Form P11Ds – Taxable Expenses and Benefits Explained.

If your business provides perks like company cars, medical insurance, or reimbursed expenses to employees, you’ll likely need to report them to HMRC using Form P11D. Each year, employers are required to declare certain taxable benefits and expenses that aren’t included in payroll. With clear reporting rules and deadlines to follow, it’s important to understand what applies to you.

In this article, we break down how Form P11D works for the 2025/26 tax year, what needs to be reported, and how to avoid common mistakes when submitting.

What is Form P11D?

Form P11D is used by UK employers to report taxable benefits and expenses provided to employees and directors that aren’t handled through payroll. These benefits – known as ‘benefits in kind’ – can include things like company cars, private health insurance, or interest-free loans.

You need to complete a separate P11D for each employee who received reportable benefits during the tax year. HMRC uses this information to adjust tax codes or assess whether further tax is due.

If you’ve payrolled certain benefits instead (meaning they were taxed through your regular payroll), you usually don’t need to include them on a P11D. However, you’ll still need to complete a P11D(b) to declare the total value of those benefits and pay any Class 1A National Insurance.

Not all benefits need reporting. Some business expenses are exempt if they meet HMRC’s conditions, and trivial benefits (usually under £50) may not require a return either. Knowing what to include – and what to leave out – is the first step toward accurate reporting.

Taxable Benefits and Expenses to Report

Not all expenses and benefits need to be reported – but many do. If your business provides non-cash perks or reimburses certain costs outside of payroll, they may need to be included on a Form P11D.

Common reportable benefits include:

• Company cars and fuel used for personal travel
• Private medical or dental insurance
• Low or interest-free loans over £10,000 (e.g. season ticket loans)
• Living accommodation provided by the business
• Goods and assets transferred to employees or made available for personal use
• Reimbursed expenses that don’t qualify for exemption
• Other non-salary perks such as gym memberships, childcare not covered by tax-free allowances, or paid subscriptions for personal services

Each benefit must be valued appropriately and recorded for the relevant employee. If you’re unsure whether something needs to be reported, it’s best to check HMRC guidance or speak to a payroll advisor.

Expenses must be wholly, exclusively and necessarily incurred for business purposes, and employers must have a valid exemption agreement in place (or rely on HMRC’s general exemption rules) for them to be excluded from P11D reporting.

P11D Deadlines and Penalties for 2025/26

For the 2025/26 tax year, the key dates for P11D reporting are:

• 6 July 2026 – Deadline to submit P11D forms to HMRC and provide copies to employees
• 6 July 2026 – Deadline to submit your P11D(b) declaration (summary of all benefits and Class 1A NIC due)
• 19 July 2026 – Deadline to pay Class 1A National Insurance (or 22 July if paying electronically)

Missing these deadlines can lead to penalties. HMRC currently charges £100 per 50 employees for each month or part-month that a P11D(b) is late. Interest and additional charges also apply if Class 1A NIC isn’t paid on time.

Inaccurate forms may result in further penalties, especially if HMRC believes reasonable care wasn’t taken. If you discover an error after submission, it’s important to correct it as soon as possible.

Changes for 2025/26

While the overall P11D process remains the same for now, there are a few updates and longer-term shifts employers should be aware of:

• Online filing is mandatory
  You must submit all P11D and P11D(b) forms digitally—paper forms are no longer accepted. This applies whether you file through HMRC’s PAYE Online service or via payroll software.
• Payrolling of benefits is becoming the norm
  HMRC plans to make payrolling most benefits mandatory from April 2027. That means future benefits in kind will be taxed through payroll as they arise, removing the need for annual P11Ds in many cases. For now, payrolling remains optional, but it’s worth considering if you want to get ahead.
• Benefit rules and thresholds unchanged (so far)
  There are currently no changes to the types of benefits that must be reported or the thresholds (such as the £10,000 limit for reportable loans or the £50 trivial benefit rule). However, it’s always worth checking HMRC updates after each Budget or fiscal announcement.

Looking ahead, employers are encouraged to review internal processes and consider how they’ll manage the eventual shift toward real-time benefit reporting.

P11D vs. P11D(b): What’s the Difference?

Although they’re closely linked, Form P11D and Form P11D(b) serve different purposes – and both may be required.

• Form P11D is completed for each employee or director who received taxable benefits or expenses not processed through payroll. It details what was provided and how much it’s worth.
• Form P11D(b) is completed once per employer. It summarises the total value of all reportable benefits and declares the Class 1A National Insurance due. It also confirms whether you’ve submitted any individual P11Ds.

Even if you’ve payrolled all benefits and don’t need to submit any P11D forms, you must still submit a P11D(b) to account for the Class 1A NIC. Submitting both forms correctly and on time ensures HMRC receives accurate information and that your NIC liabilities are settled properly.

Tips for Accurate Reporting

Getting Form P11D taxable benefits reporting right comes down to preparation and attention to detail. Here are a few practical tips:

• Start early – Keep track of benefits and expenses throughout the year, so you’re not rushing to pull everything together in June.
• Use the right valuation methods – Make sure you use HMRC’s rules to calculate the cash equivalent of each benefit. For example, company car values depend on CO₂ emissions and list price – not what you paid for it.
• Double-check employee details – Include the correct names, National Insurance numbers, and indicate director status where applicable.
• Be clear on what’s exempt – Don’t report reimbursed business expenses that qualify for exemption, and apply the trivial benefits rule where it fits. But don’t guess – check the conditions.
• Don’t forget the P11D(b) – Even if you’ve payrolled all benefits, you still need to submit this form to declare and pay Class 1A NIC.
• Ask employees to review their copy – Sharing P11D information with staff ahead of submission can help spot any errors and avoid confusion later.

Taking a methodical approach will help reduce the risk of mistakes, and the potential penalties that come with them.

What to Do Next

Form P11D reporting is a key part of year-end compliance for many UK employers. Knowing what counts as a taxable benefit, how to report it, and when to submit helps avoid errors, penalties, and last-minute stress. With changes on the horizon and deadlines to meet, it’s worth reviewing your process now – especially if you’re handling benefits manually or haven’t reviewed your approach in a while.

Whether you need help calculating benefit values, managing payroll software, or getting ahead of the 2027 payrolling changes, Nichols & Co are ready to help. Get in touch to make your next P11D submission stress-free.