EFILE transmission service – Hours of operation
Outage (planned or unplanned)
EFILE will be undergoing scheduled maintenance from Friday, October 16, 2026, from 10:00 p.m. (Eastern time) until Sunday, October 18, 2026, at 6:00 a.m. (Eastern time). The service will be temporarily unavailable during this period.
If you experience technical difficulties after 6:00 a.m. (Eastern time) on Sunday, October 18, 2026, please contact the EFILE Helpdesk.
We apologize for any inconvenience and thank you for your patience.
The EFILE and ReFILE services are open for transmission from Monday, February 23, 2026 at 8:30 a.m. (Eastern time), until Friday, January 29, 2027. You can electronically file your clients' 2018, 2019, 2020, 2021, 2022, 2023, 2024 and 2025 initial personal income tax and benefit returns using EFILE service and you can file your clients' amended T1 returns for 2022, 2023, 2024 and 2025 using ReFILE.
The T3 EFILE service is open for transmission from Monday, February 23, 2026 at 8:30 a.m. (Eastern time), until Friday, January 29, 2027. Visit T3 EFILE Information web page for more details on the services available this year.
The services are available 21 hours a day. Due to daily maintenance activities, the services are not available for three hours a day from 3 am to 6 am (Eastern time).
| Time zone | Monday to Sunday |
|---|---|
| Pacific time | 3:00 a.m. to midnight |
| Mountain time | 4:00 a.m. to 1:00 a.m. |
| Central time | 5:00 a.m. to 2:00 a.m. |
| Eastern time | 6:00 a.m. to 3:00 a.m. |
| Atlantic time | 7:00 a.m. to 4:00 a.m. |
| Newfoundland time | 7:30 a.m. to 4:30 a.m. |