Enter gross pay
Use pay before employee deductions.
← All calculatorsEMPLOYEE NI CALCULATOR
Estimate employee National Insurance
Calculate the indicative employee National Insurance deduction for the selected tax year.
HOW THIS CALCULATOR WORKS
A useful estimate starts with the right inputs.
This calculator estimates employee Class 1 National Insurance using gross pay, pay frequency and the category selected. Contributions are normally calculated for each pay period, so the production engine should retain period-specific thresholds and rounding.
Select pay frequency and category
These determine the thresholds and rates the calculator should apply.
Review the deduction
See the annual estimate, monthly equivalent and effective NI rate.
UNDERSTAND YOUR RESULT
What the numbers are telling you.
Annual employee NI
The estimated contribution across the year under the selected assumptions.
Monthly employee NI
A useful comparison figure; actual pay-period deductions may vary.
Effective NI rate
Employee NI as a percentage of the gross pay entered.
BEFORE YOU ACT
Important points the headline number cannot decide.
- ✓NI is calculated per pay period rather than as a final annual tax reconciliation
- ✓Category letters affect the rates applied
- ✓Multiple employments are normally assessed separately
- ✓Director National Insurance can use an annual earnings method
PAYROLL CLARITY
Get payroll support →Need to check the full payroll result?
A payroll professional can review PAYE, National Insurance, pensions and reporting together rather than in isolation.
COMMON QUESTIONS
What to know before relying on the estimate.
Is National Insurance the same as Income Tax?+
No. They use different thresholds and rules. This calculator focuses on employee National Insurance, not the full PAYE deduction.
What if I do not know my NI category?+
Most employees use category A, but age, apprenticeship, veteran and other conditions can change the category. Check your payslip or ask payroll before relying on the estimate.
Is this calculation tax advice?+
No. It is an indicative estimate based on the information entered and the rules configured for the selected tax year. Your final position can change because of other income, reliefs, benefits, residence status and personal circumstances.
NEED CERTAINTY?
Speak to a tax expert →Make the next decision with confidence.
A vetted tax professional can check the assumptions and help you act on the result.