Now look at the two rate bands again, and notice that metal appears in both.
Steel and aluminum products are at 50 per cent. Certain steel and aluminum derivative products are at 25 per cent. That is the government's own wording, and Buckland Customs reproduces the same split in its guidance to importers. The word "certain" is doing real work there, and it is not decorative.
The practical consequence is one that no category summary can express. Two metal line items on the same renovation quote — a run of structural steel and a set of fabricated metal fittings, say — can attract different surtax rates depending on where each falls in Canada's tariff schedule. Neither the homeowner nor, in many cases, the contractor can tell which is which by looking at the material. The distinction lives in the classification, not in the metal. A quote that says "steel: subject to tariff increase" is telling you almost nothing, because it has not told you which of the two rates applies, and the difference between them is twenty-five points on the imported portion of that line.
This is the point at which the useful question changes shape. "Is this affected by the tariffs?" is nearly unanswerable. "What tariff item does this classify under, and what rate does the published list assign it?" is answerable — by a supplier, in writing, this week.
