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Selling stocks - capital gains
In the US you specify explicitly what stocks you're selling. Brokers now are required to keep track of cost basis and report it to the IRS on the 1099-B, so you have to tell the broker which position it is that you're closing. Usually, the default is FIFO (i.e.: when you sell, you're assumed to be closing the oldest position), but you can change it if you want. In the US you cannot average costs basis of stocks (you can for mutual funds), so you either do FIFO, LIFO (last position closed first), or specify the specific positions when you submit the sale order.