The electoral system uses the D'Hondt method and a closed-list proportional representation, with a minimum threshold of three percent.

The Statute provided for the five provinces in Castilla–La Mancha—Albacete, Ciudad Real, Cuenca, Guadalajara and Toledo—to be established as multi-member districts in the Cortes of Castilla–La Mancha, with this regulation being maintained under the 1986 regional electoral law.

In 1983 and from 1998 to 2014, each constituency was allocated a fixed number of seats: 9 for Albacete (10 from 1998 to 2014), 10 for Ciudad Real (11 from 1998 to 2012; 12 until 2014), 8 for Cuenca (8 from 2012 to 2014), 7 for Guadalajara (8 from 2007 to 2012; 9 until 2014) and 10 for Toledo (11 from 1998 to 2007; 12 from 2007 to 2012; 13 until 2014).

[2][3] Voting is on the basis of universal suffrage, which comprises all nationals over eighteen, registered in Castilla–La Mancha and in full enjoyment of their political rights.

[4][5] Seats are elected using the D'Hondt method and a closed list proportional representation, with an electoral threshold of three percent of valid votes—which includes blank ballots—being applied in each constituency.