How to Fill Out and Submit Form P11D: P11D(b) and Class 1A NI

To fill out Form P11D, gather the taxable value of every non-payrolled benefit each employee received during the tax year, complete the relevant lettered sections of the form for that employee through HMRC’s PAYE Online service, and submit it alongside a single P11D(b) summary for your whole workforce by 6 July following the end of the tax year. Class 1A National Insurance on the reported benefits is then due by 22 July if paying electronically, or 19 July by cheque.1GOV.UK. Expenses and Benefits for Employers: Deadlines

What Goes on a P11D and What Doesn’t

A P11D reports benefits in kind: anything of value given to an employee outside their normal salary that carries a taxable value and hasn’t already been taxed through payroll. The common ones are company cars and fuel, private medical or dental insurance, beneficial loans where the balance topped £10,000 at any point in the year,2GOV.UK. P11D Working Sheet 4 – Interest-Free Loans and Low Interest Loans living accommodation, vouchers, employer-funded credit card spending, relocation costs above the £8,000 exemption, and personal use of employer assets.

Benefits already run through payroll do not need to appear on individual P11D forms. If every benefit an employee received was payrolled, you can skip their P11D entirely, though the employer still owes Class 1A National Insurance on those benefits and must file a P11D(b).3GOV.UK. Payrolling Tax on Employees’ Benefits and Expenses Through Your Payroll

Trivial benefits are exempt from reporting altogether. To qualify, the benefit must have cost £50 or less, must not be cash or a cash voucher, must not be a reward for work or performance, and must not be written into the employee’s contract. Benefits provided through a salary sacrifice arrangement never qualify. Directors of close companies (broadly, those run by five or fewer shareholders) also face an annual cap of £300 in trivial benefits per tax year.4GOV.UK. Tax on Trivial Benefits Routine business expenses that would have been fully deductible if the employee had paid them personally are also exempt.5GOV.UK. Expenses and Benefits for Employers: Exemptions and Dispensations

Information to Gather Before You Start

Open your records before you open the form. For each employee who received a reportable benefit, you need:

  • Their full legal name and National Insurance number, matched to your payroll records.
  • The dates each benefit was first made available, when it ended if applicable, and any mid-year changes.
  • The cash equivalent value of each benefit. For company cars this depends on list price and CO2 emissions; for loans it depends on the outstanding balance and HMRC’s official interest rate; for insurance it is the premium the employer paid.
  • Any amounts the employee paid toward the benefit, which reduce the reportable cash equivalent.

HMRC publishes working sheets for the harder calculations. Company cars, fuel, vans, loans, and accommodation each have their own worksheet that walks through the arithmetic. Complete the relevant working sheet first; the final figure transfers directly onto the P11D.

Working Through the Sections

The P11D is divided into lettered sections by benefit type, and you only complete the sections that apply to a given employee. Every section follows the same pattern: enter the gross value of the benefit, any amount the employee made good (paid back), and the resulting cash equivalent.

  • Section A: assets transferred to the employee, such as gifts of company property or long service awards.
  • Section B: payments made on the employee’s behalf, such as their council tax, personal bills, or National Insurance.
  • Section C: vouchers, credit cards, and tokens.
  • Section D: living accommodation.
  • Section E: mileage allowance payments above the approved rates.
  • Section F: company cars and car fuel.
  • Section G: company vans and van fuel.
  • Section H: beneficial loans.
  • Section I: private medical or dental insurance.
  • Section J: qualifying relocation expenses above the £8,000 threshold.
  • Section K: goods and other assets provided for private use.
  • Section L: use of employer-owned assets that are made available but not transferred.
  • Section M: other items, including education, directors’ tax paid by the company, non-qualifying relocation costs, and miscellaneous benefits.
  • Section N: expenses payments such as travel, entertainment, and other reimbursed costs.

The cash equivalent is what HMRC uses to adjust the employee’s tax code for the following year, so this figure has to be right.

The P11D(b) and Class 1A National Insurance

Every employer with one or more P11D forms to submit must also file a single P11D(b) covering the whole workforce.6HM Revenue & Customs. Service Issues – Online End of Year Expenses and Benefits Service – Section: Completing Form P11D(b) It summarises the Class 1A National Insurance owed on all reported benefits and serves as your formal declaration that all required returns have been filed.7GOV.UK. Expenses and Benefits for Employers: Reporting and Paying

For the 2026–27 tax year the Class 1A rate is 15%, applied to the total cash equivalent of all benefits that attract Class 1A liability.8GOV.UK. Rates and Thresholds for Employers 2026 to 2027 Not every benefit on the P11D carries Class 1A: some items in Sections B, C, and N are exempt from employer National Insurance even though they are taxable as income. The P11D(b) totals only the Class 1A-liable amounts.

If HMRC sent you a P11D(b) reminder but you have no benefits to report, you still need to respond, either by filing a nil return or contacting HMRC to confirm no Class 1A is due.

Submitting the Form

Employers with fewer than 500 employees file through HMRC’s PAYE Online service. Employers with 500 or more employees must submit through compatible payroll software.7GOV.UK. Expenses and Benefits for Employers: Reporting and Paying Paper filing is no longer accepted for most employers.

To use PAYE Online, log in to the Government Gateway with the employer credentials tied to your PAYE scheme. The portal walks through each section, lets you enter or upload benefit data, and generates the P11D(b) automatically once the individual forms are complete. Save the digital confirmation you receive after submitting; that is your proof of filing.

Giving Employees Their Copy

After filing, provide each employee with a record of the benefits reported on their P11D, including the cash equivalent of each item.9GOV.UK. Your P45, P60 and P11D Form This should go out by the 6 July filing deadline. Employees need it to check that their tax code will be adjusted correctly and to complete a self-assessment return if they file one. If an employee cannot get a copy from you, they can contact HMRC directly.

Deadlines, Penalties, and Fixing Errors

The tax year runs from 6 April to 5 April. P11D and P11D(b) forms are due by 6 July after the year ends. Class 1A National Insurance must be paid by 22 July for electronic payments or 19 July by cheque.1GOV.UK. Expenses and Benefits for Employers: Deadlines

Missing the filing deadline triggers an automatic penalty of £100 per 50 employees for each month or part-month the P11D(b) is late.1GOV.UK. Expenses and Benefits for Employers: Deadlines For a company with 200 employees, that is £400 for every month the return remains outstanding. Interest also accrues on any unpaid Class 1A National Insurance from the due date. Separate penalties apply to inaccurate returns, scaled by culpability from a lack of reasonable care through deliberate and concealed errors; voluntary disclosure typically reduces them.10GOV.UK. Penalties: An Overview for Agents and Advisers

If you spot an error after submitting, file an amended P11D through the same online service you used originally.11GOV.UK. Further Information, Feedback and Correcting Tax Returns If the corrected figures change the Class 1A liability, amend the P11D(b) as well. HMRC does not accept corrections by letter or phone.

Payrolling as an Alternative

Rather than reporting benefits after the tax year ends, employers can payroll them, deducting income tax on each benefit’s value through regular pay throughout the year. This removes the need to file individual P11D forms for any payrolled benefit.3GOV.UK. Payrolling Tax on Employees’ Benefits and Expenses Through Your Payroll You register with HMRC before the start of the tax year through the online payrolling service and choose which benefit types to include. Miss the registration window and you cannot start payrolling until the following year. Once registered, you cannot cancel mid-year.

Payrolling does not eliminate every obligation. You still file a P11D(b) to declare and pay Class 1A National Insurance on payrolled benefits, and you must send employees written notification by 1 June after the end of the tax year explaining which benefits were payrolled, their values, and confirming they will not be taxed twice.

Mandatory Payrolling From April 2027

From April 2027, most benefits in kind will have to be reported through Real Time Information, with income tax and Class 1A National Insurance paid in real time rather than through P11D forms after the year ends.12GOV.UK. Mandatory Payrolling of Benefits in Kind and Expenses – The Default Operation of Mandatory Payrolling Employment-related loans and accommodation will remain voluntary to payroll in the first year of the new system. Registering to payroll voluntarily before 5 April 2026 is a practical way to test systems and processes before the switch becomes compulsory.

Records to Keep

Keep the records that support every benefit reported on the P11D for three years from the end of the tax year they relate to.13GOV.UK. Expenses and Benefits for Employers: Record Keeping Records for the 2025–26 tax year must therefore be kept until at least 5 April 2029. That means invoices, lease agreements, insurance certificates, loan balances, mileage logs, and any employee reimbursement receipts. If HMRC opens an enquiry, clean records are the fastest way to close it.