Electoral system for national legislature

The Business Times, Thai Parliament passes election changes favouring ruling party, SEP 10, 2021; accessed 11 May 2023

Of the 500 members to be elected, 400 are elected from single-member constituencies using first-past-the-post voting, and 100 are elected from party-list seats. The reform of 2021 re-instituted parallel system, in which 100 PR seats are no longer serve as levelling seats.