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

Each constituency is allocated a fixed number of seats: 85 for Barcelona, 17 for Girona, 15 for Lleida and 18 for Tarragona.

[2][3] Voting is on the basis of universal suffrage, which comprises all nationals over eighteen, registered in Catalonia 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.

[2][3] The use of the D'Hondt method may result in a higher effective threshold, depending on the district magnitude.