I agree. Another way to say that is that the ability to take the solar tax credit has nothing to do with how much you have paid or how much you still owe on April 15th. The ability to take or not take the credit is determined after looking at income and deductions and then finding tax due. If the taxes due at that point are zero then you can't take the credit. (You can still take it in later years)
You may be entitled to a refund Before taking the solar tax credit and you could get a Bigger refund. You may have a tax due before taking the solar tax credit, and owe Less after taking the credit.
