Affidavits in Canada sit at the meeting point of federal and provincial law, and getting the source right is the difference between an admissible document and a wasted trip to the commissioner. At the federal level, section 41 of the Canada Evidence Act, RSC 1985, c. C-5, prescribes the form of solemn declarations and recognises the authority of notaries, justices of the peace, commissioners and other functionaries to receive them. The full statutory text is available through the federal government's consolidated Canada Evidence Act published on the Justice Laws Website, the authoritative source for the federal wording. When an affidavit is filed in a federal matter, immigration proceeding or citizenship application, this is the governing instrument.
Most affidavits, though, are sworn for use in provincial courts and administrative bodies, and here each province sets its own rules. In Ontario, the content and form are governed by Rule 4.06 of the Rules of Civil Procedure, RRO 1990, Reg. 194, which confines an affidavit to facts within the deponent's personal knowledge, allows statements of information and belief only where the source is disclosed, and dictates how exhibits are marked. The persons who may take an affidavit are set out in the provincial Commissioners for Taking Affidavits Act and the Notaries Act, and every practising lawyer and paralegal in Ontario is automatically a commissioner. British Columbia takes a parallel route through its Evidence Act, RSBC 1996, c. 124, which at section 60 deems barristers, solicitors, registrars and certain officials to be commissioners by virtue of their office. The other common-law provinces follow the same pattern under their respective evidence and commissioners statutes.
What unites every province is the execution requirement. The deponent must sign the affidavit in the physical or authorised remote presence of the official, who then completes and signs the jurat. An affidavit signed beforehand and merely shown to a commissioner is a nullity. Several provinces now permit remote commissioning by video, Ontario doing so through O. Reg. 431/20, provided the rule's identity and process safeguards are met. The same execution discipline you will see in a properly drafted separation agreement for Canadian families applies here, because in both cases the signature is the source of the document's legal force.