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The Majority Requirement in the House of Commons: Evaluating the 173-Seat Threshold
The Supreme Court's overturning of a by-election result increases the government’s effective majority to 173 seats amid three vacant House of Commons seats.
- On April 13, the Terrebonne by-election will determine whether the House of Commons splits 172–171, creating a razor-thin margin that complicates the Liberal government's ability to pass legislation.
- The Supreme Court of Canada invalidated the April 2025 results due to irregularities, in which the Liberals had won the North Shore riding by a single vote over Bloc Québécois candidate Nathalie Sinclair-Desgagné.
- Speaker Francis Scarpaleggia's office confirmed he would follow established practice, using his "casting vote" only to maintain the status quo during ties, per the "House of Commons Procedure and Practice, 4th edition."
- University of Ottawa professor Geneviève Tellier notes the government appears willing to use all tactical options to stay in power, as confidence and financial votes pose the greatest risk to parliamentary survival.
- Parliamentary rules dictate that 172 seats do not grant a "free hand" to govern; a majority of the 343 total seats is required, and with three vacancies, consensus-building becomes essential.
31 Articles
31 Articles
172 seats won't be enough for a Liberal majority in Canada's current Parliament — Here's why
Contrary to popular belief, the choice made by voters in the Montreal-area riding of Terrebonne in the April 13 by-election will have major implications on moving bills forward in the House of Commons.The rules of procedure in the Commons mean that, in this current Parliament, the magic number allowing a government to have a free hand is not 172 seats — a majority of the 343 seats — but actually 173.Currently, three seats are vacant. Observers a…
The Toronto Star
Majority in the House of Commons: is the real magic number actually 173 seats?
OTTAWA - Contrary to popular belief, the choice made by voters in the Montreal-area riding of Terrebonne in the April 13 byelection will have major implications on moving bills forward
A single Quebec by-election could decide if Mark Carney's Liberals get a 'real' majority
Contrary to popular belief, the choice made by voters in the Montreal-area riding of Terrebonne in the April 13 by-election will have major implications on moving bills forward in the House of Commons.The rules of procedure in the Commons mean that, in this current Parliament, the magic number allowing a government to have a free hand is not 172 seats — a majority of the 343 seats — but actually 173.Currently, three seats are vacant. Observers a…
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