Provisions of the Canada Election Act provide direct legal authority to draw from the consolidated revenue fund of Canada to ensure the holding and preparation of an election.
Budget cycles lead to budget legislation, which provides annual appropriations. However, certain agencies—not very many—sometimes benefit from a permanent authority under the law, such as employment insurance. So Parliament voted on it once and could amend it. In our case, we are talking about a very useful authority for the reasons you mentioned.
We make adjustments based on expenditures and events that occur.