The application fee is administrative and can be changed by an Order from the "Governor in Council,"
NO parliamentary action necessary. (In practical terms the "Governor in Council" is merely the PM in consultation with select Cabinet members and the PM's office, meaning mostly it is the PM's decision.)
In particular, Section 27(1) in the Citizenship Act specifically provides, in 27(1)(b), that the "
Governor in Council may make regulations . . . respecting fees for services provided in the administration of this Act . . . " see
https://laws-lois.justice.gc.ca/eng/acts/C-29/page-8.html?txthl=fees#s-27 . . . consistent with the many particular administrative matters which may be governed in regulations made by the Governor in Council (ranging from test criteria regarding knowledge of Canada to ceremonial procedures, but also including matters like the control of information as well as factors for determining if and when a hearing is required, among many others).
The latter puts decision-making about fees in perspective: the same authority for determining test questions is all that is needed to decide what the application fees are.
In any event, again,
NO Parliamentary action is necessary for Trudeau to revise the fees, not even any consultation let alone vote.
Current application fee is $530 for adult applicants applying under Section 5(1) in the Citizenship Act.
Some particulars and technicalities:
The Right of Citizenship fee, $100, is specifically prescribed by Section 32 Citizenship Regulations. See
https://laws-lois.justice.gc.ca/eng/regulations/SOR-93-246/page-4.html#docCont
The application for grant citizenship fee is prescribed by a schedule of fees, a subsection of Section 31 in the Citizenship Regulations; in addition to the above link, for Section 31 itself, for the schedule see
https://laws-lois.justice.gc.ca/eng/regulations/SOR-93-246/page-5.html#docCont
Section 2 of Citizenship Regulations, No. 2 govern the requirements for making a grant citizenship application (grant citizenship application under Section 5(1) in the Citizenship Act), and this regulation includes subsection 2(1)(i), which specifies that evidence of fee payment is required to make a grant citizenship application, referring to Sections 31 and 32 in the Citizenship Regulations. See
https://laws-lois.justice.gc.ca/eng/regulations/SOR-2015-124/page-1.html#h-816809
Section 13(c) in the Citizenship Act also prescribes that fees must accompany ANY application for it to be "
accepted for processing." See
https://laws-lois.justice.gc.ca/eng/acts/C-29/page-5.html?txthl=fees#s-13
No change in governing statutes, including the Citizenship Act, is necessary to change processing fees for grant citizenship.
I very recently posted these details, with additional commentary, in another topic about this same subject. See link in partial quote below for that discussion:
Note that one of the multiple increases in fees implemented during the Harper era was done with NO notice. Applications already mailed but not yet received were returned for insufficient fees.