Deemed Supply vs Agency Sales: Who Accounts For VAT on Marketplace Transactions?

Deemed Supply A transaction that VAT law treats as a supply by a party such as an online marketplace even though the commercial sale may involve another seller. Distinguishing a deemed supply from an agency sale is one of the most important tax determinations for platforms, sellers, and logistics partners because it dictates who accounts for VAT, who issues invoices, and who holds compliance risk.

Although commercially a marketplace may call itself an agent or intermediary, tax law looks to the substance of the transaction. The difference between an agency model and a deemed supply often turns on control, contractual relationships, and where risks and rewards of ownership lie. For warehouses and 3PLs, the outcome affects invoicing workflows, return handling, and the documentation needed for cross‑border shipments.

Key Legal Tests That Tax Authorities Use

Tax authorities use tests (and sometimes statutory deeming language) rather than labels in contracts. Common tests include:

• Contractual Counterparty: Is the sale contract between the buyer and the seller or the buyer and the platform?
• Control Of Price: Does the platform set or materially influence the retail price visible to buyers?
• Title And Risk: Does ownership pass from seller to buyer, and who bears physical loss or damage before final delivery?
• Payment Flows: Does the platform receive the payment from the buyer and remit to the seller?

When the platform is the contracting party, sets price, and receives payment, many jurisdictions treat it as the supplier for VAT despite contractual labels saying it acts as agent.

VAT And Accounting Consequences

Positioning the transaction as a deemed supply rather than an agency sale affects accounting and tax processes:

• Supplier on Invoice: Deemed-supply makes the marketplace the supplier on the VAT invoice; in agency sales, the underlying seller remains the supplier.
• VAT Registration: The marketplace may need to register for VAT in buyer jurisdictions where it is deemed the supplier.
• VAT Collection: The platform must charge and remit VAT at the point of sale if it is treated as the supplier.
• Sellers’ Reporting: Sellers may report income net of marketplace settlements rather than gross sales including VAT.

Why Contracts Alone May Not Protect Sellers

Tax authorities can disregard contractual statements of agency and apply deeming rules. Common pitfalls:

• Form Over Substance: A statement in T&Cs that the platform is an agent will not prevent a deemed-supply treatment if operational facts point the other way.
• Incomplete Risk Allocation: Contracts that do not align invoicing, payment, and logistics flows leave gaps that tax authorities can exploit.
• Cross-Border Complexity: A platform may be deemed supplier in one jurisdiction but agent in another, requiring complex reconciliations.

Practical Steps For Marketplaces, Sellers And Warehouses

• Conduct a facts-and-contract audit: Compare operational reality (payments, contracts, logistics) against the declared legal model.
• Align invoicing and settlement: Ensure invoices, settlement statements, and VAT returns consistently reflect who the law treats as supplier.
• Adjust WMS/ERP flows: If the platform is deemed the supplier, ensure warehouse shipping labels, customs declarations, and return routing identify the platform appropriately.
• Document allocation of VAT risk: Place clear indemnities in seller agreements and maintain proof of seller status where appropriate.

For 3PLs and warehouses, practical consequences include ensuring that customs paperwork and commercial invoices align with the party treated as the supplier for VAT; mismatches can trigger customs inspection, VAT assessments, or delays in clearance.

When Agency Treatment Still Applies

Agency treatment is still respected when the platform genuinely acts as an agent: the seller sets the price, the contract is directly between buyer and seller, the seller takes title and risk, and the platform performs a matchmaking or marketing role only. In those circumstances, the seller remains the VAT supplier and is responsible for tax charges and filings.

In short, the Deemed Supply concept can reassign VAT supplier status from a merchant to a marketplace despite agency language in contracts. Operational facts — who controls price, payment and logistics — matter more than labels. Platforms, sellers, and warehouses should perform a transaction-by-transaction review, align systems and invoices, and use clear contract language plus indemnities where necessary to manage VAT risk.