For those wondering whether if tax credit will apply in 2022 or 2023 since we are entering into this binding purchase agreement in 2022, the answer is the year the car is placed in service (meaning delivered and driven).
www.irs.gov
Key word is "placed in service" which is technically the date we acquire and drive the vehicle. They also gave an example:
The credit for qualified two-wheeled plug-in electric vehicles expired for vehicles acquired after 2021. However, if you acquired the two-wheeled vehicle in 2021, but placed it in service during 2022, you may still be able to claim the credit for 2022. Do not report two-wheeled vehicles acquired after 2021 on Form 8936 unless the credit is extended.