Typically, they occur when the incumbent has resigned or died, but it may also occur in the case of a recall or as a result of election results being invalidated by voting irregularities.
It’s also frequently referred to as a special election.
Unlike general elections that are scheduled periodically and involve all constituencies, by-elections are unscheduled, occurring as and when the need arises, and they concern only the specific constituency or constituencies where the vacancy has arisen.
Purpose of “By-Elections”
By-elections are an important part of democratic governance, as they ensure that every constituency remains represented in the legislature at all times.
They allow for the smooth functioning of the democratic system by filling gaps that could otherwise disrupt legislative activities.
By-elections can also serve as a barometer of public opinion midway through a government’s term, potentially indicating shifts in voter sentiment since the last general election.
Procedures and regulations for by-elections vary from country to country.
Some countries mandate by-elections to fill any vacancy, while others may allow the political party of the departing legislator to appoint a successor, or leave the seat vacant until the next general election.
The campaigning process, voting methods, and eligibility criteria for candidates are generally the same as those for a general election in the respective jurisdiction.
While they are typically localized events, the political significance of by-elections can extend far beyond the constituencies in which they occur.
For instance, they can influence the balance of power in a legislature if the ruling party or coalition has a slim majority.
They can also affect the political dynamics within parties, influencing leadership contests or policy debates.
Use of “By-Election” in a sentence
Reuters (February 24, 2017): “Britain's ruling Conservatives won a parliamentary by-election in the north-west English region of Copeland on Friday, taking control of a once safe seat held by the opposition Labour Party and the first such gain by a ruling party since 1982.”
Malay Mail (June 24, 2022): “British Prime Minister Boris Johnson looked set for a chastening defeat in a parliamentary by-election today as the centrist Liberal Democrats claimed a 'historic victory' in what had been a safe Conservative seat.”
ABC News (August 30, 2026): “WA Labor Premier Roger Cook had repeatedly described the by-election as a 'fight for our lives', given the threat posed by One Nation.”