internal failure cost

Internal failure cost is a component of the cost of poor quality (COPQ) that captures all costs incurred when defects, nonconformances, or process failures are detected before the product or service leaves the organization.

It typically includes unplanned activities and losses that occur after a defect is created but before delivery to the customer, such as rework, re-inspection, scrap, and unplanned troubleshooting on the shop floor or in engineering.

What internal failure cost includes

Depending on the organization’s cost model, internal failure cost commonly covers:

• Scrap and write-offs of materials, components, or finished goods due to nonconforming product
• Rework, repair, or modification effort to bring nonconforming product back into specification
• Re-inspection and re-testing required because of discovered defects or process failures
• Unplanned troubleshooting, root cause investigation time, and corrective work tied to specific internal defects
• Downtime, changeovers, and delays directly attributable to internal quality issues
• MRB (material review board) processing time and associated handling of nonconforming material

In regulated manufacturing (for example aerospace, medical devices, or pharmaceuticals), internal failure cost may also track extra batch documentation work, additional validations, or controlled rework steps that occur because of identified internal nonconformances.

What internal failure cost excludes

Internal failure cost generally does not include:

• Prevention and appraisal costs, such as training, planned inspections, calibration, or process capability studies
• External failure costs, such as warranty claims, field repairs, chargebacks, returns, or regulatory actions after delivery
• Routine operating expenses that would occur even if no defects were present

Operational use in manufacturing systems

In industrial and regulated environments, internal failure cost is often:

• Captured through nonconformance reports, defect codes, and rework orders in MES, QMS, or ERP systems
• Linked to specific work orders, batches, programs, or production lines to support COPQ analysis
• Mapped to financial accounts so that executives can see the impact of internal defects on the profit and loss statement

Clear definitions and stable categorization are important so that internal failure costs can be trended over time, compared between programs, and reconciled with financial data.

Common confusion

Internal vs. external failure cost: Internal failure cost stops at the point where the product or service leaves the organization’s control. Costs arising after shipment or release, such as customer returns or field corrective actions, are typically classified as external failure cost.

Internal failure vs. scrap only: Internal failure is broader than scrap. It also includes rework, re-inspection, and other internal activities required to handle and correct defects.

Relation to cost of poor quality (COPQ)

Internal failure cost is one of the main categories in many COPQ frameworks, alongside external failure, appraisal, and prevention costs. In executive reporting, internal failure cost is often reported separately to distinguish in-plant quality performance from customer-facing quality performance.