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>this also applies if you transfer the credit to the dealer at point of sale

No, it does not. See Q4 at the following link:

https://www.irs.gov/newsroom/topic-h-frequently-asked-questi...

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My understanding is that the dealer has to have the tax liability. IANATL, YMMV.
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>money is fungible

And then you contradicted yourself 2 phrases over.

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