National Insurance for the Self-Employed UK 2026/27: Class 2, Class 4 & Qualifying Years

Quick answer

If you're self-employed in 2026/27, your National Insurance is mainly Class 4, charged at 6% on profits between £12,570 and £50,270 and 2% on profits above £50,270 — paid through Self Assessment alongside your income tax. The old flat-rate Class 2 contribution is no longer compulsory: if your profits exceed £6,725 you still build a State Pension qualifying year for free, and if they're below that you can pay Class 2 voluntarily to keep your record going. Getting the qualifying-years picture right matters enormously, because it determines how much State Pension you'll eventually receive.

The two classes of self-employed NI

Self-employed National Insurance comes in two parts:

• Class 4 — the main earnings-related contribution, a percentage of your profits.
• Class 2 — historically a small flat weekly charge that built your benefit entitlement; now largely abolished as a compulsory charge but still relevant for low earners and as a voluntary top-up.

Employees, by contrast, pay Class 1 at 8% and 2% and their employer pays 15% — so the self-employed pay a noticeably lower headline rate than employees, partly reflecting fewer benefit entitlements. Work out your liability with the

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Class 4: the main charge

Class 4 is calculated on your taxable trading profits for the tax year. For 2026/27:

• Nothing on profits up to the £12,570 lower profits limit.
• 6% on profits between £12,570 and £50,270.
• 2% on profits above £50,270.

So a sole trader with £40,000 of profit pays Class 4 on £40,000 − £12,570 = £27,430 at 6% = £1,645.80. Someone with £80,000 of profit pays 6% on the £37,700 band (£2,262) plus 2% on the £29,730 above £50,270 (£594.60) = £2,856.60.

Class 4 is collected through your Self Assessment return at the same time as income tax, and it's included in your payments on account. There's no separate bill — it's all part of the 31 January and 31 July payments.

The combined marginal rate

Because income tax and Class 4 land on the same profits, your true marginal cost is higher than the income-tax rate alone:

• Profits £12,570–£50,270: 20% income tax + 6% Class 4 = 26%.
• Profits £50,270–£100,000: 40% income tax + 2% Class 4 = 42%.
• Profits £100,000–£125,140: the 60% personal-allowance taper + 2% Class 4 = 62%.

This combined view is why pension contributions are so attractive for the self-employed — they reduce both taxes. Model the full picture with the

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Class 2: abolished as a charge, but not as a concept

For years the self-employed paid a small flat-rate Class 2 contribution (a few pounds a week) that built their entitlement to the State Pension and certain benefits. That compulsory charge has been removed. What replaced it:

• If your profits are above the £6,725 small profits threshold, you are treated as having paid Class 2 without actually paying anything — you build a qualifying year for free.
• If your profits are below £6,725 (or you make a loss), you can choose to pay Class 2 voluntarily — at a modest weekly rate — to keep building qualifying years and protect your record.

This is a genuinely good deal for low-profit years: voluntary Class 2 is far cheaper than voluntary Class 3 (which employees and others use), so a self-employed person having a quiet year should usually pay it rather than risk a gap.

Why qualifying years matter so much

Your State Pension depends on your number of qualifying years of National Insurance:

• 35 qualifying years are needed for the full new State Pension of £241.30 a week (~£12,548/year) in 2026/27.
• 10 qualifying years is the minimum to receive anything.
• Each year between 10 and 35 adds roughly 1/35th of the full amount.

A qualifying year is one where you paid or were credited with enough NI. For the self-employed, that means either profits above £6,725 (free credit) or voluntary Class 2. Miss several years and you permanently reduce your pension — which, over a 20-year retirement, can cost tens of thousands of pounds. Check your record and forecast with the

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Filling gaps in your record

If you discover gaps — common for people who were self-employed with low profits, lived abroad, or had career breaks — you can often fill them with voluntary contributions. The self-employed use voluntary Class 2 for years they were trading, which is cheap; for other gaps, Class 3 voluntary contributions apply at a higher rate. There's a deadline: normally you can only go back six years, though extended windows have applied for older gaps. Each filled year that lifts you toward 35 can add roughly £358 a year to your State Pension for life — often paying for itself within three to four years of retirement. Our guide on voluntary NI top-ups works through the maths.

Worked example: a low-profit year

Maya is a freelance designer. After a slow year, her profits are just £5,000 — below the £6,725 threshold, so she gets no free qualifying year.

• If she does nothing, 2026/27 won't count toward her 35 years.
• For a modest voluntary Class 2 payment (a few pounds a week, around £180 for the year), she secures the qualifying year.

Given that one qualifying year is worth roughly £358 a year of State Pension for life, paying ~£180 now to bank the year is an exceptional return — and far cheaper than buying the same year later via Class 3. Low-profit years are precisely when voluntary Class 2 earns its keep.

When you might also have Class 1

If you combine self-employment with employment, you'll pay Class 1 NI through PAYE on the job and Class 4 on your self-employed profits. There's an annual maximum to stop you overpaying across multiple sources; HMRC reconciles this, and if you've paid too much across employments and self-employment you can claim it back. People with a salaried job and a side business should check they haven't overpaid, especially if both incomes are substantial.

Registering and paying

You must register as self-employed with HMRC by 5 October following the end of the tax year in which you started trading. From then, your Class 4 (and any voluntary Class 2) flows through your annual Self Assessment return, due online by 31 January, with payments on account in January and July. Keep records of profits for at least five years after the filing deadline. If your turnover is small, remember the £1,000 trading allowance may mean you don't need to register at all — but registering is what lets you bank qualifying years via voluntary Class 2.

NI versus the limited-company route

A perennial question for the self-employed is whether to incorporate, partly because company directors can largely sidestep National Insurance. A director who takes a small salary (around the NI thresholds) plus dividends pays no Class 4 NI at all — dividends aren't subject to NI. Against that, the company pays corporation tax at 19% or 25% on its profits first, and the director then pays dividend tax at 10.75%/35.75%/39.35% above the £500 dividend allowance on what's extracted. So incorporation can save NI but adds corporation tax and dividend tax, plus accountancy costs and admin. Whether it wins depends heavily on profit level and how much you need to draw versus retain. Crucially, a director taking only dividends and a sub-threshold salary may not build qualifying years unless the salary is set carefully above the lower earnings limit — so the NI "saving" can quietly cost State Pension entitlement. Compare the two routes with the

and the .

What your NI actually buys you

It helps to remember that NI isn't just a tax — it's the entry ticket to contributory benefits. For the self-employed, paying (or being credited with) Class 4 and the Class 2 equivalent builds entitlement to:

• The State Pension (the big one — 35 qualifying years for the full amount).
• Maternity Allowance for self-employed mothers who don't qualify for statutory maternity pay.
• New-style Employment and Support Allowance and bereavement support, in certain cases.

Notably, the self-employed do not get Statutory Sick Pay, and historically didn't build entitlement to the contribution-based jobseeker's allowance — part of the reason their NI rates are lower than employees'. Understanding what your contributions buy makes the case for protecting your qualifying years (and arranging your own income protection or sick-pay cover) much clearer. Check what statutory support you'd be entitled to with the

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Planning around the bands

Because Class 4 sits on top of income tax, the self-employed have the same incentives as employees to manage where their profits fall — but with NI in the mix the maths is sharper:

• A pension contribution reduces taxable profit, saving income tax (and, by lowering adjusted net income, helping with the HICBC and the £100k taper) — though, unlike employees with salary sacrifice, the self-employed don't save NI on the contribution itself.
• Timing income and expenses across the 5 April year-end (within the rules) can keep profits below a threshold in a borderline year.
• A bumper year that pushes profits over £50,270 only attracts 2% Class 4 on the excess, so the NI cost of a good year is modest — the income tax is the bigger consideration.

The combined 26% (basic) and 42% (higher) marginal rates we saw earlier are the figures to plan against. Model different profit levels with the

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Common self-employed NI mistakes

A handful of errors recur every January:

• Assuming Class 2 still has to be paid separately — for most it's now automatic above £6,725, and double-paying or being confused about it is common.
• Not paying voluntary Class 2 in a low-profit year, then discovering years later that the year didn't count toward the State Pension when it could have for a trivial sum.
• Forgetting Class 4 is in the payments on account — the 31 January and 31 July payments include NI, so budgeting only for income tax leaves a shortfall.
• Overpaying when also employed — failing to claim back NI when Class 1 from a job plus Class 4 from self-employment exceed the annual maximum.
• Ignoring the State Pension forecast until close to retirement, when gaps are harder or impossible to fill within the time limits.

Each is easily avoided by checking your

annually and reviewing your NI position when you file, not years later.

A simple annual checklist

To keep your NI position healthy, run through this each tax year:

1. Confirm your profit and whether it cleared the £6,725 threshold (free qualifying year) or needs voluntary Class 2.
2. Estimate your Class 4 — 6% on profits £12,570–£50,270, 2% above — and fold it into your payments-on-account planning.
3. Check your NI record on gov.uk for any gaps in earlier years and assess whether filling them is worthwhile.
4. If you also have a job, verify you haven't overpaid across Class 1 and Class 4.
5. Project your State Pension and act early if you're short of 35 qualifying years.

Treating NI as an annual housekeeping task rather than a once-near-retirement panic is what protects the pension you'll rely on for decades. Run the figures with the

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Putting it all together

National Insurance for the self-employed is simpler than it used to be but easy to get wrong on the part that matters most — your qualifying years. Pay Class 4 at 6%/2% through Self Assessment without fuss, but pay close attention to whether each year counts toward your State Pension: profits over £6,725 earn a free year, while low-profit years are exactly when voluntary Class 2 is worth paying. Combined with income tax, your self-employed profits face a marginal rate of 26% or more, which is why pension contributions are doubly valuable. Check your liability with the

and your record with the .

This article is general information, not tax advice. Figures use 2026/27 UK rates. Consider an accountant for complex affairs or large gap-filling decisions.