The term for making money based on a percentage of the total sales you make is called a "sales commission." This typically involves earning a commission rate, which is a percentage applied to the sales revenue generated, resulting in a commission payout. For example, if a salesperson has a 5% commission rate and closes $100,000 in sales, they earn $5,000 in commission. This is a common method for incentivizing sales performance and can have various structures like straight commission, base salary plus commission, or tiered commission rates depending on the business model.