Marketplace sellers: why California and Washington need separate tax reviews

A seller can receive reports showing marketplace sales tax collection in both California and Washington and still reach different conclusions about its own obligations. Each state's rules determine registration, reporting, and taxes beyond retail sales tax. Review the legal entity's facts before copying one state's treatment into another.

Start with a state-by-state schedule of sales channels, customer destinations, employee locations, and owned inventory. Identify direct website sales separately from marketplace sales. The review should name the tax being assessed: retail sales tax, a gross receipts tax, and a corporate income tax are not interchangeable entries in a compliance calendar.

CDTFA says a marketplace seller is not required to register for a seller's permit or use-tax registration when all its sales in California or for use there are qualifying marketplace sales. The facilitator must be registered or required to register and be treated as the seller for those transactions. This is a specific sales-and-use-tax conclusion, not an exemption from every California obligation.

Direct sales can change the analysis. California also includes marketplace sales when assessing its economic nexus threshold. Ask the adviser to evaluate the actual mix of channels, physical activities, and the current rule. A marketplace statement cannot establish that every order in your own store is covered by the facilitator's collection arrangement.

Washington's guidance says marketplace sellers meeting its nexus criteria must report and pay business and occupation tax even when they sell only through marketplace facilitators. It separately explains the retail sales tax deduction for sales on which the facilitator collects and pays that tax. Keep the two tax calculations distinct in the working papers.

The state's gross income reporting includes the total selling price and does not allow marketplace commissions or fees to be deducted merely because they reduce the payout. Therefore, a net settlement report alone is not enough to prepare the state calculation. Preserve gross sales and fee detail so the adviser can apply the relevant classification and reporting rules.

Washington identifies stock held by a marketplace facilitator or another third-party representative as an activity that can create physical presence nexus. It also lists employees working in the state. Review these facts before treating the business as a remote seller assessed only by its sales volume.

Ask the fulfillment provider for a history of where your inventory was stored, with dates, rather than only the warehouse to which you originally shipped it. Establish who owned the stock during each period. Keep later transfers and returned inventory distinguishable from the initial shipment. An operations team may know about a relocation before the finance team sees any new cost.

Use that history to ask the adviser when a state obligation began and whether earlier periods need review. The outcome should identify the applicable tax and period, with unresolved facts visible. Avoid selecting a convenient start date from the first month your accounting software happened to import the warehouse data.

Retain the marketplace agreement, tax reports, and evidence identifying the facilitator and its coverage. California advises sellers to keep documentation supporting the facilitator's responsibility for collecting and paying the tax. Organize it by marketplace and period so the records explain the transactions being reported.

Reconcile those records to channel sales and the ledger. Separate marketplace tax from direct-channel tax, refunds, fees, and held funds. If a report changes after a refund or correction, preserve the revised version and explain the adjustment. The person preparing state returns should be able to trace the relevant sales without treating every bank payout as a fresh sale.

Ask your accountant to record a conclusion for each state, including the tax types reviewed, assumptions, periods, required filings, and any excluded work. Where no registration is required, retain the reasoning and the facts supporting it. A short dated note is easier to revisit than a verbal assurance that the marketplace handles tax.

Name the changes that will trigger another review, such as opening a direct store, moving stock, hiring an employee, or entering a new sales channel. If an account is already registered, verify filing and closure requirements before stopping returns. Keep the latest official guidance with the review and assign future monitoring to someone who receives operational changes as they happen.