Although I've been through the econ courses as many of us have, the real world is the true text. Words on pages make for interesting thoeries, but not so accurate sometimes.
My price would be way less if not for the taxes (income taxes included) I pay. There is absolutely no refuting that. Maybe I misunderstand your assertion - it is absurd as I understand it - that income tax is not paid from my sales revenues and does not affect my price.
There is no book necessary to understand that my price must include all of my costs if I'm going to make my required return.A text book would tell you that income taxes are not a factor of production. Whether you pay them or not, it still costs the same to produce your products. Businesses are not able to price their products based on their "required return."
My price would be way less if not for the taxes (income taxes included) I pay.So you price your goods or services based on what you need, not what you can get? So you don't believe in maximizing profits.