Marketplace Facilitator Laws (2026): Who Actually Collects Your Sales Tax

A candle maker sells about $340,000 a year, almost all of it through Etsy and Amazon, with maybe $15,000 through her own site. Etsy and Amazon show tax collected and remitted on every order. She has never registered anywhere, because every article she read said the marketplace handles sales tax now.

Then a letter arrives from a state where she has done roughly $180,000 of Amazon volume. The state's position is straightforward: her gross sales into the state exceeded the threshold, she therefore had economic nexus, she was required to register, and she has three years of unfiled returns. The tax on the Amazon sales was in fact remitted — by Amazon — so the assessment is not for tax. It is for failure to file, at a couple of hundred dollars per missed period, plus interest, plus the $15,000 of direct-channel sales where she genuinely under-collected.

What the law actually transfers

Facilitator statutes are narrower than their reputation. They pick up one specific obligation and leave the rest of the compliance stack exactly where it was. Reading the split explicitly is the fastest way to see where your own exposure sits.

For the shopper-side view of the same rules — why an online order is taxed at all, and why two sites charge different amounts — see online sales tax explained.

The bolded rows are the whole problem. Everything the platform does is visible to you every day — you see the tax line on every order. Everything that remains yours is invisible until a state writes to you.

Why marketplace sales still count toward your threshold

This is the point that produces the most disbelief, and the logic is worth spelling out, because it is not arbitrary. Economic nexus thresholds ask a question about your economic presence in the state — how much business you do there. They do not ask who processed the payment. A seller shipping $250,000 of product to customers in a state has a substantial economic presence there whether the checkout was hosted by Amazon or by their own server.

So in most states the threshold test counts gross sales including facilitated ones. Cross it and you have nexus. Having nexus means registration, and registration means filing — even though the platform will keep on remitting the tax on the marketplace portion and your returns will report little or no tax due.

The zero-return trap

Once you register, a clock starts. The state assigns you a filing frequency and expects a return every period forever, until you formally close the account. It does not matter that the tax was zero. It does not matter that a platform remitted everything. A period with no return is a delinquency.

Penalties for late filing are typically assessed as a flat minimum when no tax is due — often in the $50 to several hundred dollar range per period per state. That is small enough to ignore and large enough to compound viciously. A seller registered in eight states, filing monthly, who stops filing for two years, has 192 missed returns. At $100 each that is $19,200 in penalties on zero dollars of tax.

Where the real money is: your direct channel

For multichannel sellers, marketplace compliance is mostly administrative noise. The genuine tax exposure lives on the channel nobody is helping with — your own storefront.

The pattern is consistent. A seller who does 90% marketplace and 10% direct has become accustomed to tax appearing automatically, so the direct store is configured casually or not at all. But the direct channel has no facilitator behind it: you owe correct rates by destination, correct treatment of the shipping line, correct product taxability, and correct exemption certificates on every wholesale order. And crucially, the nexus that your marketplace volume created is what obliges you to collect on those direct sales in the first place.

That is the sting in the tail: the marketplace does not just fail to protect your direct sales — its volume is often the very thing that makes those direct sales taxable.

Inventory: the obligation that predates all of this

Facilitator laws addressed collection. They did nothing about physical presence. If you use FBA or a third-party fulfilment network, your goods are being moved between warehouses in states you have never heard of, and storing inventory in a state has historically been treated as creating physical nexus in most states.

Physical nexus does not care about thresholds — a single pallet can create it. And its consequences reach past sales tax into state income or franchise tax filing obligations that no marketplace remits on your behalf. Pull your inventory placement report from the platform and treat every state on it as a question to answer, not a footnote. The FBA inventory issue is covered in more detail in the economic nexus guide.

A practical compliance posture

1. Pull channel-split revenue by state. Marketplace versus direct, gross sales and transaction counts, for the last three years. Nearly every platform exports this; almost nobody looks at it.
2. Test thresholds on gross including marketplace. This gives you the conservative list of states where you likely have nexus.
3. Overlay your inventory locations. Add every state where stock has been stored, regardless of sales volume.
4. Fix the direct channel first. That is where uncollected tax accumulates. Correct rates, shipping treatment, and product taxability there before anything else.
5. Register deliberately, then file relentlessly. Every registration is a recurring obligation. Take on the ones you owe and calendar them properly.
6. If you are already years behind, look at voluntary disclosure. States generally offer a limited lookback and penalty waiver to sellers who come forward before being contacted — an option that disappears the moment their letter arrives.

Related tools

• Economic nexus calculator — test gross sales and transaction counts against each state's threshold.
• Multi-state sales tax calculator — model liability across every state you sell into.
• Sales tax reconciliation calculator — reconcile platform-remitted tax against what your books say.
• Sales tax by state — 2026 combined rates for every jurisdiction.