Cross-Border Selling Tax for Canadian E-Commerce Sellers
How tax really works when you sell across the border: zero-rated exports and the GST/HST refund position, US sales tax nexus, customs and import GST, and what happens when your FBA inventory sits in the United States. Written by a licensed Canadian CPA who works with Amazon and Shopify sellers.
When a Canadian e-commerce seller ships to customers outside Canada, those export sales are generally zero-rated for GST/HST: you charge 0% but still claim full input tax credits on your Canadian costs, which often leaves you in a refund position. Selling across the border also raises separate issues that Canadian GST/HST does not cover, including US sales tax nexus, customs duty and import GST when goods cross, and the tax consequences of storing FBA inventory in the United States. Each one is governed by its own rules, so cross-border sellers need their books built to keep them apart.
The Four Cross-Border Tax Issues Every Canadian Seller Faces
Selling beyond Canada does not just add more sales; it adds whole new tax systems on top of your Canadian filings. A seller who treats a US sale the same as an Ontario sale will get the GST/HST wrong and may miss obligations on the other side of the border entirely. These are the four issues that come up again and again.
- Zero-rated exports. Sales shipped to customers outside Canada are generally zero-rated. You charge 0% GST/HST but still recover input tax credits on your Canadian expenses.
- US sales tax nexus. Selling into US states can create a sales tax obligation there under each state's own economic nexus rules, which are completely separate from Canadian GST/HST.
- Customs and import GST. When goods physically cross the border, customs duty and import GST can apply, and the importer of record matters for who pays and who can recover it.
- FBA inventory in the US. Storing inventory in US fulfilment centres changes where your stock sits for tax purposes and can affect both US obligations and your Canadian reporting.
1. Zero-Rated Exports and the Refund Position
This is the rule that works in a cross-border seller's favour. When you sell to customers outside Canada, those sales are generally zero-rated: you charge 0% GST/HST, yet you still claim full input tax credits on the GST/HST you paid on Canadian costs such as advertising, software, professional fees and inventory bought in Canada. The result is that sellers with heavy export volume frequently sit in a net GST/HST refund position every filing period, because they collect little or no tax but recover it on all their Canadian spending. Structuring filings to capture this is a core part of how we handle e-commerce accounting and tax for cross-border sellers.
The key point: Zero-rated is not the same as exempt. A zero-rated sale still lets you claim input tax credits; an exempt sale does not. That distinction is what puts export-heavy sellers in a refund position rather than simply collecting nothing.
2. US Sales Tax Nexus Is a Separate System
US sales tax has nothing to do with Canadian GST/HST. Each US state sets its own rules, and many apply economic nexus: once your sales into that state pass its threshold, you may be required to register, collect and remit that state's sales tax. Storing inventory in a state through FBA can also create a physical presence in that state. Because every state is different and the thresholds vary, US sales tax is assessed state by state rather than answered with a single rule. The important thing for a Canadian seller is to recognize that crossing into US markets can trigger obligations that your Canadian filings will never capture.
Common blind spot: Many Canadian sellers assume that because Amazon may handle some US marketplace tax, they have nothing to think about south of the border. Nexus, registration and inventory location still need to be reviewed for your specific footprint, because the consequences land on you, not the platform.
3. Customs Duty and Import GST When Goods Cross
When physical goods move across the border, customs duty and import GST can apply at the point of importation. Who is named as the importer of record determines who is responsible for those charges and who may be able to recover the import GST as an input tax credit. Getting this wrong, or having goods imported under the wrong party, is a frequent source of unrecovered tax and unexpected cost for sellers moving inventory between Canada and the US.
| Cross-Border Movement | What Can Apply |
|---|---|
| Importing inventory into Canada | Customs duty and import GST at the border |
| Exporting a sale to a customer abroad | Generally zero-rated for GST/HST |
| Shipping your stock into US FBA warehouses | US-side import and inventory considerations |
| Import GST you paid as importer of record | May be recoverable as an input tax credit |
4. FBA Inventory Stored in the United States
When you send stock to US fulfilment centres, your inventory is physically located in the US, which can create or change obligations on the US side while still needing to be reported correctly in your Canadian books. For sellers running Amazon across both countries, the cleanest approach is to track each marketplace and inventory location separately so Canadian zero-rated exports, US sales and import movements never get mixed together. This is exactly the kind of separation we build for cross-border Amazon FBA and Shopify sellers.
How Marketplace-Collected Tax Fits In
Amazon collects and remits GST/HST on many marketplace sales to Canadian buyers, and that tax must never be re-reported on your own return. When you layer cross-border activity on top, the reconciliation becomes more important, not less: your settlement reports need to separate Canadian marketplace-collected tax, your own self-collected Canadian tax, zero-rated exports and US sales, all on the same set of books. Handling that cleanly is central to our Amazon seller accounting and tax services.
A Simple Worked Example
Consider a Canadian seller in a quarter with strong US export volume:
| Item | Amount |
|---|---|
| Export sales shipped to US customers (zero-rated) | 0% GST/HST charged |
| GST/HST collected on Canadian direct sales | $900 |
| ITCs on advertising, software, fees and Canadian costs | $3,200 |
| Net GST/HST result on the return | $2,300 refund |
Because the export sales were zero-rated and the seller still recovered credits on all Canadian spending, the period ends in a refund. The same seller still has to consider US nexus and any import GST separately, but on the Canadian return the cross-border structure works in their favour when it is filed correctly.
Where cross-border selling goes wrong: Charging GST/HST on zero-rated exports, ignoring US state nexus, failing to recover import GST, mixing US and Canadian sales on one revenue line, and double-reporting marketplace-collected tax. Each one distorts the return and each one is avoidable with cross-border-specific accounting.
Case Study: US-Heavy FBA Seller, Ontario
An Ontario seller shipped most of their volume to US customers through FBA but was charging and reporting GST/HST on those export sales as if they were domestic, while never claiming the input tax credits on their ad spend and software. We reclassified the export sales as zero-rated, separated US sales and inventory from the Canadian books, recovered the missed credits across the open periods, and flagged the US nexus questions for a state-by-state review. On the Canadian side the seller moved from overpaying to a properly calculated refund position.
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