Marketplace Facilitator Laws: Why Marketplaces Now Collect Sales Tax for You (and Where You Still Owe It)

What changed

Following the Wayfair decision and subsequent state legislation, nearly every US state with a sales tax now has a "marketplace facilitator" law requiring the marketplace itself (Amazon, Walmart, eBay, Etsy, etc.) — not the individual seller — to calculate, collect, and remit sales tax on sales made through that marketplace. This is why most marketplace sellers today see sales tax automatically collected and handled without needing to manage it themselves for marketplace-channel sales.

The logic behind these laws was practical: states realized it was far more efficient to require a handful of large marketplaces to handle tax collection across thousands of small sellers than to chase individual sellers for compliance. For sellers, the effect was a dramatic simplification of what had briefly been a very confusing period (roughly the couple of years between Wayfair and full marketplace facilitator adoption) where economic nexus existed but collection mechanics hadn't caught up yet.

How it actually works mechanically

When a buyer checks out on a marketplace, the marketplace's system calculates the applicable sales tax based on the buyer's ship-to address and the product's taxability, adds it to the order total, collects it as part of the payment, and remits it to the relevant state on a schedule the marketplace manages — you never see that tax dollar amount pass through your seller account as revenue you need to send anywhere. On your marketplace sales reports, tax collected and remitted this way is typically broken out as a separate line so it's visible but clearly not part of your payout.

Where sellers still have direct obligations

Direct sales through your own website are generally not covered by marketplace facilitator laws — if you also sell via your own Shopify/DTC site, you're responsible for determining your own nexus and collecting/remitting tax on those sales yourself. Some states have exceptions or additional filing requirements even for marketplace-facilitated sales — a small number of states still require a seller to file a return reporting marketplace sales even though the marketplace remitted the tax, so "the marketplace already handles it" isn't a universal reason to skip registration entirely in every state.

There are a few other situations where facilitator laws don't fully cover you:

• Products the marketplace doesn't classify correctly. If a product is misclassified for tax purposes on the marketplace's system, the marketplace's collection can be wrong, but the underlying tax liability is generally still yours if it's ever questioned.
• Non-marketplace payment methods or off-platform transactions that a marketplace facilitator law doesn't reach (for example, arranging a sale through a marketplace's messaging but completing payment elsewhere — which is also typically against the marketplace's terms of service for other reasons).
• Local or special district taxes in a handful of jurisdictions that operate somewhat separately from state-level sales tax and aren't always cleanly covered by facilitator remittance.

Why this doesn't eliminate all sales tax complexity

Multichannel sellers (marketplace plus their own site) end up managing two different tax realities simultaneously — facilitator-collected tax on marketplace channels and self-managed tax on direct sales — which is one of the more common sources of confusion and, if handled incorrectly, compliance risk for growing multichannel sellers.

A worked (illustrative) example

Imagine a seller running the same catalog on a marketplace and on their own Shopify store. On the marketplace, tax is calculated and collected automatically at checkout and never appears as seller-controlled money — the seller's job is simply to make sure their tax settings/product tax codes on the marketplace are configured correctly. On the Shopify store, the seller (or their sales-tax-automation app) has to determine which states they have nexus in, configure Shopify's tax settings for those states, actually collect the tax from direct-site customers, and file returns with each state on that state's schedule. If the seller assumes "tax is handled" and never sets up direct-site tax collection at all, they'll have under-collected on every direct sale into every state where they have nexus, with the shortfall coming out of their own margin if a state ever assesses it retroactively.

Best practices

• Confirm your product tax codes/categories are correctly configured on each marketplace — miscategorized products can result in wrong tax calculation even under a facilitator law, and disputes about who's responsible for the shortfall can get complicated.
• Set up sales tax collection on your direct-sales channel separately — don't assume facilitator coverage extends to your own site.
• Check whether your nexus states require an informational filing even for facilitator-collected sales, and don't skip registration purely because a marketplace is collecting.
• Revisit this annually, since which states carve out exceptions and which don't can change as legislation evolves.

Common mistakes

• Assuming marketplace facilitator collection means you never need to register for a sales tax permit in any state.
• Forgetting to configure tax collection on a direct-sales website because "the marketplace already does this."
• Not checking whether a state requires an informational return on top of facilitator remittance.
• Leaving product tax codes at a generic default when a more specific, accurate category would calculate tax correctly.

FAQs

Do I need to do anything at all for sales tax if I only sell through marketplaces? In most states, no — the facilitator handles collection and remittance. But a small number of states still expect a registration or informational filing, so it's worth confirming with a tax professional rather than assuming zero obligation everywhere.

What happens if a marketplace miscalculates tax on my listing? The marketplace's collection can be wrong if a product is miscategorized, but the underlying liability generally still traces back to the seller if it's later questioned by a state — which is why correct product tax coding matters even when you're not the one remitting.

Does a facilitator law cover sales tax on shipping charges too? Whether shipping is taxable at all, and whether facilitator collection extends to it, varies by state and by how the charge is presented — this is one more reason not to assume uniform coverage across every state.