HMRC NI Calculator
Estimate your UK National Insurance contributions using current standard thresholds for employees and self-employed workers.
This is an informational estimate only and does not replace HMRC guidance, payroll software, or accountant advice.
What this HMRC NI calculator does
This page gives you a quick estimate of National Insurance (NI) based on your annual income. If you are an employee, it estimates your Class 1 employee NI and also shows an estimated employer NI figure. If you are self-employed, it estimates Class 4 NI.
People usually search for an HMRC NI calculator when they want to understand payslips, compare job offers, plan freelance pricing, or estimate take-home pay before tax year-end. This tool is designed for exactly that: a simple, practical estimate you can use in minutes.
Quick NI basics (UK)
Employees
- You pay National Insurance on earnings above the Primary Threshold.
- A main NI rate applies up to the Upper Earnings Limit.
- A lower additional NI rate applies to earnings above that upper limit.
Self-employed
- Class 4 NI is charged on profits above the lower profits limit.
- A main rate applies between the lower and upper profits limits.
- A lower additional rate applies on profits above the upper limit.
Thresholds used in this calculator
The calculator uses standard rates/thresholds commonly referenced for recent UK tax years:
- Employee Class 1: Primary Threshold £12,570, Upper Earnings Limit £50,270, rates 8% and 2%.
- Employer Class 1: Secondary Threshold £9,100, employer rate 13.8%.
- Self-employed Class 4: Lower Profits Limit £12,570, Upper Profits Limit £50,270, rates 6% and 2%.
These are broad planning assumptions and may not reflect every payroll setup, category letter, relief, or legislative update.
How to use the calculator
- Enter your annual gross salary (or annual profit if self-employed).
- Choose your work status: employee or self-employed.
- Select the tax year and display frequency (year, month, or week).
- Click Calculate NI to view your estimated contribution.
Worked examples
Example 1: Employee on £30,000
Estimated employee NI is roughly £1,394.40 per year. Employer NI is roughly £2,884.20 per year. This gives a useful overview of personal deduction plus employment cost.
Example 2: Employee on £70,000
Estimated employee NI is about £3,410.60 per year, because part of earnings fall into the additional 2% band over the upper limit.
Example 3: Self-employed profit of £60,000
Estimated Class 4 NI is around £2,456.60 per year, combining the 6% main band and 2% additional band.
Ways people legally reduce NI exposure
- Salary sacrifice pension arrangements (where available and appropriate).
- Cycle to Work or other approved salary sacrifice benefits.
- Choosing optimal remuneration strategy for directors (with professional advice).
- Keeping accurate records if self-employed so profits are correctly reported.
Important limitations
No simple online estimator can cover every HMRC edge case. Your actual NI can differ due to:
- NI category letters (A, B, C, etc.)
- Directors’ annual method rules
- Irregular pay periods and payroll timing
- Contracted-out history or special employment situations
- Legislative changes after publication
FAQ
Does this include income tax?
No. This page focuses only on National Insurance. Income tax, pension deductions, and student loan repayments are separate calculations.
Is NI always calculated annually?
In real payroll, NI is generally assessed per pay period. This calculator gives an annualized estimate and then converts to monthly or weekly for easier planning.
Is this an official HMRC tool?
No. It is an independent educational calculator built to help with rough planning and understanding. Always verify with official HMRC guidance or qualified tax advice.