I have a couple of apps in mid-stage of development which I'm hoping to have shippable in mid July. From a coding side of view it's fine but the problem is I don't have any idea about is the business side. I imagine I have to pay tax on anything sold on the App store. Does that mean I have to register as a Sole Trader or something and then fill out tax returns every year? I imagine it's probably the same rules as standard shareware so can anyone give any advice?