Since you claim to be someone with a lot of business experience please tell the rest of us how you will determine the income for something as simple as a proprietorship on your simplified tax form with just 4 entries.
What is the income amount for a business that took in $100,000 in payments and spent $50,000 on materials?
What do you report on your simple form?
You tell me.
You are the one presuming yourself the expert.