Do Marketplace Facilitator Laws Cover All My Online Sales?

Key Takeaways

• Marketplace facilitator laws often shift sales tax collection to the marketplace (like Amazon or Etsy), but they usually do not cover sales you make on your own website.
• Even when a marketplace collects tax, you may still have state filing obligations (including “zero returns”) once you’re registered with a state agency.
• Economic nexus thresholds are commonly $100,000 in sales or 200 transactions in a state, though many states have moved to a $100,000-only model.
• Inventory stored in another state (such as marketplace fulfillment warehouses) can create physical nexus and additional registration requirements.

Marketplace facilitator rules can simplify tax collection on third-party platforms, but they do not automatically “cover” every online sale you make. The details depend on where you sell, where your customers are, and whether you also sell through your own channels.

Do marketplace facilitator laws cover all my online sales?

No. Marketplace facilitator laws generally cover sales made through the marketplace when the marketplace is defined by the state as the “facilitator” responsible for collecting and remitting sales tax. These laws typically do not cover:

• Your own website sales (Shopify, WooCommerce, custom site) where you are the seller collecting payment directly.
• Invoice/manual sales where you bill the customer directly outside the marketplace checkout.
• Some B2B or exempt sales where exemption documentation is required and rules vary by state.

Definition-style note: A “marketplace facilitator” is commonly defined as the business that lists, collects payment, and processes/fulfills orders for third-party sellers; states assign tax collection to the facilitator for those marketplace transactions.

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What sales are covered vs. not covered (marketplace, website, social, wholesale)?

Covered: Sales processed through the marketplace checkout

Sales are typically “covered” when the customer checks out on the platform and the marketplace controls the payment flow. In many states, the marketplace must collect and remit sales tax once it exceeds the state’s facilitator threshold (commonly aligned with economic nexus such as $100,000 in sales in the state, though thresholds vary).

Usually not covered: Your direct sales channels

• Your website: If you accept payments directly, you are usually the retailer responsible for tax collection if you have nexus.
• Social selling: If customers pay you directly (DM invoice, manual card entry), marketplace facilitator rules generally don’t apply.
• Phone/email orders: These are typically your direct remote sales, not marketplace sales.

Wholesale sales and resale

Wholesale transactions generally rely on resale/exemption certificates. The form name varies by state, but states commonly require you to keep the certificate on file and may require you to validate the buyer’s sales tax registration number.

Do I still need a sales tax permit and returns if the marketplace collects the tax?

Often, yes—especially if you make any direct sales into a state or have physical nexus. Many first-time sellers are surprised to learn that:

• If you register with a state tax agency (for example, the Massachusetts Department of Revenue), you may be assigned a filing frequency and may need to file returns even in periods with no tax due.
• Marketplace-collected tax may be reported differently than your direct sales (some states treat marketplace sales as “deductions,” “exempt,” or “marketplace” lines on the return).
• If you also sell on your own site, you may need to collect tax once you exceed an economic nexus threshold such as $100,000 in annual sales into that state (a common benchmark).

For sellers expanding into Massachusetts, you may also want to review the registration steps on the Massachusetts sales tax number page so you understand how state-level registration ties into your filing duties.

How marketplace facilitator laws interact with economic nexus

Economic nexus basics for first-time online sellers

Economic nexus means a state can require out-of-state sellers to register and collect sales tax based on sales activity into the state (even with no physical presence). A common threshold structure is:

• $100,000 in sales into the state during the prior or current year, or
• 200 transactions into the state during the prior or current year

Many states have eliminated the 200-transaction test and use a $100,000-only standard. Always evaluate thresholds separately for (1) your direct sales and (2) marketplace sales, because state rules can treat them differently.

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Do marketplace sales count toward your threshold?

In many states, marketplace sales still count toward the state’s threshold for determining whether you have nexus, even if the marketplace collects the tax. That means a high-volume marketplace seller can cross $100,000 quickly and become registered—then later owes collection on direct sales in that state.

Common situations that create tax obligations beyond the marketplace

Inventory stored in another state (marketplace fulfillment warehouses)

If your inventory is stored in a state (for example, in a marketplace-run warehouse), that physical presence can create nexus even if your own website sales are small. States may treat inventory as physical nexus on day one—there is no “$100,000 grace period” when physical nexus applies.

Returns and allowances, refunds, and chargebacks

Returns can change taxable sales totals. Some states require that returns be reported in the filing period when the refund is issued, not when the original sale occurred. Keep marketplace settlement reports because states can request documentation during an audit period that may extend 3 to 4 years depending on the state.

Local tax complexity in home-rule states

Some states have local tax rules that complicate direct sales tax collection. Even if a marketplace handles local tax calculations, your direct sales may require accurate sourcing and rate assignment based on destination, especially where local jurisdictions impose additional rates.

At-a-glance: What’s usually covered by marketplace collection?

Process checklist: How to stay compliant when you sell on marketplaces and your own site

Step 1: Separate marketplace sales from direct sales

Pull monthly totals from your marketplace settlement statements and your website payments processor. Your direct-sales totals determine whether you must start collecting on your site once you exceed a threshold like $100,000 into a state (where applicable).

Step 2: Identify where you have nexus

• Physical nexus: inventory in-state, employees/contractors, offices, or frequent in-state deliveries.
• Economic nexus: remote sales thresholds such as $100,000 and/or 200 transactions.

Step 3: Register before you begin collecting (where required)

States generally expect you to register first, then collect tax. For example, Massachusetts registration and filing are handled through the Massachusetts Department of Revenue, and sellers typically need an active account before reporting sales tax activity.

Step 4: File returns on time—even if the marketplace collected

Once registered, states often assign a filing frequency (monthly, quarterly, or annual). Missing a due date can trigger penalties even if the amount due is $0, so calendar your filing deadlines immediately after registration.

Step 5: Keep documentation

Keep exemption certificates, marketplace settlement reports, and shipping records. A practical retention target many businesses use is 4 years of records so you can support deductions and marketplace-collected sales reporting.

CTA: Apply before you expand to new states

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FAQ: Marketplace facilitator laws for first-time online sellers

1) I sell on Amazon and Etsy—do I ever charge sales tax myself?

Yes, for your direct sales where you have nexus. If you also sell on your own site and exceed a common economic nexus threshold like $100,000 in a state, you may need to register with that state’s tax agency