Earlier quoted context omitted.
I suspect you are European.
In the USA, any non-shady organization will send you a 1099- report of how much income you generated. You're supposed to submit that form when you do your taxes, which is kind of dumb, because a copy of the 1099 was already sent to the IRS. USA tax filing is not efficient for reasons... gives Intuit the stink eye
When you actually understand the system, it makes sense why it is the way it is.