Electoral threshold

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The electoral threshold, or election threshold, is the minimum share of all the votes cast that a candidate or political party requires to achieve before they become entitled to representation or additional seats in a legislature. This limit can operate in various ways, e.g. in party-list proportional representation systems where an electoral threshold requires that a party must receive a specified minimum percentage of votes (e.g. 5%), either nationally or in a particular electoral district, to obtain seats in the legislature. In single transferable voting, the election threshold is called the quota and it is possible to pass it by use of first choice votes alone or by a combination of first choice votes and votes transferred from other candidates based on lower preferences (and in the last resort to fill the target number of seats, it is possible to be elected under STV even if a candidate does not pass the election threshold). In mixed-member-proportional (MMP) systems the election threshold determines which parties are eligible for top-up seats in the legislative body (but some MMP system still allow a party to retain the seat they won in their electoral district even when they did not receive the threshold nationally).

The effect of this electoral threshold is to deny representation to small parties or to force them into coalitions, with the presumption of rendering the election system more stable by keeping out fringe parties. Proponents say that simply having a few seats in a legislature can significantly boost the profile of a fringe party and that providing representation and possibly veto power for a party that receives only 1 percent of the vote is not appropriate.^[1] However, others argue that in the absence of a ranked ballot or other proportional systems, supporters of minor parties are effectively disenfranchised when barred from the top-up seats and are denied the right to be represented by someone of their choosing.

Two boundaries can be defined—a threshold of representation is the minimum vote share that might yield a party a seat under the most favorable circumstances for the party, while the threshold of exclusion is the maximum vote share that could be insufficient to yield a seat under the least favorable circumstances. Arend Lijphart suggested calculating the informal threshold as the mean of these.^[2]

The electoral threshold is a barrier to entry for political parties to the political competition.^[3]