that is, include the taxable value of benefits in the employee's monthly pay and collect income tax in real time via PAYE, rather than through year-end P11D adjustments.

From April 2026, payrolling of benefits has become mandatory for most employers, replacing the traditional P11D system for income tax purposes. However, the P11D(b) and Class 1A NI payment obligations remain unchanged — you still need to calculate and pay Class 1A NI on the total value of benefits, regardless of whether you payroll them or report them on P11D forms.

This is a significant administrative change for employers who have not yet transitioned. HMRC has published guidance on registering for payrolling of benefits via the PAYE Online portal.

Summary

P11D compliance is one of the more complex employer tax obligations, but following the right process and keeping accurate records throughout the year makes the year-end submission straightforward. The non-negotiable dates are 6 July 2026 for submissions and employee copies, and 22 July 2026 for electronic payment of Class 1A NI. The most common errors — missing private fuel benefit, incorrect car P11D values, and overlooked director benefits — are all avoidable with good record-keeping. If you are unsure about any benefit's treatment, HMRC's employment income manual provides detailed guidance, and a specialist payroll or benefits adviser can review your returns before submission.