The Capitals announced Friday that Carlson will earn $3.8 million in the upcoming season and $4 million each season from 2013-14 through 2017-18.
The 22-year-old Carlson had nine goals and 23 assists while playing in all 82 games last season. He ranked second on the team in ice time per game and led the club whith 153 blocked shots. He also had two goals and three assists in the playoffs.
Carlson had 37 points in 2010-11, when he was selected to the NHL's all-rookie team.
Carlson was the No. 27 overall pick by the Capitals in the 2008 draft.