4.1 Indirect spend taxonomy & ownership

Indirect spend—items that do not go into the finished shipped product—can significantly impact factory profitability if left unmanaged. While Direct Material (BOM) pricing is closely scrutinized, Indirect Spend (MRO, Tools, Services) can quietly accumulate. Without a clear corporate taxonomy, Procurement can become overwhelmed with ad-hoc requests rather than focusing on negotiating strategic volume contracts.

The spend taxonomy

Categorizing indirect spend is essential for assigning the correct ERP approval routing logic. Every Purchase Requisition (PR) should explicitly reference a defined category to ensure proper tracking and approval.

MRO (maintenance, repair, operations)

• The Scope: Critical spare machine parts (e.g. SMT feeders, drive belts), industrial lubricants, under-stencil wipes, PPE (cleanroom gloves, masks).
• The Nature: Highly Consumable. Rapidly Recurring.
• The Owner: Maintenance Manager / Manufacturing Operations Director.

Tools & fixtures (durable assets)

• The Scope: Precision hand tools, ESD floor mats, inspection microscopes, active soldering irons, custom ICT test jigs.
• The Nature: Durable (Asset Life typically > 1 year) but relatively Low Value (e.g. < $$$2,500). Requires physical tracking but may not require formal financial depreciation.
• The Owner: Process Engineering Lead.

Calibration & external services

• The Scope: Specialized metrology labs, external ISO/IATF auditors, OEM equipment repair contractors, facility services.
• The Nature: Intangible, often highly specialized operational outcomes.
• The Owner: Quality Manager / Plant Facilities Manager.

Packaging (non-BOM freight)

• The Scope: Bulk master shipping cartons, structural packing tape, heavy-duty bubble wrap, wooden pallets. (Distinct from retail “Product Packaging,” which is a Direct BOM cost).
• The Nature: A variable financial cost linked to output shipment volume.
• The Owner: Logistics Manager.

IT hardware & SaaS licensing

• The Scope: Employee laptops, local servers, wireless barcode scanners, SaaS subscriptions (Jira, CAD licenses).
• The Nature: Digital Asset or Cloud Subscription. Represents organizational and cybersecurity considerations.
• The Owner: IT Director (Holds mandatory technical review authority).

CAPEX-lite (small capital expenditures)

• The Scope: Small operational equipment (e.g. $$$2,500 – $$$10,000), such as a BGA rework station or a stencil cleaner.
• The Nature: Financial Capital Asset. Requires a formal ROI justification but typically follows a faster approval path than major CapEx.
• The Owner: Site Operations Director.

Ownership & approval matrix

Define the hierarchical “Delegation of Authority” (DoA) within the ERP to balance administrative efficiency with financial control.

Spend Bucket	Value Threshold	Budget Approver	Execution (The Buyer)	Mandatory PR Evidence
MRO / Spares	< $$$500	Production Shift Lead	Indirect Buyer	Machine ID, Mfr Part #
MRO / Spares	> $$$500	Maintenance Manager	Senior Buyer	Vendor Quote, Last Price Paid
Tools/Fixtures	Any Value	Engineering Manager	Indirect Buyer	Justification (e.g. New NPI)
IT / Software	Any Value	Global IT Director	IT Procurement Dept	Helpdesk Ticket #, Spec Match
Services/Cal	Annual Contract	Plant General Manager	Commodity Manager	Signed Statement of Work (SOW)
CAPEX-Lite	> $$$2,500	VP Ops + Plant Controller	Senior Buyer	ROI Calculation / Asset Request
Emergency	Any Value	Plant General Manager	Any Available Buyer	Formal “Line Down” Jira Ticket

Purchasing guidelines

Establishing clear rules helps transition from ad-hoc buying to strategic procurement.

1. Structured Sourcing over Retail: Avoid using standard consumer retail accounts for industrial supplies whenever possible.
   • The Rationale: Retail purchases often lack ERP invoice traceability, complicate tax exemption tracking, and make RMA processes difficult.
   • The Exception: Urgent “Line Down” spot buys, typically executed with a controlled corporate P-Card.
2. Centralized IT Spend: Engineering and Operations should not purchase software or IT hardware outside of IT channels.
   • The Rationale: Ensures cybersecurity compliance, proper licensing, and standardized support.
3. Specific PR Descriptions: A PR needs clear, actionable data. Requests like “Lab supplies” should be returned for clarification.
   • The Requirement: Provide an explicit Manufacturer Part Number (MPN), a vendor link, or a formal Quote.

Mandatory evidence for purchasing

Procurement functions best when provided with clear, complete requirements from the requesting team.

When Requesting MRO / Tooling:

• Provide the exact Mfr Part Number, a suggested supplier, and the required Dock Date.

When Requesting a Service / Calibration:

• Provide a formal Scope of Work (SOW), technical contact details, and the scheduled dates of service.

When Requesting CAPEX-Lite:

• Provide an Asset Tag Request Form and an ROI brief (e.g. estimated labor hours saved per week).

Final Checkout: Indirect spend taxonomy & ownership

Control Point	Engineering Requirement	Target Goal
Taxonomy Tag	Every PR is categorized accurately in the ERP.	System enforced
IT Review	IT Hardware PRs are routed to IT for approval.	Maintained
DoA Logic	Approval Thresholds are managed by the ERP.	Automated routing
Quote Policy	Competitive bids are collected for higher values.	E.g. over $$$5,000
Asset Tagging	CAPEX-Lite items are tagged upon arrival.	Tracked consistently
Data Quality	PRs with insufficient data are returned for rework.	Checked by Buyers