The Chamber of Deputies comprises 130 seats, elected using the additional member system: 70 deputies are elected to represent single-member electoral districts, 7 of which are Indigenous or Campesino seats elected by the usos y costumbres of minority groups, 60 are elected by proportional representation from party lists on a departmental basis. Deputies also serve five-year terms, and must be aged at least 25 on the day of the election. 