I’m registered as self-employed, but I’ve started selling on Etsy and at markets too. Do I need to register a separate business?
Watch out: the cost of training to start a brand-new income stream isn’t an allowable expense against your current business — e.g. a yoga teacher-training course before you’ve started teaching. Once you’re set up and your description is updated, the normal running costs (studio hire, mats and so on) become claimable.