Due dates by quarter
Specified QST and simplified GST/HST returns follow calendar quarters. Revenu Québec and the CRA list these due dates: April 30 (January–March), July 31 (April–June), October 31 (July–September) and January 31 (October–December). Businesses under the general QST system or the normal GST/HST regime file on the frequency the agency assigned them. Check the official pages for your own due dates.
Now onboarding for the October–December 2026 quarter.
Quarterly specified QST and simplified GST/HST returns for that quarter are due .
See Revenu Québec and CRA due dates: Revenu Québec · CRA
Official sources
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