Since January 2024, online platforms report sellers to HMRC if they make 30 or more sales, or earn about £1,700 (EUR 2,000) or more, in a calendar year. Being reported does not mean you owe tax.
Selling personal belongings for less than you paid is usually not trading, so no Income Tax is due.
That is trading. Over £1,000 of sales in a tax year means you need to register for Self Assessment.
Work out your own figure: the UK Side-Hustle Tax Tracker 2026/27, £4 on Payhip (or the free Lite version) calculates the extra tax and Class 4 NI on top of your PAYE salary.
Written with the help of an AI assistant and checked against GOV.UK on 22 Oct 2026. General information, not tax advice; if in doubt, contact HMRC or a qualified adviser.