Online selling can scale quickly. That’s good for revenue, but it puts pressure on records, VAT decisions and how you report to HMRC. It also changes how your transactions “look” on paper. Instead of one sales ledger and one bank account, you often have several moving parts at once – a storefront or marketplace, a payment processor, a fulfilment partner and sometimes multiple advertising platforms feeding demand. Each one produces its own reports, timelines and deductions, and those do not always line up neatly with what hits your bank.
The other change is visibility. Digital platforms and marketplaces now report seller details and income information to HMRC each year. HMRC can cross-check what platforms report against self assessment returns, corporation tax computations, VAT returns and the digital records you keep under Making Tax Digital (MTD). That doesn’t mean selling online creates a problem by default, but it does mean gaps show up more easily, and inconsistencies take longer to explain if your records are not structured and complete.
This guide is designed as a practical reference for UK businesses selling online. It focuses on what you should keep, how long you should keep it and the reporting rules that now apply to digital platforms. It also flags the most common problem areas we see for online sellers – such as mixing up net payouts with sales, losing track of refunds or treating platform fees inconsistently – and sets out straightforward controls that keep records clean without adding unnecessary admin.