Class 1A NIC Calculator

Total taxable value of all benefits in kind reported on P11D forms
Optional: enter the value of any benefits provided via salary sacrifice to compare NIC saving

Understanding Class 1A National Insurance Contributions

Class 1A National Insurance contributions are employer-only charges levied on most taxable benefits in kind. Unlike Class 1 NIC (which applies to cash earnings), Class 1A NIC applies to non-cash benefits provided to employees and directors, such as company cars, private medical insurance, and living accommodation.

The Class 1A NIC rate for 2025/26 and 2024/25 is 13.8%. This is applied to the total taxable value of all benefits as reported on employees' P11D forms. The employer calculates and pays this charge — employees do not pay Class 1A NIC, though they pay income tax on the benefit value via their tax code adjustment.

How to Calculate Class 1A NIC

The calculation is straightforward: multiply the total P11D benefits value by 13.8%. For example, if you provide benefits totalling £10,000 in taxable value, your Class 1A NIC liability is £1,380. This must be reported on form P11D(b) and paid by 19 July (or 22 July for electronic payment).

Frequently Asked Questions

What is Class 1A NIC?

Class 1A National Insurance contributions are paid by employers on most taxable benefits in kind provided to employees and directors. The rate is 13.8% of the total taxable value of benefits, calculated after the tax year ends. Class 1A NIC is reported on form P11D(b) and is distinct from Class 1 NIC on earnings.

When must Class 1A NIC be paid?

Class 1A NIC for a tax year must be paid by 19 July (or 22 July for electronic payments) following the end of the tax year. For example, Class 1A NIC for the 2025/26 tax year must be paid by 19 July 2026 (22 July 2026 for electronic payment). Late payment incurs interest and penalties.

What benefits attract Class 1A NIC?

Most taxable benefits in kind attract Class 1A NIC, including company cars, car fuel, private medical insurance, gym memberships, loans above £10,000, living accommodation, and non-cash vouchers. Some benefits are exempt, including employer pension contributions, childcare vouchers (legacy), and cycle-to-work scheme equipment. Benefits must be reported on form P11D.

How do I report Class 1A NIC on P11D(b)?

Class 1A NIC is reported on form P11D(b), which is the employer's declaration of total benefits provided and NIC due. The P11D(b) must be submitted to HMRC by 6 July following the tax year end. You total all benefits from your employees' P11D forms, apply the 13.8% rate, and declare the resulting NIC liability. P11D(b) can be submitted online via PAYE Online.

Can employers reclaim Class 1A NIC?

Employers generally cannot reclaim Class 1A NIC paid to HMRC. However, some employers include a clawback clause in employment contracts allowing them to recover the NIC cost from the employee if they leave within a specified period. Alternatively, employers can structure salary sacrifice arrangements to reduce benefit costs, though this affects the benefit's taxable value and NIC treatment.