If you hold the stock for less than a year before selling for a profit, then it will be taxed at the short term capital gains rate which is the same as the tax rate on ordinary income, which maxes out at 36% right now and 39.5% next year. If you hold the stock for longer than a year before selling for a profit then it will be taxed at the long term capital gains rate which right now is 15% and will be 20% next year. This is the difference and one thing that needs to be considered anytime you sell stock.
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