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Supreme Court invalidates result from spring federal election in Terrebonne riding
The court said a known postal-code mistake could not decide a federal election and overturned a Superior Court ruling.
- The Supreme Court of Canada invalidated the 2025 federal election result in the Terrebonne riding, ruling the decision necessary to protect public trust in the electoral process.
- Justice Mahmud Jamal wrote that an Elections Canada employee knew for weeks voters received envelopes with incorrect postal codes, yet the agency failed to correct the error before voting.
- Bloc candidate Nathalie Sinclair-Desgagn challenged her one-vote loss after a supporter's mail-in ballot went uncounted, prompting the Supreme Court to reverse a Superior Court ruling.
- Liberal Tatiana Auguste originally won the seat by one vote in April 2025; she subsequently won the riding again during a byelection held on Tuesday, April 14, 2026.
- The court concluded that annulling the result ensures federal elections are not determined by known, correctable administrative errors, affirming electoral integrity requires agencies to act when flaws are identified.
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25 Articles
25 Articles
The Toronto Star+21 Reposted by 21 other sources
Supreme Court explains why it invalidated Terrebonne results in 2025 federal election
MONTREAL - The Supreme Court of Canada says it decided to invalidate a federal Liberal candidate's one-vote victory in the 2025 federal election to ensure public trust in the electoral
·Toronto, Canada
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The error of Elections Canada in the federal election in the electoral district of Terrebonne, won by a single vote by Liberal Tatiana Auguste on April 28, 2025, was serious enough to justify the annulment of the election by the Supreme Court.
·Montreal, Canada
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GATINEAU, QC, Sept. 18, 2026 /CNW/ -- Elections Canada will carefully analyze today's Supreme Court of Canada decision.
·Montreal, Canada
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Total News Sources25
Leaning Left15Leaning Right0Center8Last UpdatedBias Distribution65% Left
Bias Distribution
- 65% of the sources lean Left
65% Left
L 65%
C 35%
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