Stock Profit Calculator (After Fees and Tax)

What this tool does

A trade has to beat its own costs before it makes anything: with fees on both sides, the break-even price is a little above what you paid, and on small orders a fixed commission can eat a surprising share of the gain. Tax applies only to a gain, after fees; this calculator charges a flat rate, as in Portugal, where gains on shares are taxed at 28 % unless you choose to aggregate them with other income. Many countries instead tax by holding period, allow losses to offset other gains or exempt small amounts, so check the rules where you are taxed. Dividends received while holding and currency effects on foreign shares are not included.

Formula

profit = shares × (sell − buy) − commissions − tax on the gain

Variables

Worked example

Limitations

• This is an informational calculator, not personalised financial advice. Rates, fees, taxes and contract conditions vary between institutions and countries.
• Tax rates and rounding rules differ between countries and sometimes between regions. Use the rate that applies to your invoice.