Corporation Tax Calculator

How to Use

Enter your company's taxable profit (revenue minus allowable business expenses and deductions) and your applicable corporation tax rate. Since rates and rules vary widely by country, and many jurisdictions use tiered rates or special small-business rates, enter the single effective rate that applies to your situation for the closest estimate. The Net Profit After Tax figure shows exactly what's left for the company to retain or distribute once the estimated tax is subtracted, useful as a quick input into further planning, like deciding how much can realistically be paid out as dividends.

What Counts as Taxable Profit

Taxable profit is not the same figure as revenue, cash in the bank, or even accounting profit shown on a company's financial statements, it's a specifically defined figure calculated by starting from revenue, subtracting allowable business expenses (salaries, rent, cost of goods sold, and similar operating costs), applying any capital allowances for equipment and assets, and offsetting any losses carried forward from prior years. Corporation tax is calculated only on what remains after all of that, which is why two companies with identical revenue can owe very different amounts of corporation tax depending on their expense structure, asset investments, and loss history.

Worked Example: A Flat-Rate Calculation

With this tool's defaults, taxable profit of 2,000,000 and a 25% corporation tax rate, the tax owed is a single multiplication: 2,000,000 × 25% = 500,000. Net profit after tax comes to 2,000,000 − 500,000 = 1,500,000, the amount available to the company to retain as reserves, reinvest in the business, or distribute to shareholders as dividends. This is the simplest possible version of the calculation, a single flat rate applied to a single profit figure, real corporate tax systems are often more layered than this, but the underlying math for any single tax bracket always reduces to exactly this same multiplication.

Why a Single Flat Rate Is a Simplification

Many real-world corporate tax systems use tiered rates rather than one flat percentage applied to all profit, a lower rate on profit up to a certain threshold and a higher rate above it, similar in structure to how personal income tax brackets work. Some systems also apply entirely separate, lower rates specifically for qualifying small businesses regardless of profit level. This calculator intentionally keeps things simple by asking for one effective rate rather than modeling every bracket and threshold, if your jurisdiction uses a tiered system, calculate your blended effective rate first (total tax owed at actual bracket rates, divided by total taxable profit) and enter that single percentage here for an accurate result.

How Corporation Tax Fits Into the Bigger Picture

For an incorporated business, corporation tax is typically just the first of two tax layers that can apply to the same underlying profit. The company itself pays corporation tax on its taxable profit, and separately, whenever an owner or shareholder takes money out of the company as a salary or dividend, that individual then owes their own personal income tax on what they received. This two-layer structure is a deliberate feature of how corporations are treated as separate legal entities from their owners, and it's exactly why business structure (sole proprietorship vs. incorporated company) can meaningfully change someone's total effective tax burden even for the identical underlying business profit.

Using This Alongside Other Business Calculations

This calculator sits naturally alongside other profitability tools once a company is estimating its year-end position, taxable profit itself is typically the end result of a broader chain of calculations, revenue minus cost of goods sold gives gross profit, minus operating expenses gives pre-tax operating profit, adjusted for allowances and prior losses gives taxable profit, which is the starting figure this tool actually works from. Getting a reasonably accurate taxable profit figure before running it through this calculator matters more for the accuracy of the final result than the corporation tax calculation itself, which is deliberately simple once that input is known.

Frequently Asked Questions

Is taxable profit the same as revenue?

No, taxable profit is what remains after subtracting allowable business expenses, deductions, and any prior-year losses from total revenue, not revenue itself. Corporation tax applies to that final profit figure, not the top-line revenue number.

Does this account for tax credits or multiple tax brackets?

No, this applies a single flat rate you provide to the full taxable profit. Many jurisdictions use tiered rates, special rates for small businesses, or various credits and reliefs, check your local corporate tax rules for a more precise figure.

What's the difference between corporation tax and income tax?

Corporation tax applies to a company's own taxable profit as a separate legal entity. Income tax applies to individuals, including business owners on any salary or dividends they personally receive from the company. For an incorporated business, both taxes typically apply in sequence, the company pays corporation tax on its profit, and then owners pay their own income tax on whatever portion of that after-tax profit they take out as personal income.

Why do some countries have a lower corporation tax rate for small companies?

Many tax systems apply a reduced rate below a certain profit threshold specifically to support small and growing businesses, which often have thinner margins and less capacity to absorb a full standard rate compared to large, established corporations. Above that threshold, the standard (higher) rate typically applies to the excess profit or to the company's profit as a whole, depending on how the specific system is structured.

Can a company reduce its corporation tax bill legally?

Yes, through legitimate deductions and reliefs built into most tax systems, claiming allowable business expenses, capital allowances on equipment and assets, research and development credits, and carrying forward losses from a prior loss-making year to offset a current year's profit are all common, legal ways taxable profit (and therefore tax owed) can be reduced. This calculator works from a taxable profit figure you've already arrived at, it doesn't calculate those deductions itself.

Is corporation tax charged even if a company reinvests all its profit back into the business?

In most systems, yes, corporation tax is generally charged on taxable profit regardless of whether that profit is distributed to shareholders or retained and reinvested in the business. A small number of specific tax regimes do offer preferential treatment for reinvested profit, but this isn't the default assumption in most standard corporate tax systems, and this calculator doesn't model any such exception.