Even though Amazon collects and remits sales tax for your marketplace sales, you’re not completely off the hook. Sellers still need to register for sales tax permits in any state where they have nexus, file $0 returns in their home state, and keep proper records in case of an audit. And if you sell on other platforms, like Shopify, eBay, or your own site,  you’re responsible for collecting and remitting tax on those sales yourself.