Hours of service

GST/HST electronic filing is available seven days a week during the following hours:

  • Pacific time zone
    3:00 am to 11:30 pm
  • Mountain time zone
    4:00 am to 12:30 am
  • Central time zone
    5:00 am to 1:30 am
  • Eastern time zone
    6:00 am to 2:30 am
  • Atlantic time zone
    7:00 am to 3:30 am
  • Newfoundland time zone
    7:30 am to 4:00 am
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