Wouldn't have thought so. You have the choice of whether or not to send the Inland Revenue detailed stuff or not, I seem to recall from the on-line tax form I filled in last week :) Though obviously you need to have all the details to hand should the IR or whatever they're called now choose to come and investigate you. I used to use an accountant and now I just do it all myself, though I'm mainly PAYE and not self-employed full time, so fewer records to sort out. In my experience the tax office is very helpful in answering stuff like this, though for obvious reasons they're very busy at the moment, why not try giving them a ring, I think they open at 8am which might be a good time to get hold of someone.