National Insurance Contributions Explained – Rates, Classes & Thresholds

Most UK workers see “National Insurance” on their payslip every month, yet few could explain exactly what it pays for or how the deduction is worked out. National Insurance Contributions It’s not just another tax — it’s tied directly to your future State Pension, certain benefits, and statutory pay entitlements.

This guide walks through everything you need to know about National Insurance Contributions: the different classes, current rates and thresholds, who pays what, and how it affects your take-home pay.

What Are National Insurance Contributions?

National Insurance Contributions (NICs) are payments made by employees, employers, and self-employed people in the UK. National Insurance Contributions HMRC collects them to fund the state pension, statutory sick pay, maternity pay, and certain other welfare benefits.

Unlike Income Tax, which goes into general government spending, National Insurance is more directly linked to your personal entitlement record. National Insurance Contributions Your NI contributions build up “qualifying years,” and you generally need a minimum number of these to receive a full State Pension later in life.

For most employees, NICs are deducted automatically through PAYE alongside Income Tax, so the two often get lumped together on a payslip even though they’re calculated separately.

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Why National Insurance Matters

It’s easy to see NI as just another deduction, but it directly affects:

• Your eligibility for the State Pension
• Entitlement to Statutory Sick Pay (SSP)
• Entitlement to Maternity, Paternity, and Shared Parental Pay
• Eligibility for Jobseeker’s Allowance (contribution-based)
• Your National Insurance record, which HMRC tracks over your working life

If you have gaps in your NI record — from years of low income or living abroad, for example — it can reduce your State Pension later. National Insurance Contributions That’s why understanding your contributions isn’t just payroll admin; it’s about your long-term financial position.

The Different Classes of National Insurance

National Insurance isn’t a single flat charge — it’s split into classes depending on your employment status and how much you earn.

Class	Who Pays It	What It’s For
Class 1	Employees earning above the threshold	Standard employee NI, deducted via PAYE
Class 1A	Employers	NI on certain employee benefits (e.g. company cars)
Class 1B	Employers	NI on PAYE Settlement Agreements
Class 2	Self-employed (below a certain profit level, voluntary in some cases)	Maintains State Pension entitlement
Class 3	Anyone with gaps in their NI record	Voluntary contributions to fill missing years
Class 4	Self-employed earning above a profit threshold	Additional NI based on profits

Class 1: The One Most Employees Pay

If you’re employed, Class 1 NI is deducted from your wages automatically. National Insurance ContributionsIt’s calculated based on how much you earn above a set threshold in each pay period.

Class 2 and Class 4: Self-Employed Contributions

If you work for yourself, National Insurance works differently. Class 2 contributions have effectively been phased out for most self-employed people with profits above the Lower Profits Threshold — meaning you’re credited for a qualifying year without actually paying Class 2, as long as your profits meet that threshold. Below that threshold, you can pay voluntarily to protect your State Pension record.

Class 4 NI applies on top of this, calculated as a percentage of profits above a set threshold, and is paid through Self Assessment.

Current National Insurance Rates and Thresholds (2025/26)

Threshold	Annual Amount	Meaning
Lower Earnings Limit (LEL)	£6,396	Below this, no NI is paid, but it can still count toward benefit entitlement in some cases
Primary Threshold (PT)	£12,570	Employees start paying Class 1 NI above this amount
Upper Earnings Limit (UEL)	£50,270	The point where the NI rate drops for earnings above it

Employee NI Rates (Class 1)

• 0% on earnings up to £12,570
• 8% on earnings between £12,570 and £50,270
• 2% on earnings above £50,270

A Worked Example

Say you earn £35,000 a year through PAYE employment.

• No NI on the first £12,570
• The remaining £22,430 (up to £50,270) is taxed at 8%
• NI owed: £1,794.40 per year, or roughly £149.50 a month

This is deducted automatically by your employer, alongside Income Tax, before you receive your net pay.

Employer National Insurance

Employers also pay National Insurance on top of an employee’s wages — a separate cost to the business that doesn’t reduce the employee’s pay. Employer NI is charged above the Secondary Threshold, a lower figure than the employee’s Primary Threshold, meaning employers start contributing sooner.

Self-Employed NI: Class 4 Rates

Profit Band	Rate
Up to £12,570	0%
£12,570 to £50,270	6%
Above £50,270	2%

Example for a Self-Employed Person

If you’re self-employed with profits of £40,000 a year:

• No Class 4 NI on the first £12,570
• The remaining £27,430 is charged at 6%
• Class 4 NI owed: £1,645.80 for the year

This is calculated and paid through your Self Assessment tax return, alongside Income Tax.

How National Insurance Is Calculated: Step by Step

Step 1: Identify your employment status
Are you employed, self-employed, or both? This determines which class applies.

Step 2: Check your earnings against the thresholds
Compare your gross pay (or profits, if self-employed) against the relevant threshold for your NI class.

Step 3: Apply the correct rate
Earnings below the threshold are NI-free. Earnings between the primary and upper thresholds are taxed at the standard rate. National Insurance Contributions Anything above is taxed at the reduced rate.

Step 4: Deduct or declare
For employees, this happens automatically through payroll. For the self-employed, it’s calculated and paid via Self Assessment.

National Insurance Categories (Letters)

Just like tax codes, National Insurance has category letters that affect how much is deducted.

Category Letter	Applies To
A	Most employees
B	Married women and widows with reduced NI election (rare now)
C	Employees over State Pension age (no employee NI due)
H	Apprentices under 25
M	Employees under 21
X	No NI due

Common National Insurance Questions People Get Wrong

Do I Pay NI on a Second Job?

Yes, NI is calculated separately for each job unless your employers coordinate through HMRC. National Insurance Contributions This can sometimes mean you pay slightly more NI overall, though you can apply for deferment if you have multiple jobs pushing you well above the Upper Earnings Limit.

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Do I Stop Paying NI at State Pension Age?

Yes. Once you reach State Pension age, you stop paying Class 1 or Class 4 National Insurance, even if you continue working. National Insurance ContributionsEmployers still pay their share, though.

Does NI Affect My State Pension Amount?

Your State Pension is based on your NI record — specifically the number of qualifying years you’ve built up. National Insurance Contributions You typically need a set number of qualifying years for the full new State Pension, and fewer years result in a reduced amount.

National Insurance vs Income Tax: Key Differences

Feature	National Insurance	Income Tax
Purpose	Funds State Pension and certain benefits	Funds general government spending
Based on	Earnings per pay period (employees) or annual profit (self-employed)	Total annual taxable income
Personal Allowance	No equivalent — has its own threshold	£12,570 tax-free allowance
Paid by	Employees, employers, self-employed	Anyone with taxable income
Stops at pension age	Yes (employee/self-employed NI)	No

How to Check Your National Insurance Record

You can check your NI record and see any gaps through your Personal Tax Account on GOV.UK. This shows:

• Your qualifying years so far
• Any gaps in your record
• Whether you can pay voluntary Class 3 contributions to fill those gaps
• Your forecasted State Pension amount

National Insurance Contributions If you’ve spent time abroad, been unemployed without claiming credits, or had very low self-employed profits in past years, it’s worth checking this regularly — gaps can often be filled retroactively, but usually only within a limited number of years.

Why Understanding Your NI Contributions Matters

Getting familiar with National Insurance Contributions helps you:

• Understand exactly what’s being deducted from your payslip and why
• Spot errors in your NI category or contributions
• Plan for retirement with a realistic picture of your State Pension entitlement
• Make informed decisions if you’re self-employed and managing your own tax and NI payments
• Decide whether voluntary contributions are worth making

FAQ’s