Over the past 40 years, revenues have averaged a bit above 17 percent of GDP; they have ranged from nearly 20 percent of GDP in fiscal year 2000 to below 15 percent in fiscal years 2009 and 2010. In addition to projecting the future course of federal revenues, CBO analyzes the budgetary and economic effects of various features of the federal tax system and the effects of potential changes to current tax rules.

Use this menu to filter CBO's publications by topic. From January 2011 forward, all the agency's products are categorized by topic. Cost estimates released prior to the 112th Congress are not categorized by topic.