What is your tail spend really costing you?

Tail spend is the long tail of low-value purchases that typically accounts for 15-25% of total procurement volume but involves 80% of vendors. McKinsey & Company identifies tail spend as 10-20% of total spend across most industries. A Hackett Group / Fairmarkit (2023) survey of 200+ procurement leaders found tail spend averages 20% of addressable spend. BCG (Boston Consulting Group) reports tail spend at 15-25% of total procurement budgets in large enterprises. The 80% vendor share follows the well-documented Pareto distribution — confirmed by Candex and Corcentric data showing that the vast majority of supplier relationships are low-frequency, low-value tail vendors. The number of purchase orders is derived by dividing tail spend by the average order size.

Every new tail vendor must be set up in the ERP/P2P system: background and compliance checks, bank account verification, tax documentation, contract templates, system master data entry, and internal approval workflows. Our default of CHF 850 per vendor is a mid-range estimate grounded in multiple industry benchmarks. The Hackett Group reports vendor onboarding costs of $700-$1,400 per supplier depending on complexity. Vroozi (2024) cites $500-$2,500 per vendor across a range of industries. Harvard Business Review and Veridion research places supplier onboarding at $700-$1,000 for standard indirect suppliers. Compliance-heavy sectors (pharma, regulated industries) can exceed CHF 2,000 per vendor. We apply this cost only to the tail-vendor share of new vendors per year (default 80% of new vendors are tail vendors, based on the Pareto distribution confirmed by Hackett/Fairmarkit and Candex data).

Every active vendor in your system incurs ongoing costs: master data maintenance (address changes, banking details, contact updates), compliance renewals and spot-checks, document tracking (certificates, insurance, tax forms), contract renewals, and system record upkeep. Gartner/AMR Research reports organisations spend up to $1,000 per supplier per year on supplier information management. Auditec Solutions estimates vendor master data maintenance alone at $585-$1,000/year per supplier. Our default of CHF 200/vendor/year is deliberately conservative — it reflects tail vendors only, which are low-touch records that don't receive quarterly business reviews, dedicated relationship management, or strategic performance monitoring like top-tier suppliers do.

Not all purchase orders cost the same to process. We split PO processing into two channels that reflect how organisations actually buy. Catalog purchases go through an e-catalog or punch-out system — the user selects, clicks, and the order routes for automated approval. Manual purchases require the full human process: sourcing, supplier selection, negotiation, requisition creation, multi-level approval chains, goods receipt, three-way invoice matching, and payment processing. Maverick purchases (off-contract) are processed at manual cost because they lack pre-negotiated terms and require additional verification. APQC (2024) reports fully automated P2P costs $5-10 per transaction, while median cost per PO across all maturity levels ranges from $50 to $500+. The APECA/Manutan (2023) European benchmark found dematerialised e-catalog orders cost EUR 25 and manual orders cost EUR 95. CAPS Research / ISM benchmarks place the average cost per PO at $35-$506 depending on process maturity and automation. Our default catalog share of 50% aligns with Ardent Partners data showing 44-57% of indirect purchases flow through e-catalogs in mature procurement organisations, and Coupa benchmarks reporting similar adoption rates. Our defaults of CHF 60 (catalog) and CHF 225 (manual) sit in the middle of these ranges, reflecting Swiss cost levels and the complexity typical of tail-spend purchases.

When employees buy off-contract, they pay more — because there are no pre-negotiated rates, no volume discounts, and no competitive bidding. This is the price premium on top of what the organisation would have paid through proper channels. Accenture research finds a 12-18% price premium on every off-contract purchase. The Hackett Group reports 10-20% cost increases from maverick purchasing across indirect categories. CIPS (Chartered Institute of Procurement & Supply) benchmarks corroborate a 10-15% average price premium on unmanaged spend. Ardent Partners (2024) reports only 59.5% of spend is contract-compliant — meaning 40.5% is off-contract. The Hackett Group puts indirect off-contract spend at 29%. Our defaults are conservative: 10% of tail spend is off-contract (vs. 29-40% industry average) and 12% price premium (vs. 10-20% range from multiple sources). Note: the processing cost of maverick POs is already included in PO processing above — this line captures only the overpayment.

Vemente acts as a single pre-approved master vendor that handles your manual and maverick tail-spend purchases end-to-end. Your catalog purchases are unaffected — they continue through your existing e-catalog at the same cost. For everything else, Vemente replaces the full manual process: your team submits a request, Vemente handles sourcing, ordering, goods receipt, invoicing, and payment to the end supplier. You receive one consolidated invoice from one vendor.