What Is the Corporate Income Tax Calculator?
This calculator estimates how much corporate income tax a business owes based on its taxable income and the applicable flat corporate tax rate. It works with any jurisdiction's rate — simply enter the percentage that applies to your company (for example, the US federal corporate rate of 21%, or your country's statutory rate). It also shows your after-tax income and effective tax rate so you can quickly gauge the net profit retained.
How to Use It
Enter your taxable income — that is, revenue minus deductible business expenses and allowances — then enter the corporate tax rate as a percentage. The tool instantly returns the tax owed, the income remaining after tax, and the effective rate. Because rates vary by country and company size, always confirm the correct statutory rate for your jurisdiction and tax year.
The Formula Explained
The core calculation is straightforward for a flat-rate system: $$\text{Tax} = \text{Taxable Income} \times \frac{\text{Rate}}{100}$$ The after-tax income is then $$\text{After-Tax Income} = \text{Taxable Income} - \text{Tax}$$ This model assumes a single flat rate rather than progressive brackets, which is how many corporate tax systems (including the US federal system since 2018) operate.
Worked Example
Suppose a company has taxable income of $500,000 and the corporate tax rate is 21%. The tax owed is $$500{,}000 \times 0.21 = \$105{,}000$$ The after-tax income is $$500{,}000 - 105{,}000 = \$395{,}000$$ and the effective rate is \(21\%\).
FAQ
Does this account for tax brackets? No — it applies one flat rate. If your jurisdiction uses progressive brackets, use the blended or marginal rate that applies.
What counts as taxable income? Generally gross revenue minus allowable deductions, depreciation, and credits. This calculator assumes you have already computed that figure.
Is this tax advice? No. It is an estimate for planning. Consult a qualified tax professional for filing.
