Semiconductors & Foundry Operations

How to Record Chip Binning and Grade Reclassification

Accounting for the reclassification of inventory when a single manufacturing run produces chips of varying performance 'bins' (e.g., Gold, Silver, and Bronze grades).

Account NameTypeDebit ($)Credit ($)
Inventory - Finished Goods (High-Performance Bin)Asset (+)60,000.00-
Inventory - Finished Goods (Standard Bin)Asset (+)40,000.00-
Inventory - Die Bank (WIP Layer)Asset (-)-100,000.00

💡 Accountant's Note

In chip manufacturing, not all 'good die' are equal. Some can handle higher clock speeds (overclocking) while others run hotter. After testing, chips are sorted into 'Bins.' Under the 'Relative Sales Value' method, the total production cost of the wafer is allocated to these bins based on their expected selling price. This ensures the high-margin 'Gold' chips carry a higher cost basis than the 'Value' chips, preventing distorted gross margins across the product line.

Practitioner & Systems Framework

💻 ERP Architecture

Requires a 'Product Transformation' or 'Work Order Disassembly' transaction in the ERP. One 'Parent Lot' from the Die Bank is closed, and multiple 'Child SKUs' are opened in Finished Goods based on the test results.

⚠️ Audit Flags

Incorrect cost allocation. If the company assigns equal costs to high-end and low-end bins, they are 'overstating' the value of the low-end chips, which may eventually require an NRV write-down.

📄 Required Documentation

Final Test & Sort Report, Relative Sales Value allocation worksheet, and the updated SKU price list.

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