How to read the result
Net profit includes both trading fees and the simple tax assumption. ROI measures that profit against purchase cash, while break-even solves for the sell price that recovers purchase cost and transaction fees before tax.
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Calculate stock profit after trading fees and estimated tax
Stock profit is sale proceeds minus purchase cost, buy and sell fees, and any modeled tax on a positive gain. Enter the two prices and number of shares to see net profit, return on cash invested and the sell price needed to break even. Scenario cards show how the result changes at nearby exit prices.
How to use this calculator
- Enter execution prices and share quantity rather than the order's unfilled limit price.
- Copy each side's percentage fee or leave it at zero for commission-free trading.
- Treat the tax slider as a scenario and compare the result with the rules for your account and jurisdiction.
What this estimate does not capture
The estimate excludes fixed fees, bid-ask spread, currency conversion, tax lots, loss offsets and holding-period rules. Actual proceeds can differ from a quote because of execution price and liquidity.
UNDERSTAND THE NUMBERS
A 10% price rise is not a 10% net return
Fixed educational example · independent of your inputs above. $ means US dollars; these are not current rate quotes or return forecasts.
Buy 100 shares at $100 and sell at $110. Assume a 0.1% fee on each side and a hypothetical 20% tax on the positive gain after fees. This tax rate is an example, not a jurisdiction's rule.
| Step | Amount | What it includes |
|---|---|---|
| Price gain | $1,000 | Before fees and tax |
| Costs | $216.80 | $21 fees + $195.80 tax |
| Net profit | $783.20 | 7.82% on cash invested |
What the difference tells you
The return denominator includes the buy fee: $10,010 was committed to the trade. Break-even is about $100.20 because the sale must recover both transaction fees. A loss does not produce a tax refund in this model.
Before drawing a conclusion
The result is a return for the entire holding period. A gain over one month and the same gain over three years are not equivalent annual performances. Tax allowances, loss offsets and holding-period rules are outside this estimate.
A comparison to try
Compare sale prices just below and above break-even, then change only the fee rate. This separates market movement from the cost of executing the trade.
Combine multiple purchase lots first →References for this explanation
Prepared by EconoPi · examples and explanations reviewed September 19, 2026. Tables are our calculations under stated assumptions, not forecasts or recommendations by the referenced organizations.
Frequently asked questions
How is stock profit calculated?
Net profit equals sell price × shares, minus buy price × shares, transaction fees and the estimated tax entered for a positive gain.
What is return on investment?
ROI is net profit divided by the original cash invested, including the modeled purchase fee, expressed as a percentage.
Why is break-even above my buy price?
When fees apply, the sale must recover both the purchase cost and transaction charges before net profit reaches zero.
Does this calculate capital gains tax exactly?
No. Tax depends on residence, account, holding period, other gains and losses, and deductions. The tax slider is only a simple scenario assumption.
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