JustFax OnlineFax Numbers in Canada
Official fax numbers for government agencies, businesses, and institutions, with source and date checked
CRA Form RC1 (non-resident business number)
For non-resident businesses that cannot use the CRA's online non-resident form. Fax a completed Form RC1 to the Non-Resident Registration and Security unit at the Atlantic Tax Centre to register for a Canadian business number. Not for simplified digital-economy GST/HST or Underused Housing Tax accounts.
Source: canada.ca, checked November 1, 2026
CRA Sudbury Tax Centre (non-residents)
Canada Revenue Agency fax at the Sudbury Tax Centre for non-residents' income tax returns. The CRA calls this option temporary, so check its tax centres page before you send.
Source: canada.ca, checked November 1, 2026
CRA Winnipeg Tax Centre (non-residents)
Canada Revenue Agency fax at the Winnipeg Tax Centre for non-residents' income tax returns. The CRA calls this option temporary, so check its tax centres page before you send.
Source: canada.ca, checked November 1, 2026