What do customer quality complaints cost you?

A customer quality complaint costs far more than the bad parts. Each incident brings sorting of every suspect piece, a line-stop chargeback, an incident fee and often a debit note. With 40,000 parts a month at ₹45, 150 PPM at the customer and 4 complaints a year, each costing ₹30,000 of sorting, a ₹30,000 line-stop charge, a ₹25,000 fee and a 1% debit note, that is about ₹1.03 lakh per incident, ₹34,333 a month or ₹4.12 lakh a year: roughly ₹5,700 for every bad part that reached the customer. The supplier manuals cited below set no "safe" PPM: one bad part found at the customer is enough to open a complaint.

How the calculator works

The calculator takes nine inputs:

• Parts shipped a month. Deliveries of this part to this customer.
• Price per part (₹). Your invoice price. It sets the value of a month's supply, which the debit note is based on.
• Defective PPM at the customer. Defective parts per million delivered, as the customer counts it on your scorecard. The calculator turns it into bad parts a month: parts shipped × PPM ÷ 1,000,000.
• Complaints (incidents) a year. Each formal complaint, quality reject or concern note the customer raised. Your 8D register is the best source.
• Suspect parts sorted per incident. Not the bad parts, but every part the customer treats as suspect: stock at its plant, in transit and in your store. This is usually the biggest number in the calculation.
• Sorting cost per part (₹). What a third-party sorting agency charges, divided by the parts it sorts. If the agency quotes per sorter-hour, divide the hourly rate by the pieces a sorter checks in an hour.
• Line-stop chargeback per incident (₹). What the customer debits for stopping or slowing its line, if your contract allows it.
• Incident / administration fee (₹). A flat fee some customers charge per complaint.
• Debit note per incident (% of a month's supply value). If your customer debits a percentage, enter it here; if it debits only actual costs, enter 0.

The formulas:

Bad parts a month = parts shipped × PPM ÷ 1,000,000
Sorting per incident = suspect parts × sorting cost per part
Debit note per incident = parts shipped × price × debit-note %
Cost per incident = sorting + line-stop chargeback + incident fee + debit note
Cost a year = cost per incident × incidents a year; cost a month = cost a year ÷ 12
Cost per bad part delivered = cost a year ÷ (bad parts a month × 12)

The calculator also shows the yearly cost as a share of this part's yearly sales.

When does a customer escalate?

The supplier manuals we read set no tolerated PPM. They escalate on the first defect found:

• Tenneco India states that its policy is to supply defect-free products to its customers, "i.e. 'zero ppm'", and that it "will charge costs related to the nonconformance (sorting, rework, administration etc.) to the supplier" (Tenneco India supplier manual, section C.3).
• Varroc Lighting Systems raises a Quality Reject on "one or several non-conform components" and asks the supplier to sort all suspected parts "at any defined location", including the customer's plant and parts in transit, at the supplier's expense. Its fee schedule charges a fixed €300 when failed serial parts are found at Varroc, €600 when they are found at Varroc's customer and €1,000 when the root cause recurs, plus, "according to real cost", sorting, premium freight and "customer production line stoppages: all costs, including customer full rate invoices" (Varroc Lighting Systems supplier quality manual, VM-SCM-417, section 3.7–3.8 and Appendix 2).
• MANN+HUMMEL describes the next step, controlled shipping: at CSL 1 you add a 100% inspection by staff independent of the production line, in a dedicated area off the line; at CSL 2 you must "authorize a third party company" approved by MANN+HUMMEL. Exit needs, among other things, no recurrence for "1 month or 3 production batches" after corrective actions (MANN+HUMMEL CSL1/CSL2 instructions).

So the useful question is not "at what PPM will they escalate?" but "how many bad parts a month reach them?" At 150 PPM on 40,000 parts that is 6 a month, and each one can open an incident. Your own customer's PPM target and escalation rules are in its supplier manual and scorecard; read those line by line.

Worked example (India)

A Pune-area press-and-machining unit supplies a steel bracket to a Tier-1. All figures are assumptions for illustration, not quotes from any customer or sorting agency; they are the calculator's default inputs.

The 72 bad brackets a year are worth ₹3,240 at the invoice price. The complaints they cause cost about 127 times that.

Two inputs move the result most. Suspect parts sorted: if the supplier can prove when the problem started and stopped, the customer may sort one shift's output instead of weeks of stock; at 3,000 suspect parts, sorting per incident falls from ₹30,000 to ₹3,000 and the yearly total to ₹3.04 lakh. Incidents a year: each one avoided saves ₹1.03 lakh here.

Left out: controlled shipping (CS1 or CS2), premium freight for replacement lots, your engineers' 8D time, scrapped customer assemblies, warranty and recall costs, and the hit to your supplier rating. Any one of them can exceed the table. Our article on what one PPM escalation costs an Indian auto-component supplier prices a single incident with a month of CS1 and CS2.

What this number does not tell you

• Your in-house rejection cost. Parts caught before dispatch cost rework and scrap, not escalations. Use the rework and scrap cost calculator for that side; what a 3% rejection rate costs an Indian CNC shop explains the steady-state bill.
• The business at risk. A poor scorecard can lead to a new-business hold. Tenneco India's manual says that failure to meet its expectations "may lead to new-business hold or further actions".
• Why the parts were bad. That comes from gauges, poka-yoke and your 8D.
• What a camera cannot see. A shop-floor camera does not detect a missing thread, a burr or an out-of-tolerance dimension. It can show when a machine stopped, when a tool was changed, whether a first-off check happened and when a lot left the gate, which is the evidence that narrows the suspect window. See waiting for first-piece approval and cameras for OEM and IATF audits.

Related guides

• One Customer Complaint, ₹2–5 Lakh: What a PPM Escalation Costs an Indian Auto-Component Supplier
• What a 3% Rejection Rate Really Costs an Indian CNC Shop (₹)
• Cameras for Auto-Component Plants: Passing OEM & IATF Audits (India)
• Catching Quality Problems on the Line with Cameras
• Rework and scrap cost calculator
• Changeover time cost calculator

FAQ

How do I calculate the cost of customer PPM complaints? Add up, per incident: suspect parts × sorting cost per part, the line-stop chargeback, the incident fee and any debit note. Multiply by incidents a year. With the default inputs that is ₹1,03,000 per incident and ₹4.12 lakh a year.

At what PPM does a customer escalate? The published manuals we read set no tolerated level. Tenneco India's quality policy is "zero ppm", and Varroc Lighting Systems raises a Quality Reject on one or several non-conforming parts. Your customer's own target is in its supplier manual and scorecard.

What does third-party sorting cost per part? It depends on the agency, the check and the location. Divide the agency's hourly rate per sorter by the pieces a sorter checks in an hour: at an assumed ₹300 an hour and 300 pieces an hour, that is ₹1 a part. Add any mobilisation charge.

How can I cut the sorting bill? Prove the suspect window. Lot labels with machine, shift and times, recorded first-off and patrol checks, and correctly timed video can cut the suspect quantity from weeks of stock to a single shift.

Mama reads a factory's existing cameras and each morning tells the owner where machine and line hours went the day before: stops, restarts, unstaffed inspection tables, lots waiting at dispatch. Mama does not inspect parts. Mama can draw a camera plan for the tool-change, inspection and dispatch points where a suspect window leaves a time-stamped trace. Leave an email or phone in the form below.