How to Calculate VAT on Marketplace Sales

A marketplace settlement can look reassuringly simple: sales less fees equals the amount paid into your bank. For VAT purposes, that figure is rarely the right starting point. To calculate VAT on marketplace sales accurately, you need to separate the customer sale, the marketplace’s commission, any refund, and the party legally responsible for accounting for VAT.

For a growing e-commerce business, getting this wrong can distort both VAT returns and management accounts. It may overstate turnover, understate recoverable input VAT, or create unexpected liabilities when stock is held overseas. The objective is not merely to submit a compliant VAT return. It is to maintain financial information that shows what the business has genuinely sold, earned and owes.

Start with who is making the taxable supply

The first question is not the VAT rate. It is whether you or the marketplace is treated as making the supply to the customer.

For a UK VAT-registered business selling its own UK-held stock to UK consumers through a marketplace, the position is usually straightforward. The business makes the sale, charges VAT where applicable and accounts for output VAT on its VAT return. The marketplace is providing a separate service - typically listing, fulfilment, advertising or payment-processing services - and charges its fees independently.

However, online marketplace rules can make the platform the deemed supplier in certain transactions. This commonly applies where goods are outside the UK when sold to a UK consumer in consignments valued at £135 or less, and where goods already in the UK are sold by an overseas seller to UK consumers. In these cases, the marketplace may be responsible for charging and accounting for VAT on the customer sale.

That distinction affects more than the VAT return. It changes how turnover is recorded in the accounts and whether VAT should appear on your sales invoices or marketplace reports. A UK seller using overseas inventory, selling across borders or using a fulfilment programme should review each sales flow rather than applying one treatment to every marketplace order.

How to calculate VAT on marketplace sales in the UK

Once you have established that your business is responsible for VAT on the sale, the calculation itself depends on whether your sales figure is VAT-exclusive or VAT-inclusive.

If the price shown to the customer is exclusive of VAT, multiply the net selling price by the applicable VAT rate. A £100 standard-rated sale produces £20 of output VAT, so the customer pays £120 in total.

Most consumer marketplace prices are shown inclusive of VAT. For a standard-rated sale, do not calculate 20% of the gross amount. Extract the VAT using the VAT fraction of 1/6. A £120 customer payment includes £20 VAT and £100 net revenue:

Gross sale ÷ 6 = VAT at 20%

The same principle applies at other rates, but the fraction changes. Reduced-rated supplies at 5% use 1/21 of the VAT-inclusive value. Zero-rated sales carry VAT at 0%, while exempt sales follow different rules and may restrict input VAT recovery. Product classification matters, particularly where a business sells a mixture of standard-rated goods, zero-rated items and services.

A marketplace settlement example

Assume a UK VAT-registered retailer sells a standard-rated product for £120 through a marketplace. The price is VAT-inclusive. The marketplace charges a £18 commission plus £3.60 VAT, then deducts £21.60 from the settlement.

The accounting position is:

• Customer sales: £120 gross, comprising £100 revenue and £20 output VAT

• Marketplace commission: £18 expense plus £3.60 recoverable input VAT

• Bank settlement: £98.40

The £98.40 received is not turnover. It is the net cash settlement after the platform has deducted its fee. For the VAT return, the business would normally report £20 output VAT on the sale and reclaim £3.60 input VAT on the commission, leaving £16.40 payable in relation to those two entries.

This is why recording only bank deposits creates unreliable numbers. It hides sales volume, understates marketing or selling costs, and can lead to VAT being calculated on the wrong figure.

Treat marketplace fees as a separate purchase

Commission, fulfilment, storage, subscription, advertising and payment fees should be reviewed separately. Where the supplier has charged UK VAT and the cost relates to taxable business activities, that VAT can normally be reclaimed as input VAT, subject to the usual evidence and partial-exemption rules.

Do not assume every deduction includes UK VAT. A marketplace may invoice through an overseas entity, apply a reverse-charge mechanism, or show fees in another currency. In some cases, you may need to account for reverse-charge VAT on the service rather than reclaim VAT shown on an invoice. The invoice, supplier details and service location determine the correct treatment.

The commercial benefit of this discipline is clear. Fees are often a significant proportion of marketplace revenue. Separating them correctly gives directors a truer view of contribution margin by channel, product and territory.

Refunds, credits and chargebacks need their own treatment

A customer refund is not simply a reduction in the next payout. If you originally accounted for output VAT on a sale, a valid refund normally reduces the associated output VAT as well.

For example, refunding the £120 sale above would generally reverse £100 of revenue and £20 of output VAT. If the marketplace refunds only part of the order, the VAT adjustment should reflect the value actually credited. Keep the refund reference linked to the original order so the adjustment can be supported if HMRC asks for an audit trail.

Chargebacks require more care. The platform may deduct cash before the underlying dispute has been resolved. Whether VAT can be adjusted depends on the facts, including whether the sale has been cancelled, whether goods have been returned and whether the debt has become genuinely bad. A cash deduction alone does not always justify reducing output VAT.

Build the VAT return from transaction-level data

Marketplace reports are useful, but they are not automatically VAT-ready. They can combine orders, refunds, fees, gift-wrap income, shipping charges, withholding amounts and currency conversions in a format designed for settlements rather than statutory reporting.

A reliable process reconciles transaction-level marketplace data to the accounting system and then to the bank. For each reporting period, retain the sales report, fee invoices or statements, refund data, inventory-location information and evidence of VAT charged by the platform. The records should make it possible to explain the figures in the VAT return without relying on a single net payout figure.

For businesses using Xero and e-commerce integrations, the quality of mapping is critical. Sales must be posted gross of fees, VAT codes must reflect the place of supply and rate, and settlement clearing accounts should reconcile to the amount received. Automation can reduce manual effort, but it cannot correct an incorrect VAT rule or a poorly configured chart of accounts.

Watch the tax point, not just the payout date

Marketplace settlements may arrive days or weeks after the customer places an order. VAT is normally driven by the tax point rules, not by when the platform releases funds. Using payout dates as the sole basis for quarterly VAT reporting can move sales into the wrong return period.

The right approach depends on how payment is taken, when an invoice is issued and the precise contractual arrangement with the marketplace. A regular reconciliation between order dates, dispatch dates, invoices and settlements helps identify timing differences before the VAT return is submitted.

Common errors that create avoidable VAT exposure

The most frequent error is treating the marketplace payout as the sale value. The next is calculating 20% of a VAT-inclusive price, which overstates VAT. Businesses also commonly overlook VAT on marketplace fees, fail to process refund adjustments, or apply UK VAT to sales that should be treated under marketplace deemed-supplier or overseas VAT rules.

Registration should also be monitored using taxable turnover, not cash received after platform deductions. The UK VAT registration threshold can change, and marketplace sales patterns can accelerate quickly during promotional periods. A business approaching the threshold needs timely forecasts, particularly where several sales channels are growing at once.

Where stock is held in another country, local VAT registrations, reporting and invoicing requirements may arise even if the business is UK-established. This is an area where a channel-by-channel and country-by-country review is usually more valuable than a generic VAT calculation.

Clean marketplace VAT reporting begins with the right legal analysis and ends with reconciled records. When sales, fees and refunds are kept distinct from the first transaction, VAT becomes a controlled cost of trading rather than an unwelcome surprise at quarter end.