National Insurance Contributions: Rates, Classes and Employer Responsibilities

National Insurance contributions (NICs) are an important part of the UK’s tax and social security system. They are paid by employees, employers and self-employed individuals according to their circumstances, earnings or profits.

For employers, understanding NI contributions UK rules is particularly important because employer National Insurance is an additional payroll cost on top of employees’ wages. Getting the calculation wrong can result in incorrect payroll deductions, underpayments to HMRC and additional administrative work.

The rates and thresholds can change between tax years, so businesses should always use the figures applicable to the relevant tax year.

For 2026/27, standard employee Class 1 NIC is generally 8% on earnings between £12,570 and £50,270 and 2% above £50,270. The standard employer Class 1 NIC rate is 15% above the £5,000 secondary threshold.

What Are National Insurance Contributions?

National Insurance contributions are payments made by workers and employers to support the UK’s social security system.

The type and amount of National Insurance paid depends on factors such as:

• whether someone is employed or self-employed;
• their earnings or profits;
• their National Insurance category;
• whether they qualify for a reduced or zero rate; and
• whether a particular National Insurance class applies.

For employees, Class 1 NIC is normally deducted from wages through PAYE, while the employer also pays a separate secondary Class 1 contribution.

For self-employed individuals, National Insurance is generally based on profits and is dealt with through Self Assessment.

National Insurance is separate from Income Tax, although both can be collected through an employee’s payroll.

National Insurance vs Income Tax: What Is the Difference?

Income Tax and National Insurance are different charges.

An employee may therefore have both Income Tax and employee NI contributions deducted from their pay.

The amounts do not necessarily move together because the thresholds and rates for Income Tax and National Insurance are separate.

What Are the National Insurance Classes?

There are several different classes of National Insurance.

Class 1 National Insurance

Class 1 is generally relevant to employees.

It has two main elements:

• Primary Class 1 NIC paid by the employee through deductions from pay.
• Secondary Class 1 NIC paid by the employer.

The employer is responsible for calculating and paying its secondary contribution through PAYE.

Class 1A National Insurance

Class 1A NIC generally applies to certain taxable benefits and expenses provided by employers.

For 2026/27, the Class 1A rate is 15%.

This means employers need to consider National Insurance not only when calculating salaries but also when providing taxable benefits.

Class 1B National Insurance

Class 1B NIC can apply where an employer has a PAYE Settlement Agreement covering certain expenses and benefits.

The Class 1B rate for 2026/27 is 15%.

Class 2 National Insurance

Class 2 relates to self-employed individuals.

From 2026/27, where self-employed profits are at or above the relevant Small Profits Threshold, Class 2 contributions are treated as paid rather than requiring a separate payment.

For profits below the threshold, voluntary Class 2 contributions may be available.

Class 4 National Insurance

Class 4 NIC is based on self-employed profits.

For 2026/27, self-employed individuals pay:

• 6% on profits above £12,570 up to £50,270;
• 2% on profits above £50,270.

Class 3 National Insurance

Class 3 contributions are voluntary contributions that can potentially be used to fill certain gaps in a person’s National Insurance record.

The 2026/27 Class 3 rate is £18.40 per week.

Whether voluntary contributions are worthwhile depends on an individual’s circumstances and their existing National Insurance record.

National Insurance Rates for Employees in 2026/27

For the 2026/27 tax year, standard Class 1 employee NIC for category A is:

These figures correspond to the primary threshold of £12,570 and upper earnings limit of £50,270.

Different National Insurance category letters can result in different rates, so employers should not assume that every employee has the same NIC calculation.

For example, special categories can apply to:

• employees under 21;
• apprentices under 25;
• veterans;
• employees in Freeports; and
• employees in Investment Zones.

The employee’s National Insurance category should therefore be correctly recorded in payroll.

Employer National Insurance Contributions in 2026/27

Company NI contributions are an important cost for employers. For standard category A employees in 2026/27, the employer Class 1 secondary NIC rate is 15% on earnings above the £5,000 secondary threshold, subject to the relevant rules and any available reliefs.

Because employer NIC can materially increase the cost of employing staff, businesses may benefit from reviewing strategies for reducing the impact of employer NI contributions while remaining compliant with the relevant rules.

The annual secondary threshold is:

£5,000

The weekly and monthly equivalents are:

• £96 per week;
• £417 per month;
• £5,000 per year.

Example of Company NI Contributions

Suppose an employee earns £30,000 during 2026/27 and the standard employer Class 1 rules apply.

The employer’s NIC calculation can be simplified as:

£30,000 − £5,000 = £25,000

At 15%:

£25,000 × 15% = £3,750

This is a simplified illustration. The actual payroll calculation can depend on pay frequency, category letter and other applicable rules.

Employers should also consider whether they qualify for Employment Allowance, which can reduce eligible employer Class 1 secondary NIC liabilities. For 2026/27, the maximum Employment Allowance is £10,500, subject to the eligibility rules.

What Is the Employer National Insurance Cost?

When calculating the true cost of employing someone, a business should consider more than the employee’s gross salary.

The overall employment cost can include:

• gross salary or wages;
• employer National Insurance;
• workplace pension contributions;
• statutory payments;
• benefits and expenses;
• holiday pay;
• recruitment costs; and
• other employment-related costs.

This is why employer NIC should be included when preparing staffing budgets and assessing whether a new hire is affordable.

For example, a salary that appears affordable when considered on its own may have a significantly higher total employment cost once employer NIC and pension contributions are included.

How Do Employers Calculate NI Contributions?

Payroll software normally calculates employee and employer National Insurance based on:

1. employee category;
2. pay frequency;
3. gross earnings;
4. applicable thresholds;
5. National Insurance rates; and
6. any relevant special rules.

Employers should ensure that payroll software is updated for the correct tax year.

For 2026/27, the standard Class 1 thresholds include:

These figures should not be confused with Income Tax thresholds.

What Are the Benefits of Paying National Insurance?

National Insurance contributions help maintain an individual’s National Insurance record and can affect entitlement to certain contributory benefits.

National Insurance records can be relevant to:

• State Pension entitlement;
• contribution-based benefits;
• certain maternity-related benefits; and
• other parts of the social security system.

Where someone is unable to make National Insurance contributions in the usual way, National Insurance credits may also help protect their qualifying record in certain circumstances.

However, the relationship between individual contributions and particular benefits is not simply a direct “payment in, benefit out” system. Eligibility depends on the relevant benefit rules and the individual’s circumstances.

Do Employers Pay National Insurance for Employees?

Yes.

An employer normally pays secondary Class 1 National Insurance on qualifying employee earnings above the applicable secondary threshold.

This is an employer cost and is separate from the employee’s own National Insurance deduction.

For example, if an employee has £2,500 deducted through payroll for employee NIC, this does not represent the employer’s NIC liability.

The employer calculates its own secondary contribution separately and includes it within its PAYE liabilities.

Do Company Directors Pay National Insurance?

Company directors who receive earnings from their company can be subject to Class 1 National Insurance.

Directors’ National Insurance calculations can differ from those of ordinary employees because directors’ NIC is generally calculated using an annual earnings basis, with specific rules for directors.

This is particularly important for owner-managed companies when deciding how to structure remuneration.

A director’s remuneration strategy may involve a combination of:

• salary;
• dividends;
• pension contributions; and
• other benefits.

Each element can have different tax and National Insurance consequences.

Businesses should therefore consider the overall position rather than choosing a remuneration method based on National Insurance alone.

National Insurance for the Self-Employed

Self-employed individuals do not normally pay employee Class 1 NIC on their trading profits. Instead, the relevant rules generally involve Class 2 and Class 4 National Insurance.

For 2026/27:

• the Small Profits Threshold for Class 2 purposes is £7,105;
• Class 2 is treated as paid where profits are at or above the relevant threshold;
• Class 4 applies where profits exceed £12,570;
• Class 4 is 6% between £12,570 and £50,270;
• Class 4 is 2% above £50,270.

Self-employed individuals generally deal with their National Insurance through Self Assessment. The position can become more complicated where a self-employed person carries on work outside the UK, so it is worth understanding how National Insurance works if you are working abroad.

Can You Make Voluntary National Insurance Contributions?

Yes, depending on your circumstances.

Voluntary National Insurance contributions may be relevant if you have gaps in your National Insurance record and want to improve your qualifying record.

Class 3 contributions are voluntary payments that can potentially fill certain gaps.

For 2026/27, the standard Class 3 rate is £18.40 per week.

However, paying voluntary contributions is not automatically beneficial for everyone.

Before making a payment, it is sensible to check your National Insurance record and whether paying the missing year would actually increase your entitlement.

How to Find Your National Insurance Number

Your National Insurance number is a personal reference used by HMRC and other government systems to identify your National Insurance record. If you cannot find your number in your existing records, learn how to apply for or locate a National Insurance number using the appropriate government service.

You may find it on documents such as:

• your payslip;
• P60;
• previous tax documents;
• National Insurance correspondence; or
• other official records.

If you cannot find your number, you can use the relevant GOV.UK service to retrieve it.

Your National Insurance number is sensitive personal information, so avoid sharing it unnecessarily.

National Insurance and Payroll

For employers, accurate payroll is one of the most important parts of managing NI contributions UK obligations.

A payroll process should ensure that:

• employees are assigned the correct NI category;
• earnings are processed using the correct thresholds;
• employee NIC is deducted correctly;
• employer NIC is calculated correctly;
• statutory payments are handled correctly;
• benefits are considered where relevant;
• PAYE liabilities are reconciled; and
• payroll records are retained.

Payroll errors can affect both the employee and the employer.

For this reason, businesses should review payroll processes whenever there is a change to rates, thresholds, employee circumstances or payroll software.

National Insurance and Benefits in Kind

Employers should also remember that some benefits provided to employees can create Class 1A National Insurance liabilities.

Examples can include certain:

• company cars;
• private medical benefits;
• beneficial loans; and
• other taxable employment benefits.

For 2026/27, the standard Class 1A rate on relevant expenses and benefits is 15%.

This means an employer’s National Insurance obligations are not limited to monthly salary processing.

National Insurance and Employment Allowance

Employment Allowance can reduce eligible employers’ secondary Class 1 NIC liability.

For 2026/27, the maximum allowance is £10,500.

The rules around eligibility changed for 2026/27, so businesses should check the current conditions rather than relying on older payroll guidance.

For eligible businesses, Employment Allowance can make a significant difference to the cost of employing staff.

However, the allowance should be claimed correctly through the payroll process and businesses should confirm that they meet the relevant conditions.

Common National Insurance Mistakes for Employers

1. Using outdated rates

National Insurance rates and thresholds can change between tax years.

Using an old percentage or threshold can result in incorrect payroll calculations.

2. Confusing employee and employer NIC

Employee NIC is deducted from the employee’s pay.

Employer NIC is an additional business cost.

They should be calculated separately.

3. Using the wrong NI category

Different employee circumstances can require different National Insurance category letters.

Using category A automatically for every employee can therefore lead to errors.

4. Forgetting benefits

Employers may focus on salary while overlooking Class 1A NIC on taxable benefits.

5. Ignoring directors’ rules

Director NIC calculations can operate differently from standard employee calculations.

6. Relying on old self-employed rates

Class 4 rates have changed over time. For 2026/27, the main rate is 6%, not the 9% rate stated in many older guides.

7. Failing to review payroll after changes

Changes to salary, employee status, benefits or payroll systems can affect National Insurance calculations.

National Insurance Contributions Checklist for Employers

Before finalising payroll, businesses should check:

• Are employee NI category letters correct?
• Is the payroll software using 2026/27 rates?
• Are employee NIC deductions correct?
• Has employer NIC been calculated separately?
• Are the correct thresholds being applied?
• Have directors been processed using the appropriate rules?
• Have taxable benefits been identified?
• Is Class 1A NIC being considered where applicable?
• Has Employment Allowance eligibility been checked?
• Are PAYE liabilities reconciled?
• Are payroll records retained?
• Have recent changes to employee pay or circumstances been reviewed?

National Insurance Rates: Quick Reference for 2026/27

These figures apply for the 2026/27 tax year and should be checked against current HMRC guidance when making payroll or tax calculations.

CASE STUDY: Helping a Wimbledon Employer Manage National Insurance Contributions

A growing employer contacted Cigma Accounting Wimbledon office after noticing that its payroll costs had increased and wanting to ensure its National Insurance contributions were being calculated correctly for the 2026/27 tax year.

The business employed a mixture of standard employees and company directors and had recently increased salaries for several members of staff. It also provided taxable benefits to some employees. The directors were unsure whether their National Insurance calculations should be treated in the same way as those for ordinary employees, while the finance team also needed to confirm whether the company could benefit from Employment Allowance.

Cigma Accounting reviewed the payroll setup, employee National Insurance category letters, applicable thresholds and employer Class 1 NIC calculations. The review also considered the treatment of directors and potential Class 1A National Insurance on taxable benefits.

The business was advised to update its payroll procedures for the 2026/27 rates and thresholds and introduce regular checks over employee and employer NIC calculations. Employment Allowance eligibility was also reviewed so that the company could claim the relief correctly if the relevant conditions were satisfied.

As a result, the business gained a clearer understanding of its total employment costs and had a more structured process for reviewing National Insurance whenever salaries, employee circumstances or benefits changed.

The case demonstrated why employers should treat National Insurance as an important part of payroll management rather than simply relying on standard software settings without review.