UK National Insurance Explained — What You Actually Pay

UK National Insurance Explained: Class 1 Employee Rates and Thresholds

National Insurance Contributions (NICs) represent a significant payroll deduction for workers in the United Kingdom. While often grouped with standard PAYE income tax, National Insurance functions under entirely separate rules, thresholds, and calculations. Crucially, National Insurance is calculated per pay period (weekly or monthly) and is not cumulative over the course of the tax year.

This guide provides an in-depth explanation of how Class 1 National Insurance is calculated for the 2026/27 tax year, detailing the relevant thresholds, contribution percentages, and ways you can legally optimize your contributions.

What is National Insurance?

National Insurance is a system of contributions paid by employees, employers, and the self-employed. These payments build your entitlement to certain state benefits, most notably the State Pension, as well as funding the National Health Service (NHS).

To receive the full UK State Pension upon retirement, you typically need to accumulate 35 qualifying years of National Insurance contributions or credits.

2026/27 Class 1 Employee Thresholds

If you are employed by a company and earn a salary, you pay Class 1 National Insurance. The amount you pay depends on your earnings level within specific thresholds:

• Primary Threshold (PT): The point at which employees start paying National Insurance. For the 2026/27 tax year, this is set at £12,570 per year (£242 per week or £1,048 per month).
• Upper Earnings Limit (UEL): The maximum threshold up to which the main rate of National Insurance applies. For 2026/27, this is set at £50,270 per year (£967 per week or £4,189 per month).

Class 1 Employee National Insurance Rates

National Insurance rates operate on a band-like progressive system:

Employer National Insurance

In addition to employee deductions, employers must pay Class 1 Secondary Contributions on behalf of their employees. For 2026/27, employers pay secondary contributions of 13.8% on all employee earnings exceeding the Secondary Threshold.

How National Insurance is Calculated (Worked Examples)

Unlike income tax, National Insurance is calculated on a non-cumulative basis. Each pay period stands on its own.

Example 1: Annual Salary of £35,000 (Paid Monthly)

• Monthly Gross Pay: £2,916.67
• Monthly Primary Threshold: £1,047.50
• Earnings subject to NI: £2,916.67 - £1,047.50 = £1,869.17
• Monthly National Insurance (8% of £1,869.17): £149.53
• Annualized National Insurance: £1,794.40

Example 2: Annual Salary of £65,000 (Paid Monthly)

• Monthly Gross Pay: £5,416.67
• Monthly Primary Threshold: £1,047.50
• Monthly Upper Earnings Limit: £4,189.17
• Earnings taxed at main rate (8% on portion between PT and UEL):
  • £4,189.17 - £1,047.50 = £3,141.67
  • 8% of £3,141.67: £251.33
• Earnings taxed at upper rate (2% on portion above UEL):
  • £5,416.67 - £4,189.17 = £1,227.50
  • 2% of £1,227.50: £24.55
• Total Monthly National Insurance: £251.33 + £24.55 = £275.88
• Annualized National Insurance: £3,310.60

How to Reduce Your National Insurance Bill

Since National Insurance is calculated on your gross paycheck, there are few ways to reduce it. The most effective method is through Salary Sacrifice:

By contractually agreeing with your employer to swap a portion of your cash salary for a non-cash benefit—such as workplace pension contributions, a cycle-to-work bicycle, or an electric company car—you lower your overall gross taxable salary.

Because your salary is lowered, both your Income Tax and employee National Insurance liabilities are reduced. For basic rate taxpayers, salary sacrifice saves an additional 8% in National Insurance, while higher rate taxpayers save an additional 2% in National Insurance.