I have a fairly simple query. When it comes to setting up as self-employed, I understand it's easier to keep two bank account, one for the business and the other for personal usage. My question is, do you need to keep books and accounts for personal usage as well as business - e.g. small things, like buying a mars bar from a shop, or going out for dinner etc. ? Do you need to keep receipts for even the smallest of personal purchases?