Property placed in service before 1999

For property placed in service before 1999, refigure the AMT depreciation using the ADS, with the same convention used for the regular tax. See the table within this line instruction for the method and recovery period to use.

IF the property is THEN use the IRC Section 1250(c) property Straight-line method over 40 years. Tangible property (other than IRC Section 1250(c) property) depreciated using straight-line for regular tax Straight-line method over the property's AMT class life. Any other tangible property 150% declining balance method, switching to straight-line the first tax year gives a larger deduction over the property's AMT class life.

Get federal Pub. 946, How to Depreciate Property, for more information on AMT class life.