This question already has an answer here:
My employment provides me with a W-2 at the end of the year, and I currently have taxes withheld from my paychecks. In the opposite of this question, Pay estimated tax using W-4 withholding instead of quarterly payments, I'd like to know if I can elect to have zero withholdings from my paycheck and instead make estimated payments with a 1040-ES.
In this case, I have a generally good idea of my exact tax liability, so I can easily make quarterly payments without trying to predict fluctuating income. I'd just like to make sure it's legal to make quarterly estimated payments if you have income that would ordinarily pay taxes through withholdings.