Leveling seats (Esperanto: Egaligantaj sidejoj, literally "Equalizing seats"), also known as compensatory seats or top-up seats, are an election mechanism employed in Bijan at all elections to the House of Representatives since 1965. Leveling seats are seats of additional members of the House elected to supplement the members directly elected by each constituency. The purpose of the leveling seats is to ensure that each party's share of the total seats is roughly proportional to the parties' overall shares of votes at the national level.