4.3 E&o prevention & disposition rules
Excess and Obsolete (E&O) inventory is financial cancer. It occupies warehouse space, consumes working capital, and eventually requires a write-down that destroys net profit. E&O is rarely a surprise; it is the mathematical result of poor synchronization between the Demand Signal (Forecast) and the Supply Execution (Purchasing).
E&O management is treated not as “cleanup,” but as a standard continuous control loop.
Prevention logic (the firewall)
Section titled “Prevention logic (the firewall)”The best way to manage E&O is to refuse to create it. Strict filters are applied at the purchasing stage to block “toxic” inventory from entering the ERP.
Prevention filter 1: the MOQ trap
Section titled “Prevention filter 1: the MOQ trap”- Situation: A customer order quantity is significantly lower than a specific component’s MOQ (
Minimum Order Quantity ). - Action: Halt the PO process.
- Resolution: The customer must approve the financial liability for the excess units prior to the factory placing the component PO.
- Output: A signed “MOQ Liability Authorization” document.
Prevention filter 2: the ECO filter
Section titled “Prevention filter 2: the ECO filter”- Situation: Engineering releases a new BOM revision.
- Action: Purchasing immediately halts all active orders for unique parts tied exclusively to the previous revision.
- Resolution: Perform a “Where-Used” analysis. Parts that cannot be utilized in other assemblies must be flagged as “Stranded” inventory immediately to make the commercial impact visible.
Prevention filter 3: the NCNR check
Section titled “Prevention filter 3: the NCNR check”- Situation: The factory needs to procure custom components with extended lead times.
- Action: Verify that Forecast Zone 1 & 2 volumes cover the intended purchase quantity.
- Resolution: Forecasts falling short of the Purchase Quantity require a written NCNR (
Non-Cancellable Non-Returnable ) acknowledgement from the customer to cover the gap.
The E&O trigger matrix
Section titled “The E&O trigger matrix”Inventory health is classified into four distinct states based on “Days of Supply” (DoS). Math must be used instead of relying on “gut feel”.
| Status | Definition | Trigger / Threshold | Action |
|---|---|---|---|
| Active | Healthy stock rotating with demand. | ≤ 90 Days Supply | Standard |
| Slow Moving | Demand exists, but velocity has slowed. | 91 – 180 Days Supply | Stop Buys. Flag for “Burn Down” plan. |
| Excess | Good parts, but quantity exceeds 12-month forecast. | Inventory > 12 Month Forecast | Notify Customer. Request liability acknowledgement. |
| Obsolete | Part removed from BOM or EOL; Zero demand. | 0 Forecast; 0 Usage in 6 mo. | Disposition. Initiate scrap or ship-to-customer. |
Pro-Tip: “Just in Case” inventory is often disguised as “Strategic Buffer.” If the customer wants a buffer, they must pay for the holding cost. If they won’t pay, it’s not strategic; it’s E&O.
The disposition workflow
Section titled “The disposition workflow”When inventory triggers the “Obsolete” or “Excess” state, this workflow must be executed immediately. Delaying disposition only increases the carrying cost.
Step 1: The quarterly audit (detection)
Section titled “Step 1: The quarterly audit (detection)”- Frequency: Every 90 days (aligned with QBR).
- Output: Report listing all items > 180 days age with value > $100.
Step 2: the notification (commercial)
Section titled “Step 2: the notification (commercial)”- Send the E&O Liability Report to the customer.
- SLA: Customer has 10 business days to review and dispute.
- Default: Silence = Acceptance of liability.
Step 3: the decision (disposition)
Section titled “Step 3: the decision (disposition)”One of the four paths below must be selected.
Option A: Ship to Customer
- Action: Ship the parts to the customer’s facility.
- Cost: Customer pays shipping + value of material.
- Best For: High-value custom parts (e.g. Enclosures, PCBs) that the customer might use elsewhere.
Option B: Buy-Back / Return
- Action: Return to the original distributor/vendor.
- Cost: Restocking fee (typically 15% – 25%). Customer pays the fee.
- Best For: Standard commodities (ICs, Passives) within 1 year of purchase.
Option C: Fire Sale (Broker)
- Action: Sell to an independent broker.
- Cost: Recovery is typically 5% – 10% of book value. Customer pays the remaining delta.
- Best For: Generic silicon where market demand exists.
Option D: Scrap (Certificate of Destruction)
- Action: Physical destruction of the material.
- Cost: Customer pays book value. Factory absorbs disposal cost.
- Best For: Custom PCBs, proprietary IP, or hazardous materials.
Financial controls & approvals
Section titled “Financial controls & approvals”Writing off inventory impacts the P&L (Profit & Loss). Strict authority levels are required to prevent fraud or unauthorized margin erosion.
Write-Off Authority Matrix:
| Value of E&O | Approver Required |
|---|---|
| < $1,000 | Project Manager |
| $1,000 – $10,000 | Operations Manager |
| $10,000 – $50,000 | Plant Director |
| > $50,000 | VP Finance / CFO |
The “COD” rule
Section titled “The “COD” rule”Assets must never be removed from the balance sheet without a Certificate of Destruction (COD).
- The COD must include:
Part Number , Quantity, Date, Method of Destruction, and Photo Evidence. - Without a COD, the write-off is an audit risk.
Final Checkout: E&O prevention & disposition rules
Section titled “Final Checkout: E&O prevention & disposition rules”| Control Point | Passing Criteria | State |
|---|---|---|
| ERP Ageing Report | Automated report runs weekly, filtering stock > 180 days. | Active |
| Liability Clause | Contract specifies customer pays for custom material | Signed |
| Scrap Vendor | Certified e-waste disposal partner identified (ISO 14001). | Active |
| Last Time Buy (LTB) | Process exists to catch Vendor EOL notices before parts go obsolete. | Defined |
| E&O Invoice | Accounting has a specific code for billing E&O liability. | Defined |