Hi! Hope you're all doing well. Over the last few years I've been buying a lot of material, paper and just general bits and bobs that I really don't need. I was wondering if selling these would count as taxable income? (Not all are bought in the UK, and some are imported). This tax calculator says that I am quite close to the next tax band and don't particularly want to put my income under 40% tax. Hopefully a simple question with a simple answer, but i absolutely can't get my head around it!

Thanks in advance