Class 1A National Insurance on benefits in kind is an employer-only charge of 15% on the taxable value of most non-cash perks you provide to employees and directors, from company cars to private medical cover. You report the benefits on form P11D and the total liability on form P11D(b) by 6 July after the tax year ends, then pay by 22 July if you pay electronically or 19 July by cheque.1GOV.UK. Rates and Thresholds for Employers 2026 to 20272GOV.UK. Expenses and Benefits for Employers Deadlines Employees pay nothing toward Class 1A; the liability sits entirely with you.
What Triggers the Charge
If a benefit is taxable under Income Tax rules and isn’t already caught by Class 1 National Insurance through payroll, it almost certainly attracts Class 1A.3GOV.UK. 2026 Class 1A National Insurance Contributions on Benefits in Kind, Termination Payments and Sporting Testimonial Payments The most common triggers are:
- Company cars available for personal use, and fuel provided for private journeys.
- Private medical insurance (the taxable amount is the premium you pay).
- Interest-free or low-interest loans above £10,000.
- Assets placed at an employee’s disposal for personal use, such as laptops or phones.
- Employer-provided living accommodation.
- Relocation expenses above the statutory exempt amount.
- Professional subscriptions to bodies not on HMRC’s approved list.
Two other categories are easy to miss. Non-contractual termination payments generate a Class 1A charge on the portion above £30,000 where that portion isn’t already subject to Class 1. A redundancy package of £45,000, for example, produces a Class 1A liability on £15,000.4GOV.UK. Pay Employers’ Class 1A National Insurance Non-contractual, non-customary sporting testimonial payments above £100,000 are also caught.3GOV.UK. 2026 Class 1A National Insurance Contributions on Benefits in Kind, Termination Payments and Sporting Testimonial Payments
What’s Exempt
Benefits exempt from Income Tax are generally exempt from Class 1A too. That covers employer pension contributions, workplace nurseries run on your premises, in-house sporting or recreational facilities, and anything provided solely for business use. Benefits already subject to Class 1 through payroll, or bundled into a PAYE Settlement Agreement, sit outside Class 1A as well.5GOV.UK. 2024 Class 1A National Insurance Contributions on Benefits in Kind, Termination Payments and Sporting Testimonial Payments
Small perks can also escape under the trivial benefits rule. A benefit qualifies as trivial only if it meets all four conditions: it cost £50 or less to provide (including VAT), it isn’t cash or a cash-equivalent voucher, it isn’t a reward for work or hitting a target, and it isn’t in the employment contract or provided through salary sacrifice. Go £1 over the £50 limit and the whole amount becomes taxable. Directors of close companies (those controlled by five or fewer shareholders) face an additional annual cap of £300 in trivial benefits per tax year.6GOV.UK. Tax on Trivial Benefits
Calculating What You Owe
The rate is 15% from the 2025/26 tax year onward, up from the previous 13.8%.7GOV.UK. Rates and Allowances National Insurance Contributions You apply it to the “cash equivalent” of each benefit, defined by the Income Tax (Earnings and Pensions) Act 2003. The core formula is the cost of providing the benefit minus any amount the employee pays toward it.8Legislation.gov.uk. Income Tax (Earnings and Pensions) Act 2003 Part 3 Chapter 10
That employee contribution point matters. If you provide private medical cover costing £1,200 a year and the employee reimburses £300, you owe Class 1A on £900. At 15%, that’s £135 instead of £180.
Some benefits use special measures. Company cars use a percentage of the car’s list price tied to fuel type and CO2 emissions, not what you actually paid.9GOV.UK. Calculate Tax on Employees’ Company Cars Benefits provided through salary sacrifice or optional remuneration arrangements use whichever is higher: the cash equivalent or the salary given up. Sum every individual benefit across every employee and the total is your Class 1A liability for the year.
Reporting: P11D, P11D(b), and Payrolling
Unless you payroll your benefits, you report them on two forms. Form P11D lists the individual benefits provided to each employee or director. Form P11D(b) is the summary that declares your total Class 1A liability.10GOV.UK. Expenses and Benefits for Employers Reporting and Paying Both are due by 6 July after the end of the tax year.2GOV.UK. Expenses and Benefits for Employers Deadlines HMRC requires you to keep the underlying records for three years from the end of the tax year they cover.11GOV.UK. Expenses and Benefits for Employers Record Keeping
If you need to correct a P11D(b) after submission, include the full corrected total rather than just the difference from the previous version.12GOV.UK. How to Complete P11D and P11D(b)
Payrolling is the alternative. You add the taxable value of each benefit to the employee’s monthly pay and deduct Income Tax through PAYE in real time, which removes the P11D obligation for those benefits. You have to register with HMRC’s online payrolling service before the tax year starts; miss that window and you can’t begin until the following year.13GOV.UK. Tax Employees’ Benefits and Expenses Through Your Payroll
Two categories currently cannot be payrolled: employer-provided living accommodation, and interest-free or low-interest loans. Those still go on a P11D even if you payroll everything else.13GOV.UK. Tax Employees’ Benefits and Expenses Through Your Payroll Payrolling also only removes the P11D. You still file a P11D(b) declaring your total Class 1A liability and pay by the usual July deadline.
From April 2027, payrolling most benefits will become mandatory. Accommodation and loans will remain voluntary to payroll during a transitional period, with P11D and P11D(b) retained for those categories.14GOV.UK. Technical Note Mandating the Reporting of Benefits in Kind and Expenses Through Payroll Software an Update
When to Pay
Electronic payments (BACS, Faster Payments, or CHAPS) must reach HMRC by 22 July after the end of the tax year. Cheque payments are due three days earlier, on 19 July.2GOV.UK. Expenses and Benefits for Employers Deadlines You’ll need the reference from your P11D(b) and you select the correct tax period on HMRC’s payment portal.
Miss the deadline and HMRC charges interest at the Bank of England base rate plus 4%, applied as simple interest from the day after the deadline until the payment clears. As of January 2026 that rate is 7.75% per annum, and it moves automatically with base rate changes.15GOV.UK. HMRC Interest Rates for Late and Early Payments
Penalties for Late or Inaccurate Filing
Missing the 6 July P11D(b) filing deadline triggers an automatic penalty of £100 for every 50 employees (or part of 50) for each month the form is outstanding. An employer with 120 staff faces £300 a month, and HMRC keeps charging until you file.
Inaccuracies carry a separate penalty calculated as a percentage of the tax HMRC lost through the error:
- Genuine mistake with reasonable care taken: no penalty.
- Careless error: up to 30% of the lost revenue.
- Deliberate error: up to 70%.
- Deliberate and concealed: up to 100%.
Most problems land in the “careless” band. HMRC doesn’t need to show you meant to get it wrong, only that you didn’t take reasonable steps to get it right. Guessed benefit values and thin records are what turn a no-penalty correction into a 30% charge, so keeping proper documentation through the year is the cheapest protection you have.