Marketplace Facilitator Vs Third-Party Seller: Who Collects And Remits Sales Tax?

Marketplace Facilitator An online marketplace that meets statutory criteria requiring it to collect and remit sales tax on specified third-party seller transactions. The practical question for sellers and platforms is which party — the marketplace or the individual seller — has the legal obligation to collect tax in each jurisdiction.

Responsibility for sales tax collection used to default to the seller; after Wayfair and subsequent state laws, many states now name the marketplace as the responsible party when the platform facilitates a sale. The result is an operational and legal hand-off in many transactions, but the transfer of responsibility is not uniform across states and does not always absolve the seller of all obligations.

How States Assign Responsibility

States typically assign responsibility using statutory language that identifies a "marketplace facilitator" and lists the facilitator’s duties. The language can specify whether the facilitator is required to collect and remit sales tax on all transactions processed through its platform, or only on transactions where the facilitator provides certain services, like payment processing, fulfillment, or checkout. Some states provide safe-harbor thresholds tied to gross sales or transaction counts.

Seller Liability Versus Marketplace Liability

Even when a marketplace collects and remits tax, sellers should understand three possible legal outcomes under state laws:

• Sole Marketplace Liability: The statute makes the marketplace solely responsible for collection and remittance for covered transactions.
• Joint Or Several Liability: Both marketplace and seller can be liable, typically to ensure state enforcement against any collectible party.
• Seller Recordkeeping: The seller must maintain records or perform reporting even if not responsible for collection.

Practical Examples

Example A — Marketplace Collects: A seller lists electronics on a large marketplace. The marketplace meets a state's threshold and collects sales tax at checkout. The seller does not need to file sales tax returns for those marketplace-processed sales in that state, but must keep records and may need to report marketplace sales on its own returns if the state requires consolidated reporting.

Example B — Seller Still Has Obligations: The same seller also sells through its own website. Those off-platform sales may still require the seller to register and remit tax in buyer states if thresholds are met. The marketplace's collection does not affect the seller's obligations for non-marketplace channels.

Operational Steps For Marketplaces

Marketplaces should:

• Register Where Required: Complete state registrations in jurisdictions where thresholds are exceeded.
• Collect Correctly: Implement product taxability rules, nexus sourcing, and exemption handling.
• Provide Seller Statements: Deliver detailed tax collection reports so sellers can reconcile their records and demonstrate that tax was collected on transactions.

Operational Steps For Sellers

Sellers using marketplaces should:

• Review Marketplace Policies: Confirm which transactions the marketplace will collect for and whether the marketplace’s collection relieves the seller’s registration requirements.
• Document Receipts: Keep copies of marketplace collection notices and transaction-level data to support filings and audits.
• Monitor Non-Marketplace Channels: Track off-platform sales that may still create nexus and registration obligations.

Audit And Dispute Considerations

In audits, states may examine whether sales should have been treated as marketplace-facilitated. Marketplaces should be prepared to provide transaction-level records showing that tax was collected and remitted. Sellers should keep documentation proving which sales were processed through the marketplace and any communications with the marketplace about tax collection.

Negotiating Risk Allocation

Contracts between marketplaces and sellers can clarify responsibilities. Marketplaces often include clauses that state they will collect and remit taxes where required; sellers should seek clear statements about what the marketplace will do and whether the seller retains any residual liabilities or reporting duties.

In short, a Marketplace Facilitator designation typically assigns collection and remittance duties to the platform for covered transactions, but the legal and operational responsibilities for sellers and marketplaces vary by state. Both parties must review state statutes, marketplace policies, and contractual terms to determine who actually collects, remits, and retains records for each sale.