If you qualify, you are getting (assuming fully qualifying car) a $7,500 gift. As in $7,500 you do not have to pay ever.I was talking about those who qualify, which will be the vast majority of buyers. If you do qualify then you are getting a $7500 interest-free loan.
One could view their tax payments as repaying it, but the base situation is that those tax payments exist regardless so the situations are:
Without Clean Vehicle Credit:
Pay X in taxes, buy car, pay Y for car. Net outflow: X+Y
With in 2023:
Buy car, pay Y for car, pay greater of zero or X-$7,500 in taxes. Net outflow: somewhere between Y and (Y + X - $7,500 )
With in 2024
Pay X in taxes, buy car, pay (Y-$7,500) for car. Net outflow X+Y-$7,500
So you end up $7,500 to the positive (assuming you would have bought a car anyway)