Pillar Guide · Updated June 2026
UK National Insurance Explained 2026/27
National Insurance is the second deduction on every payslip, the tax that quietly decides how much State Pension you will one day receive. Yet most people could not say what class they pay, what rate applies, or why it sits separately from income tax. This guide brings the whole 2026/27 picture together: Class 1 employee contributions at 8% and 2%, the 15% employer rate, Class 2 and Class 4 for the self-employed, what a qualifying year is and why you need 35 of them, how to fill gaps with voluntary contributions, and how NI differs from income tax. A worked example pulls the numbers together.
What National Insurance Actually Is
National Insurance (NI) is a tax on earned income that funds contributory benefits — most importantly the State Pension, but also statutory sick, maternity and paternity pay and contribution-based Jobseeker's Allowance. Unlike income tax, it is charged only on money you earn from employment or self-employment, not on savings, dividends or rental income, and it stops once you reach State Pension age.
The system is divided into classes. Class 1 covers employees and their employers; Class 2 and Class 4 cover the self-employed; Class 3 is voluntary. Which class you pay, and at what rate, depends on how you earn — which is where most of the confusion comes from.
Class 1: What Employees Pay
If you are employed, you pay Class 1 primary contributions, deducted at source through PAYE. For 2026/27 the rate is:
- 8% on earnings between the primary threshold (£12,570 a year) and the upper earnings limit (£50,270).
- 2% on all earnings above £50,270.
- Nothing on earnings below £12,570.
Note the quirk: the marginal NI rate falls from 8% to 2% once you pass £50,270, even as income tax climbs to 40%. NI is worked out per pay period for most employees, but on an annual basis for company directors. See exactly what comes out of your pay with the take-home pay calculator.
Employer National Insurance (15%)
Employers pay secondary Class 1 contributions at 15%on their employees' earnings above the secondary threshold. This is a cost borne by the business, not deducted from the worker — but it shapes the total cost of employing someone and, indirectly, wage levels.
The 15% rate and a lower secondary threshold make staff materially more expensive than they were. The Employment Allowance lets many smaller employers knock a fixed sum off their annual employer NI bill, so a small business often pays well below the headline figure. Employers can model the true cost with the employer NI calculator.
Class 2 and Class 4: The Self-Employed
Sole traders pay National Insurance through Self Assessment, not PAYE, and historically faced two charges:
- Class 4: a profit-based contribution charged on profits between the lower and upper profit limits, with a reduced rate on profits above the upper limit — broadly mirroring the employee 8%/2% structure.
- Class 2: a flat weekly contribution that built up State Pension and benefit entitlement. Following reform, self-employed people with profits above the small profits threshold are treated as having paid Class 2 with no actual charge, protecting their record; those below can pay it voluntarily.
The practical upshot: most profitable sole traders pay only Class 4 on their profits, while those with very low profits should consider paying voluntary Class 2 to keep their pension record intact. Estimate your bill with the self-employed tax calculator.
Qualifying Years and the State Pension
The whole point of National Insurance, for most people, is the State Pension. Entitlement is built up in qualifying years — tax years in which you paid or were credited with enough NI to count.
- You generally need 35 qualifying years for the full new State Pension.
- You need at least 10 qualifying years to get any new State Pension at all.
- The full new State Pension is around £241.30 a week in 2026/27.
Years can come from employment, self-employment, or NI credits. Your State Pension forecast on gov.uk shows exactly how many qualifying years you have and what you are on track to receive — the single most useful thing to check. The qualifying years guide goes deeper.
Voluntary Contributions and Credits
If you have gaps — from time abroad, low earnings or career breaks — you can often fill them and boost your pension. There are two routes, and you should always check your forecast first to be sure a top-up will actually help.
- Voluntary Class 3 (or Class 2): pay to make a past year qualify. You can normally fill the last six tax years; a single year's top-up can add a meaningful slice to your weekly pension for life, making it excellent value.
- NI credits: awarded — sometimes automatically, sometimes on application — while claiming certain benefits, caring, or receiving Child Benefit for a child under 12. Specified Adult Childcare credits let grandparents claim for looking after children.
Checking for missing credits is often more valuable than paying for contributions — you may be entitled to qualifying years you never claimed. See the voluntary NI guide.
National Insurance vs Income Tax
The two deductions on your payslip are easily confused but work quite differently:
| Feature | National Insurance | Income Tax |
|---|---|---|
| Charged on | Earned income only | Most income incl. savings, dividends, rent |
| Employee rates | 8% then 2% | 20% / 40% / 45% |
| Threshold | £12,570 primary threshold | £12,570 Personal Allowance |
| After State Pension age | Stops | Continues |
Add the two together and you get the true marginal rate on your earnings — for example a basic-rate employee faces 20% income tax plus 8% NI, an effective 28% on each extra pound.
Worked Example: An Employee on £35,000
Consider an employee earning £35,000 in 2026/27. Figures are illustrative.
- Earnings above the primary threshold: £35,000 − £12,570 = £22,430.
- All below the upper earnings limit (£50,270), so the whole slice is at 8%.
- Class 1 NI: £22,430 × 8% = £1,794 for the year.
- Employer NI is paid separately by the business at 15% on earnings above the secondary threshold — a cost on top of the £35,000 wage.
That £1,794 sits alongside the employee's income tax of roughly £4,486 (20% of the same £22,430), so NI is a substantial but smaller deduction. Run your own numbers with the take-home pay calculator.