When is the deadline to file my personal tax return in Ontario?

For most Ontario residents, the deadline to file your T1 personal income tax return is April 30 of the following year. For example, your 2025 return is due by April 30, 2026. If April 30 falls on a weekend, the CRA typically extends the deadline to the next business day.

If you or your spouse or common-law partner is self-employed, the filing deadline for both of your returns is extended to June 15. However — and this is a critical distinction — any taxes owing must still be paid by April 30 regardless of the June 15 filing date. Filing late when you owe tax triggers late-filing penalties and interest that accrue immediately after April 30, even if you file by June 15.

If you cannot file on time, you should still pay an estimate of what you owe by April 30 to stop the penalty and interest clock. The CRA can also be contacted about payment arrangements if you cannot pay the full amount. There is no Ontario-specific filing deadline separate from the federal deadline — the T1 covers both, so one return and one due date apply.