How does the Self Employed Tax Calculator work?

Income Tax is the same as for employees: 20% basic, 40% higher, 45% additional rate Then: Class 4 NI: 9% on profits between £12,570–£50,270, then 2% above £50,270 Then: Class 2 NI: £3.45 per week (£179.40/year) if profits exceed £12,570 — contributes to state pension Then: First Self Assessment deadline: 31 January following the tax year end.

Can you give an example of how to use the Self Employed Tax Calculator?

Example: Input £30,000 profit gives a result of Income tax: £3,486 · Class 4 NI: £1,564 · Class 2: £179 = £5,229 total (Take-home: ~£24,771).

Is the Self Employed Tax Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Self Employed Tax Calculator?

Our Self Employed Tax Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

Is this Self Employed Tax Calculator accurate for my country?

This calculator uses general tax principles as a guide. Tax laws vary by country and are updated frequently — always verify with your national tax authority or a qualified tax professional.

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Self Employed Tax Calculator

Self-Employed Tax Calculator (UK 2024/25)

Annual profit / net income (£)

Income after allowable expenses

Self-employed individuals in the UK pay Income Tax and two types of National Insurance (Class 2 and Class 4) on their trading profits. Unlike employees, there is no PAYE — tax is paid via Self Assessment, typically in two payments on account (31 January and 31 July) plus a balancing payment.

Tax / NI	Rate	On what income
Income Tax	20%	Profit £12,571 – £50,270
Income Tax	40%	Profit £50,271 – £125,140
Income Tax	45%	Profit above £125,140
Class 4 NI	9%	Profit £12,570 – £50,270
Class 4 NI	2%	Profit above £50,270
Class 2 NI	£3.45/week	If profit > £12,570

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Pro Tip

Set aside 25–30% of every invoice payment for tax. Open a separate savings account and transfer this proportion immediately — it prevents the tax bill shock in January.

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Self Employed Tax Calculator

Self-Employed Tax Calculator (UK 2024/25)

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