More than Tax Compliance: California Legislation Requires Marketplace Facilitators to Track “High-Volume” Seller Information

The responsibilities of marketplace facilitators operating in California are expanding under legislation recently signed by Governor Gavin Newsom. Starting on July 1, 2023, an “online marketplace” will be required to collect and maintain specified contact and financial information related to its “high-volume third-party sellers.” The legislation is intended to “provide greater tools for law enforcement to identify stolen items” being resold through online marketplaces.

Under the legislation, a “high-volume third-party seller” is defined as any seller who, in any continuous 12‑month period during the previous 24 months, has entered into 200 or more transactions through an online marketplace for the sale of consumer products to buyers located in California, resulting in a total of $5,000 or more in gross revenues. While the legislation includes its own definition of an “online marketplace,” the definition will likely reach most (if not all) businesses classified as “marketplace facilitators” for California sales tax purposes.

An online marketplace will be required to collect information about any high-volume third-party seller on its platform, including the seller’s name, tax ID number and bank account number (presuming the seller has a bank account), along with certain government-issued records or tax documents if the seller is not an individual. For those sellers making at least 200 sales totaling at least $20,000 in gross revenues to buyers in California, an online marketplace must collect additional information, disclose certain contact information to consumers and provide a means to allow users “to have direct and unhindered communication with the seller.”

Information collected about sellers must be verified within 10 days and be maintained for at least two years, and the online marketplace must suspend sales activities of a high-volume third-party seller out of compliance with the requirements of the legislation. An online marketplace not in compliance with the legislation will be subject to a penalty of up to $10,000 for each violation.

Businesses impacted by this legislative development or with questions about marketplace facilitators are encouraged to contact the authors of this article.

Charles Moll, III
Charles (Chuck) Moll focuses his practice on state and local tax (SALT), primarily concentrating on the resolution of tax controversies. He regularly appears before the various California tax authorities—including the State Board of Equalization, the California Franchise Tax Board, the California Department of Tax and Fee Administration, and the Office of Tax Appeals—as well as local authorities such as assessors and assessment appeals boards. He has litigated at all levels of California’s courts, the US Tax Court, and the US Supreme Court. Read Charles Moll's full bio.


Michael J. Hilkin
Michael J. Hilkin represents clients in all aspects of complex state and local tax matters. He has a particular focus on tax controversy and transactional issues relating to state and local income, franchise, sales and use, gross receipts and other business taxes. Michael has extensive experience handling state and local tax issues before US administrative and judicial systems. Read Michael Hilkin's full bio.


Elle Kaiser
Elle Kaiser focuses her practice on state and local tax (SALT) matters. She advises clients in various industries, including technology, banking, consumer products, energy, insurance, retail and transportation. Elle is experienced in both tax planning and tax disputes. Read Elle Kaiser's full bio.

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