National Insurance UK — Smart Financial Analysis
Calculate UK National Insurance contributions. Employee, employer, self-employed. 2024/25 thresholds.
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Employees pay 8% on earnings between £12,570 and £50,270 (primary threshold to upper limit), and 2% on earnings above £50,270. Primary threshold: £12,570 (employee starts paying). Employees pay Class 1 NI at 8% (main) and 2% (upper rate) on their salary—deducted via PAYE. You need 35 years of NI contributions (or credits) to get the full new State Pension.
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Why: National Insurance (NI) is a UK tax on earnings and self-employed profits that funds state benefits including the State Pension, Jobseeker's Allowance, and the NHS. Both em...
How: Enter Employment Status, Annual Income (£), NI Category to get instant results. Try the preset examples to see how different scenarios affect the outcome, then adjust to match your situation.
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📋 Quick Examples — Click to Load
📊 NI Contribution Bands
📈 NI by Income
🍩 NI Class Split
📊 Employer vs Employee NI
For educational purposes only — not financial advice. Consult a qualified advisor before making decisions.
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National Insurance (NI) is the UK tax on earnings that funds the State Pension, NHS, and other benefits. Employees pay 8% on earnings £12,570–£50,270 and 2% above. Employers pay 13.8% on earnings above £9,100. Self-employed pay Class 2 (flat) and Class 4 (percentage). The primary threshold is £12,570 for 2024/25.
Sources: HMRC, GOV.UK, ONS, CIPP.
Key Takeaways
- • Employee NI: 8% on £12,570–£50,270, 2% above £50,270.
- • Employer NI: 13.8% on earnings above £9,100 (minus Employment Allowance if eligible).
- • Self-employed: Class 2 £3.45/week + Class 4 6% on profits £12,570–£50,270, 2% above.
- • 35 years of NI contributions needed for full State Pension.
Did You Know?
How Does National Insurance Work?
Class 1 (Employees)
Deducted via PAYE. No NI on first £12,570. 8% on £12,570–£50,270. 2% on earnings above £50,270. Different categories (A, B, C, H, J, M, V, Z) apply for reduced rates (e.g. under 21, apprentices).
Employer Contributions
Employers pay 13.8% on employee earnings above £9,100. Employment Allowance (up to £5,000) can reduce this for eligible employers. Not deducted from employee pay.
Class 2 and 4 (Self-Employed)
Class 2: £3.45 per week if profits ≥£6,725. Class 4: 6% on profits £12,570–£50,270, 2% above. Paid via Self Assessment.
Expert Tips
NI Classes Comparison
| Class | Who Pays | Rate |
|---|---|---|
| 1 | Employees & employers | 8% / 2% + 13.8% |
| 2 | Self-employed | £3.45/week |
| 3 | Voluntary | £17.45/week (2024/25) |
| 4 | Self-employed | 6% / 2% |
Frequently Asked Questions
What is National Insurance?
National Insurance (NI) is a UK tax on earnings and self-employed profits that funds state benefits including the State Pension, Jobseeker's Allowance, and the NHS. Both employees and employers pay NI. There are different classes: Class 1 (employees/employers), Class 2 and 4 (self-employed), Class 3 (voluntary).
How much NI do I pay?
Employees pay 8% on earnings between £12,570 and £50,270 (primary threshold to upper limit), and 2% on earnings above £50,270. Employers pay 13.8% on earnings above £9,100 (secondary threshold). Self-employed pay Class 2 (£3.45/week if profit ≥£6,725) plus Class 4 (6% on profits £12,570–£50,270, 2% above).
What are the NI thresholds 2024/25?
Primary threshold: £12,570 (employee starts paying). Secondary threshold: £9,100 (employer starts paying). Upper earnings limit: £50,270 (2% rate above this). Class 2 threshold: £6,725. Class 4 lower limit: £12,570; upper limit: £50,270. These apply to the 2024/25 tax year.
Employer vs employee NI: what's the difference?
Employees pay Class 1 NI at 8% (main) and 2% (upper rate) on their salary—deducted via PAYE. Employers pay an additional 13.8% on employee earnings above £9,100. This is a separate cost to the employer on top of the salary. Total employment cost = salary + employer NI.
How does NI relate to the State Pension?
You need 35 years of NI contributions (or credits) to get the full new State Pension. Years with insufficient contributions can be filled by Class 3 voluntary contributions. Self-employed Class 2 and 4 count toward the State Pension. Check your NI record at gov.uk.
What are the NI classes explained?
Class 1: Employees and employers (main NI). Class 2: Self-employed flat rate (£3.45/week) if profits ≥£6,725. Class 3: Voluntary contributions to fill gaps. Class 4: Self-employed percentage on profits (£12,570–£50,270 at 6%, above at 2%). Classes 1A/1B apply to benefits and some employers.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes. NI rates and thresholds change annually. Always verify with HMRC or a tax professional. Not financial or tax advice.
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