When it comes to online earnings on taxes..  

So I was just wondering, when it comes to online earnings on taxes, how exactly do you go about doing the taxes for them? Such as let's say someone's added efforts from a multitude of sites added to be uhh. $3,000 in a calendar year. According to the IRS's site you have to fill Self-Employment taxes out once you hit above $400 income in a calendar year. Would something as simple as a Paypal Payment Log printed out or an actual log sent by Paypal in the mail itself suffice to show where you made those earnings? Orrr! Do you actually have to go to all the individual companies you've earned from and get some kind of further proof that they're in fact the one's that paid you? I know that once you hit a certain amount of earnings on a given site, they send you some kind of tax form that you fill out but yeah. What about all those sites that you may earn very little on, but added together could result in a decent amount of money within a year's time?

Also, other then SE taxes, what other taxes would you have to pay?

I'm not refering to Local & State taxes as they obviously differ from state to state and place to place.

Thanks to everyone who can help!