|Part of the Politics series|
The spare vote is a version of single transferable voting applied to the ranking of parties, first proposed for elections in Germany in 2013. This ranked proportional representation electoral system is applying to political parties instead of individual candidates. The spare vote refers to a secondary vote (preference) of the voter, which only comes into play if the first preference, the political party preferred by the voter, is below the electoral threshold. In Germany, there were draft laws for the spare vote system in Saarland, Schleswig-Holstein and Brandenburg federal states, but they were not implemented.
Under party-list proportional representation with a threshold, the fraction of unrepresented votes due to the electoral threshold can reach up to 5-30% and represents a democratic deficit as measured by disproportionality. Despite this, a spare vote is not a feature in any list PR system in use as of this date. The German Federal Constitutional Court ruled that the electoral system is not required to have such a supplementary contingent vote feature.
The term "spare vote" not only refers to the additional specification of a second preference but can also mean the electoral system working with a second preference as a whole. Not every second preference is a spare vote. Ranked voting systems differ in terms of their field of application, choice of party lists vs. choice of individuals. In particular, the following ranking procedures should be strictly distinguished from the spare vote:
The electoral threshold typical in party-list proportional representation and mixed-member proportional representation causes tactical voting and spoiler effects. Voters instead of casting their vote for a preferred party that presumably will fail to pass the electoral threshold tend to choose a less preferred party with a reliable chance of passing the electoral threshold. The security of the spare vote is intended to encourage voters to vote more honestly for their actually preferred party. On the ballot paper, the voter is given the opportunity to designate beside the first preference the spare vote, which becomes an effective vote only under the condition that the first preference fails to comply with the electoral threshold. To prevent that the spare vote falls below the electoral threshold as well, the voter should assign the spare vote to a party that is very likely to pass the electoral threshold. The spare vote continues to prevent the fragmentation of parliaments achieved by the electoral threshold.
There are different methods for evaluating the spare votes:
In addition to the allocation of a single spare vote, it is also conceivable that the voters rank several spare votes/parties according to their preferences. In this process, a voter's party vote is carried over until it either goes to a party that is above the electoral threshold or has passed through all of the voter's stated preferences.
The spare vote can also be used in the proportional part of mixed electoral systems with electoral thresholds, and some mixed systems operate on the basis of an indirect spare party vote (mixed single vote) to reuse the candidates that did not receive a direct mandate in favour of the party list they are affiliated with. The second vote under mixed-member proportional systems may be considered a direct spare vote for a party, but not relating to the electoral threshold, but for the case when a voters favourite local candidate does not win in their district. This is also the case for the party list preference in the mixed ballot transferable vote (MBTV), which is may also use a ranked ballot capable of functioning a contingent party vote if combined with an electoral threshold. It is also the mixed equivalent of the spare vote (and STV, the non-partisan equivalent of the spare vote), meaning the spare vote is used in a two-tier election, and the spare vote is used on the upper (party-list) tier only if it would be wasted on the lower (candidate-based) tier. The process is the same as under the positive vote transfer mechanism of the mixed single vote (MSV), except under MSV, voters do not get to choose their party preference, it is defined by the candidate vote.