How does the Corporation Tax Calculator work?

Small profits rate: 19% on profits up to £50,000 Then: Main rate: 25% on profits above £250,000 Then: Marginal relief applies between £50,000 and £250,000 — effective rate between 19% and 25% Then: Marginal relief formula: MR = (upper limit − profit) × (upper − lower) / upper × (main rate − small rate).

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

Example: Input £40,000 profit gives a result of CT = £7,600 (19%) (Small profits rate — straightforward).

Is the Corporation 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 Corporation Tax Calculator?

Our Corporation 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 Corporation 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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Corporation Tax Calculator

Corporation Tax Calculator (UK 2024)

Annual taxable profit (£)

After allowable deductions

UK Corporation Tax: 19% (profits <£50K) · Marginal relief (£50K–£250K) · 25% (profits >£250K)

Corporation Tax (CT) is charged on the taxable profits of limited companies trading in the UK. From April 2023, the UK introduced a new two-rate system: 19% for small profits and 25% for large profits, with marginal relief for profits between £50,000 and £250,000.

Symbol	Name	Unit	Description
MR	(upper limit − profit) × (upper − lower) / upper × (main rate − small rate)	—	(upper limit − profit) × (upper − lower) / upper × (main rate − small rate)

Profit Level	Rate Applied	Notes
Up to £50,000	19%	Small profits rate
£50,001 – £249,999	19–25% (marginal)	Marginal relief reduces effective rate
£250,000+	25%	Main rate — no relief
Associated companies	Divide limits	Limits divided by number of related companies

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Pro Tip

Capital allowances (Full Expensing since April 2023) allow 100% first-year deductions for qualifying plant and machinery — significantly reducing taxable profits in investment-heavy years.

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Corporation Tax Calculator

Corporation Tax Calculator (UK 2024)

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Corporation Tax Calculator (UK 2024)