E-Commerce Marketplace Facilitator Rules: Who Actually Remits The Tax

Canada's GST/HST rules for digital platforms and marketplaces were built to solve a specific problem: a huge volume of small transactions, often from non-resident vendors, that would otherwise go entirely untaxed. The rules that resulted, however, split the remittance obligation in ways that catch sellers off guard when they assume the platform is handling everything.

What A "Marketplace Facilitator" Actually Is

A marketplace facilitator, under the relevant GST/HST rules, is generally a digital platform that controls key elements of a transaction, payment processing, listing, or order fulfillment, for third-party sellers. Major platforms like Amazon, Etsy, and similar marketplaces typically fall within this definition for at least some categories of sales made through them.

When The Platform Remits On Your Behalf

The rules were originally designed around non-resident or non-registered vendors selling to Canadian consumers through a platform, specifically to capture tax on sales that would otherwise slip through entirely. In these cases, the platform itself is generally required to register, collect, and remit GST/HST on the sale, without the underlying vendor needing to separately register for that specific purpose.

When The Obligation Stays With You

A Canadian business that is already registered for GST/HST, because it exceeds the $30,000 small supplier threshold or has voluntarily registered, generally continues to be responsible for its own GST/HST collection and remittance on marketplace sales, even though the platform facilitated the transaction. This is the exact point where sellers most commonly assume the platform "handles everything" and stop tracking their own remittance obligation, a genuinely risky assumption to make without confirming it against the platform's own documentation.

The Registration Question

Whether a specific seller's obligation sits with them or with the platform depends on registration status, sale destination, and sometimes the specific platform's own policies, which can differ from one marketplace to another. Confirming, in writing from the platform itself, exactly which transactions it remits GST/HST on and which it does not is worth doing directly rather than assuming consistency across platforms or over time as rules evolve.

Reconciling Your Own Books Against Platform Reporting

Regardless of who remits, a seller's own bookkeeping needs to correctly reflect gross sales, any tax collected by the platform on the seller's behalf, and any tax the seller itself is responsible for remitting. Many sellers discover a mismatch only when preparing an annual GST/HST return, at which point untangling a year's worth of platform reporting against internal books is considerably more work than reconciling monthly as sales occur.