Like humour said until u meet teh max allowable without paying tax ur safe from it. im not sure what the min allowable earnings are in other countries,but here its like 9k a yr or soemthing like that,anything after 9k u have to pay tax on. And if you earn more then that,and dont pay taxes on it,well here in Canada anyway, they will audit you,and take everything you own, it happened to a friend of mine (not from internet earning mind you) but we were making around 60k a yr drywalling (i paid my taxes) and he didnt pay his taxes on it,well he ended up owing the govt i think was like 12k or some shit over a couple yrs. They found him,put a lean on his house,took his truck,tools of his trade,and left him pennyless. Not worth it to not pay taxes on your earnings