Class 2 National Insurance for the Self-Employed

Self-employed people in the UK pay two classes of National Insurance on their profits: Class 2 at a flat rate of £3.65 a week and Class 4 at 6% on profits above £12,570 ^[1]. Both are reported and settled through Self Assessment rather than through the PAYE system used by employees and employers. Understanding the distinction between the two, and the role the Small Profits Threshold plays in determining obligations, matters for anyone running their own business.

Class 2 is the smaller charge but carries the greater consequence for benefit entitlement. Without it, the State Pension qualifying year for that tax year is not earned. Self-employed people who also employ others operate two separate National Insurance obligations at once: their own Class 2 and Class 4 through Self Assessment, and their employees' Class 1 through PAYE.

Key takeaways

• Class 2 NI costs £3.65 a week and is treated as paid automatically for self-employed people with annual profits of £7,105 or more in the 2026-27 tax year ^[1].
• Below the £7,105 Small Profits Threshold, voluntary Class 2 contributions of £3.65 a week can protect State Pension entitlement and access to contributory benefits.
• Class 4 NI is charged at 6% on profits between £12,570 and £50,270, and at 2% above £50,270 ^[2].
• Class 2 protects entitlement to the State Pension, Maternity Allowance, contribution-based Employment and Support Allowance, and Bereavement Support Payment.
• Both classes are paid through Self Assessment; no separate arrangement is required for most self-employed people.

What Class 2 National Insurance is

Class 2 is a flat-rate weekly contribution levied on self-employed individuals. For the 2026-27 tax year, the rate is £3.65 a week ^[1]. It is entirely separate from Class 1, which employees and their employers pay on employment earnings, and from Class 4, which is profit-based rather than flat-rate.

The threshold that governs whether Class 2 is required is the Small Profits Threshold (SPT), set at £7,105 for 2026-27 ^[2]. A self-employed person whose annual profits reach or exceed £7,105 has Class 2 contributions treated as paid automatically within their Self Assessment return. No separate payment and no separate form are required. Those with profits below the SPT do not owe Class 2 NI but may pay it voluntarily to protect their benefit entitlements.

The Small Profits Threshold in practice

The SPT creates a meaningful line between obligation and choice. A self-employed photographer earning £4,800 a year sits below the £7,105 threshold ^[3]. Class 2 NI is not due, and the year will not automatically count as a qualifying year for the State Pension. Paying £3.65 a week voluntarily, around £190 over a full tax year, can secure that qualifying year and the contributory benefits that depend on it ^[4].

Self-employed individuals who are not registered for Self Assessment must contact HMRC separately to arrange voluntary Class 2 payments ^[4]. Those who are registered and want to pay voluntarily can include it in their annual return.

Class 4 National Insurance: the profit-based charge

Class 4 NI is calculated as a percentage of annual profits. The 2026-27 rates are ^[1]:

The Lower Profits Limit aligns with the income tax Personal Allowance of £12,570, meaning Class 4 NI and income tax begin at the same threshold ^[2]. A self-employed plumber with annual profits of £35,000 owes Class 4 NI of 6% on £22,430 (the excess above £12,570), totalling approximately £1,346.

Class 4 does not directly build entitlement to the State Pension or contributory benefits. That function belongs to Class 2. Both are calculated and paid through the Self Assessment return, with payment typically due by 31 January following the end of the tax year ^[5].

What Class 2 contributions protect

Each qualifying year of Class 2 NI contributions builds entitlement to a set of state benefits. These are distinct from the benefits available through Class 1 (employee) NI ^[6]:

Maternity Allowance is particularly significant for self-employed people expecting a child. The standard rate is £194.32 a week for up to 39 weeks ^[8]. Gaps in Class 2 NI can reduce that entitlement or remove it entirely if the 13-week minimum is not met.

Self-employed sole traders managing their own sole-trader payroll obligations alongside employees face dual NI compliance: Class 2 in the Self Assessment system and Class 1 employer NI through PAYE. The two systems are independent. HMRC-recognised payroll software for SMEs handles the Class 1 calculations for employees; the sole trader's own Class 2 and Class 4 remain a Self Assessment matter entirely separate from the payroll system.

How and when Class 2 NI is paid

For most self-employed people, Class 2 NI is collected as part of the Self Assessment payment on 31 January. Once the tax return confirms annual profits, HMRC calculates the Class 2 amount due and combines it with income tax and Class 4 NI in the year-end bill ^[5]. No action is required beyond filing the return accurately.

From 6 April 2026, individuals living or working abroad can no longer pay voluntary Class 2 NI to fill gaps for periods spent overseas. Only voluntary Class 3 contributions at £18.40 a week are available for overseas periods from that date onward ^[10]. Sole traders who work partly abroad should note this change when reviewing their NI position.

Small business owners wanting to understand the full picture of their payroll and NI obligations can consult payroll bureau software providers who manage both the employer PAYE side and advise on the self-employed SA side for owner-managed businesses.

For a broader overview of how employer NI interacts with the obligations of business owners who also pay themselves a salary, the article on understanding employer National Insurance covers the employer-side thresholds and rates in detail.

Conclusion

Class 2 National Insurance is the mechanism through which self-employed people in the UK build their State Pension record and preserve access to Maternity Allowance, contributory ESA, and Bereavement Support Payment. At £3.65 a week, it is the lowest-cost route to maintaining those entitlements. Above the £7,105 Small Profits Threshold, it is treated as paid automatically through Self Assessment; below it, voluntary payment is an active decision with measurable long-term returns.

The Class 4 charge on profits above £12,570, at 6% up to £50,270 and 2% above, is the larger tax cost for most self-employed people. The two classes serve entirely different purposes and must not be confused. For self-employed individuals who also employ staff, a clear payroll structure using UK payroll software separates the employee-side NI obligations from the self-employed person's own SA position.

Frequently asked questions

Does paying Class 2 NI guarantee a State Pension qualifying year for the self-employed?

Paying Class 2 NI throughout a full tax year counts as one qualifying year in the National Insurance record ^[1]. A qualifying year is one of the 35 required for a full new State Pension of £241.30 a week ^[7]. Qualifying years can be built from Class 2, Class 1, NI credits, and voluntary Class 3 contributions, and they do not need to be consecutive.

What happens if self-employed profits are below the Small Profits Threshold?

A self-employed person with annual profits below £7,105 is not required to pay Class 2 NI for the 2026-27 tax year ^[2]. That year will not count automatically as a qualifying year for the State Pension or contributory benefits. Voluntary Class 2 contributions of £3.65 a week can be paid to maintain entitlement, provided the person contacts HMRC to arrange payment if they are not registered for Self Assessment ^[4].

Do self-employed people pay Class 2 and Class 4 on the same profits?

Both Class 2 and Class 4 are calculated on self-employment profits and appear together in the Self Assessment return ^[1]. Class 2 is a flat £3.65 a week, treated as paid automatically above the £7,105 SPT. Class 4 is 6% on profits between £12,570 and £50,270, and 2% above £50,270. The two serve different purposes: Class 4 is a profits-linked charge; Class 2 is the gateway to contributory state benefits.

Can a self-employed person who employs staff pay both Class 2 and employer NI?

A self-employed individual who employs staff pays employer Class 1 NI on employee earnings through PAYE and pays their own Class 2 (and Class 4) through Self Assessment ^[3]. The two obligations are entirely separate and calculated on different bases. HMRC-recognised payroll software for SMEs handles the employee-side Class 1 calculations; the sole trader's own NI remains a Self Assessment matter outside the payroll system.