23 seats are elected by party-list proportional representation with a 5% electoral threshold, with the other half elected in 22 single-member constituencies by first-past-the-post voting.

Seats in the proportional part are allocated using the Imperiali quota, modified to ensure that every party list, which passes the threshold, receives at least one mandate.

The following parties were relieved from the necessity to collect signatures:[2] New People will take part in Irkutsk Oblast legislative election for the first time, while Rodina, who participated in the last election, did not file.

22 single-mandate constituencies were formed in Irkutsk Oblast.

Aleksandr Vedernikov (United Russia) was re-elected as Chairman of the Legislative Assembly,[4] while incumbent Senator Sergei Brilka (United Russia) was re-appointed to the Federation Council.