How are short-term gains with stocks taxed? And what is the % that it's taxed?

They are taxed as Ordinary Income which is your normal rate. Long Term Gains are taxed at lower rates. For example, if you are in the 28% bracket, a ST Gain is taxed at 28%, but a long term gain is taxed at lower rates. LTCG rates: 5% for taxpayers in the 10% and 15% tax brackets (zero percent starting in 2008) and 15% for taxpayers in the 25%, 28%, 33%, and 35% tax brackets,
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Google "short term capital gains."