@TomD8 - I don't know the answer either, but this is from Form 5695 instructions
"Costs. For purposes of both credits, costs are treated as being paid when the original installation of the item is completed"
So if I install the solar in phases, each item is originally installed.... it doesn't say when the SYSTEM is installed; it is when THE ITEM is installed.
further, the instructions state:
Who Can Take the Credits
You may be able to take the credits if you made energy saving
improvements to your home located in the United States in
2021.
it never states installing 'a system'; it states making improvements...... so if I do it in phases, what is the issue?
