Self-Employed NI UK 2026/27: Class 2 + Class 4 Rates Explained

UK self-employed National Insurance changed materially with the abolition of compulsory Class 2 NI from April 2024. From 2024/25 onwards, self-employed people whose profits exceed the Lower Profits Limit get their State Pension qualifying year automatically without paying Class 2 - but Class 2 remains available as a voluntary contribution for low-profit traders. Class 4 NI continues at 8% / 2% rates.

This guide gives the 2026/27 numbers, the worked examples, and the strategic decisions self-employed people face around NI.

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The 2026/27 framework

Three thresholds matter:

Threshold	2026/27 amount	Significance
Small Profits Threshold (SPT)	£6,725	Below this, no Class 4 NI; voluntary Class 2 available
Lower Profits Limit (LPL)	£12,570	At/above this, Class 4 NI starts; State Pension year auto-credited
Upper Profits Limit (UPL)	£50,270	Above this, Class 4 rate drops from 8% to 2%

Plus the Class 2 weekly rate when paid voluntarily: £3.45 per week in 2026/27 (£179.40 per year).

Class 4 NI - the main self-employed contribution

Class 4 NI in 2026/27:

8% on annual profits between £12,570 and £50,270
2% on annual profits above £50,270

Worked example - sole trader with £40,000 annual profit:

Total profit:                      £40,000.00
Less Lower Profits Limit:         -£12,570.00
Profit subject to Class 4 NI:      £27,430.00
× 8%:                               £2,194.40

Class 4 NI for the year:            £2,194.40

Worked example - sole trader with £80,000 annual profit:

Total profit:                      £80,000.00

Class 4 at 8% on £12,570 - £50,270:  £37,700 × 8% = £3,016.00
Class 4 at 2% on £50,270 - £80,000:  £29,730 × 2% =   £594.60

Total Class 4 NI:                                  £3,610.60

Class 4 is paid through your Self Assessment return, due 31 January following the end of the tax year. It's NOT paid through PAYE.

Class 2 NI - now voluntary, but strategically useful

The Spring Budget 2024 abolished compulsory Class 2 NI from 2024/25 onwards. The new framework:

Profits above £12,570 (LPL): you automatically get a State Pension qualifying year, no Class 2 needed. Class 4 still applies as above.
Profits between £6,725 and £12,570 (SPT-LPL): you automatically get a State Pension qualifying year through "deemed Class 2", no payment needed. No Class 4 either.
Profits below £6,725 (below SPT): NO automatic qualifying year. You can voluntarily pay Class 2 at £3.45/week (£179.40/year) to secure the qualifying year.

The decision for low-profit traders: is paying £179.40/year voluntarily worth the State Pension qualifying year?

For most people it absolutely is. Each qualifying year adds approximately £6.32/week (£328.64/year) to your eventual full new State Pension once it's in payment. Over a 20-year retirement that's around £6,500 - return on a £179 investment.

If you're already on track for 35 qualifying years (the maximum needed for the full new State Pension), additional years don't add anything - pay only if you're still building toward 35.

Combined self-employment + employment

If you have both employment and self-employment income, you pay both:

Class 1 through PAYE on your employment income (8% above PT, 2% above UEL).
Class 4 through Self Assessment on your self-employment profit.

There IS an annual maximum for combined Class 1 + Class 4 contributions. For 2026/27 the max is calculated as:

Maximum Class 1 + Class 4 = (UEL - PT) × 8% + £160 (capped extension)
                          = (£50,270 - £12,570) × 8%
                          = £3,016

If your combined Class 1 + Class 4 exceeds this, you can claim a refund of the excess from HMRC. This is uncommon but worth checking if you have substantial mixed income.

How and when to pay

Class 4

Calculated automatically as part of your Self Assessment return (filed by 31 January following the tax year end). Paid as part of your overall SA tax bill.

If your previous year's tax bill exceeded £1,000, you also pay Payments on Account - two interim payments (31 January and 31 July) towards the next year's bill, each typically 50% of the previous year's combined tax + Class 4.

Voluntary Class 2

Paid through Self Assessment if you're already filing one. Otherwise you can pay directly to HMRC by Direct Debit, BACS, or cheque. Use the pay Class 2 NI service on gov.uk.

The Class 2 voluntary tick-box on the SA return is easy to miss - it's in the "Self-Employment (Short)" or "Self-Employment (Full)" supplementary section. If you forget to tick it but later realise you should have paid voluntarily, you can pay direct to HMRC up to 6 years after the year of non-payment (subject to the relevant rate at the time).

Mixed PAYE + self-employed scenario

A common pattern: full-time PAYE job + side hustle. If your side hustle profit exceeds £1,000 (the Trading Allowance threshold), you must register for Self Assessment and report it.

Worked example - PAYE earner £35,000 + side-business profit £8,000:

PAYE income:               £35,000
Class 1 NI on PAYE:        £1,794.40 (already paid via payroll)

Side-business profit:       £8,000
- Already getting State Pension year credit via PAYE
- Profit below LPL £12,570 → no Class 4 NI
- Trading allowance offsets first £1,000

Self Assessment will report:
  £35,000 PAYE income
  £8,000 trading profit (less £1,000 trading allowance)
  £7,000 net trading profit
  Income tax on this: £7,000 × 20% = £1,400 (assumes basic-rate)

You owe £1,400 of income tax on the side business but no NI on it.

If your side-business profit grew to £15,000 (above LPL), you'd also owe Class 4 NI on the amount above £12,570 - even though Class 1 is already covering your State Pension year via PAYE.

State Pension year-credit interaction

You get one qualifying year per tax year, regardless of how many income sources contribute. You CANNOT double-credit by paying both Class 1 (employment) and Class 4 (self-employment) NI in the same year.

For someone juggling multiple income sources, this means:

If your PAYE earnings already cross the Lower Earnings Limit (£6,396), you have your year. Class 4 NI on top of PAYE doesn't add another qualifying year.
If both your PAYE and self-employment incomes are very low and combined still under £6,396, you may have a gap year - voluntary Class 2 (or Class 3 for non-self-employed gaps) is the fix.

See our State Pension top-ups guide for the full mechanics.

When to talk to an accountant

Self-employed NI calculation is straightforward at low complexity but gets complex when:

You have multiple income sources crossing thresholds in different years.
You're applying Trading Allowance or other reliefs.
You're a partner in a partnership (Class 4 calculated differently).
You have foreign income or dual residency.
You're unsure whether you're genuinely self-employed (HMRC's CEST tool helps; case law is broader).

For straightforward sole-trader Self Assessment, the HMRC online filing covers everything. For complex situations, an ICAEW/ACCA-registered accountant or CTA-qualified tax adviser is worth the fee.

Disclaimer

PayslipIQ provides automated educational guidance based on the figures you supply. It is not regulated tax advice. Self-employment NI rules interact with State Pension entitlement, Universal Credit, Working Tax Credit and ITSP in complex ways. For substantial decisions or unusual circumstances, contact HMRC on 0300 200 3300 or use a CTA-qualified tax adviser.