The effective rate is often below the statutory rate because of credits, deductions, lower foreign rates and timing differences, or above it because of non-deductible expenses and state taxes.
How to use the Effective Corporate Tax Rate Calculator
- Earnings before tax
- Income tax paid
- Statutory rate to compare
Results update as you type, and every field accepts the units shown in its menu.
How it works
Enter earnings before tax and income tax paid (or tax expense), and the statutory rate to compare with.
Tips
- Use figures for the same period (a month, a quarter or a year) for every input so ratios compare like with like.
- Track the metric over time – the trend usually tells you more than a single value.
- Compare your result with industry benchmarks, which vary a lot between sectors.
- Treat the result as a starting point for a decision, then check the assumptions behind each input.
Common mistakes to avoid
- Mixing monthly and yearly numbers in the same calculation.
- Using revenue where the formula needs profit (or the other way round).
- Forgetting hidden costs such as taxes, fees, overheads or your own time.
Inputs explained
| Field | What to enter |
|---|---|
| Earnings before tax | Amount in your currency |
| Income tax paid | Amount in your currency |
| Statutory rate to compare | In % |
What each result means
- Effective corporate tax rate = [Income tax paid]÷[Earnings before tax]×100
- Difference from statutory rate = [Effective corporate tax rate] – [Statutory rate to compare]
- Net income after tax = [Earnings before tax] – [Income tax paid]
Example values
How the main result changes when Earnings before tax changes and everything else stays at the example values above:
| Earnings before tax | Effective corporate tax rate (%) |
|---|---|
| 750,000 | 36.67 |
| 1,125,000 | 24.44 |
| 1,500,000 | 18.33 |
| 1,875,000 | 14.67 |
| 2,250,000 | 12.22 |
| 3,000,000 | 9.17 |
Formula
Effective tax rate = income tax expense ÷ earnings before tax × 100Worked example
Inputs — Earnings before tax: $1,500,000; Income tax paid: $275,000; Statutory rate to compare: 21 %.
Results — Effective corporate tax rate = 18.33 %; Difference from statutory rate = -2.67 percentage points; Net income after tax = $1,225,000.00.
Frequently asked questions
What is the U.S. corporate tax rate?
21% federal since 2018, plus state corporate taxes of 0–11.5%.
Why is the effective rate lower than 21%?
Credits (such as R&D), deductions and lower-taxed foreign income.
Which figure should I use for tax?
Tax expense from the income statement, or cash taxes paid for a cash view.
What formula does the Effective Corporate Tax Rate Calculator use?
Effective tax rate = income tax expense ÷ earnings before tax × 100.