If you operate as a sole trader or partner in a business partnership in the UK, you pay National Insurance Contributions (NICs) on your net self-employed profits via your annual Self Assessment Tax Return.
Under recent HMRC tax reforms, mandatory Class 2 National Insurance was abolished for self-employed individuals earning above the Small Profits Threshold. Self-employed workers now pay Class 4 NICs on profits above the Lower Profits Limit, while receiving free Class 2 National Insurance credits to protect their UK State Pension entitlement.
⚙️ Rules & Thresholds
- Class 2 National Insurance Rules (2026/27):
- Profits Above Small Profits Threshold (£6,725): Mandatory Class 2 payments abolished (£0.00 payable). You automatically receive a Class 2 credit treating National Insurance as paid for State Pension purposes.
- Profits Below £6,725: You can pay Voluntary Class 2 NICs (£3.45 per week / £179.40 per year) to fill gaps in your State Pension record.
- Class 4 National Insurance Thresholds & Rates (2026/27):
- Lower Profits Limit (LPL): £12,570 per year (0% NIC below this threshold).
- Upper Profits Limit (UPL): £50,270 per year.
- Main Class 4 Rate: 6% on net profits between £12,570 and £50,270.
- Upper Class 4 Rate: 2% on net profits exceeding £50,270.
📊 Practical Examples
- Annual Net Profit: £38,000.00
- Lower Profits Limit (LPL): £12,570.00
- Taxable Profit Subject to Class 4 NIC: £38,000 - £12,570 = £25,430.00
- Class 4 Main Rate (6%): £25,430 × 6% = **£1,525.80 / year**
- Class 2 NIC Status: Abolished (£0.00 payable, State Pension credit granted)
Total National Insurance Liability: **£1,525.80 / year**
Effective NI Rate on Net Profits: **4.02%**.
📑 Common Pitfalls
- Confusing Gross Turnover with Net Profit: Class 4 National Insurance is calculated on net taxable profit (gross turnover minus allowable business expenses), not total revenue billed.
- Neglecting Voluntary Class 2 when Profits fall below £6,725: If your net profits fall below £6,725, failing to pay voluntary Class 2 NICs creates a missing qualifying year on your UK State Pension record.
- Assuming Employee Class 1 Rates Apply: Sole traders pay Class 4 NIC (6% main rate), which is lower than employee Class 1 NIC (8%), reflecting the lack of statutory employment benefits (sick pay/holiday pay).
❓ Frequently Asked Questions (FAQ)
The UK government abolished mandatory Class 2 National Insurance contributions for self-employed workers with profits above £6,725. You no longer pay weekly Class 2 fees, but still receive full Class 2 National Insurance credits toward your State Pension.
For the 2026/27 tax year, self-employed Class 4 National Insurance is charged at 6% on net profits between £12,570 and £50,270, and 2% on any net profits above £50,270.
Class 4 National Insurance is calculated automatically on your SA100 Self Assessment tax return and paid alongside your Income Tax bill by 31 January following the end of the tax year (with Payments on Account due 31 January and 31 July).
If your annual self-employed net profit is below £12,570, you pay £0 in Class 4 National Insurance. If profits are between £6,725 and £12,570, you receive automatic free Class 2 pension credits without paying any money.