Washington, D.C. is not a state and therefore has no federal voting representation in Congress. The city's residents elect a non-voting delegate to the House of Representatives (D.C. at-large), who may sit on committees, participate in debate, and introduce legislation, but cannot vote on the House floor. The district has no official representation in the United States Senate. Neither chamber seats the district's elected "shadow" representative or senators. Unlike residents of U.S. territories such as Puerto Rico or Guam, which also have non-voting delegates, D.C. residents are subject to all federal taxes. In the financial year 2012, D.C. residents and businesses paid $20.7billion in federal taxes, more than the taxes collected from 19 states and the highest federal taxes per capita.