Final answer:
The claim that the half-year convention must be used for personalty under ADS is false. ADS typically mandates straight-line depreciation over its own recovery period and may require the mid-month convention or not specify a convention for certain types of property.
Step-by-step explanation:
The student's question pertains to the alternative depreciation system (ADS) under U.S. tax law and the conventions applicable to the depreciation of property. Under ADS, the statement that the half-year convention must be used for personal property (personalty) is false. ADS generally requires the use of the straight-line depreciation method over the ADS recovery period, and specific conventions like the half-year, mid-quarter, or mid-month may not be applicable as they are under the General Depreciation System (GDS). For certain types of property, the mid-month convention is required under ADS, while other types of property may not be subject to any specific convention.