Pillar Guide · Updated June 2026
Class 4 National Insurance for Self-Employed UK 2026/27 -- Rates, When to Pay and State Pension
Self-employed people in the UK pay Class 4 National Insurance on their annual net trading profits via Self Assessment. For 2026/27 the rates are 6% on profits between GBP 12,570 and GBP 50,270 and 2% on profits above GBP 50,270. Class 2 NI -- the old flat weekly charge -- was abolished from 6 April 2024. State Pension qualifying years are now built through Class 4 alone once profits exceed GBP 12,570. Self-employed people with gaps in their NI record can fill them with voluntary Class 3 contributions at GBP 18.40/week. At the same income level, a self-employed person pays substantially less NI than an employee -- but loses access to some contributory benefits. This guide covers the Class 4 calculation in full, what counts as net profit, how the Self Assessment payment schedule works, how Class 4 protects your State Pension, voluntary Class 3 top-ups, and a direct comparison of self-employed versus employed NI at key income levels.
Class 4 NI Rates 2026/27 -- The Two-Band Structure
Class 4 National Insurance has a simple two-band structure based on annual net trading profits. The rates for 2026/27 are:
Class 4 NI rates 2026/27
| Profit band | Rate | Annual NI on band |
|---|---|---|
| Below GBP 12,570 (Lower Profits Limit) | 0% | Nil |
| GBP 12,570 to GBP 50,270 | 6% | Up to GBP 2,262 |
| Above GBP 50,270 (Upper Profits Limit) | 2% | Uncapped |
Source: HMRC 2026/27. Lower Profits Limit and Upper Profits Limit are aligned with the personal allowance (GBP 12,570) and higher-rate threshold (GBP 50,270).
The main rate of 6% is meaningfully lower than the employee Class 1 NI main rate of 8%. This gap reflects that self-employed people do not receive Statutory Sick Pay, are not entitled to contributory Employment and Support Allowance as employees, and bear their own employment costs (no employer NI on their behalf). The 2% additional rate above GBP 50,270 is the same for both employed and self-employed.
Abolition of Class 2 NI from April 2024 -- What Changed
Before April 2024, self-employed people paid two classes of NI: Class 2 (a flat GBP 3.45/week charge for 2023/24, collected via Self Assessment) and Class 4 on profits. Class 2 was the mechanism through which self-employed people earned State Pension qualifying years and access to contributory benefits.
From 6 April 2024, Class 2 NI was abolished entirely. The reform simplified the system but created a new mechanism for State Pension entitlement:
- Profits above GBP 12,570: paying Class 4 NI automatically grants a full qualifying year for the State Pension. No separate action needed.
- Profits between GBP 7,105 and GBP 12,570: a qualifying year is credited at no cost (a transitional protection carried forward from the old Small Profits Threshold rule). You pay no Class 4 NI but still accrue pension entitlement.
- Profits below GBP 7,105: no qualifying year is credited and no NI is due. If you want to protect your State Pension in a low-profit year, voluntary Class 3 contributions are the solution.
The abolition of Class 2 also removed the cheapest way to fill historic NI gaps. Anyone who previously relied on voluntary Class 2 (at around GBP 180/year) to top up their record must now use Class 3 at GBP 956.80/year for gaps from 2024/25 onwards. Gaps in earlier years that fell under Class 2 rules may still be fillable with Class 2 rates -- check with HMRC for your specific record.
What Counts as Net Profit -- The Class 4 NI Base
Class 4 NI is charged on your taxable trading profit -- the same figure reported on your Self Assessment return as self-employment income. To arrive at net profit, start with total turnover and deduct allowable business expenses.
Allowable expenses include:
- Cost of goods sold and raw materials
- Staff wages and subcontractor costs
- Business premises rent, rates and utilities
- Professional indemnity and business insurance
- Accountancy and legal fees (business-related)
- Professional subscriptions and memberships
- Business travel costs (not commuting to a permanent workplace)
- Vehicle running costs -- the business-use proportion, or the flat HMRC mileage rate (45p/mile for the first 10,000 miles, 25p/mile above)
- Marketing, advertising and website costs
- Office supplies, stationery and postage
- Business proportion of phone and broadband bills
- Bank charges on business accounts
Items that do NOT reduce net profit for Class 4 NI:
- Personal drawings (your own salary from the business is not an expense for a sole trader)
- Private living costs, even if you work from home (only the business proportion of home costs is deductible -- HMRC flat rate: GBP 10/month for up to 25 hours worked at home, GBP 18/month for 51-100 hours, GBP 26/month for over 100 hours)
- Capital purchases (these qualify for capital allowances, not a direct expense deduction -- though the Annual Investment Allowance of GBP 1,000,000 can write off qualifying plant and machinery 100% in year one)
- HMRC penalties and fines
- Client entertainment (not deductible)
- Personal pension contributions (deducted for income tax but NOT for Class 4 NI)
How Class 4 NI Is Collected via Self Assessment
Class 4 NI is not paid separately -- it is calculated by HMRC when you submit your Self Assessment tax return and collected as part of your combined income tax and NI bill. The annual cycle works as follows:
- Submit your Self Assessment return by 31 January (online) for the previous tax year (ending 5 April). HMRC calculates your income tax and Class 4 NI simultaneously.
- Balancing payment due 31 January -- the total bill for the previous year minus any payments on account already made.
- First payment on account for the current year also due 31 January -- equal to 50% of last year's total bill (income tax + Class 4 NI combined).
- Second payment on account due 31 July -- another 50% of last year's bill as a further advance payment.
Worked example -- Class 4 NI calculation
Net trading profit: GBP 55,000
Class 4 NI at 6%: (GBP 50,270 - GBP 12,570) = GBP 37,700 x 6% = GBP 2,262
Class 4 NI at 2%: (GBP 55,000 - GBP 50,270) = GBP 4,730 x 2% = GBP 95
Total Class 4 NI: GBP 2,357
Income tax on GBP 55,000 (after personal allowance GBP 12,570):
Basic rate: GBP 37,700 x 20% = GBP 7,540
Higher rate: (GBP 55,000 - GBP 50,270) x 40% = GBP 4,730 x 40% = GBP 1,892
Total income tax: GBP 9,432
Combined Self Assessment bill: GBP 9,432 + GBP 2,357 = GBP 11,789
Payments on account are based on the previous year's bill. If your profits fall significantly year-on-year, you can apply to reduce payments on account to avoid overpaying in advance. However, HMRC charges interest if the actual bill exceeds the reduced payments, so do not reduce them speculatively.
Class 4 NI and the State Pension -- How Qualifying Years Work
To receive the full new State Pension (GBP 241.30/week = GBP 12,547.60/year in 2026/27), you need 35 qualifying years of National Insurance contributions or credits. You need at least 10 qualifying years to receive any State Pension.
Since the abolition of Class 2 NI in April 2024, self-employed people earn qualifying years through Class 4 NI. Each tax year in which your profits exceed GBP 12,570 counts as one qualifying year. If your profits fall between GBP 7,105 and GBP 12,570, you still receive a qualifying year at no cost (the credit is automatic -- you do not need to do anything).
Checking your NI record: HMRC provides a free online service (via the government gateway or HMRC app) where you can see: how many qualifying years you have built up to date, which years have gaps, your projected State Pension based on current record, and whether buying additional years would increase your pension.
State Pension age is currently 66 for both men and women. Class 4 NI ceases in the tax year you reach State Pension age -- from 6 April of that year. If you reach State Pension age on, say, 1 December 2026, you pay no Class 4 NI from 6 April 2026 onwards (the start of that tax year).
Voluntary Class 3 NI -- Filling Gaps to Protect Your Pension
If you have gaps in your NI record -- years where you did not earn a qualifying year -- you can make voluntary Class 3 National Insurance contributions to fill them. The rate for 2026/27 is GBP 18.40/week, or GBP 956.80 for a full year.
Is it worth it? Each additional qualifying year adds 1/35 of the full State Pension to your weekly entitlement. In 2026/27 that is GBP 241.30 / 35 = GBP 6.89/week = GBP 358/year. At a cost of GBP 956.80, the payback period is roughly 2.67 years of drawing the pension. Since the average person draws the State Pension for 20+ years, voluntary contributions are almost always excellent value if you have fewer than 35 qualifying years.
Important considerations:
- You can normally fill gaps going back only 6 tax years. Check HMRC's deadline -- certain extended windows have passed (the 2006-2017 gap window closed 5 April 2025).
- Before paying, verify the gap year is genuinely unfilled and that filling it actually increases your pension. Some people already have 35+ qualifying years and additional contributions make no difference.
- Credits may already cover some gaps for free: years caring for a child under 12 (Child Benefit gives NI credits), years receiving certain benefits, or years registered as a carer. Check your record first.
- Class 3 contributions for gaps in 2024/25 onwards are charged at the current Class 3 rate. Gaps in years before 2024/25 may be fillable at the historical Class 2 or Class 3 rate -- contact HMRC for a quote.
Self-Employed NI vs Employee NI -- A Direct Comparison
The table below compares the total NI burden for a self-employed person versus an employee at the same gross income level in 2026/27. Note that the employer NI shown is not a direct cost to the employee but is part of the total employment cost borne by the employer.
NI comparison: self-employed vs employee (2026/27)
| Income / Profit | Employee Class 1 NI | Self-Employed Class 4 NI | Saving (self-employed) |
|---|---|---|---|
| GBP 20,000 | GBP 596 | GBP 447 | GBP 149 |
| GBP 30,000 | GBP 1,395 | GBP 1,047 | GBP 348 |
| GBP 40,000 | GBP 2,194 | GBP 1,646 | GBP 548 |
| GBP 50,270 | GBP 3,016 | GBP 2,262 | GBP 754 |
| GBP 60,000 | GBP 3,210 | GBP 2,457 | GBP 753 |
| GBP 80,000 | GBP 3,611 | GBP 2,857 | GBP 754 |
Employee NI: 8% on GBP 12,570--GBP 50,270, 2% above. Self-employed Class 4 NI: 6% on GBP 12,570--GBP 50,270, 2% above. Employer NI (15% above GBP 5,000) not shown -- this is an additional employer cost not borne by the employee.
Self-employed people at GBP 40,000 profit save roughly GBP 548/year in personal NI compared to an employee at the same earnings. However, the employee's employer also pays around GBP 5,250 in employer NI on GBP 40,000 of salary -- making the total NI cost of employing someone at GBP 40,000 approximately GBP 7,444 (employee + employer combined), versus just GBP 1,646 for a self-employed person at the same profit level. This difference partly explains why HMRC monitors IR35 (off-payroll working rules) so carefully.
MTD ITSA -- What Self-Employed People Must Know for 2026
Making Tax Digital for Income Tax Self Assessment (MTD ITSA) is changing how self-employed people and landlords report income to HMRC:
- From April 2026: mandatory for self-employed people and landlords with total income over GBP 50,000. You must use MTD-compatible software to keep digital records and submit quarterly updates to HMRC, with a final declaration replacing the annual Self Assessment return.
- From April 2027: extends to those with income over GBP 30,000.
- From April 2028: further extended to those with income over GBP 20,000.
MTD ITSA does not change how Class 4 NI is calculated -- the rates and thresholds remain the same. But it does change how frequently you report to HMRC and the software you need. If you earn over GBP 50,000 from self-employment (or a combination of self-employment and rental income), you should already be using MTD-compatible accounting software. HMRC will not send reminders -- compliance is your responsibility.
Practical Tips to Manage Your Class 4 NI Bill
A few straightforward steps can help you stay on top of Class 4 NI:
- Set aside NI and tax as you earn. A common rule of thumb for basic-rate taxpayers is to reserve 25-30% of net profit for combined income tax and Class 4 NI. Higher-rate taxpayers should reserve 40-45%.
- Claim all allowable expenses. Every GBP 100 of unclaimed expense costs you GBP 6 in unnecessary Class 4 NI (at the 6% rate) plus income tax on top. Good bookkeeping pays for itself.
- Use the Annual Investment Allowance. Major equipment purchases can be written off 100% against profit in the year of purchase (up to GBP 1,000,000), reducing both income tax and Class 4 NI immediately rather than via depreciation over several years.
- Check your NI record annually. Do this via HMRC online to catch any unexpected gaps before they become expensive to fill.
- Consider incorporation if profits are high. A limited company pays Corporation Tax (19% on profits up to GBP 50,000; 25% above GBP 250,000) and dividends are taxed at 8.75% (basic), 33.75% (higher) or 39.35% (additional) with a GBP 500 dividend allowance. Company directors pay no Class 4 NI -- they pay employer and employee NI only on salary. At profits above roughly GBP 50,000, incorporation often produces a lower combined tax and NI bill, though accounting costs and administrative burden increase.
- Reduce payments on account carefully. If your profits fall, apply via Self Assessment to reduce payments on account and improve cash flow -- but keep the reduction conservative to avoid an HMRC interest charge in January.