It may be the same number as regular depreciation. According to the instructions for 6251.
For property placed in service after 1998, if the 200% declining balance (DB) MACRS method is used for regular tax purposes, depreciation must be recalculated for AMT purposes using 150% DB MACRS. The difference between regular depreciation and this redetermined amount is an income adjustment subject to inclusion in Alternative Minimum Tax Income (AMTI).
For all other property placed in service after 1998, the depreciation method is the same for regular tax and AMT purposes.
If you need to re-figure for AMT the instructions are here as well.
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