HMRC NIC Calculator (Class 1 estimate)
Estimate employee and employer National Insurance Contributions for UK employment income using standard Category A style thresholds.
What this HMRC NIC calculator helps you do
If you are trying to estimate payroll costs in the UK, National Insurance can be one of the first numbers you need. This page gives you a practical HMRC NIC calculator for quick planning: enter your pay, choose weekly/monthly/annual frequency, and get an estimate for both employee NIC and employer NIC.
It is useful for employees checking payslip expectations, and for small business owners forecasting staff costs. It is not a replacement for payroll software, but it is ideal for fast decision-making.
How NIC works in simple terms
1) Employee NIC (Class 1 primary)
For most workers, employee NIC starts after the Primary Threshold (PT). Income between PT and the Upper Earnings Limit (UEL) is charged at the main rate, and income above UEL is charged at a lower additional rate.
2) Employer NIC (Class 1 secondary)
Employers pay NIC when pay exceeds the Secondary Threshold (ST). There is typically one main employer rate above this threshold.
3) Why your exact payslip may differ
- Payroll systems calculate NIC per pay period with HMRC rules and rounding conventions.
- Different NI category letters can apply.
- Directors can have annual earnings-period calculations.
- Employment Allowance and reliefs can alter employer liabilities.
Rates and thresholds used in this calculator
This tool uses a straightforward annualized estimate based on standard employed earnings assumptions:
- Primary Threshold (PT): £12,570
- Upper Earnings Limit (UEL): £50,270
- Secondary Threshold (ST): £9,100
- Employee main rate: 8%
- Employee upper rate: 2%
- Employer rate: 13.8%
These are common headline values used for quick budgeting. Always confirm against the latest HMRC guidance before filing or running payroll.
How to use this NIC calculator
- Enter gross pay amount.
- Choose whether that amount is weekly, monthly, or annual.
- Select the tax year.
- Set State Pension age status.
- Click Calculate NIC.
You will see:
- Annualized gross pay.
- Estimated employee NIC (annual and per selected pay period).
- Estimated employer NIC (annual and per selected pay period).
- Approximate pay after employee NIC only (before tax and deductions).
Example scenarios
Example A: £3,000 per month salary
Annual pay is £36,000. Employee NIC is charged on earnings above PT, while employer NIC is charged above ST. The calculator breaks down both annual and monthly estimated NIC, helping employees and employers model costs quickly.
Example B: £700 per week contract
Weekly inputs are annualized by multiplying by 52, then converted back to a weekly estimate. This provides a clean planning view even if actual payroll calculations differ slightly because of period-specific rounding.
When to use this tool vs payroll software
Use this page when you need:
- Fast budgeting
- Offer comparison
- Hiring cost estimates
- A quick “what if?” check
Use payroll software when you need:
- RTI submissions to HMRC
- Exact payslip compliance
- Multiple NI categories
- Director NIC methods
- Statutory pay and pension integrations
Frequently asked questions
Does this include income tax?
No. This calculator focuses on NIC only. Income tax, student loan, pension contributions, and other deductions are not included.
Does State Pension age affect NIC?
In many cases, employees at or above State Pension age do not pay employee Class 1 NIC, but employers may still owe employer NIC. This calculator reflects that high-level rule for estimates.
Can I use this for self-employment?
Not directly. Self-employed NIC (Class 4 and other considerations) uses different rules. This page is for standard employed Class 1 style estimation.
Final note
A good HMRC NIC calculator should be fast, clear, and practical. That is exactly what this tool aims to provide. For legal accuracy and submissions, always validate with official HMRC guidance or professional payroll/accounting advice.