[Principled]

But you don't have the other variable to plug into the formula, the amount of profit, as you do with the other costs.

With a light bill, you can't plug in the KWH until the bill arrives. Nor can you always know what rate is being used, as the rates vary for a number of reasons.
With a copier bill, you can't plug in the # of copies until the bill is arrives either.

So how is it different besides being it being something you want to think isn't paid with sales revenues?

[justshutupandtakeit]

But you are not grasping the difference in the light bill and an income tax bill. A light bill is upon a Factor of production, energy. An income tax bill is NOT based upon a factor of production and therefore cannot be a "cost." ONLY factors of production have costs.

You are also confusing your income requirements to live with profit of a business. You must seperate the profit from your business from the amount which you must earn to live. Only by doing this will it become clear what the income tax is. If you were in a position where you COULD not change your price it would also be clearer. THAT is the market model.