What's My REAL Tax Rate?

The complete UK self-employed tax stack: income tax + NI + student loans + HICBC

Your real effective tax rate as a UK self-employed person is the sum of income tax, Class 4 National Insurance, and any student loan repayments and High Income Child Benefit Charge — all computed on the same profit figure. At £20,000 profit your effective rate is about 9.7%. At £60,000 it jumps to 23.1%. Between £100,000 and £125,140 the personal allowance taper creates a 62% effective marginal rate before student loans. Add Plan 2 plus postgraduate loans and the marginal rate in that band can reach 77%.

Last reviewed: 26 May 2026

Guidance, not advice. We explain the rules, we don't assess your situation. Always seek financial or tax advice from your accountant, or contact HMRC. Read our editorial scope →

Core 2025/26 rules

The 2025/26 tax framework for self-employed people in England and Northern Ireland. Wales uses the same income tax bands; Scotland has its own system covered in the Scottish twist section below.

Income tax

Personal allowance: £12,570. Basic rate 20% on £12,571–£50,270. Higher rate 40% on £50,271–£125,140. Additional rate 45% above £125,140. Personal allowance tapers by £1 for every £2 above £100,000, disappearing entirely at £125,140.

Class 4 National Insurance

Main rate 6% on profits between £12,570 and £50,270. Upper rate 2% on profits above £50,270. Class 2 is now voluntary (£3.45/week) but paying it protects your state pension record.

Student loan thresholds

Plan 1: £24,990. Plan 2: £27,295. Plan 4 (Scotland): £31,395. Plan 5 (post-2012 English): £25,000. Postgraduate loan: £21,000. All are 9% (Plan 1–5) or 6% (PG) of income above threshold.

HICBC

1% of child benefit per £200 of income above £60,000. At £80,000 the charge equals 100% of child benefit received. The charge is on the higher earner, regardless of who claims the benefit.

Dividend rates

£500 dividend allowance. 8.75% basic, 33.75% higher, 39.35% additional. For Ltd directors, salary + dividend extraction is covered in the Sole trader vs Ltd outline section.

Corporation tax overview

19% small profits rate below £50,000. 25% main rate above £250,000. Marginal relief between £50,000 and £250,000. Relevant for the Ltd comparison only.

Marginal stacks by profit level

These figures are for a sole trader in England with no student loans, no HICBC, and no pension contributions. They show the total tax + NIC burden and the effective rate on the entire profit, plus the marginal rate on the next £1,000 of profit.

Tax stack by profit level — sole trader, England, 2025/26

Profit	Income Tax	Class 4 NI	Total	Effective Rate	Marginal Rate
£20,000	£1,486	£446	£1,932	~9.7%	~26%
£40,000	£5,486	£1,646	£7,132	~17.8%	~26%
£60,000	£9,432	£2,187	£11,619	~19.4%	~42%
£100,000	£27,432	£3,147	£30,579	~30.6%	~42%
£150,000	£52,440	£4,147	£56,587	~37.7%	~47%

The £100k trap

The personal allowance taper is the most brutal marginal rate in the UK tax system. It is not a separate tax — it is the mechanical withdrawal of the £12,570 allowance as your income rises.

How the taper works

For every £2 of adjusted net income above £100,000, you lose £1 of personal allowance. So £110,000 income loses £5,000 of PA. £125,140 loses all £12,570. The £25,140 band between £100k and £125k therefore has an extra 20% tax load (the lost allowance, taxed at 40%) on top of the 40% higher rate + 2% NI = 62%.

Escape routes

Pension contributions are the most efficient escape. A £20,000 gross contribution at £120,000 restores £10,000 of personal allowance, saving £4,000 (40% on contribution) + £4,000 (restored allowance, 40% on £10,000) = £8,000 on a £20,000 contribution — a 60% effective relief rate. Gift Aid works similarly but is capped by your actual donations. Trading losses brought forward also reduce adjusted net income.

Scottish twist

Scotland has its own income tax bands set by the Scottish Parliament. National Insurance remains UK-wide, so the total stack differs.

Scottish bands 2025/26

Starter 19%: £12,571–£15,397. Basic 20%: £15,398–£28,068. Intermediate 21%: £28,069–£43,662. Higher 42%: £43,663–£125,140. Advanced 45%: £125,141–£100,000 (wait, no — corrected: Advanced is £75,001–£125,140 at 45%). Top 48% above £125,140.

The £100k trap in Scotland

The personal allowance taper is UK-wide, so it still applies. But because the higher rate is 42% not 40%, the marginal rate in the taper band is 42% + 2% NI + 20% (lost allowance at 42%) = 65%. The £100k trap is worse in Scotland.

England vs Scotland — effective tax + NIC rate at key profit levels, 2025/26

Profit	England (rUK)	Scotland	Approx £ difference
£20,000	~9.7%	~9.7%	~£0
£40,000	~17.8%	~18.1%	~£120 more in Scotland
£60,000	~19.4%	~20.8%	~£840 more in Scotland
£100,000	~30.6%	~32.1%	~£1,500 more in Scotland
£150,000	~37.7%	~39.4%	~£2,550 more in Scotland

Student loan stacking

Student loans are the most commonly forgotten layer. They are not 'debt' in the conventional sense — they are a graduate tax by another name, collected via PAYE or Self Assessment.

Plan 2 at £60k

At £60,000 profit, Plan 2 repayment is 9% of (£60,000 − £27,295) = £2,943. That adds ~4.7% to the effective rate, taking the £60k stack from ~19.4% to ~24.1%.

Plan 2 + postgraduate combined

At £60,000 with both Plan 2 (9%) and postgraduate (6%), the marginal rate is 42% + 2% + 9% + 6% = 59%. In the £100k trap it reaches 42% + 2% + 9% + 6% + 20% (PA taper) = 77% — though in practice very few people have both loans plus income in that band.

HICBC band £60k–£80k

The High Income Child Benefit Charge is the most politically contested layer because it applies to household income on an individual basis. A single parent earning £60,001 with 2 children pays a charge that would not apply if two parents each earned £30,000.

The tax maths

For 2 children, child benefit is approximately £2,337 per year (2025/26 rates). At £60,000 the charge is 0%. At £80,000 it is 100% (£2,337). The marginal rate in this band is £2,337 / £20,000 = ~11.7% on top of 42% income tax + 2% NI = 53.7% before student loans even enter the picture.

Layering all three

A graduate parent with 2 children, Plan 2, earning £70,000: 42% IT + 2% NI + 9% Plan 2 + 11.7% HICBC = 64.7% marginal. This is before the £100k trap. Many families in the £60k–£80k band are paying a higher marginal rate than they realise.

Sole trader vs Ltd outline

The comparison at three profit levels, assuming the director takes a salary at the primary threshold (£12,570) and dividends for the rest, with no pension contributions.

Why Ltd wins above £100k

The Ltd structure lets you keep profits inside the company (19–25% CT) and extract as dividends at a lower rate than 40% income tax. At £100k, a sole trader pays 40% on everything above £50,270. A Ltd director pays 19% CT + 8.75% dividend tax on the remainder after salary. The crossover is roughly £40k–£50k of sustained profit, but only if you can leave profits in the company.

Smoothing and pension

Ltd structures also allow pension contributions as an employer expense (CT-deductible, no personal tax). A £60,000 employer contribution saves £11,400 in CT and reduces the director's personal income. This is impossible for a sole trader, where pension contributions only attract basic-rate relief at source.

Sole trader vs Ltd director — effective combined tax rate, 2025/26

Profit	Sole trader (eff. rate)	Ltd (salary + div, eff. rate)	Winner
£60,000	~19.4%	~21.5%	Sole trader
£100,000	~30.6%	~28.1%	Ltd
£150,000	~37.7%	~33.4%	Ltd

Deduction stack at £60k

These are the most commonly under-claimed reliefs and their combined effect on the effective rate. Numbers are approximate for a sole trader at £60,000 profit.

Personal allowance

The £12,570 personal allowance is automatic but easily lost in the £100k taper. Value: £12,570 × 20% or 40% = £2,514 or £5,028. At £60k it saves £2,514.

£5,000 of extra expenses

Many sole traders under-claim: mileage at 45p/25p, use-of-home, phone/broadband apportionment, professional subscriptions. £5,000 of properly documented expenses saves £5,000 × 20% (if in basic rate) or 40% (if in higher rate) = £1,000–£2,000.

£5,000 pension contribution

For a sole trader, pension contributions attract basic-rate tax relief at source (20%) and higher-rate relief via Self Assessment (another 20%). At £60k profit (straddling both bands), £5,000 gross contribution costs £4,000 after basic relief, with £1,000 reclaimed via tax return. Net cost: £3,000 for £5,000 in the pension. Effective tax saving: up to £2,000.

Marriage Allowance

If your partner earns below £12,570 and you are a basic-rate taxpayer, you can transfer £1,260 of their unused allowance. Saves £252/year.

Simplified home-use

£18/month if you work 25+ hours from home = £216/year. At 20% = £43 saved.

Statute references: ITA 2007; ITTOIA 2005; National Insurance Contributions Act 2014; ITEPA 2003 s.681B.

Frequently asked questions

What happens if I miss the Self Assessment deadline?+

The Self Assessment deadline is 31 January (online filing) for the previous tax year. Miss it and HMRC apply an automatic £100 penalty. Beyond that: £10 per day from 3 months late (capped at £900), 5% of tax due at 6 months late, and another 5% at 12 months late, under Schedule 55 of the Taxes Management Act 1970. If you have a genuine reason (serious illness, bereavement, technical issue with HMRC's systems) you can appeal with evidence; HMRC accepts reasonable excuse appeals in most genuine cases.

Do I need an accountant or can I file Self Assessment myself?+

Legally you can file Self Assessment yourself via gov.uk for free, most simple sole-trader returns (single income source, basic expenses) are realistic to self-file. An accountant adds real value when: your trading profit is above £40,000 (extraction-strategy decisions matter), you have multiple income streams (PAYE + self-employment + property + dividends), you've crossed the £90,000 VAT threshold, you're considering incorporation, or you have an HMRC enquiry. Expect to pay £400-£1,500/year for a typical sole-trader accountant; the cost is itself a deductible expense.

How do payments on account work?+

When your Self Assessment tax bill exceeds £1,000 for the first time, HMRC requires payments on account toward NEXT year's tax. Half the current bill is due 31 January (alongside the current bill); the other half is due 31 July. So your first January after crossing the threshold can hit with a double-bill: last year's balance + first payment on account. Adjust via Form SA303 if you expect next year's income to drop substantially. Payments on account don't apply if more than 80% of your tax is collected via PAYE.

Why is the marginal rate 62% between £100k and £125,140?+

The personal allowance of £12,570 tapers by £1 for every £2 of adjusted net income above £100,000. At £100,001 you have £12,569.50 of PA; at £125,140 you have zero. That means an extra £1 of income in that band costs you 40p income tax plus 20p lost personal allowance (taxed at 40%) = 60p, plus 2p Class 4 NI = 62p. This is a marginal rate, not an average rate — it only applies to income inside that specific band.

How do student loans stack on top?+

Student loan repayments are calculated on the same income figure as income tax but use their own thresholds. Plan 2 repayments are 9% of income above £27,295 (2025/26). Plan 1 is 9% above £24,990. Postgraduate loans are 6% above £21,000. These stack on top of income tax and NI: at £60,000 profit with Plan 2, your marginal rate is 42% income tax + 2% Class 4 NI + 9% Plan 2 = 53%. In the £100k–£125k trap with Plan 2 + PG loan, the theoretical combined marginal rate reaches 77%.

Does HICBC count as tax?+

The High Income Child Benefit Charge (ITEPA 2003 s.681B) is not technically tax — it is a charge on the higher earner in a household receiving child benefit. But it behaves exactly like a tax: it is calculated as a percentage of income, collected via Self Assessment, and has no connection to the actual child benefit received. For 2 children, the charge is approximately £2,337 per year at £80,000 income, creating an effective 11.7% marginal rate in the £60k–£80k band. Most tax planners treat it as a income-tax layer.

How do I escape the £100k trap?+

The most common escape routes are: (1) pension contributions — gross contributions reduce adjusted net income, restoring personal allowance at £1 saved per £2 contributed; (2) Gift Aid donations — grossed-up at 20%, also reducing adjusted net income; (3) trading losses brought forward; (4) salary sacrifice arrangements for pension or childcare. A £10,000 gross pension contribution at £110,000 income restores £5,000 of personal allowance and saves £4,000 in tax at 40% plus £2,000 from the restored allowance = £6,000 total relief on a £10,000 contribution.