From what I see, it's not always easy to find clear information, so this is a simple place to start.
| Topic | Who it applies to | Due date |
|---|---|---|
| Personal income tax return | Most individuals | April 30 (file and pay) |
| Personal income tax return | Sole proprietors | June 15 to file · April 30 to pay |
| GST/HST return & payment | Monthly filers | 1 month after period end |
| GST/HST return & payment | Quarterly filers | 1 month after period end |
| GST/HST return | Annual filers (Dec 31 year-end) | June 15 to file · April 30 to pay |
| GST/HST return & payment | Annual filers (other year-end) | 3 months after fiscal year-end |
| T2 corporation tax return | Corporations | 6 months after fiscal year-end |
| Corporation tax balance | Corporations | 2–3 months after fiscal year-end |
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