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Canada deserves to know.
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A House of Commons seat becomes vacant when a member dies, resigns, or accepts an office that disqualifies them from sitting. The machinery that follows is set out in the Parliament of Canada Act and the Canada Elections Act: the Speaker addresses a warrant to the Chief Electoral Officer notifying them of the vacancy, and a writ for a byelection must then be issued between the 11th day and the 180th day after the Chief Electoral Officer receives that warrant. Inside that window, the timing belongs to the Governor in Council — in practice, the Prime Minister — and the campaign that follows must run at least 36 days before voting day. Add it up and a riding can lawfully go more than half a year without a voice in the House. If Parliament is dissolved for a general election before a byelection is held, the byelection writ is deemed withdrawn and the seat is simply filled at the general election. Byelection winners are full members of Parliament in every respect. What byelections signal is a murkier question: turnout is typically far below general-election levels, local candidates and local grievances loom large, and voters know they are not choosing a government — which makes byelections a real test of party organization and a genuine seat in the House, but an unreliable predictor of the next general election.
A Canadian federal election fills the seats of the House of Commons — 343 of them as of the 2023 redistribution. Each seat represents a riding (electoral district), and voters in each riding choose among local candidates. The candidate with the most votes in a riding wins it outright; this is first-past-the-post (single-member plurality), and a winner needs only more votes than any rival, not a majority. Canadians do not directly vote for the Prime Minister or the government; the party (or coalition) that can command the confidence of the House — usually the one with the most seats — forms government, and its leader becomes Prime Minister. Elections are triggered by the Governor General dissolving Parliament on the Prime Minister's advice, subject to the fixed-election-date law (a default date that does not prevent an earlier call). The independent, non-partisan agency Elections Canada, led by the Chief Electoral Officer (an officer of Parliament), administers the vote. Because first-past-the-post translates votes to seats riding-by-riding, the national seat share routinely diverges from the national vote share — a party can win the most seats without the most votes, and small vote swings can produce large seat swings.