If your net tax owing topped $3,000 ($1,800 in Quebec) in 2026 AND in either 2025 or 2024, the CRA can require you to pay in quarterly instalments — not one April lump sum.
📅 Due dates: March 15, June 15, September 15, December 15. The CRA sends you a reminder with the amount, and late or short payments can draw interest and penalties.
📌 General info only — every situation is different.