If you are a real business and file a schedule C you will pay 10% Federal tax as soon as you hit $8,900 in profit which is essentially minimum wage. You will also be required to pay 15.3% in Social Security as there is no employer match. So out of the gate if you are a REAL BUSINESS earning any kind of income that you would call "full time" you'll start out paying 25%. This does not include other business taxes from local or state municipalities. If you are not a real business and you do not file a schedule C you will pay whatever rate you are paying for the bracket you are currently in.
the right question is : what is your taxable income ? if you are a business you can end up paying zero taxes. get incorporated. if you are an employee then you are screwed.
thanks to the country i live in and some creative accounting i pay 0% tax but that is the very small risk i take
a business pays taxes after making its expenses. near zero taxes are possible if you can get a really creative accountant.