Back over the 2024 holiday season, the federal government ran a temporary GST/HST break that ran from December 14, 2024 to February 15, 2025. It is long over now, but it left Amazon.ca sellers with a lesson worth keeping, because the next time Ottawa does something like this, the scramble will look exactly the same.
The thing the holiday exposed
When the break landed, the tax treatment of a lot of products had to change overnight: children's toys and games, puzzles, video game consoles, certain books and audiobooks, Christmas trees, and a long list of kids' items. Amazon updated some categories automatically. But plenty of products needed a brand new tax code applied by hand, and here is the part that caught people out: those codes live at the SKU level, and assigning them is the seller's job, not Amazon's.
Sellers who assumed Amazon would "just handle it" either kept charging tax that should have been zero, or had to comb their catalog one SKU at a time, including fiddly details like whether a toy contained a battery. With a handful of listings, doing it manually was fine. Past twenty or thirty SKUs, a bulk upload was the only sane way through.
The evergreen takeaway
Your Amazon tax codes are yours to own. They sit at the SKU level, they decide whether tax gets charged and who collects it, and they do not fix themselves when the rules move. The same discipline that mattered during the holiday matters all the time: when you add a product, set its tax code deliberately, and when a tax rule changes, assume you have catalog work to do rather than waiting for the marketplace to do it for you.
If another tax holiday or category change comes along, the playbook is the same. Find out exactly which of your products are affected, check whether Amazon is updating the code automatically or expecting you to, and use a bulk flat-file upload the moment you are dealing with more than a few SKUs.
We documented the specific codes Amazon generated for that holiday and the bulk-update cheat sheet on our firm's site, which is a useful reference for how these changes work in practice: How to Update Amazon.ca Sales Tax Codes for Canadian Tax Holiday.
When Amazon or CRA changes something mid-stream, we translate it into "here is what to actually click" for sellers. That is the kind of thing that goes out in the newsletter.