As a self-employed person in the UK, you pay National Insurance contributions (NICs) alongside income tax. Understanding the different classes, rates, and thresholds helps you plan your tax payments and ensure you are building up your State Pension entitlement.
Class 2 and Class 4 National Insurance
Self-employed individuals pay two types of National Insurance:
Class 2 NICs
Class 2 contributions are a flat weekly rate that entitle you to the State Pension, Maternity Allowance, and other benefits. From April 2024, most self-employed people no longer need to pay Class 2 NICs to build up benefit entitlement — this is now treated as paid if your profits exceed the Small Profits Threshold. However, you can still choose to pay voluntarily to protect your National Insurance record if your profits are below the threshold.
Class 4 NICs
Class 4 contributions are the main NI charge for the self-employed. They are calculated as a percentage of your annual profits between the Lower Profits Limit and Upper Profits Limit. Check the current rates on GOV.UK, as they are updated annually in the Autumn Budget.
How NI Is Paid
Both Class 2 and Class 4 NICs are calculated and paid through your Self Assessment tax return. They are collected alongside your income tax — you do not need to make separate NI payments. Under Making Tax Digital, your NI liability will be calculated through the Final Declaration process.
Reducing Your NI Bill
Class 4 NICs are based on your profits (income minus allowable expenses), not your gross turnover. This means every legitimate business expense you claim reduces both your income tax and your National Insurance bill. Make sure you are claiming all allowable expenses, including:
- Working from home expenses
- Mileage allowance
- Office supplies and software
- Professional fees
- Training and professional development
Track every expense with an AI receipt scanner to ensure nothing is missed. For record keeping requirements, see our guide to HMRC record keeping.
This article is for informational purposes only and does not constitute tax advice. Consult a qualified accountant or tax adviser for your specific situation.
