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@DawnC 

Thanks for your time.

I understand your point about a recovery having to be included in income up to the amount of a tax credit that you take.

What is the interaction between an incentive amount that a State (like Illinois) gives him and Federal tax credits that he takes for this solar system?  Does Uncle Sugar expect him to pay Federal tax on a Illinois state incentive (for a solar system in this case) if he takes the Federal Solar Tax Credit?

Thanks!