

This is important, because gains from short-term transactions (you held the investment for 1 year or less) are typically taxed at a much higher rate than long-term holdings (more than 1 year). Here’s where your short-term and long-term transactions are summarized. Short-term and long-term transactions column Worst-case scenario, you have to assume the full amount of the sale is a capital gain.ĥ. In this case, you have to figure it out on your own, by digging up your old records or contacting your previous broker. When a cost basis is "unknown," it’s typically because the investment was transferred from another broker or account. Your cost basis represents your initial investment, including investing costs and adjustments.
