Calculating your after-tax return is straightforward once you know the After-Tax Return formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the After-Tax Return Calculator.
What is After-Tax Return?
The After-Tax Return calculation tells you your after-tax return from a few simple inputs. The figure you are solving for here is the after-tax return, expressed in percent.
The After-Tax Return formula
The core formula is:
After-tax return = Pre-Tax rate return × (1 - Tax rate ÷ 100)Here is what each input means:
- Pre-tax return — a percentage, such as an annual rate. Example: 1%.
- Tax rate — a percentage, such as an annual rate. Example: 3%.
How to calculate it step by step
- Write down the pre-tax return (for example, 1%).
- Write down the tax rate (for example, 3%).
- Apply the formula above to get your after-tax return.
- Double-check the result with the After-Tax Return Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Pre-tax return | 1% |
| Tax rate | 3% |
| After-tax return | 7.0000% |
With pre-tax return of 1% and tax rate of 3%, the after-tax return works out to 7.0000%.
Example 2
With pre-tax return of 2% and tax rate of 3%, the after-tax return works out to 14.0000%.
| Result | Value |
|---|---|
| After-tax return | 14.0000% |
Example 3
With pre-tax return of 5% and tax rate of 3%, the after-tax return works out to 3.5000%.
| Result | Value |
|---|---|
| After-tax return | 3.5000% |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
- Annual rates must be converted to the period you are calculating for (for example, divide an annual rate by 12 for a monthly figure).
Prefer not to do the maths by hand? — the After-Tax Return Calculator does it instantly, for free, with the formula and a worked example built in.
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