Check your brokerage account for tax statements. Depending on what you invested in, you might have interest or dividends, and if you invested in mutual funds you might have capital gains.
In the simplest case where you buy a stock that pays no dividends, you only have a reportable event when you sell the stock (as a capital gain or loss). But if you invested in mutual funds, you can have reportable gains or losses in the fund even if you don't sell your shares, as well as dividends.
