I have also been researching and found
this article on Forbes from 23rd Jan.
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Timing of Guidance
The white paper promised that the proposed guidance would explain the extent to which taxpayers can rely on it until final rules are issued. The length of time that Treasury and the IRS anticipate needing between the proposed and final regulations may dictate that determination.
Considering the heavy roster of clean-energy guidance projects underway and the possibly large number of comment letters on the proposed guidance, the release of final rules could take longer than ideal.
If the proposed guidance is released in late March with a 60-day comment period, it will be nearly June before the IRS and Treasury even have all the comments to work with in preparing the final rules. Even with all possible speed, final regulations are still a fairly long way off.
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It suggests is that the proposed guidelines might be released towards end of March. Also it can take another 60 days on top of it to be finalized and implemented. But on the other hand a Democratic Senator Joe Manchin moved a bill yesterday to pause EV credits until the guidelines are finalized. Lets see what happens but hoping for the best.