Selling online can grow quickly—but with that growth comes added complexity in how your income is recorded, reported, and reviewed by HMRC. This guide is designed to help UK-based online sellers make sense of that complexity. It explains how different platforms, payment processors, and fulfilment systems affect your financial records, and why transactions don’t always match what reaches your bank account. It also outlines the increasing transparency between digital platforms and HMRC, and what that means for your tax reporting obligations under Self Assessment, Corporation Tax, VAT, and Making Tax Digital (MTD).
Alongside this, the guide highlights common mistakes—such as confusing net payouts with total sales or misreporting fees and refunds—and provides practical steps to keep your records accurate, consistent, and easy to manage as your business scales.
