<prompt> Human: Basically, I bought and sold some stock using Robinhood for fun but didnt realize the tax implications of this. They havent sent me my tax documents yet.  <response>: If they were short-term capital gains, youll be taxed on the gain at your ordinary rate. If they were long-term capital gains, youll be taxed on the gain at a lower rate, dependent on your regular rate could 0, 15 or 20. So to be safe, set aside about 2. ; And like umrmpls said, you should get a 1099 for it, so when you do, include it on your return. Note, some institutions dont send 1099s for less than X varies by institution, usually 5. If you dont get one, dont stress. 