National Insurance Calculator
Calculate NI contributions for employees and self-employed
1
Enter your total gross income before deductions
Enter your total annual income before any deductions. For employees, this is your gross salary (found on your payslip or P60). For self-employed, enter your total business profit (income minus allowable expenses). National Insurance is calculated differently from Income Tax - you start paying once you earn above £12,570 per year (the Primary Threshold).
£
2
Different NI classes apply based on employment status
Your employment type determines which National Insurance 'class' you pay. Employed (PAYE): You pay Class 1 NI, which is automatically deducted from your salary (12% on earnings £12,570-£50,270, then 2% above). Your employer also pays 13.8% on top. Self-Employed: You pay Class 2 (flat rate £3.45/week) plus Class 4 (9% on profits £12,570-£50,270, then 2% above) through Self Assessment.
How to Use This Calculator
Enter your annual gross income
Select employed or self-employed status
See your NI contributions breakdown
View employer NI costs (for employed)