Every calculation runs inside your browser. Tax rates as of 2026-01-01 (last reviewed 2026-10-18). Tax rules follow the Korean system.
Calculate your new average cost after buying more, and how many shares you need to reach a target average.
Calculate your return from buy and current prices, a target price from a target return, and the rise needed to recover a loss.
Calculate dividends before and after tax and the dividend yield from shares held and dividend per share, with Korean and US withholding.
Combine gains and losses from several sales, subtract the basic deduction and calculate Korean capital gains tax and local income tax on foreign stocks.
Results are rounded to the nearest won, so they may differ by a few won from your broker’s or the tax office’s figures.
Tax rates and deductions can change with the law, so each calculator shows the reference date and whether each value has been checked.
Broker fees differ, so the defaults are only examples. Replace them with your own broker’s fees.