If you choose the '100% special depreciation allowance then TurboTax will automatically use 100% of the cost. Under the bonus rules, if property qualifies for the use of bonus depreciation, it is also exempt from the alternative minimum tax (AMT) depreciation adjustment. This would meant that the AMT depreciation is the same as regular depreciation as indicated by @ Tax Expert ColeenD3.
If on the other hand you use Section 179 instead of the bonus depreciation, the same rule applies to the AMT depreciation.
Form 6251 - AMT Instructions
@uschles
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