Overview
- Over £1,000 combined trading income in 2024–25 triggers Self Assessment registration, return filing, and payment by 31 January 2026.
- A GOV.UK checker is available to tell people whether their side-income needs reporting.
- HMRC distinguishes non-taxable decluttering from taxable trading such as making or buying items to sell for profit.
- Online marketplaces must report high-volume sellers (typically 30+ sales and earnings above about £1,700), increasing detection of undeclared income.
- Market operators have welcomed the guidance, as HMRC research points to a sizable hidden economy with many side-earners unaware of their obligations.