What Marketplace Facilitator Laws Mean for Multi-Channel Sellers
Sam's List Editorial | 2026-06-23
What Marketplace Facilitator Laws Mean for Multi-Channel Sellers Amazon already collects sales tax on your orders. So you're done, right? That's the assumption that lands sellers in front of an audit letter three years later. Marketplace facilitator laws explained in one sentence: the platform collects and remits the tax, but the platform is not you, and a few states still want to hear from you directly. Here's what that actually means when you sell across more than one channel. Marketplace facilitator laws, explained: what they actually do After the Supreme Court decided South Dakota v. Wayfair in June 2018, states stopped needing a seller's physical presence to require sales tax. They just needed economic activity — a dollar or transaction threshold. That created a mess: thousands of small sellers suddenly owed tax in dozens of states. States solved their own collection problem by pushing the work upstream. Marketplace facilitator laws make the platform — Amazon, Walmart, eBay, Etsy, TikTok Shop — responsible for calculating, collecting, and remitting sales tax on the sales it facilitates. Every U.S. state that has a sales tax now has a marketplace facilitator law on the books. That's all 45 sales-tax states plus Washington, D.C. So for the orders that flow through a big marketplace, the tax is genuinely handled. The catch is in the word "facilitated." It covers sales on the platform . It does not cover everything else you do. Why "Amazon handles it" is only half true The facilitator collects on its own transactions. Your obligations as the seller of record don't fully disappear — they shift. In a lot of states, you still have to register for a sales tax permit if you've crossed economic nexus there, even when 100% of your sales in that state run through Amazon. And many of those states still expect a return. That return is often a zero return or an informational filing: you report your gross marketplace sales, then deduct them as "tax collected by a marketplace facilitator," and the bottom line shows $0 owed. The tax is paid. The state still wants the paperwork that proves the facilitator paid it. Here's the pattern that bites people: the rule varies by state. Some states explicitly excuse a marketplace-only seller from registering. Others don't. Treating all 50 the same — in either direction — is how you end up either over-registered or exposed. Where multi-channel sales tax gets genuinely tricky Now add a second channel. This is where most sellers actually live. Say you sell the same product on Amazon and through your own Shopify store. Amazon's...
