The P11D form explained, in plain terms

A P11D is the form an employer uses to report taxable benefits and expenses given to a director or employee that were not taxed through payroll, and it must reach HMRC by 6 July following the end of the tax year ^[1]. The employer National Insurance that falls due on those benefits, charged at 15% on the taxable value, is reported on a companion form and paid by 22 July ^[2].

Benefits in kind are the non-cash perks an employer provides on top of salary: a company car, private medical cover, a low-interest loan, certain gym memberships. They carry a cash value, which means they carry a tax cost, and the P11D is the mechanism that puts that value in front of HMRC where it has not already passed through the payroll. This guide sets out what the form covers, what it leaves out, the deadlines that surround it, and the shift to real-time payrolling that changes the picture from 6 April 2027.

Key takeaways

• A P11D reports taxable benefits in kind that were not put through payroll, one form per affected employee ^[1].
• The P11D(b) is a separate employer summary that declares the Class 1A National Insurance due, charged at 15% ^[2].
• The filing deadline is 6 July; the Class 1A payment deadline is 22 July ^[1].
• Trivial benefits costing £50 or less are exempt and need no P11D entry ^[3].
• From 6 April 2027 most benefits must be reported through payroll in real time, narrowing the P11D to loans and living accommodation ^[4].

What a P11D form is

The P11D is an end-of-year return that tells HMRC about expenses and benefits an employer has provided to a director or employee outside the normal payroll ^[1]. Where pay and most cash items run through PAYE and are taxed as they are paid, a benefit in kind such as a company car has historically sat outside that monthly cycle, so a separate annual return captures its value ^[5].

One P11D is completed for each employee who received a reportable benefit that was not payrolled. The form records the cash equivalent of each benefit, the figure HMRC treats as additional income, and that value feeds the employee's tax position, often through an adjustment to their tax code in a later year ^[6]. The employer does not collect income tax on the benefit at this stage; the P11D simply reports the value, and HMRC recovers the tax from the employee.

P11D and P11D(b): two forms, two jobs

The P11D rarely travels alone. It is paired with the P11D(b), and the two forms do different jobs that are easy to confuse. The table below sets out the split.

The Class 1A National Insurance on the P11D(b) is an employer-only charge, levied at 15% on the taxable value of the benefits, with nothing deducted from the employee for it ^[2]. That 15% rate matches the employer National Insurance rate that rose from 13.8% on 6 April 2026, so the cost of providing benefits moved up in step with the cost of paying salary ^[7]. Employers modelling the true cost of a benefit package should fold that 15% into the calculation, much as they do for employer National Insurance on wages.

Which benefits go on a P11D

Most non-cash perks with a private-use value are reportable. The table below lists the benefits that most often appear on a P11D and how each is treated.

How a company car value is worked out

The company car is the benefit that puts most P11Ds on the desk, and its cash equivalent follows a fixed formula: the car's list price, known as the P11D value, multiplied by an appropriate percentage set by the car's carbon dioxide emissions ^[9]. The P11D value is the list price including VAT and delivery, but not the first registration fee or road tax ^[9].

The appropriate percentage rewards low-emission cars heavily. A fully electric car attracts a 4% rate for the 2026-27 tax year, while a high-emission petrol or diesel car can reach into the high thirties, and every band rose by one percentage point for 2026-27 ^[6]. A £40,000 electric car at 4% therefore produces a cash equivalent of £1,600, on which the employer pays Class 1A National Insurance at 15%, around £240 ^[2].

Beneficial loans and other valued benefits

An interest-free or low-interest loan to an employee is a benefit in kind once the outstanding balance exceeds £10,000 at any point in the tax year, at which point the notional interest, the gap between HMRC's official rate and what the employee actually paid, becomes reportable ^[5]. Below the £10,000 threshold the loan is not reportable, which is why directors' loan accounts are watched closely around that line ^[1].

Other common entries include private medical insurance, valued at the premium the employer pays, and assets made available for private use ^[6]. Each carries its own valuation rule, but the principle is constant: the P11D records the cash the benefit is worth to the employee, and the Class 1A charge follows that figure ^[2].

What is exempt from P11D reporting

Not every perk lands on a P11D. A category of small or wholly business-related items is exempt, and knowing the boundaries saves needless reporting.

Trivial benefits

A benefit is trivial, and therefore exempt from both tax and reporting, when it costs £50 or less, is not cash or a cash voucher, is not a reward for work, and is not provided under a salary sacrifice or contractual arrangement ^[3]. A modest birthday gift or a bottle of wine typically qualifies, but if the cost exceeds £50 the whole amount becomes taxable, not just the excess ^[3].

A tighter rule applies to directors of a close company, where trivial benefits are capped at a total of £300 across the tax year ^[3]. Cash and anything convertible to cash always fail the test, so a cash bonus can never be trivial regardless of size ^[5].

Business expenses paid at HMRC rates

Genuine business expenses reimbursed at HMRC's approved rates are exempt and need no P11D entry ^[8]. This covers business travel and subsistence paid at benchmark rates, a business phone, professional subscriptions, and uniforms or tools required for the job ^[5]. Where the employer pays HMRC's benchmark rates, no exemption application is needed, and a formal agreement is only required for bespoke rates above the benchmarks ^[8].

The P11D deadlines and how to file

The P11D sits in a tight summer window with three dates that matter. Paper submissions are no longer accepted, so the forms go in online through HMRC's PAYE service or through payroll software ^[1]. The table below sets out the cycle for the 2026-27 tax year.

Software holding the HMRC Recognised badge files the P11D(b) electronically and calculates the Class 1A charge from the benefit values it already holds, which is why HMRC-recognised payroll software keeps the summer deadlines from becoming a manual exercise ^[4]. Accountants running benefits reporting across many client schemes manage the whole cycle from a multi-client payroll dashboard rather than form by form ^[1].

Penalties for late or incorrect P11Ds

A late P11D(b) carries an automatic penalty of £100 for every 50 employees, for each month or part-month the return is overdue, and interest runs on any Class 1A National Insurance paid late ^[2]. Errors carry their own exposure, because a P11D that understates a benefit can lead to an assessment and a separate penalty where the mistake was careless ^[1].

A correction is filed by submitting amended forms that restate the full position, not just the change, and a corrected P11D(b) must show the total Class 1A due rather than the difference ^[5]. Employers must keep the records behind each benefit for at least three years after the end of the tax year, so a later query can be answered from the underlying detail ^[10].

Payrolling benefits: the alternative to the P11D

Employers can sidestep the individual P11D by payrolling benefits, that is, by adding the cash value of a benefit to taxable pay each pay period so the income tax is collected in real time through PAYE ^[4]. Payrolling removes the need for a separate P11D for each payrolled benefit, but it does not remove the Class 1A charge, so a P11D(b) is still filed and the employer National Insurance is still paid ^[4].

Registration to payroll benefits voluntarily must be done with HMRC before the start of the tax year in which it begins, because a mid-year start is not allowed ^[4]. The value of each benefit then appears on the employee's payslip and flows through the Full Payment Submission, the same real-time channel that carries wages, which an HMRC-recognised payroll API handles as part of the regular pay run ^[4].

What changes from 6 April 2027

The P11D is on a path to a much smaller role. HMRC has confirmed that the reporting of most benefits in kind through payroll becomes mandatory from 6 April 2027, replacing the annual P11D for the majority of benefits with real-time reporting through PAYE ^[4]. From that point the income tax and the employer Class 1A National Insurance on most benefits are reported and paid through the payroll across the year rather than once each summer ^[4].

Two benefits stay outside the mandatory regime for now, employment-related loans and living accommodation, which can still be reported on a P11D after the change ^[1]. The final P11D cycle under the old rules covers the 2026-27 tax year, with its forms due by 6 July 2027, so the summer return does not disappear immediately, it narrows ^[4]. A one-person company managing a director's benefits through UK payroll software is well placed for the shift, because the payrolling mechanics are already built into real-time reporting.

Conclusion

The P11D has long been the annual reckoning for everything an employer gave staff outside the wage line, from the company car to the private medical plan, valued, totalled, and taxed once a year. The 15% Class 1A National Insurance and the tight July deadlines make it a return worth getting right, because the penalties for lateness accrue per month and per fifty employees without discretion.

Its centre of gravity is moving, though. As real-time payrolling becomes the default from 6 April 2027, the benefit-in-kind question shifts from a summer paperwork exercise to a line in every pay run, handled by the same software that already files PAYE and National Insurance. The P11D will not vanish, but for most employers it will shrink to a residual return for loans and accommodation, while the rest of the work moves into the monthly cycle where the pay already sits.

Frequently asked questions

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

A P11D is completed for each employee who received a non-payrolled benefit and reports the cash value of that benefit ^[1]. A P11D(b) is a single employer return that declares the total Class 1A National Insurance due across all benefits, payrolled or not, charged at 15% ^[2]. One reports the benefits, the other reports and triggers payment of the employer National Insurance on them.

Who needs to file a P11D?

Any employer that provided a taxable benefit in kind which was not put through payroll must file a P11D for each affected employee or director, plus a P11D(b) for the Class 1A charge ^[1]. An employer that payrolled all of its benefits still files a P11D(b), because the Class 1A National Insurance remains due even when the income tax was collected in real time ^[4].

What happens if a P11D is filed late?

A late P11D(b) attracts an automatic penalty of £100 for every 50 employees for each month or part-month the return is overdue, and interest is charged on any Class 1A National Insurance paid after the 22 July deadline ^[2]. Filing online and on time, and paying the Class 1A by the deadline, avoids both charges ^[1].

Will the P11D be abolished?

Not entirely, but its scope narrows sharply. From 6 April 2027 most benefits in kind must be reported through payroll in real time, which removes the annual P11D for the majority of benefits ^[4]. Employment-related loans and living accommodation remain reportable on a P11D for now, so the form survives in a reduced role rather than disappearing outright ^[1].