What is a marketplace facilitator law and does it cover Canadian sellers?

Why states shifted collection onto the marketplace

After US states gained broader authority to tax remote sellers, they quickly found that requiring every individual seller on a large marketplace to register and remit tax separately created an enforcement problem: thousands of small sellers, many outside the US entirely, each with their own compliance burden. Marketplace facilitator laws, adopted by essentially every state that charges sales tax, solve this by making the marketplace operator itself responsible for calculating, collecting, and remitting sales tax on transactions it facilitates, regardless of where the individual seller is located.

This means a state can hold Amazon or Etsy accountable for sales tax on a transaction rather than chasing an individual seller in another country, which is a far more practical enforcement point for the state and, in most cases, a real compliance relief for the seller.

How this applies to a Canadian FBA or Etsy seller

A Canadian seller using Fulfillment by Amazon benefits from this the same way a US-based Amazon seller does: Amazon calculates the applicable state sales tax at checkout, collects it from the buyer, and remits it to the state directly, without the seller needing to register in each state where a sale occurred. The seller’s own income tax position is unaffected by this; it addresses sales tax collection on the transaction only, a distinction covered further in does Amazon collect US sales tax for Canadian FBA sellers.

The same principle applies on Etsy, eBay, and Walmart Marketplace: each of these platforms qualifies as a marketplace facilitator in the states where the law applies and generally handles state sales tax collection on your behalf for sales made through that platform.

Why your own website is not covered

A marketplace facilitator law only applies to sales facilitated by the marketplace, meaning transactions that happen through that platform’s checkout. A Canadian seller running their own Shopify store, selling directly to US customers without going through Amazon, Etsy, or a similar facilitator, is not covered by these laws for those sales at all. Once your direct-to-website sales into a particular state cross that state’s economic nexus threshold, the responsibility to register, collect, and remit sales tax in that state falls on you as the seller, not on any platform, covered in more detail in what is economic nexus for Canadian online sellers.

This creates an important practical split for a seller using both channels: Amazon sales are generally covered automatically, while the same product sold through your own Shopify store to the same US customer base is not, and the two channels need to be tracked separately for sales tax purposes even though they are the same business.

Canada's own version: platform operator rules since July 2021

Canada introduced a parallel structure through its digital economy measures, effective July 2021, which require certain non-resident and platform-based sellers to register for and collect GST/HST on sales to Canadian consumers, shifting some collection responsibility onto qualifying platform operators in a way conceptually similar to a US marketplace facilitator law. The details differ between the two countries, but the underlying idea is the same: put the collection obligation on the platform that has the technical and administrative capacity to apply it consistently, rather than on every individual seller using that platform.

For a Canadian seller using platforms on both sides of the border, this means checking each platform’s own disclosures about what it collects automatically versus what remains the seller’s responsibility, since the answer differs by platform and by which side of the border a given sale falls on.

What a seller still needs to track even when a marketplace collects tax

Automatic collection by a marketplace does not remove the need to reconcile what was collected and remitted against your own sales records, since marketplace tax reports can affect how you record revenue and fees in your books, similar to the reconciliation described in how to record Amazon settlements and fees in QuickBooks. It also does not remove any Canadian income tax or GST/HST obligations on the same income; marketplace facilitator collection addresses US state sales tax specifically and has no bearing on how the profit from those sales is taxed in Canada.

Why a seller's US income tax question is separate again

A marketplace collecting sales tax says nothing about whether a Canadian seller owes US income tax on the profit from those sales. That question turns on whether the seller has a US permanent establishment under the Canada-US tax treaty, an entirely different analysis covered in do Canadian Amazon FBA sellers owe US income tax. A seller can have every dollar of marketplace sales tax handled automatically by Amazon and still need to work through a separate US income tax and filing analysis for the same revenue.

Keeping these three layers distinct, US state sales tax, US income tax, and Canadian income tax and GST/HST, is the most common source of confusion we see in cross-border e-commerce files, since a seller who confirms one layer is handled sometimes assumes the others are automatically covered as well.

How we help sellers sort out what is covered

We map out which of a client’s sales channels are covered by marketplace facilitator collection and which are not, so nothing falls through the gap between an Amazon listing and a direct Shopify sale to the same market. Our US sales tax for Canadian e-commerce page covers economic nexus and marketplace facilitator questions together for cross-border sellers.