Yes indeed; I think you make a lot of good points here, jsd. I think that these are among the many reasons why the Revenue, in its infinite wisdom, hasn't yet tried to assess anyone for income tax on spread-betting winnings by claiming that it's his/her sole income. I think there are a number of other reasons as well, and that in practice it will probably be quite a long time before there's a test-case on it. It took them a long time to take anyone to court for income tax on horse-race winnings when it was their sole income and declared profession, although admittedly the principle's now well established, and with a body of supporting case law, that the "normal" income-tax exemption on horse-race winnings doesn't apply to a full-time professional horse-race backer. This has been debated (exhaustively!) in other threads here. But clearly you're right to point out that there are "ways round it", perfectly legally and properly. I suspect that (as with other areas of tax law) there'll only be litigation over it (and therefore applicable case-law) when they find someone really bloody-minded who wants do dig his heels in and have a really big public fight with them regardless of the potential expense. (It's not going to be me!). Until then it remains a bit of a grey area. My own personal opinion (not that I'm an accountant) is that for the moment, there's no need to worry too much about the prospect of being assessed for income-tax on spread-betting profits.jsd said:hmm wonder if it was say someones sole source of income being taxed and being earned under self employed basis etc if they then would have to (by acknowledgement of the former) allow you to offset any future potential losses into next period? and you would i assume if being assessed for income purposes produce a trading p+l account netting off cost of sales against revenue etc. less expenses? pay the wife 10k to make you coffee and ummm file things...expenses, professional fees , capital goods tax allowances,depreciation on lots of things (hmmm, you'd need an accountant to get creative here ) casual labour expenses for stress relief from the visiting massage lady, and on and on.... crikey almost a respectable enterprise lets face it mp's make 120k vanish in expenses.