ok complete noob 2009 has been my first earning year. I work for at least 3 networks earned over $600 dollars with. I have another job where i earn a regular paycheck My affiliate companies have my w-9 I am filed under each co. under my ss# I do not have a buisness Id number What is the deal with quarterly taxes? Do I need to be concerned with this? Any tips on how to pay as little as possible other then deductions? Like working for 20 companies making like $500 at each and only making over that with one and paying taxes on that? Would that be illegal?