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How is National Insurance Calculated on Salary? A Complete Guide for UK Employees and Employers

National Insurance (NI) is a fundamental part of the UK tax system, helping to fund state benefits, the NHS, and pensions. If you’re an employee, employer, or self-employed, understanding how National Insurance contributions (NICs) are calculated on salary is crucial to ensure compliance and efficient financial planning.

In this blog post, we’ll break down how National Insurance is calculated on salaries, who pays it, and what the upcoming changes mean for you. We’ll also provide expert tax planning tips and a call to action to help you minimize costs with Merranti Accounting.

1. What is National Insurance?

National Insurance is a mandatory tax in the UK that funds key government services such as:

  • State Pensions
  • NHS and healthcare funding
  • Maternity, paternity, and sick pay
  • Unemployment benefits and Universal Credit
  • Other state benefits and welfare programs

Both employees and employers contribute to National Insurance, but the amount varies based on salary, employment status, and tax category.

2. Who Pays National Insurance?

There are different types of National Insurance contributions (NICs) depending on employment status:

  • Employees: Pay Class 1 NICs, deducted from their salary by employers.
  • Employers: Pay Class 1 secondary NICs on behalf of employees.
  • Self-Employed Individuals: Pay Class 2 and Class 4 NICs based on profits.

Employees and self-employed individuals start paying National Insurance once their income exceeds certain thresholds.

3. National Insurance Thresholds and Rates (2024/25)

Key NIC Thresholds for Employees

As of the 2024/25 tax year, employees start paying National Insurance once their earnings exceed:

  • Primary Threshold: £12,570 per year (£1,048 per month or £242 per week).
  • Upper Earnings Limit: £50,270 per year (£4,189 per month or £967 per week).

Employee NIC Rates (Class 1)

Salary Band (Annual) NIC Rate
Up to £12,570 0% (No NICs Paid)
£12,571 – £50,270 10%
Above £50,270 2%

For example:

  • If you earn £30,000 per year, you’ll only pay NICs on £17,430 (since the first £12,570 is tax-free).
  • If you earn £60,000 per year, you’ll pay 10% NICs up to £50,270, then 2% on earnings above this threshold.

Employer NIC Rates (Class 1 Secondary)

Employers pay NICs on employee wages above £9,100 per year, at a rate of 13.8%.

  • Threshold: £9,100 per year (£758 per month or £175 per week).
  • Rate: 13.8% on wages above the threshold.

Example:

  • If an employee earns £30,000, their employer pays 13.8% on £20,900.
  • If an employee earns £60,000, the employer pays 13.8% on £50,900.

Employers also qualify for an Employment Allowance, which reduces the first £5,000 of employer NIC liability for eligible businesses.

4. How is National Insurance Calculated on Salary?

Step-by-Step Calculation Example

Let’s say an employee earns £40,000 per year.

Step 1: Identify Taxable Earnings for NICs

  • The first £12,570 is NIC-free.
  • The next £27,430 (£40,000 – £12,570) is taxable at 10%.

Step 2: Employee NIC Calculation

  • 10% on £27,430 = £2,743.
  • Total Employee NICs Paid: £2,743 per year.

Step 3: Employer NIC Calculation

  • Earnings above £9,100: £40,000 – £9,100 = £30,900.
  • 13.8% on £30,900 = £4,264.20.
  • Total Employer NICs Paid: £4,264.20 per year.

These calculations apply to monthly salaries as well, with NICs deducted via PAYE (Pay As You Earn).

5. How Does National Insurance Work for the Self-Employed?

Self-employed individuals pay two types of NICs:

  • Class 2 NICs: Fixed at £3.45 per week (if profits exceed £12,570).
  • Class 4 NICs: Based on profit levels:
    • 10% on profits between £12,570 and £50,270.
    • 2% on profits above £50,270.

Example:
A self-employed person earning £40,000 per year pays:

  • Class 2: £3.45 × 52 weeks = £179.40 per year.
  • Class 4: 10% on £27,430 = £2,743.

6. Upcoming National Insurance Changes (April 2025)

From April 2025, several changes will impact both employees and employers:

Employer NIC Rate Increases

  • Rising from 13.8% to 15% for wages above £9,100.
  • More expensive for businesses to employ staff.

Lower Employer NIC Threshold

  • The employer NIC threshold drops from £9,100 to £5,000.
  • Employers will pay NICs on more earnings.

Higher Employment Allowance

  • The Employment Allowance increases to £10,500.
  • More small businesses benefit from NIC reductions.

7. How to Reduce National Insurance Costs?

Employers and employees can use several tax planning strategies to reduce NIC liabilities:

For Employers:

  • Utilize the Employment Allowance: Reduces employer NIC liabilities.
  • Offer Salary Sacrifice Schemes: Employees can swap salary for pension contributions, cutting NICs.
  • Consider Freelancers or Contractors: Reduce Class 1 NIC liabilities.

For Employees:

  • Maximize Pension Contributions: Salary sacrifice pensions reduce NICs.
  • Use Workplace Benefits: Opt for tax-efficient healthcare and childcare benefits.

8. Key Takeaways on National Insurance Calculation

Employees pay 10% NICs on earnings between £12,570 and £50,270, then 2% above that.
Employers pay 13.8% on earnings above £9,100 (increasing to 15% in April 2025).
Self-employed NICs include fixed Class 2 and profit-based Class 4 contributions.
Upcoming changes in 2025 will increase NIC costs for businesses.

9. Get Expert National Insurance Advice with Merranti Accounting

Navigating National Insurance contributions (NICs) can be complex, and upcoming changes will increase costs for businesses and individuals.

At Merranti Accounting, we specialize in tax efficiency, payroll management, and financial planning.

Why Choose Merranti Accounting?
Expert Payroll & NIC Advice
Tax-Efficient Salary & Benefits Structuring
Employment Allowance Optimization
Self-Employed & SME Tax Planning

Get in touch today for a free consultation and optimize your National Insurance strategy!

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