Is Proof of Income Required to Consider Google Adsense Earnings as Revenue?

[nureteru]

Friends, as you know, when it comes to banking products like loans and credit cards, there is a requirement to provide proof of income. While any kind of income can be documented, is it necessary to pay taxes in order to prove this income? EDIT: Friends, I am aware that in order for an income document to be considered an official document, taxes must be paid. Is this correct?