Semiconductor Activity-Based Costing

Replacing Peanut Butter Costing with Granular Semiconductor Cost Transparency

A global semiconductor manufacturer required a structured semiconductor activity-based costing framework to replace inconsistent and manual costing processes across six fabrication plants. Prior to implementation, each site applied different methodologies to calculate actual costs, resulting in fragmented reporting and limited confidence in product profitability. Leadership needed a governed, enterprise level approach capable of delivering detailed SKU level cost visibility.

The Challenge of Inconsistent Multi Plant Costing

The organization relied on spreadsheet driven models containing more than one million data cells at individual fabrication facilities. Costs were often spread across products using aggregate allocation methods, preventing accurate end to end product cost calculations across front end fabrication and back end test and assembly operations. Additionally, cost data lacked drill down capability, making it nearly impossible to answer root cause questions quickly or confidently.

How ImpactECS Enables Semiconductor Activity-Based Costing

• Integrate Workstream MES and PeopleSoft ERP data including general ledger, BOM, and operational information
• Calculate detailed actual costs using activity-based costing methodology at the unique SKU level
• Align costing rules across six fabrication plants while allowing site specific configuration
• Trace spending from general ledger accounts through activities and processes to product line P&L
• Develop standard machine hour rates and process level cost pools
• Provide process cost drill down into direct spending line items

Business Impact Across Fabrication and Assembly Operations

• Standardize costing methodology across front end and back end facilities
• Shift corporate strategy from standard to actual activity-based costing for decision making
• Reduce spreadsheet dependency and eliminate manual errors
• Increase frequency of cost updates to support monthly transparency
• Enable finance, operations, and supply chain teams to own cost inputs and outputs
• Answer complex “why” cost questions in hours instead of weeks

With ImpactECS, the manufacturer implemented a governed semiconductor activity-based costing environment that reconciles operational and financial data across plants. As a result, leadership gained reliable product line P&L visibility and strengthened accountability at each fabrication site.

This disciplined semiconductor activity-based costing framework transformed cost transparency, enabled scenario analysis, and created a scalable foundation for long term manufacturing performance management.