I am currently a SAHM and am looking into selling my art work which is currently a hobby to try and make a bit of extra money. I just wondered how would this work for claiming tax credits? Do I just give an estimate of how many hours I think I will do? What if I don't earn much money will they think it isn't proper work and say we have to pay tax credits back? I am concerned as to how I would prove how many hours I spend painting or whatever, do you keep note of things like this? Thanks.