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National Insurance Calculator (UK 2024/25)

वार्षिक पगार

What is National Insurance Calculator?

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National Insurance (NI) is a UK government contribution that funds the state pension, NHS, and other benefits. Employees pay Class 1 NI on their earnings; employers also pay Class 1 NI on each employee's wages. Self-employed workers pay Class 2 and Class 4 NI instead.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

How to National Insurance Calculator

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1Employee Class 1 NI 2024/25: 8% on £12,570–£50,270, then 2% above
2Employer Class 1 NI: 13.8% on earnings above £9,100 (secondary threshold)
3Both employee and employer NI fund state benefits separately from income tax
4NI contributions count toward state pension eligibility (35 years required for full pension)

Worked Examples

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Example 1

Given:£30,000 salary

परिणाम:Employee NI: £1,386/yr · Employer NI: £2,886/yr

Employee: (30,000−12,570) × 8% = £1,394

Example 2

Given:£60,000 salary

परिणाम:Employee NI: £3,007/yr · Employer NI: £7,044/yr

Above £50,270: only 2% NI on the excess

National Insurance Classes 2024/25

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Class	Who Pays	Rate	On What
Class 1 (employee)	Employees	8% / 2%	Earnings £12,570 – £50,270 / above
Class 1 (employer)	Employers	13.8%	Earnings above £9,100
Class 2	Self-employed	£3.45/week	If profit > £12,570
Class 4	Self-employed	9% / 2%	Profit £12,570 – £50,270 / above
Class 3	Voluntary	£17.45/week	Fill NI record gaps

Frequently Asked Questions

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What is National Insurance?

How accurate is the National Insurance calculator?

The calculator uses the standard published formula for national insurance. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the National Insurance calculator use?

This calculator works with inches, British pounds, percentages. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the National Insurance calculator use?

The calculator applies the standard formula for this type of calculation. See the 'How It Works' steps above for the detailed formula breakdown.

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Did you know?

The state pension age is rising to 67 by 2028 and is planned to rise to 68 between 2044–2046. The full new state pension (2024/25) is £221.20/week, or £11,502/year.

References

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Formula-verified for precision

Reviewed October 2026

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