It would appear that using 150 DB is an option rather than a requirement. In this regard, IRS Publication 527 provides that typically property in the 5-year class uses the 200% declining balance method and a half-year convention. Moreover, the instructions for Form 4562 provide that generally, for 5-year property, the applicable method is the 200% declining balance method, switching to the straight line method in the first tax year that the straight line rate exceeds the declining balance rate. However, the taxpayer may choose on Form 4562 to elect a 150 DB method which is irrevocable once elected.
You will not have an AMT adjustment for any property included under this election to use 150 DB for 5-year property.
Below is a link to the IRS instructions for Form 4562.
Instructions for Form 4562
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