It appears that as of November 2023, CRA has replaced the fax number for Client Services with the following:
- 833-339-0997 (toll-free number); or
- 418-556-1813
You should not be sending any faxes to the old 613 fax number. Actually registered charities should move over to the CRA MyBA system and then you will not have to fax anything! There are many other advantages of using the CRA MyBA.