I have been asked to do my brothers books as hes starting a part time business buying and selling on the internet alongside his full time employed job. I am aware that he needs inform HMRC that he is also becoming self employed and register for class 2 nat insurance (although may be exempt if earnings are below threshold) and open a separate business bank account. There are no insurances, licences, planning permission needed. Can anyone think of anything I may have overlooked that he needs to do?
Also If I start now, in order to keep his self assesment simple, is it acceptable to complete the year end at 31st march even though he will obviously have only been trading for a couple of months?