National Insurance Calculator
Tax Year 2026/27
Calculate your estimated employee National Insurance
contributions from your annual salary.
How Our National Insurance Calculator Works
Our National Insurance calculator helps you estimate how much employee National Insurance may be deducted from your salary during the 2026/27 tax year. Enter your annual salary to see an estimated yearly, monthly and weekly NI amount.
National Insurance is separate from Income Tax. Your NI contribution is based on your earnings and the employee contribution thresholds that apply during the tax year.
The calculator is designed for employees paying standard Class 1 National Insurance through payroll. Your actual deduction may differ if you have more than one job, receive bonuses, have irregular pay, or fall into a different National Insurance category.
National Insurance is normally deducted automatically through PAYE alongside Income Tax and other workplace deductions. It can therefore have a noticeable effect on the amount of salary you actually take home.
Please note: WeFixPay provides estimates for guidance only. Your actual National Insurance deduction may differ depending on your pay pattern, payroll category and individual circumstances.
Explore More UK Pay Calculators
Want to understand your full pay and deductions? Try our Salary Calculator, UK Tax Calculator and Pension Calculator for a broader breakdown of your earnings.
National Insurance Calculator FAQs
Does the calculator work across the UK?
Yes. Employee National Insurance rules generally apply across England, Scotland, Wales and Northern Ireland.
Does this calculator include Income Tax?
No. It focuses on employee National Insurance. Use the UK Tax Calculator to estimate Income Tax separately.
What type of National Insurance does it estimate?
The calculator is designed primarily for employees paying Class 1 National Insurance through payroll.
Why might my actual NI deduction be different?
Bonuses, irregular pay, multiple jobs, payroll categories and other circumstances can affect the amount deducted.
Is National Insurance included in take-home pay calculations?
Yes, National Insurance is one of the main deductions considered when estimating take-home pay in our Salary Calculator.
National Insurance Rates for 2026/27
For most employees paying standard Class 1 National Insurance, contributions are based on how much you earn during each pay period.
For the 2026/27 tax year, employees generally start paying National Insurance on earnings above £242 per week, or £1,048 per month. For a standard Category A employee, earnings between the Primary Threshold and the Upper Earnings Limit are charged at 8%.
The Upper Earnings Limit is £967 per week, or £4,189 per month. Earnings above this level are generally charged at the lower employee National Insurance rate of 2%.
This means National Insurance works in bands. Reaching the upper threshold does not mean all of your earnings are charged at a different rate — only the portion of earnings falling within each band is charged at the relevant rate.
National Insurance rules generally apply across the UK, including Scotland, even though Scotland has separate Income Tax bands. This is why your Scottish Income Tax may differ while your standard employee National Insurance calculation follows the same Class 1 contribution structure.
Your actual deduction can still vary depending on your National Insurance category letter, pay frequency, multiple jobs or other payroll circumstances.
For the official figures, check the UK Government’s National Insurance rates and thresholds.
Why Your National Insurance May Vary
Your National Insurance deduction may not be identical every month because it is normally calculated for each pay period rather than simply divided evenly across the year. Overtime, bonuses, extra shifts and changes in working hours can therefore affect the amount deducted from an individual payslip.
Your National Insurance category letter can also affect the calculation. Most employees use the standard category, but different rules may apply in some circumstances. If your actual deduction differs significantly from the estimate, check the National Insurance category shown on your payslip or speak to your payroll department.
Our National Insurance calculator gives you a useful estimate, but your payslip remains the best place to confirm the amount actually deducted.