Marketplace Facilitator Laws by State: 2026 Complete Guide

What Is a Marketplace Facilitator?

A marketplace facilitator is a business that contracts with third-party sellers to list their products, facilitates the sale (including payment processing, listing, advertising, or fulfillment), and receives compensation for doing so. The defining characteristic is that the platform sits between the buyer and the seller and controls the transaction infrastructure.

Under marketplace facilitator laws, these platforms are deemed the "seller of record" for sales tax purposes on transactions that flow through them — even though the actual product belongs to a third-party merchant. The platform collects sales tax from the buyer at checkout and remits it directly to state tax authorities.

Classic examples include Amazon Marketplace, eBay, Etsy, Walmart Marketplace, Target Plus, Wayfair, Poshmark, and Reverb. The threshold for "facilitating" varies slightly by state, but the core concept — platform collects, platform remits — is consistent across all enacted laws.

Why Marketplace Facilitator Laws Exist

The 2018 Supreme Court decision in South Dakota v. Wayfair, Inc. allowed states to require remote sellers to collect sales tax based on economic nexus alone — no physical presence required. But Wayfair created an immediate enforcement problem: states now had the legal right to tax millions of small marketplace sellers, but no practical way to identify and collect from them individually.

The solution was marketplace facilitator legislation. Rather than chasing thousands of small third-party sellers, states shifted the collection obligation to the platforms themselves. Amazon has far more administrative capacity to handle sales tax compliance than a sole proprietor selling handmade goods on Etsy. The law recognized that reality.

Washington State enacted the first comprehensive marketplace facilitator law in January 2018, just before the Wayfair decision. By 2021, all 45 states with a statewide sales tax had enacted similar legislation. The last holdout, Kansas, enacted its marketplace facilitator law effective July 1, 2021.

State-by-State Marketplace Facilitator Law Chart (2026)

Every state with a statewide sales tax has a marketplace facilitator law in effect as of 2026. The chart below shows the effective date, the economic nexus threshold that applies to marketplaces, and whether marketplace-facilitated sales count toward the individual seller's direct nexus threshold.

* Hawaii includes marketplace-facilitated sales in the seller's own threshold calculation. Verify current rules with the Hawaii Department of Taxation before assuming exclusion.

How Marketplace Sales Interact with Your Economic Nexus Threshold

This is the question that trips up most multi-channel sellers: if Amazon collects sales tax on your marketplace sales, do those sales count toward your own economic nexus threshold in that state?

In almost every state: no. When a marketplace facilitator assumes the collection obligation, the tax law in most states explicitly excludes those marketplace- facilitated sales from the individual seller's threshold calculation. The rationale is clean: if the marketplace is handling tax compliance on those transactions, the seller has no additional obligation for them — and shouldn't be penalized by counting them.

The practical implication: a seller with $400,000 in Amazon sales into Pennsylvania and $80,000 in direct DTC sales into Pennsylvania has economic nexus triggered only on the $80,000 — because the Amazon sales are excluded. Pennsylvania's threshold is $100,000 in direct sales, so this seller would not have economic nexus and would not need to register for a Pennsylvania sales tax permit — as long as Amazon handles all the tax on those marketplace transactions.

When You Might Still Need to Register Independently

Even with a marketplace facilitator handling your Amazon sales, you may need your own sales tax registration if any of the following apply:

• Direct sales exceed the threshold. Your own website, wholesale orders, trade show sales, or other direct channels into that state push your direct-channel sales past the economic nexus threshold.
• Physical presence. You have employees, inventory (including FBA inventory in Amazon warehouses in that state), or a registered office — physical nexus rules apply regardless of marketplace facilitator status.
• Multiple marketplaces, one not yet covered. You sell on both Amazon (which collects) and a smaller niche marketplace that has not yet established marketplace facilitator status in certain states. Your direct sales plus that second-tier marketplace could push you over threshold.

For a state-specific threshold analysis on Pennsylvania — one of the states with the clearest rules — see our Pennsylvania sales tax nexus hub and the dedicated Pennsylvania nexus checklist.

Seller Responsibilities vs. Marketplace Responsibilities

Marketplace facilitator laws clearly divide the compliance burden. Here is what falls to each party:

Liability shift detail: Most state statutes explicitly transfer collection liability to the marketplace facilitator once the law is in effect. If Amazon collects the wrong tax rate on a transaction, the enforcement action goes to Amazon — not to the third- party seller. The seller's protection is conditional on providing accurate product information; providing a misleading product description that causes a misclassification can revert liability to the seller.

Amazon, eBay, Etsy, Walmart: What Each Platform Covers

Amazon FBA inventory note: Having inventory in Amazon fulfillment centers creates physical nexus in those states — separate from and in addition to marketplace facilitator rules. Even though Amazon collects on marketplace sales, you may still have physical nexus obligations in Amazon warehouse states if you have direct sales channels. FBA warehouse states include California, Texas, Illinois, Pennsylvania, New Jersey, and others. See the full nexus threshold chart for threshold details by state.

Mixed-Channel Sellers: Direct + Marketplace Sales

Most growing e-commerce businesses are mixed-channel: they sell on Amazon (marketplace) and through their own DTC website (direct). Marketplace facilitator laws handle the Amazon side. Your own website is entirely your responsibility.

Step-by-Step Nexus Analysis for Mixed-Channel Sellers

1. Identify your marketplace sales by state. Most marketplace dashboards (Amazon Seller Central, eBay Seller Hub) provide sales reports by ship-to state. Pull the last 12 months.
2. Identify your direct sales by state. From your Shopify, WooCommerce, or other DTC platform.
3. Sum only your direct sales for nexus threshold purposes (not the marketplace sales, unless you're in Hawaii or another exception state).
4. Check for physical nexus separately. Do you have employees, offices, or Amazon FBA inventory in any state? Physical nexus exists regardless of sales amounts.
5. Register in states where direct sales exceed the threshold or where you have physical nexus.
6. Do not register solely because marketplace sales are large. Those are covered. Registering unnecessarily creates ongoing filing obligations.