The IRS has a web site for dealers to register:
After Jan 1, I want to buy a used EV from a dealer who has registered so that I can get the $4,000 credit immediately and not have to wait until I file my taxes the following year.
Is there a way to search for dealers who are participating?
I’m talking about next year, 2024.
Regs don’t change in 2024. Any (and only) car dealers can provide the credit even if they don’t know it.