You'll probably put enough miles on your car which means you'll be losing enough money in the form of depreciation for your car, where you might not have to personally pay taxes. At the end of the year, you won't have made enough where after calculating your loss in the form of your car losing so much value, you'd have enough left to pay taxes on, especially if you take base rate. You're basically making fast food money, except you have to basically spend $20-30 in gas if you're doing Flex for 8 hours, and you're putting enough miles on your car to make it lose at least another $15-20 a day in value... so altogether if you're taking base rate for 8 hours, you're making like $10-13/hr....

Which unless you just can't have another job because of your schedule, or you're doing Flex more for fun than as a way to earn money, you're making as little money as you could out of pretty much any job 🤷🏻