I've recently got a second income (not PAYE) and I have no idea how much of it I should be putting away for the tax bill when it comes around. For my main job I earn approx £30k per year and so far this tax year I've earns around 2.5k from my second income. I'd like a rough idea if anyone can help at all as to how much I should be setting aside as I'm terrified of getting stung for money I don't have so at the minute I'm setting aside almost 50% which I'm hoping is far too much. I know no k w can give me exact figures but if anyone can explain a ballpark percentage is be eternally grateful.