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@JMac2021 wrote:

What do you mean by unused bonus depreciation? 

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Basis x 80% is Bonus depreciation.  Then subtract the allowable $20,200.  That leaves the 'unused' Bonus depreciation that can't be used until year 7.

It should still have some depreciation though (probably Basis x 20% x 32%), so I'm unsure why it is not doing that.