Cost of poor quality: how to calculate it and why your CFO should care
COPQ is typically 5–25% of revenue and almost never measured. Here's how to calculate it credibly, present it to finance, and turn it into a budget for improvement.
Ask a CFO what poor quality costs the business and you will usually get a vague answer or a number based on warranty reserves. The reality is much larger — and once it is on a slide in finance's own format, the conversation about quality investment changes overnight.
What COPQ actually includes
Internal failure costs
- Scrap and rework
- Re-inspection and re-test
- Downgraded product sold at lower margin
- Engineering time spent on fixes instead of new products
External failure costs
- Warranty and field service
- Returns and refunds
- Customer credits and concessions
- Lost customers (the largest and least-tracked category)
- Regulatory fines and legal exposure
Appraisal costs
- Incoming, in-process, and final inspection
- Calibration and equipment qualification
- Supplier audits and PPAP reviews
Prevention costs
- Training, process design, FMEA, the QMS itself
A practical method to calculate it
You do not need a perfect number. You need a defensible one. Pull twelve months of data from finance for warranty, scrap, and concessions. Add an estimate for engineering time spent on quality issues (10–20% is typical). Add a conservative lost-customer figure. Compare to revenue.
For most manufacturers the result lands between 5% and 25% of revenue. For service businesses it is harder to pin down but often higher, because rework is hidden as "normal work."
Why your CFO will engage
Once COPQ is expressed as a percentage of revenue, every quality improvement becomes an investment with a return, not a cost. A €2M COPQ on a €40M business that can be cut in half by better process control is a five-fold return on a modest QMS investment. That is a language finance speaks fluently.
“If you cannot say what poor quality costs you, you cannot defend the budget to fix it. COPQ is the bridge between the quality team and the boardroom.”