This service is not available 24 hours a day due to daily maintenance activities. Tax returns and SEND requests may be filed over the Internet during the following hours.
| 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. |