MRO is the largest unmanaged cost category at most mid-market manufacturers. BCG reports it accounts for 0.5 to 4.5 percent of revenues. For a $75 million manufacturer: $375,000 to $3.4 million annually. BCG also reports optimization yields 10 to 15 percent cost reduction. That is $200,000 to $300,000 in margin improvement on $2 million of MRO spend.
The Four Drift Patterns
Rate drift on emergency work. Contracts specify $85 standard, $110 after-hours. Vendor bills $135 — their default emergency rate, not the contracted rate. Over 12 months: $20,000 to $50,000 per vendor in rate drift on emergency calls alone. NTE cap overruns. Contracts cap spend at $45,000 per quarter. AP processes each invoice individually without tracking cumulative total. The cap quietly becomes $52,000 because nobody tracks the running total against the contract limit. Material markup escalation. Contract caps markup at 20 percent. Vendor’s standard gradually migrates to 28 or 32 percent. Invoice shows “parts: $1,240.” Nobody calculates implied markup against contracted ceiling. Unauthorized scope expansion. Technician dispatched for preventive maintenance notices adjacent wear. Addresses it. Invoice includes extra hours and materials. No change order. AP approves within tolerance. A $70 million manufacturer found $89,000 in annualized unauthorized scope across two years — 34 percent of invoices had at least one out-of-scope line item. Zero AP flags.
Why MRO Is Structurally Hard to Control
Operational urgency drives decisions. Verbal approvals are the norm. Technical billing complexity creates opacity. When equipment fails on the production floor, the question is not “does this comply with our contract?” — it is “how fast can they get here?” The financial control conversation happens weeks later when the invoice arrives. By then, the work is done, the line is running, and the invoice looks like a reasonable cost for an urgent repair. Nobody opens the contract to compare rates or check scope boundaries.
The Diagnostic Approach
Extract rate schedules, NTE caps, markup ceilings, and SOW from each active maintenance contract. Compare 90 days of invoices line by line. Flag variances. Takes 1 to 2 weeks for the MRO category. Findings of $80,000 to $250,000 in annualized drift are common for $1 to $3 million MRO spend. The operational culture does not need to change. Technicians can continue making urgent field decisions. The fix is financial, not operational: validate billing against contracts before paying, catch the drift that urgency creates, and correct it before it compounds for 24 months undetected.
Questions & Answers
How much do manufacturers spend on MRO?
BCG: 0.5-4.5% of revenue. For a $75M manufacturer: $375K-$3.4M. Optimization yields 10-15% through better contract compliance.
What are the main MRO drift patterns?
Four: rate drift on emergency work, NTE cap overruns, material markup escalation, unauthorized scope expansion. All invisible to standard AP controls.
Why is MRO harder to control?
Urgency drives decisions ahead of controls. Verbal approvals, field-level scope decisions, technical billing complexity. The priority is uptime, not compliance.
What are typical MRO findings?
$80K-$250K annualized for $1-3M spend. Most frequent: unauthorized scope (34% of invoices) and rate drift on emergency work.
Can MRO drift be prevented without changing operations?
Yes. The fix is financial — compare invoices against contracts before payment. Operations continues making urgent decisions. Finance validates billing afterward.