I have recently registered at Self Employed Sole trader. Just in the last month. I am reading and re-reading and feeling a bit overwhelmed by it all and as a result worrying that I may not be doing things write. I registered for this as I am between jobs and temping for a company where I bill them every month on an hourly rate. In terms of paying tax and national insurance it looks like I should be putting money away for tax which I would then pay next year. What about National Insurance though - should I not be paying this every month or does that also get calculated and paid next year when I submit self assessment. Any advice would be greatly appreciated.