01/06/2026
In an EU VAT audit of a marketplace, what decides whether the platform owes VAT on the full transaction or only its margin is rarely the vendor agreement. It is the Stripe setup.
Article 9a tests two functions in how a sale actually runs: who authorises the charge to the customer, and who sets the price. If the marketplace’s account receives the customer’s payment before splitting it to vendors, the marketplace authorises the charge. If the platform’s pricing engine produced the number the customer saw, the platform sets the price. Either function in the platform’s hands makes the platform the supplier under EU VAT — regardless of what the vendor agreement says.
The implication does not stop at the current quarter. Prior OSS filings get reassessed on the full transaction value, not on the retained commission. The pass-through with underlying vendors creates a mismatch a standard accountant has no reason to look for.
The diagnostic is mechanical: walk through one real sale on your platform. Whose merchant account first receives the customer’s payment? Whose pricing logic produced the price they saw? Either answer pointing to the platform is the gap.
The question worth answering is which of those answers is actually true for your platform — before an audit answers it.
Full breakdown → https://efinance.ee/article?slug=supplier-intermediary-platform-eu-vat