Since October 1, 2019, California has generally treated a registered or registration-required marketplace facilitator as the retailer for sales and use tax purposes on retail sales of tangible personal property it facilitates through its marketplace for delivery to California customers. When that rule applies, the marketplace seller is generally not the retailer for those marketplace sales. But that legal rule does not end the audit problem. In a CDTFA audit, the seller still has to prove that the sales at issue were in fact facilitated by a qualifying marketplace facilitator, that the facilitator was registered or required to be registered, and that the seller is not trying to shift liability for its own direct sales onto the platform.
That distinction matters because a marketplace seller can still owe California Department of Tax and Fee Administration (CDTFA) registration duties even though the facilitator collected tax on marketplace sales. If the seller also makes direct sales through its own website or through an unregistered platform, those direct sales can keep the seller in the system. California state also requires a marketplace seller to count both its marketplace sales and direct sales when determining whether it crosses the $500,000 economic-nexus threshold. In other words, many audit disputes are not about whether marketplace facilitator rules exist. They are concerned whether the taxpayer can prove which sales were marketplace sales, which were direct sales, and who actually bore collection responsibility for each category.
In a CDTFA Audit, the Seller Should Be Ready to Prove the Platform’s Responsibility Transaction by Transaction
The strongest audit file starts with contemporaneous documentation, not after-the-fact explanations. California expects marketplace sellers to maintain records showing that the marketplace facilitator was responsible for collecting, reporting, and paying the tax on facilitated sales. The most useful records include a written agreement or other documentation showing that the facilitator was registered with CDTFA as a retailer, the facilitator’s valid seller’s permit number or Certificate of Registration – Use Tax account number, and records that let CDTFA verify that the facilitator actually collected the correct amount of tax or tax reimbursement from the purchaser and paid it to CDTFA. CDTFA expressly states that it will not hold a marketplace seller liable for a facilitated transaction if it can verify that the facilitator collected the correct tax or tax reimbursement and remitted it.
That means the seller should preserve more than a generic marketplace agreement. In practice, the best proof usually includes facilitator settlement reports, transaction-level sales reports, tax-collected fields, payout statements, SKU mappings, dates of sale, shipping destinations, and records separating marketplace sales from direct sales. A registered seller should also make sure its CDTFA returns match that story. California requires registered marketplace sellers to continue reporting total sales on their returns, including facilitated sales, and then claim a deduction as “other” for sales made through a marketplace for which the facilitator is responsible for collecting, reporting, and paying the tax. If the return position, facilitator reports, and internal books do not align, the audit becomes much harder very quickly.
The Most Expensive Audit Mistakes Usually Involve Direct Sales, District Tax, and Drop Shipments
Many sellers lose these audits because they treat all online sales as if a platform collected the tax. California does not do that. A sale made through the seller’s own website is a direct sale, not a marketplace sale, even if the seller also uses major marketplaces for other orders. A sale facilitated by a person that is not a registered marketplace facilitator and is not required to be registered as one also does not receive the same treatment. And when a seller remains registered with CDTFA because it has direct sales, inventory in California, or nexus, the seller still has to keep its direct-sale liability separate from its marketplace-sale deductions. An unsupported “the marketplace handled it” answer usually fails if the seller cannot match the deduction to actual facilitated transactions.
The same problem appears in local and district tax and in drop-shipment chains. California’s marketplace rules do not erase the need to determine who the retailer is in the specific transaction structure under review. Regulation 1706 makes clear that when a marketplace facilitator is the retailer under Revenue and Taxation Code section 6043, the facilitator is not a true retailer for drop-shipment purposes, and the supplier is not the drop shipper liable as retailer on that marketplace sale. But the supplier or seller still has to be able to prove that structure. A timely resale certificate can do that if it contains the required marketplace-seller statement and identifies the marketplace facilitator by name and a valid seller’s permit number or Certificate of Registration account number. Without that proof, the presumption can run the wrong way in an audit.
Marketplace sellers should also remember that California carved out special rules for some businesses that sound platform-like but are not automatically marketplace facilitators. Delivery network companies are not marketplace facilitators unless they elect that treatment, and beginning January 1, 2023, vehicle rental brokers facilitating rentals of passenger vehicles for unrelated rental companies are not treated as marketplace facilitators for those transactions. So a taxpayer cannot safely assume that every app, platform, or broker collected California tax as the responsible retailer. The contract and the statute have to match.
Older Audit Periods Can Raise Special Relief Issues, but Relief is Narrow and Fact Specific
If the audit extends to older periods, the marketplace facilitator relief statutes may apply. Section 6046 can relieve a marketplace facilitator when it made a reasonable effort to obtain accurate and complete information from an unrelated marketplace seller and the undercollection resulted from incorrect or incomplete information supplied by that seller. In that situation, the marketplace seller can become the retailer for that sale. Section 6047 provides a separate relief path for certain pre-2023 facilitated sales involving unrelated parties and good-faith errors, subject to statutory caps by period. But neither provision gives blanket protection, and section 6047 expressly does not relieve anyone who collected tax and then failed to remit it.
That is why sellers should be careful about the story they tell when they receive a CDTFA audit inquiry. Saying the marketplace facilitator was “supposed” to collect the tax is not the same as proving that it did. Saying a seller gave the platform the right product information is not the same as proving that the information was complete and accurate. And saying tax was charged to the customer is not the same as proving that CDTFA received it. In older-period audits, especially, the department may scrutinize agreements, emails, product taxability coding, resale documentation, and registration status closely because those facts determine whether relief belongs with the facilitator, the seller, or neither.
Contact the Tax Law Offices of David W. Klasing if You Need to Prove a Marketplace Facilitator, Not Your Business, Collected the Tax
At the Tax Law Offices of David W. Klasing, we handle California sales tax controversies with the understanding that marketplace facilitator audits are, in essence, proof cases. The statute may place collection responsibility on the facilitator, but the audit still turns on records, transaction structure, registration status, and whether your returns and deductions tell a consistent story. When those pieces do not line up, CDTFA can start treating facilitated sales as your problem instead of the platform’s.
Our dual-licensed Tax Attorneys and CPAs can help reconstruct the audit trail correctly by separating marketplace sales from direct sales, matching deductions to facilitator reports, testing whether the platform actually qualified as the retailer, and assembling the agreements, account numbers, resale documentation, and transaction records that matter. Where the case involves unsupported deductions, inconsistent records, or facts that could create broader civil or criminal tax exposure, our CPAs work under attorney supervision as part of the legal team to support legal advice and help preserve applicable attorney-client privilege and work-product protections as the law allows.
If CDTFA is questioning whether a marketplace facilitator collected the tax, this is the stage to act with precision. A weak file can leave you paying tax that the platform should have collected or force you into a second dispute over direct sales, district tax, or drop-shipment liability. A strong file can do the opposite by proving exactly who was the retailer, who collected the tax, and why CDTFA should not assess your business for the same transaction twice. Call the Tax Law Offices of David W. Klasing at 800-681-1295 for a confidential, reduced-rate initial consultation HERE.
