The commission is usually a percentage of the total sale price, and it can range from 5% to 8% depending on factors like the sales structure, market, and company. This commission is often paid in stages. It varies based on deal size, structure, company model, and your ability to navigate a system that rewards strategy over effort alone. But once you understand how the math works, you unlock the tools to shape your income ceiling. Straight Percentage of Sales (Revenue-Based. Calculate your solar commissions instantly with the only calculator built specifically for solar professionals.