Cost of Poor Quality
Definition
Cost of Poor Quality
Cost of poor quality is the total money a business loses because work has to be checked, fixed, redone, or refunded. It is the price of defects, counted in cash rather than complaints, and it usually dwarfs the budget spent on prevention.
The idea comes from quality management, not accounting. Most of these costs never appear as a line item, because they hide inside rework hours, credit notes, and repeat contacts.
That invisibility is the point. Naming the number is what turns quality from a soft argument into a budget conversation finance will actually engage with.
Key takeaways
- Cost of poor quality captures every cost that exists only because work was done wrong.
- Failure costs split into internal, found before the customer sees them, and external, found after.
- External failures cost far more than internal ones, so detection timing drives the total.
- Prevention spend is the cheapest line in the model and usually the smallest.
How it works
Cost of poor quality sits inside the wider cost-of-quality model — which splits spending into four categories. Two are money spent to get quality right, and two are money lost because it went wrong.
The American Society for Quality defines cost of poor quality as the costs associated with providing poor quality products or services — see ASQ’s cost of quality resource.
That same source splits the model into prevention costs, appraisal costs, internal failure costs, and external failure costs.
| Category | What it covers | Direction |
|---|---|---|
| Prevention | Training, process design, quality systems | Investment |
| Appraisal | Inspection, monitoring, audits | Investment |
| Internal failure | Rework and scrap found before delivery | Loss |
| External failure | Complaints, credits, recalls, churn | Loss |
Internal failure costs are those tied to defects found before the customer receives the product or service. External failure costs are tied to defects found after they receive it.
That distinction carries the whole economics. A misconfigured order caught in checking costs minutes, while the same order caught by the customer costs a credit note plus a lost renewal.
In service operations the biggest external failure cost is the repeat contact. Every issue that fails first contact resolution generates another paid interaction and a worse customer.
Detection improves through call quality monitoring, but monitoring is an appraisal cost. Spending more there without fixing root causes just prices the problem more accurately.
Building the number is a costing exercise, not a survey. Count rework hours, credits issued, repeat contacts, escalations, and lost accounts, then attach a real hourly or unit cost to each.
Excellence frameworks push the same logic upward. The U.S. National Institute of Standards and Technology publishes the Baldrige Excellence Framework, whose 2026 revision is now available after nearly 40 years of use.
The classic pattern is a heavy appraisal budget beside a token prevention budget. Shifting spend upstream lowers the total even when the quality budget itself does not change.
Report the figure as a percentage of revenue or of operating cost. A single absolute number invites argument, while a ratio tracked quarterly invites action.
Watch the trend rather than the level. Measurement methods differ so widely between businesses that cross-company comparison is close to meaningless.
Examples
Cost of poor quality shows up in different currencies by sector, and the biggest cost is almost always the one furthest downstream. Five cases show where the money actually goes.
Manufacturers count it in scrap and warranty. A defect caught on the line costs the part, while the same defect caught in the field costs the part, the visit, and the relationship.
Contact centers count it in repeat contacts. A 10% failure rate on first-contact resolution means one in ten interactions is paid for twice, before any goodwill credit is issued.
Finance and accounting teams count it in reconciliation. Every invoice keyed wrong triggers a query, a correction, and often a delayed payment — three costs from one avoidable error.
Healthcare revenue operations count it in denials. A claim denied for a coding error is reworked, resubmitted, and paid weeks late, and some denials are never recovered at all.
Software teams count it in escalations. A bug reaching production consumes support time, engineering time, and release capacity — which is why prevention spend concentrates on testing.
Related terms
Cost of poor quality connects quality practice to financial reporting. The terms below cover the improvement methods that reduce it, the monitoring that detects it, and the cost concepts it feeds into.
- Quality Assurance: the function that designs and runs the checks defect costs are measured against.
- Six Sigma: the improvement methodology built around reducing process variation and defects.
- Call Quality Monitoring: the appraisal activity that finds service defects before customers do.
- First Contact Resolution: the outcome metric that most directly reduces repeat-contact failure cost.
- Business Process Improvement: the discipline of removing the root causes behind failure costs.
- Total Cost: the full cost base that poor quality is reported as a share of.
- Efficiency Metrics: the operational measures that move when failure costs fall.
FAQ
What is the difference between cost of quality and cost of poor quality?
Cost of quality covers all four categories, including prevention and appraisal investment. Cost of poor quality covers only the two failure categories.
How do you actually calculate it?
Count rework hours, credits, repeat contacts, escalations, and lost accounts for a period, then attach a real unit cost to each and total them.
Why is external failure more expensive than internal?
Because the customer has already been affected, so the cost includes remediation, goodwill, and the risk of losing the account.
What is a typical figure?
Published estimates vary too widely to be useful as a benchmark, which is why the trend inside one business matters more than the level.
Which category should get more budget?
Prevention, almost always, because it removes failure cost rather than measuring it.
Does the model apply to services?
Yes, with rework counted as repeat contacts and scrap counted as abandoned or reissued work.
Source partners building a costed quality case can compare delivery models across Outsource Accelerator hubs.
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