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Capital Gains Tax with Multiple 'buy' Transactions per Stock (U.S.)
According to the following article the answer is "first-in, first-out": http://smallbusiness.chron.com/calculate-cost-basis-stock-multiple-purchases-21588.html According to the following article the last answer was just one option an investor can choose: https://www.usaa.com/inet/pages/advice-investing-costbasis?akredirect=true