What is the confidence convention in Canada?

The confidence convention is the central constitutional convention of Canadian Westminster government: the Prime Minister and Cabinet must maintain the confidence of the elected House of Commons to remain in office. Loss of confidence (through a successful non-confidence motion or the defeat of a central government bill) triggers either the government's resignation or the dissolution of Parliament for a new election. The confidence convention is the foundational principle of responsible government in Canada and the British Westminster tradition more broadly.

Confidence votes in the federal House of Commons include explicit non-confidence motions, amendments to the Address in Reply to the Speech from the Throne, votes on the federal Budget and the Budget Implementation Act, the Estimates (Main and Supplementary), and any vote that the government has explicitly designated as a matter of confidence. Some other votes (such as particularly important policy bills) are also treated as confidence matters by political convention.

Notable confidence-vote losses in Canadian history include the 1926 King-Byng Affair (Prime Minister Mackenzie King lost a confidence vote and was refused dissolution by Lord Byng, leading to Arthur Meighen's brief Conservative government and a major constitutional crisis); the 1979 Joe Clark Conservative government's defeat on its first Budget (after only six months in office, losing 139-133 in the House); the 2005 defeat of Paul Martin's Liberal government (on a non-confidence motion that the sponsorship-scandal Auditor General report had triggered); and the 2011 defeat of Stephen Harper's Conservative minority on a contempt-of-Parliament motion.

The 2008 to 2009 prorogation crisis was a particularly dramatic test of the confidence convention. Prime Minister Stephen Harper, facing a likely non-confidence motion from a Liberal-NDP-Bloc Québécois coalition, requested Governor General Michaëlle Jean to prorogue Parliament to avoid the vote. The Governor General granted the request after about two hours of consultation. The prorogation gave the Conservatives time to regain political support, and the coalition was abandoned. The incident was widely debated as a test of the convention's limits. In a minority Parliament (such as the current 45th Parliament under Prime Minister Mark Carney), the governing party must work with opposition parties to maintain confidence on each major vote, often through informal agreements or formal confidence-and-supply agreements (such as the March 2022 to September 2024 Liberal-NDP Supply and Confidence Agreement).