Majority bonus system

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The majority bonus system (MBS) is a form of semi-proportional representation used in some European countries. Its feature is a majority bonus which gives extra seats or representation in an elected body to the party or to the joined parties with the most votes with the aim of providing government stability.

It is used in Armenia, Greece, Italy, and San Marino.


Benito Mussolini was the first politician to enact a law to give automatic seats to the winning party and ensured his victory in the Italian election of 1924. The majority bonus system was used again after the restoration of the democracy but within basic limits, awarding a number of seats to allow government stability but not large enough to allow a single party to promulgate constitutional changes. It was used in Italian local elections in the 1950s and was reintroduced for local elections in 1993 and national ones in 2005 to replace the additional member system. After a 2013 ruling from the Constitutional Court[1] stating that unlimited bonuses are unconstitutional, a 40% minimum threshold for the assignment of the bonus has been established, with a runoff ballot between the two most voted parties if the threshold is not reached.

The MBS was adopted by other European countries, especially Greece in 2004 and San Marino at the national level, and France for its regional elections.


It can be based on any form of mechanism used in party-list proportional representation, but a D'Hondt method is most likely, as it will rank seats in an exact order of vote share.

Basically, there are two different forms of majority bonus systems, with clearly different political results:

  • The bonus system adds a fixed additional amount of seats to the winning party or alliance. In the Greek Parliament, where it is sometimes called reinforced proportionality, a sixth of the assembly seats are reserved to the winning party. In the Sicilian Regional Assembly, a tenth of the assembly seats are reserved to the winning coalition. If the system is always non-proportional for the final result, it does not ensure government stability if the winners do not obtain sufficient proportional seats.
  • The jackpot system delivers a fixed number of total seats to the winning party or alliance regardless of their relative votes. In the Sammarinese Parliament, the winning alliance obtains the 58% of the total seats, but the bonus seats for winners are deducted from the worst minority seats ranked using the D'Hondt method.

meanwhile the jackpot system assures a majority to the winner, the bonus system is more democratic as it doesn't give a fixed majority of seats.[incomprehensible] In the Italian election of 2013, the Democratic Party won 292 seats in the House using its 8,644,523 votes and so needed 29,604 preferences to obtain a seat. Its major opponent, The People of Freedom, won 97 seats with 7,332,972 votes and so needed 75,597 votes for a single seat. Effectively, the system in use in Italy until 2013, which assigned the jackpot regardless of the percentage of vote achieved by the largest party, has been judged as unconstitutional by the Italian Constitutional Court[2].


  1. ^ The ruling awaited in Palace of Consulta after the public hearing on 3 December 2013 could cause an earthquake the Italian public scene, changing some of coordinates that determine the behavior of politicians and the electorate: Buonomo, Giampiero (2013). "La legge elettorale alla prova di costituzionalità". L’Ago e il filo edizione online.   – via Questia (subscription required)
  2. ^ Unconstitutionality sentence by the Italian Constitutional Court

Caciagli, Mario; Alan S. Zuckerman; Istituto Carlo Cattaneo (2001). Italian Politics: Emerging Themes and Institutional Responses. Berghahn Books. pp. 87–89.