I am not sure I understand.
You installed the panels in 2017. Did you take a tax credit for them in 2017?
If you did, did you have unused credit that you carried over to 2018?
If you were unable to use all of the credit in 2018, then you can use the carryover in 2019 to the extent that you have enough taxes assessed.
"tax reliability is huge in 2019, since withdrawal from 401K over 70." Are you saying that you have a huge tax liability in 2019, because of a large distribution from your 401(k)?
If you did not take the credit for the panels in 2017 (the year you installed them), then you will need to go an amend your 2017 return, then if you have a carryover of unused credit, amend your 2018, and if you still have carryover of unused, you can apply that to 2019. But you can't just apply the whole thing to 2019 if you installed them in 2017.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
