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First, you have calculated the basis correctly
The panels are eligible for the 50% bonus, and they are 5 year property
I'm assuming you already knew about Pub 946 Deprecition
So if you were looking for confirmation that you are correct, then I can absolutely give you that
Is there anything else I can help you with?
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Because of the 50% grant reduction, there would be a book and tax depreciation difference (M-1) adjustment?