Assessor

2025 Schedule of Percentages Applied to Historical Costs in Estimating Value of Semiconductor Manufacturing Equipment​​

Semi-conductor manufacturing equipment is used to build semiconductor devices. A semiconductor device (or chip) consists of multiple, highly inter-related mask layers The depreciation factors listed below were developed through:

• The income approach, based upon studies of various income analyses.
• The cost approach, based upon the tracking of semiconductor equipment costs.
• Bureau of Economic Advisors' (BEA) price indexes of such equipment.
• Lengthy analyses of depreciation data and assessment appeals case histories

These factors should be applied directly to historical costs. Any deviation from these factors designed to reflect unusual or extraordinary economic or functional obsolescence, etc., should be documented in compliance with Property Tax Rule 6 (F).