I have been buying and selling on Ebay for the past 12 months and would now like to officially setup as a business with the Inland Revenue and get a business bank account etc. For the past 12 months I have been doing this in my spare time (work full time) and only selling about £100 a month worth of goods making only a very small amount of profit. To expand the opportunity and make a larger profit I would like to build an online store and advertise etc. I am aware that once ANY profit is made that you should register with the Inland Revenue but at first I wasn't doing this to make money, only as a hobby. I have kept all of the invoices from my suppliers for the past 12 months and currently have some stock left over which I will sell 'officially', how can I start the business with stock on hand without declaring previous sales / transactions? Invoices for the stock I have show other items which I have sold in the past 12 months but have not paid tax on. Does anyone have any advice?