How to Use the National Insurance Calculator UK
National Insurance is one of those deductions that quietly takes a significant chunk of your income, yet it's often overlooked when calculating your true take-home pay. This calculator gives you an instant, accurate breakdown of exactly how much NI you'll pay — whether you're employed or self-employed — for the 2026/27 tax year.
Start by selecting your employment type. If you're employed, enter your gross annual salary — the calculator will show your Class 1 employee NI, your employer's NI contribution (paid by them on your behalf), and your effective NI rate. If you're self-employed, enter your annual profits (after allowable expenses). The calculator shows your Class 4 NI contributions, confirms whether your Class 2 record is covered automatically, and gives your total NI bill and your profits after NI.
Detailed National Insurance Formula Breakdown
Class 1 (Employee) NI
If you're employed, you pay 8% on earnings between £12,570 and £50,270, and 2% on everything above £50,270. For a £60,000 salary: £37,700 (between £12,570 and £50,270) × 8% = £3,016, plus £9,730 (above £50,270) × 2% = £195. Total Class 1 NI: £3,211.
Class 2 (Self-Employed) NI
Class 2 NI is no longer a compulsory payment. Since April 2024, if your profits are above the Small Profits Threshold (£7,105 for 2026/27) you are treated as having paid Class 2 automatically — your State Pension record builds at no cost. If your profits are below £7,105, you can pay voluntary Class 2 at £3.65 per week (£189.80 per year) to protect your National Insurance record.
Class 4 (Self-Employed) NI
Self-employed people pay 6% on profits between £12,570 and £50,270, and 2% on profits above £50,270. For £45,000 profits: £32,430 (between £12,570 and £45,000) × 6% = £1,946 in Class 4 NI.
Employer NI
Your employer pays 15% on your earnings above £5,000 per year — both the rate (up from 13.8%) and the £5,000 secondary threshold (down from £9,100) took effect on 6 April 2025. For a £50,000 salary: £45,000 × 15% = £6,750 in employer NI. Eligible businesses can offset up to £10,500of their total employer NI bill with the Employment Allowance. This is a cost to your employer and part of your total employment package — it doesn't come out of your salary directly but affects what employers can afford to pay you.
Real-Life Examples
Example 1 — Employed, £35,000 Salary
On £35,000 as an employee, your Class 1 NI is: 8% of (£35,000 − £12,570) = 8% of £22,430 = £1,794 per year. That's about £150 per month. Your employer pays an additional 15% of (£35,000 − £5,000) = £4,500 in employer NI.
Example 2 — Self-Employed, £40,000 Profits
As a self-employed freelancer with £40,000 profits: Class 2 NI = £0 (treated as paid, since profits exceed £7,105). Class 4 NI = 6% of (£40,000 − £12,570) = 6% of £27,430 = £1,646. Total NI: £1,646. This is significantly less than an employee on the same income would pay, partly because self-employed people don't get the same contributory benefits (like Jobseeker's Allowance).
Example 3 — Employed, £85,000 Salary (Higher Rate)
On £85,000: NI at 8% on £37,700 (£50,270 − £12,570) = £3,016. NI at 2% on £34,730 (£85,000 − £50,270) = £695. Total Class 1 NI: £3,711 per year, or about £309 per month.
Key Things to Know About UK National Insurance in 2026/27
- Class 1 rate cut: The main employee rate was cut from 12% to 8% in January 2024 and remains at 8% for 2026/27. This puts roughly £450 back into the pocket of the average earner.
- Class 2 effectively abolished: Since April 2024, self-employed workers with profits above the Small Profits Threshold (£7,105 for 2026/27) no longer pay Class 2 — they are treated as having paid it, keeping full State Pension credits. Voluntary Class 2 (£3.65/week) remains available for those below the threshold.
- Class 4 rate cut: The self-employed Class 4 rate was cut from 9% to 6% in April 2024 and remains at 6% for 2026/27, saving the average sole trader roughly £700 per year.
- NI contributions count toward State Pension: You need at least 35 qualifying years of NI contributions to receive the full State Pension. Missing years can be filled with voluntary contributions.
- Employer NI rose in April 2025: From 6 April 2025 the employer (Class 1 secondary) rate increased from 13.8% to 15% and the secondary threshold dropped from £9,100 to £5,000, making it more expensive to hire. The Employment Allowance rose to £10,500 to help smaller employers offset the increase.
Data Sources & Methodology
Our National Insurance Calculator UK uses the official 2026/27 NI rates and thresholds from HM Revenue & Customs. All figures are verified as of July 2026.
- Class 1 (Employee) NI: Rates and thresholds from HMRC National Insurance Rates. 8% on earnings between £12,570–£50,270, 2% above £50,270.
- Class 2 (Self-Employed) NI: Treated as paid when profits exceed the £7,105 Small Profits Threshold; voluntary rate £3.65 per week, confirmed by HMRC Self-Employed NI.
- Class 4 (Self-Employed) NI: 6% between £12,570–£50,270, 2% above — from HMRC Class 4 NI.
- Employer NI: 15% on earnings above £5,000 (from 6 April 2025) per the HMRC Employer NI Guide.
How We Calculate: Class 1 NI = (Min(salary, UEL) − PT) × 8% + Max(0, salary − UEL) × 2%. Class 2 NI = £0 (treated as paid when profits exceed £7,105; voluntary £3.65/week below that). Class 4 NI = (Min(profits, £50,270) − £12,570) × 6% + Max(0, profits − £50,270) × 2%. Employer NI = (salary − £5,000) × 15%, less Employment Allowance (up to £10,500) for eligible businesses. All results are estimates — your actual NI may vary based on your exact employment circumstances and benefits in kind.
Frequently Asked Questions
Q: What is the current National Insurance rate in the UK?
A: For employees (Class 1): 8% on earnings between £12,570 and £50,270, and 2% above £50,270. For self-employed (Class 4): 6% on profits between £12,570 and £50,270, and 2% above £50,270. Class 2 is treated as paid at no cost when profits exceed £7,105.
Q: Do I pay National Insurance if I'm self-employed?
A: Yes. Self-employed people pay Class 4 NI (6% on profits between £12,570 and £50,270, 2% above) on their annual profits through Self Assessment. Class 2 is no longer a separate payment — profits above £7,105 earn a qualifying State Pension year automatically.
Q: What's the difference between Class 1, Class 2, and Class 4 NI?
A: Class 1 is paid by employees and deducted through PAYE. Class 2 is a flat weekly amount that is now treated as paid for most self-employed people (voluntary below £7,105 profits). Class 4 is a percentage of profits paid by self-employed people. Both employees and self-employed people get different benefits from their contributions. Use TheMetricApp.com for an instant, accurate result.
Q: How many years of NI contributions do I need for the full State Pension?
A: You need 35 qualifying years of NI contributions or credits to receive the full State Pension. If you have fewer than 35 years, your pension will be proportionally reduced. You need at least 10 qualifying years to get any State Pension at all.
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