VAT for UK eCommerce Businesses: Registration, Returns, and Common Mistakes

VAT registration: when you must and when you should#

Mandatory VAT registration is required when your taxable turnover in any rolling 12-month period exceeds £90,000. You must notify HMRC within 30 days of the month end in which the threshold was breached. Voluntary registration below the threshold is available and is advantageous when your customers are primarily VAT-registered businesses (who can reclaim the VAT you charge) or when you incur significant VAT on purchases that you could reclaim. For consumer-facing eCommerce businesses below the threshold, voluntary registration charges VAT to customers who cannot reclaim it — effectively making your products 20% more expensive than competitors who are not VAT-registered.

VAT on marketplace sales: the deemed supplier rules#

From January 2021 for overseas sellers and April 2021 for all sellers, UK marketplaces (Amazon, eBay, Etsy) became the deemed supplier for VAT purposes on many transactions. This means Amazon or eBay collects and accounts for VAT on your behalf on qualifying sales. For UK-based sellers, the deemed supplier rules apply to overseas sellers using the marketplace — but UK sellers remain responsible for their own VAT accounting on marketplace sales. Understanding which sales your marketplace accounts for VAT on and which you must account for yourself is essential to avoid double-counting or missing VAT.

Selling into the EU: IOSS and OSS#

Since July 2021, all goods sold to EU consumers are subject to EU VAT regardless of value. UK sellers can register for IOSS (Import One Stop Shop) to collect EU VAT at the point of sale and remit it centrally — improving customer experience (no surprise charges on delivery) and simplifying compliance. Without IOSS, the customer pays import VAT plus handling fees on arrival — creating a poor experience. OSS (One Stop Shop) applies to services and digital goods sold to EU consumers — a single EU registration allows you to account for VAT across all EU member states without registering in each.

The most common eCommerce VAT mistakes#

Treating all UK sales as standard-rated: some products are zero-rated (children's clothing, most food, books, newspapers) or exempt — charging 20% VAT on zero-rated items overcharges customers and creates VAT liability the seller does not owe. Missing the registration threshold: failing to monitor rolling 12-month turnover and registering late creates retrospective VAT liability plus penalties. Incorrectly reclaiming input VAT: VAT on business entertainment (meals, client events) is not reclaimable. VAT on personal purchases on the business account is not reclaimable. Ignoring overseas VAT obligations: businesses selling across borders have VAT registration obligations in some markets regardless of UK registration status.

Making Tax Digital for VAT compliance#

All VAT-registered businesses must submit VAT returns using Making Tax Digital-compatible software — manual entry on the HMRC website is not permitted. Compatible software (Xero, QuickBooks, Sage, FreeAgent) connects directly to HMRC's API and submits returns digitally. Your VAT records must be kept digitally in a compatible format. HMRC can audit digital VAT records and request access to the underlying transaction data — making accurate, complete digital record-keeping essential rather than optional.