# Margin Drift in Services Spend: A Practitioner Study

> Evidence from 20 Finance Forum Discussions and Industry Data

Source: https://valuexpa.com/publication/margin-drift-practitioner-study
Publisher: ValueXPA (https://valuexpa.com)

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## Executive summary

Service vendor spend leaks 1–3% annually in most mid-market companies — not through fraud, but through a structural gap between ERP AP controls and vendor contract terms. This report analyses evidence from 20 finance professional forum discussions and cross-references benchmarks from APQC, AFP, and ERP vendor disclosures to identify the six categories where leakage concentrates and the AP automation patterns that fail to catch it.

## Key findings

1. 1–3% of service vendor spend leaks annually across all six leakage categories
2. Freight billing errors are the highest-frequency category — identified in 14 of 20 forum threads
3. ERP AP modules validate invoice-to-PO accuracy, not PO-to-contract accuracy — the gap is structural
4. Contract labour off-rate billing is the highest-value category by recoverable dollar amount
5. Businesses that cross-reference vendor contracts against AP data in periodic audits recover 60–80% of identified leakage

## Who this is for

CFOs, controllers, and AP managers at $20M–$200M manufacturers, distributors, and B2B services businesses

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ValueXPA runs a fixed-scope Margin Drift Diagnostic that validates every service vendor invoice against contract terms, for $100M+ US industrial manufacturers and distributors. Two to four weeks. The client retains 100% of recoveries. https://valuexpa.com/contact-us