Guidance
Work out an employee's National Insurance contributions
Use this calculator to work out employee National Insurance contributions, if you're an employee, employer, or a software developer.
This calculator will allow you to check how much in National Insurance contributions an employee needs to pay.
Using the calculator
If you’re an employee
Use the calculator to find out if the amount of National Insurance contributions you’ve paid is correct.
If you’re an employer
Use the calculator to find out how much National Insurance you need to deduct from your employees’ pay.
If you’re a software developer
Check the payroll software you have developed is calculating National Insurance contributions for employees and employers correctly.
Before you start
You’ll need:
- the period of pay, which could be:
- weekly
- every 2 weeks
- every 4 weeks
- monthly
- the date you were paid, if you’re an employee
- the date you paid your employee, if you’re an employer
- the amount paid before any deductions
- the employee’s National Insurance category letter — this can be found on the employee’s payslip
Published 20 December 2023