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?
They don’t need to be registered to get you the credit this year so even if you could track that it’s not a full picture of who would and who wouldn’t. Anyone willing to fill out a 15400 form is a participant. Bring it with you when you buy and don’t sign the papers with finance until they fill it out and promise to file
I’m talking about next year, 2024.
I wouldn’t worry about it for 2024.
Dealers are going to be claiming the credit for themselves, and then passing it on to you via a discount. This is money in their pocket. Dealers are not going to pass up free money. It may be a bit rocky in early Jan as the system works the kicks out, though.