I have a very small business and do cash in hand work a few hours a week and earn £30 - £60 a week, no more, so not exactly a fortune. I have been doing it about 6 months, it comes in handy. dh works, doesn't earn loads, about 23k, we have two little DC. we use it towards the food bill usually.
And I have NO intention of declaring it as it will screw up our already measly tax credits. In fact, I actually feel quite smug for doing it, as we get screwed enough in this country and have every last drop of money squeezed out of us in petrol prices, gas and electric food prices, property prices etc so why shouldn't we keep something for us?
my intention is to slowly build my business then when both DC are at school I will go "legit" and declare it all. AIBU?