No, you did not answer my example and questions.
Do you understand why businesses couldn’t pay tax on revenue?
As for income/profits, you’re just getting yourself all confused. When you earn an income from a job, you pay tax on the profit after you’ve deducted your costs. This is what your tax return is - your chance to claim all your costs that you paid in earning that income, thereby reducing the taxable income. You’re just getting confused because the tax is automatically taken out every pay.
I assume you think you’re talking to someone else right now……?