P11D and Benefits in Kind: What They Are and How Tax Is Collected
If your employer provides you with benefits beyond your salary — a company car, private medical insurance, an interest-free loan, gym membership, or other perks — those benefits are usually taxable. The mechanism for reporting and taxing them is the P11D form, submitted by your employer to HMRC each year. Understanding how P11D benefits work ensures you are neither overtaxed nor hit with unexpected bills.
What is a P11D?
A P11D is a form your employer submits to HMRC (by 6 July each year) listing the cash equivalent value of benefits and expenses they have provided to you during the tax year. Each employee who receives reportable benefits gets their own P11D. You should receive a copy of your P11D from your employer by the same deadline — keep it, because HMRC will use it to calculate any additional tax you owe.
The P11D(b) is the employer's summary form covering Class 1A National Insurance contributions (employer NI) on the benefits — that is the employer's liability, not yours.
Which benefits are reported on a P11D?
Common benefits that appear on a P11D include:
- Company cars: The taxable value is the car's list price multiplied by a percentage that varies with CO2 emissions (2%–37% for 2025-26). Electric cars currently attract 2%. A £35,000 petrol car at 30% CO2 rate = £10,500 taxable benefit.
- Private medical insurance (PMI): The taxable value is the cost to the employer of providing the policy. A £1,500 employer PMI policy creates a £1,500 P11D benefit.
- Beneficial loans: Employer loans above £10,000 at below the official HMRC interest rate (2.25% for 2025-26) create a taxable benefit equal to the notional interest difference.
- Living accommodation: Employer-provided housing is a taxable benefit unless it falls within specific exemptions (e.g. necessary for performing duties, such as agricultural workers or armed forces).
- Gym memberships: Employer-funded gym memberships for individuals (not open to all staff equally) are taxable.
- Vouchers and credit cards: Non-cash vouchers redeemable for goods or services, and credit cards used personally, generate taxable benefits.
Exempt benefits — what does NOT appear on a P11D
Many employer perks are exempt and do not need to be reported. These include:
- Employer pension contributions (not taxable as a benefit).
- Childcare vouchers issued before October 2018 (legacy scheme).
- Tax-Free Childcare payments via approved schemes.
- Canteen meals available to all employees.
- Mobile phones (one per employee).
- Workplace parking.
- Annual staff parties up to £150 per head.
- Trivial benefits up to £50 per occasion (not cash, not contractual).
How tax on P11D benefits is collected
There are two methods:
Method 1: Tax code adjustment (most common)
HMRC uses the P11D information to reduce your tax code, increasing the amount of tax deducted from your salary each month. For example, if you have a company car with a £10,000 taxable benefit and you are a basic rate taxpayer, HMRC reduces your tax code by 1000, meaning you pay an extra £2,000 tax over the year via PAYE (£10,000 × 20%).
Method 2: Self Assessment
If you complete a Self Assessment tax return, you declare benefits received and pay any additional tax through your return. This is common for higher earners who already file Self Assessment.
Payrolling benefits — the alternative to P11D
Employers can register with HMRC to "payroll" benefits — that is, include the taxable value of benefits in the employee's payroll each month rather than waiting for the annual P11D. This makes the tax real-time rather than delayed. If your employer payrolls your benefits, you will see the benefit value on your payslip and no separate P11D is required (except for employer-provided living accommodation and beneficial loans, which cannot currently be payrolled).
Frequently asked questions
What if my employer gets the P11D wrong?
If you believe your P11D contains errors — wrong car value, incorrect benefit amounts — contact your employer's payroll team first. If they cannot correct it, you can contact HMRC directly. An incorrect P11D that overstates your benefits will cause you to overpay tax; an understatement means HMRC may chase you for the difference later.
Does Class 1A NI on my P11D benefit affect me?
No. Class 1A NI is paid by your employer on the value of your benefits — it is their liability, not yours. You pay Income Tax on benefits (via PAYE code adjustment or Self Assessment), but not employee NI.