Marketplace Facilitator Nexus and Sales Tax: What Sellers Need to Know in 2026

Marketplace facilitator laws require online platforms — not individual sellers — to collect and remit sales tax on transactions made through their marketplaces. Before these laws existed, the burden of sales tax collection fell entirely on the seller, even if the sale happened through a third-party platform like Amazon or eBay.

The concept gained momentum after the 2018 South Dakota v. Wayfair Supreme Court decision, which allowed states to require sales tax collection from remote sellers based on economic activity rather than physical presence. States quickly realized that the most efficient way to capture tax revenue from thousands of small sellers was to place the collection obligation on the platforms facilitating those sales.

A marketplace facilitator is generally defined as an entity that contracts with third-party sellers to promote their products, facilitates the payment process, and either directly or indirectly handles fulfillment. Under these laws, the facilitator steps into the shoes of the seller for sales tax purposes, becoming responsible for collecting, reporting, and remitting the tax to the appropriate state.

As of 2026, all 45 states that impose a sales tax plus the District of Columbia have enacted marketplace facilitator laws. The five states without a general sales tax — Alaska, Delaware, Montana, New Hampshire, and Oregon — do not have these laws at the state level, though some Alaska localities have adopted marketplace facilitator provisions under their local sales tax ordinances.

Most states adopted their marketplace facilitator laws between 2019 and 2021. The thresholds that trigger a platform's obligation to collect tax vary by state, but they generally mirror the economic nexus thresholds established after Wayfair. The most common threshold is $100,000 in sales or 200 transactions in a state during the current or prior calendar year, though many states have dropped the transaction count test and rely solely on a dollar amount.

States like California set a higher threshold at $500,000 in sales, while others like Pennsylvania and Washington use the standard $100,000 benchmark. New York applies a $500,000 threshold combined with more than 100 transactions. Sellers should be aware that these thresholds apply to the marketplace facilitator's aggregate sales in the state, not to any individual seller's volume. Once the platform crosses the threshold, it must collect tax on all facilitated sales in that state regardless of individual seller activity levels.

Each major marketplace handles sales tax collection differently, and understanding the nuances matters for accurate compliance.

Amazon collects and remits sales tax on behalf of third-party sellers in all states with marketplace facilitator laws. This applies to sales made through the Amazon.com marketplace, including FBA (Fulfillment by Amazon) and FBM (Fulfilled by Merchant) orders. Amazon also handles sales tax for Kindle, Alexa skills, and other digital products. Sellers can view tax collection reports through Amazon Seller Central, but Amazon does not file seller-level returns — it files in its own capacity as the facilitator.

Shopify operates differently because it functions as both a direct storefront builder and a marketplace through Shopify Markets. For sales made through a seller's own Shopify-powered website, the seller is responsible for sales tax collection and remittance. However, for sales facilitated through Shopify's marketplace features, Shopify may act as the marketplace facilitator. Shopify Tax, built into the platform, helps calculate rates, but sellers using standalone Shopify stores need to manage their own compliance.

eBay collects and remits sales tax on all transactions in states with marketplace facilitator laws. This includes fixed-price listings, auction sales, and Buy It Now purchases. eBay provides sellers with tax reporting through their payment summary and 1099-K forms. Like Amazon, eBay files as the facilitator, not on behalf of individual sellers.

Etsy collects and remits sales tax in all applicable states and also handles the collection of applicable state and local taxes on shipping charges where required. Etsy sellers can view tax details on their payment account page, but they do not need to take any action for marketplace-facilitated sales in states where Etsy collects.

The biggest misconception among marketplace sellers is that facilitator laws eliminate all sales tax responsibility. They do not. Here is what sellers must still manage.

First, direct sales outside the marketplace are entirely the seller's responsibility. If you sell through your own website, at trade shows, through social media direct messages, or via wholesale channels, you are the one who must collect, report, and remit sales tax. Many multi-channel sellers overlook this because they assume marketplace collection covers everything.

Second, sellers must still track their own economic nexus exposure. Even if Amazon is collecting tax on your marketplace sales, your total sales into a state — across all channels — count toward that state's economic nexus threshold for your direct sales obligations. If you sell $60,000 through Amazon and $50,000 through your own website in Texas, you have $110,000 in total activity in that state, which exceeds the $500,000 threshold — so for this example Texas is not triggered. But a state with a $100,000 threshold would be a different story.

Third, some states require marketplace sellers to file returns even when the facilitator collects the tax. This is often a zero-dollar return, but failing to file it can result in penalties. States like Oklahoma have specific requirements around this.

Fourth, sellers must manage exemption certificates. When selling to resellers or tax-exempt organizations, the seller often needs to collect and validate exemption certificates, even for marketplace sales. How this works varies by platform and state.

Finally, sellers should reconcile their marketplace tax reports against their own records. Platforms occasionally miscalculate tax rates, apply the wrong product taxability rules, or fail to account for state-specific exemptions. The liability for undercollection can fall back on the seller depending on the state.

Marketplace facilitator laws generally provide sellers with a liability shield — meaning the seller is not held responsible for tax that the marketplace was supposed to collect. However, this protection has limits.

In most states, the liability relief only applies to sales actually facilitated through the marketplace. Any direct sales remain fully the seller's liability. If a state audits your business and finds that you made direct sales without collecting tax, the marketplace facilitator law provides no defense.

Some states have carve-outs or exceptions. For instance, if a seller provides incorrect information to the marketplace — such as wrong product categorization that leads to undertaxation — the seller may be liable for the difference. States including Virginia and Minnesota have provisions that shift liability back to the seller when the seller's data causes the miscollection.

There is also the issue of non-collecting marketplaces. Not every platform qualifies as a marketplace facilitator under every state's definition. Smaller platforms, classified ad-style sites, or platforms that merely provide advertising without facilitating payment may not meet the legal definition. Sellers using these platforms remain fully responsible for their own tax collection.

Additionally, business-to-business transactions present complications. Many marketplace facilitator laws focus on retail sales and may not clearly address B2B sales, drop-shipping arrangements, or wholesale transactions conducted through a platform. In these gray areas, the seller should assume responsibility until guidance says otherwise.

The practical path to compliance for marketplace sellers starts with mapping all your sales channels and understanding which ones are covered by facilitator laws and which are not. From there, you need to determine your independent economic nexus footprint based on your non-marketplace sales.

Register for sales tax permits in every state where you have an obligation from direct sales. Use tax automation software that integrates with your ecommerce platforms to handle rate calculation and collection on non-marketplace channels. Reconcile marketplace tax reports quarterly at a minimum.

If you sell on multiple platforms and through your own website, the compliance picture gets complicated quickly. Working with a tax professional who specializes in multi-state nexus and ecommerce sales tax can save you from costly penalties and audit exposure. Nexus Accountant helps marketplace sellers identify their true nexus footprint, reconcile platform reports, and stay compliant across all channels — not just the ones where the marketplace is collecting for you.