Yes, we have to pay too. My question about this is: How do you go about reporting? I have had several Adsense checks and don't have the checks or stubs anymore or have recorded the info anywhere. From now on I will be saving all of my info and putting aside about 1/4 of my earnings for taxes. How do I know how much to report from the ones I missed? Will google send everything I earned the IRS and will they tell me what I owe or do i have to figure out everything myself? Would it be a good idea to consult an accountant to figure things out for me?
In answer to the original question, and speaking from a UK angle, ALL income must be declared, even if you wash the nieghbours car for $5 - according to the tax office anyway !