Destructive Micro-Sectioning Protocols for Detecting Hyper Corrosion Spikes in ENIG
Destructive micro-sectioning with nitric acid etching isolates ENIG hyper-corrosion spikes under SEM to reject defective PCB lots before assembly.
SMT Rework Cost
Meaning
Financial metrics quantify the total expenditure incurred to repair defective surface mount assemblies on printed circuit boards. When calculating production yields, smt rework cost includes the expense of replacement components, hand soldering labor, and additional thermal testing cycles. The State Taxation Administration (STA) examines these manufacturing expenses during audits to prevent the inflation of operating losses for tax evasion purposes.
Tax Treatment
Expense deductions for manufacturing scrap and repair must be supported by complete yield reports and material disposal certificates. High smt rework cost must be justified by operational logs showing the precise serial numbers of the repaired circuit boards. Tax bureaus routinely reject undocumented repair claims, forcing the company to pay corporate income tax on those disallowed expenses.
Calculation Method
Tracking software records the repair time allocated to each board. Material requisition slips account for replacement microchips. Total labor and component costs are combined with testing machine operating hours.
Transfer Pricing
Disputes arise when overseas parent companies attempt to shift profits by overpaying domestic subsidiaries for reworking assemblies. Auditing agencies scrutinize any smt rework cost that diverges from regional industry averages. Under Chinese transfer pricing regulations, these transactions must be conducted on an arm’s-length basis to avoid severe administrative adjustments and penalties.