National Insurance Calculator (Class 1 & 4) UK
Calculate National Insurance contributions for employees and self-employed people at 2026/27 rates. Updated for the 2024 NI rate changes.
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National Insurance Guide 2026/27
What should I know about Class 1 Employee NI Rates 2026/27?
Employee Class 1 NI (deducted via PAYE): 0% on earnings up to £12,570/year (the Primary Threshold). 8% on earnings between £12,570 and £50,270 (cut from 12% via two staged reductions — to 10% in January 2024, then to 8% in April 2024). 2% on earnings above £50,270. Example: salary of £45,000 → NI = 8% × (£45,000 − £12,570) = 8% × £32,430 = £2,594.40. This 2024 change saved a typical employee approximately £450-750 per year, depending on salary, compared with the pre-2024 12% rate.
What do I need to know about Class 4 Self-Employed NI 2026/27?
Self-employed Class 4 NI (paid via Self Assessment): 0% below £12,570. 6% on profits from £12,570 to £50,270 (reduced from 9% from April 2024). 2% above £50,270. Class 2 NI (flat rate, previously £3.45/week) was abolished from April 2024 — self-employed people no longer pay Class 2, only Class 4. State Pension entitlement from Class 4: following the abolition of Class 2, self-employed people now accrue State Pension entitlement through Class 4 contributions — provided their profits are above the Lower Profits Limit for that tax year.
What's the key thing to understand about Employer Class 1 NI?
Employers pay secondary Class 1 NI on employee earnings above the Secondary Threshold (£9,100/year in 2026/27). Rate: 13.8% on all earnings above this threshold — there is no upper limit (unlike employees). An employee paid £30,000: employer NI = 13.8% × (£30,000 − £9,100) = 13.8% × £20,900 = £2,884/year. Employment Allowance: eligible employers can reduce their employer NI by up to £5,000 per year. Not available to single-director companies where the director is the sole employee. Employer NI is a real cost to the business on top of gross salary, which is why total employment cost is always higher than the salary figure alone.
What should I know about NI and State Benefits Entitlement?
NI contributions build entitlement to: State Pension (requires 35 qualifying years for full new State Pension — £221.20/week in 2026/27). Employment and Support Allowance. Maternity Allowance. Bereavement benefits. Check your NI record at gov.uk/check-national-insurance-record. Gaps in NI records can be filled voluntarily for years going back to 2006 (Class 3 voluntary contributions — £17.45/week in 2026/27). This can be extremely cost-effective: paying one year of voluntary contributions costs £907.40 (the Class 3 rate) but can add up to £329/year to the state pension for life — often recovering the cost within 3 years of retirement.
What's the key thing to understand about What National Insurance Actually Pays For?
National Insurance contributions (NICs) are a separate charge from income tax, calculated on earnings (or profits, for the self-employed) and paid into the National Insurance Fund, which historically funds specific contributory benefits rather than being a general tax like income tax. The most significant of these is the State Pension: your NI record — specifically the number of 'qualifying years' you've built up through paid or credited contributions — directly determines both whether you're entitled to a State Pension at all and how much you receive, with a set number of qualifying years required for the full amount. NI contributions also build entitlement to contributory Jobseeker's Allowance and Employment and Support Allowance, and historically funded statutory sick pay and maternity pay eligibility thresholds, though these have increasingly been administered through employers rather than directly from the NI system. Because gaps in your NI record (from time spent unemployed, self-employed below the threshold for contributions, living abroad, or caring for children without claiming the relevant credits) can reduce your eventual State Pension, it's worth periodically checking your NI record via HMRC's online service and considering voluntary contributions to fill gaps, particularly in the years approaching retirement.
What should I know about Employer vs Employee NI Contributions?
Both employees and employers pay National Insurance, calculated separately and at different rates, though only the employee's contribution is visible on a typical payslip since the employer's contribution is a separate cost borne by the business rather than deducted from the employee's pay. The employee pays a percentage of earnings above a primary threshold, with the rate applying within defined bands similar in structure to income tax. The employer separately pays a percentage on earnings above a (generally lower) secondary threshold, with no upper limit on the earnings this applies to, making it an ongoing cost of employment that grows with every pound of salary paid above the threshold — this is one reason salary sacrifice arrangements (exchanging salary for pension contributions, for example) can benefit both employee and employer, since both NI charges are reduced on the sacrificed amount. Self-employed people pay a different structure entirely (Class 2 and Class 4 contributions historically, with ongoing reform in this area), generally at a lower overall rate than employees, which is one of several reasons self-employment and employment aren't directly comparable purely by headline take-home pay — the self-employed also don't benefit from an employer's matching pension contributions or certain employment protections that NI-funded benefits partly support.
Worked Example: Employee NI on a £45,000 Salary
National Insurance for employees is calculated on earnings above the primary threshold, charged at the main employee rate up to the upper earnings limit, and at a lower rate above that. On an annual salary of £45,000, no NI is due on earnings up to the primary threshold (check the current annual equivalent, as it's typically published as a weekly or monthly figure). The main employee NI rate currently applies to earnings between the primary threshold and the upper earnings limit — for someone on £45,000, essentially all their NI-liable earnings fall within this band since £45,000 is below the upper earnings limit (which is typically set close to the higher-rate income tax threshold). This calculator applies the current thresholds and rates automatically, but it's worth understanding the structure: NI is not a flat percentage of total salary the way it might first appear, but a band-based charge similar in shape to income tax, just with different thresholds and rates — always check the current published rates and thresholds, since both are reviewed and can change each tax year.
Class 1 NI Structure at a Glance
National Insurance for employees and employers follows a threshold-based structure that resets each tax year.
| Band | Who Pays | Typical Treatment |
|---|---|---|
| Below Primary Threshold | Employee | No employee NI due |
| Between Primary Threshold and Upper Earnings Limit | Employee | Main employee NI rate applies (check current rate) |
| Above Upper Earnings Limit | Employee | Lower additional rate applies (check current rate) |
| Below Secondary Threshold | Employer | No employer NI due |
| Above Secondary Threshold | Employer | Employer NI rate applies (check current rate; typically no upper limit, unlike the employee charge) |
A key structural difference from employee NI is that employer NI typically has no upper earnings limit — the employer rate keeps applying to all earnings above the secondary threshold, however high the salary, which is one reason employer NI costs scale differently from employee NI costs as pay rises. Always verify current threshold and rate figures against HMRC's published tables for the relevant tax year, since all of these are reviewed and adjusted periodically.
National Insurance Categories Beyond Class 1
Most employees pay Class 1 National Insurance, calculated directly from salary as covered above, but several other classes exist for different circumstances. Class 2 historically applied to self-employed individuals as a flat weekly amount regardless of profit level, though recent reforms have changed or removed this requirement for many self-employed people — check current rules, as this area has seen notable policy changes. Class 3 is a voluntary contribution class that lets people fill gaps in their National Insurance record (for example, after a period not working or living abroad) specifically to protect their State Pension entitlement, since a minimum number of qualifying years is typically required for a full State Pension. Class 4 applies to self-employed profits above a threshold, calculated similarly in structure to employee Class 1 but at different rates and thresholds. Because State Pension entitlement depends on your NI record reaching a minimum number of qualifying years, it's worth checking your National Insurance record via HMRC periodically, particularly after any career break, self-employment period, or time spent working abroad, to catch and address gaps while voluntary Class 3 top-ups are still available for those years.