What Is National Insurance and Why Do I Need It?

National Insurance is a system of contributions that funds key state benefits and your State Pension in the UK. If you're employed, self-employed, or running a business with employees, you'll need to understand how National Insurance works and why paying it matters for your future. This article explains the basics of who pays, how much, and what it covers.

What is National Insurance?

National Insurance (often abbreviated to NI) is a form of tax collected by HM Revenue and Customs (HMRC). When you pay National Insurance contributions, you're building up your entitlement to certain state benefits, including:

• The State Pension when you reach State Pension age
• Contributory Employment and Support Allowance (if you're unable to work due to illness or disability)
• Maternity Allowance
• Bereavement benefits

Unlike income tax, which funds general government spending, National Insurance has a more specific purpose: it creates a record of your contributions that determines what benefits you can claim.

Who needs to pay National Insurance?

You need to pay National Insurance if you're:

• Employed and earning above a certain threshold
• Self-employed and making a profit above a certain level
• An employer paying staff

If you're over State Pension age, you no longer pay National Insurance on your earnings, though your employer still pays employer contributions.

Employees under 16 don't pay National Insurance, and their employer uses a special category letter (X) on the payroll.

Class 1 National Insurance: employees and employers

Most people first encounter National Insurance as employees. This is called Class 1 National Insurance, and it has two parts:

Employee contributions are deducted automatically from your wages by your employer through the payroll system (PAYE). Employer contributions are paid on top of your salary by your employer directly to HMRC.

Employee contribution rates for 2026/27

For the tax year running from 6 April 2026 to 5 April 2027, most employees (category letter A) pay:

• 0% on weekly earnings up to £242 (or £1,048 per month)
• 8% on weekly earnings between £242.01 and £967 (or £1,048.01 to £4,189 per month)
• 2% on weekly earnings above £967 (or above £4,189 per month)

For example, if you earn £1,000 in a week, you'll pay nothing on the first £242, then £58 (8% of £725) on your earnings between £242.01 and £967, and £0.66 (2% of £33) on the remaining earnings above £967. Your total National Insurance payment for that week would be £58.66.

The lower rate of 2% on higher earnings means National Insurance becomes less of a burden as your income increases, unlike income tax which maintains higher rates.

Employer contribution rates for 2026/27

Employers pay National Insurance on their employees' earnings at a flat rate of 15% on most earnings above £96 per week (or £417 per month). This applies across nearly all earnings bands from £96 upwards, making it a significant cost for businesses.

National Insurance category letters

Your payslip will show a National Insurance category letter that determines how much you and your employer pay. Most employees have category letter A, but other categories exist for specific situations:

• Category C: Employees over State Pension age (employees don't pay, but employers still do)
• Category M: Employees under 21 (employees pay the standard rate, but employers have reduced liability)
• Category H: Apprentices under 25 (employers have reduced liability)
• Category J: Employees who can defer National Insurance because they're already paying it in another job
• Category B: Married women and widows with a certificate of election to pay reduced National Insurance

Special category letters (F, I, L, S, N, E, D, K) also exist for employees working in freeports or investment zones, which may offer different contribution rates.

Class 1A and Class 1B: National Insurance on benefits

If you're an employer providing benefits to your employees—such as company cars, private medical insurance, or other perks—you'll pay Class 1A National Insurance on the value of those benefits. For 2026/27, the rate is 15%.

Class 1A also applies to certain lump sum payments, including some redundancy payments.

Class 1B National Insurance is paid on expenses and benefits included in a PAYE Settlement Agreement (PSA), also at 15%.

Why paying National Insurance matters

The most important reason to pay National Insurance is to qualify for your State Pension. You need a certain number of "qualifying years" of National Insurance contributions to receive the full State Pension when you reach State Pension age.

Even if you're self-employed and don't have an employer deducting contributions, paying National Insurance protects your entitlement to these benefits. Missing years can create gaps in your National Insurance record that could reduce your State Pension or affect your eligibility for other contributory benefits.

Understanding your National Insurance on your payslip

If you're an employee, your payslip should show:

• Your National Insurance category letter
• The amount of National Insurance deducted from your pay that period
• Your year-to-date National Insurance contributions

You can check your National Insurance record online through your personal tax account on the HMRC website to see your contribution history and whether you have any gaps.

Sources

• National Insurance rates and categories

This article provides general guidance based on current HMRC rules. For advice specific to your situation, speak to your accountant.