Overhang seat in the context of "New Zealand Parliament"

The additional-member system (AMS) is a two-vote seat-linkage-based mixed electoral system used for elections to the Scottish Parliament in the United Kingdom, although not for Westminster elections, in which most representatives are elected in single-member districts (SMDs), and a fixed number of other "additional members" are elected from a closed list to make the seat distribution in the chamber more proportional to the votes cast for party lists. It is a form of mixed-member proportional representation and is distinct from using parallel voting for the list seats (also known as the supplementary-member system) in that the "additional member" seats are awarded to parties taking into account seats won in SMDs (referred to as compensation or top-up) – these are ignored under parallel voting, which is a non-compensatory method.

AMS is the name given to a particular system used in the United Kingdom that aims to provide proportional representation. However, in theory it can fail to be proportional. This is commonly caused by dis-proportional district results caused by seat overhang. The proportionality of AMS depends on having enough additional ("top-up") seats and on how votes are cast in a specific election. During its use in the United Kingdom, AMS produced results closer to mixed-member proportional rather than mixed-member majoritarian representation.

A federal election was held on 22 September to elect the members of the 18th Bundestag of Germany. At stake were all 598 seats to the Bundestag, plus 33 overhang seats determined thereafter. The Christian Democratic Union of Germany/Christian Social Union of Bavaria (CDU/CSU) of incumbent chancellor Angela Merkel won their best result since 1990 with nearly 42% of the vote and nearly 50% of the seats, just five short for an overall majority. The co-governing Free Democratic Party (FDP) failed to meet the 5% vote electoral threshold in what was their worst showing ever in a federal election at the time, the electoral wipeout denying them seats in the Bundestag for the first time in their history.

As the CDU/CSU's narrowly missed a majority, and the FDP failed to get any seats, any prospective government was required to be a new coalition. The only possible coalition government excluding the CDU/CSU would have been an all-left-wing red–red–green coalition, since a red–green alliance, similar to the German government between 1998 and 2005, would not have enough seats for a majority. Both the Social Democratic Party of Germany (SPD) and Alliance 90/The Greens ruled out governing with The Left that had ruled former East Germany. Ultimately, Merkel's party reached a coalition agreement with the then-main opposition party, the SPD, to form another grand coalition, the third in the country's history since World War II. The SPD leadership conducted a ratification vote by their broader membership before the agreement was made final. This grand coalition was renewed after the 2017 German federal election due to failure during the negotiations of a Jamaica coalition.

A federal election was held in Germany on 24 September 2017 to elect the members of the 19th Bundestag. At stake were at least 598 seats in the Bundestag, as well as 111 overhang and leveling seats determined thereafter.

The Christian Democratic Union of Germany and the Christian Social Union of Bavaria (CDU/CSU), led by incumbent chancellor Angela Merkel, won the highest percentage of the vote with 33%, though it suffered a large swing against it of more than 8%. The Social Democratic Party of Germany (SPD) achieved its second worst result since post-war Germany at 21%, undercut only by its 2025 result. Alternative for Germany (AfD), which was previously unrepresented in the Bundestag, became the third party in the Bundestag with 12.6% of the vote, whilst the Free Democratic Party (FDP) won 10.7% of the vote and returned to the Bundestag after losing all their seats in 2013. It was the first time since 1957 that a party to the political right of the CDU/CSU gained seats in the Bundestag. The other parties to achieve representation in the Bundestag were the Left and Alliance 90/The Greens, each close to 9% of the vote. In the 709 member Bundestag, a majority is 355 and the CDU/CSU won 246 seats (200 CDU and 46 CSU), the SPD 153, the AfD 94, the FDP 80, The Left 69, and the Greens 67.

The House of Representatives is the sole chamber of the New Zealand Parliament. The House passes laws, provides ministers to form the Cabinet, and supervises the work of government. It is also responsible for adopting the state's budgets and approving the state's accounts.

The House of Representatives is a democratic body consisting of representatives known as members of parliament (MPs). There are normally 120 MPs, though there are currently 123 due to overhang seats. Elections take place usually every three years using a mixed-member proportional representation system, which combines first-past-the-post elected seats with closed party lists. 72 MPs are elected directly in single-member electoral districts and further seats are filled by list MPs based on each party's share of the party vote. A government may be formed from the single party or coalition of parties that has the support of a majority of MPs. If no majority is possible, a minority government can be formed with a confidence and supply arrangement. If a government is unable to maintain the confidence of the House then an early general election can be called.