UK NI Calculator 2025/26
Use this quick tool to estimate National Insurance contributions for employees (Class 1, Category A) or self-employed people (Class 4) for the 2025/26 tax year.
For planning and educational use only. Always verify with HMRC guidance or payroll software for exact liabilities.
What this NI calculator 2025 helps you do
If you have been searching for a National Insurance calculator UK 2025, this page gives you a practical estimate in seconds. Enter your gross annual income, choose whether you are employed or self-employed, and get a clear NI figure by year, month, or week.
It is designed for people who want quick planning answers before salary negotiations, contract changes, or freelance pricing decisions. You can also compare how NI changes as your income moves above key thresholds.
NI rates and thresholds used (2025/26 assumptions)
Employee NI (Class 1, Category A)
- Primary Threshold (PT): £12,570
- Upper Earnings Limit (UEL): £50,270
- Main rate: 8% between PT and UEL
- Upper rate: 2% above UEL
Self-employed NI (Class 4)
- Lower Profits Limit: £12,570
- Upper Profits Limit: £50,270
- Main Class 4 rate: 6% between limits
- Upper Class 4 rate: 2% above upper limit
Employer NI estimate
- Secondary Threshold: £5,000
- Rate: 15% above threshold
- This appears only when you select Employee mode.
How to use the calculator effectively
- Enter your expected gross annual pay or profit.
- Select Employee for payroll income or Self-employed for Class 4 estimation.
- Pick annual, monthly, or weekly display based on your budgeting style.
- If relevant, tick the State Pension age box for employee calculations.
- Click Calculate NI and review the full breakdown.
This tool focuses on NI only, so you can isolate one variable before adding income tax, student loan deductions, pension contributions, and other adjustments.
Worked examples
Example 1: Employee on £35,000
For a salary of £35,000, NI is charged mainly at the 8% band between the primary threshold and upper earnings limit. You can instantly see an annual amount and the monthly equivalent, which is useful for net-pay planning and understanding payslip deductions.
Example 2: Employee on £70,000
At higher salaries, NI is split across two bands: the main rate up to the UEL and 2% above it. This is why NI growth slows above the upper limit compared with the middle-income band.
Example 3: Self-employed on £45,000
Most NI falls into the Class 4 main rate band. This is useful for sole traders who want to set aside tax and NI each month to avoid surprises at self-assessment time.
Why this matters for take-home pay planning
Small percentage changes in NI can have a meaningful impact on yearly cash flow. If you are comparing two job offers, setting contractor day rates, or deciding on overtime, NI is one of the fastest ways to check your true marginal benefit.
- Use it during salary reviews to estimate post-deduction improvement.
- Use it in freelance pricing to avoid undercharging.
- Use it for household budgeting and emergency fund targets.
What this calculator does not include
- Income tax bands and personal allowance tapering
- Student loan repayments
- Pension salary sacrifice arrangements
- Scottish income tax differences (for total take-home calculations)
- Special NI categories and edge-case payroll adjustments
For final decisions, run a complete take-home pay projection or use professional payroll/accounting support.
FAQ: ni calculator 2025
Is NI the same as income tax?
No. They are separate deductions with different thresholds and rates. This calculator isolates NI so you can understand it clearly.
Can this replace my payslip?
Not exactly. Payroll systems can include additional adjustments and exact period-based calculations. This tool gives a strong estimate for planning.
Does NI stop at State Pension age?
Employee NI is often not due after State Pension age, which is why the calculator includes that option. Employer NI may still apply.
Is this useful for freelancers?
Yes. Set calculation type to Self-employed to estimate Class 4 NI and budget accordingly.
Final thoughts
A reliable NI estimate helps you make better money decisions quickly. Whether you are employed, self-employed, or comparing work options, this ni calculator 2025 gives you a clean starting point for realistic take-home planning.