A postal code error in Quebec delayed special ballots, leading to a disputed election result and a pending court hearing.

A postal code error on special ballot return envelopes in Terrebonne, Quebec, went unreported for nearly three weeks after being discovered on April 6, 2025, with an election employee replacing affected envelopes but not informing superiors. The issue emerged publicly on May 12 following a media inquiry. The Bloc Québécois candidate Nathalie Sinclair-Desgagné, who lost by one vote, challenged the result, alleging the error may have prevented at least one voter from submitting a ballot. Of 116 special ballots requested, 19 were not returned on time and five arrived late, yielding a 72% return rate below the national average. Elections Canada has launched a broader investigation into special ballot issues from the 2025 election, and a judge will hear the case starting October 20 in St-Jérôme, Quebec.