AWS Marketplace setting up my Tax account

To register your SaaS solution in AWS Marketplace, you'll need to provide tax information that matches your business location.

If you're registering as a seller with paid products, you'll need to provide tax information based on where your business is officially registered. For US-based entities, you'll need to provide a W-9 form and a US-based bank account. For non-US entities (like your Canadian business), you'd need to provide a W-8 form, VAT/GST registration number, and a bank account with a SWIFT code in an eligible jurisdiction.

The critical point is that your tax interview location must match your business location in the AWS Marketplace Management Portal. If these locations don't match, you'll encounter errors during the registration process.

If you have businesses in both Canada and the US, you should choose which business entity will be the seller in AWS Marketplace and provide the corresponding tax information. The tax information you provide should be consistent with the business entity you're registering with.

You can also add supplemental tax registration information if needed. After your primary registration is complete, you can add supplemental Tax Registration Numbers (TRNs) by signing into the AWS Marketplace Management Portal, going to Settings, selecting the Tax settings tab, and choosing "Add supplemental tax information."
Sources
Supplemental tax registrations - AWS Marketplace
Troubleshooting - AWS Marketplace
Getting started as an AWS Marketplace seller - AWS Marketplace