from the IRS faq website, basically even if you don't owe any taxes, you still get the $7500 pos tax credit and they won't make you pay it back.
Q4: What if a buyer has insufficient tax liability to fully use a transferred credit? (added Oct. 6, 2023)
A4. The amount of the credit that the electing taxpayer elects to transfer to the eligible entity may exceed the electing taxpayer's regular tax liability for the taxable year in which the sale occurs, and the excess, if any, is not subject to recapture from the dealer or the buyer.