From the Document: "Since the financial crisis and the ensuing 2008-2009 Great Recession, the idea of imposing a tax on financial transactions has appeared somewhat frequently in policy debates. At its most basic level, a financial transaction tax (FTT) is a tax imposed on the buyer or seller of a security at the time a financial transaction occurs. An FTT can be applied across the board to all financial transactions, or only those involving specific types of securities (for example, stocks, options, and futures, but not bonds). Similarly, an FTT can be applied to the transactions of all traders, or selectively to only certain types, such as those made by institutional traders but not individual investors."
CRS Report for Congress, R42078
Congressional Research Service: https://crsreports.congress.gov/