Spend under management (SUM)
Spend under management (SUM) is the percentage of an organization's total external spend that procurement actively influences through sourcing, negotiated contracts, or managed buying channels. It is calculated as managed spend divided by total addressable spend, and definitions vary: some teams count any spend on contract, while stricter versions require procurement involvement before the commitment is made.
Examples
Calculating it: Total external spend is $120 million. Excluding $18 million of taxes and intercompany charges leaves $102 million addressable, of which procurement sourced or contracted $61 million. SUM is 60%, not the 51% the unadjusted denominator would suggest, and the definition memo states both numbers.
Channel work moves the number: Lab supplies run $2.4 million a year across 240 card transactions a month, none managed. After contracting two distributors and routing orders through a catalog, $2.1 million qualifies as channeled spend within two quarters, lifting company-wide SUM by two points and giving the broader spend management program its first visible win.
Definition
Procurement can only influence the spend it actually touches, and SUM is the number that says how much that is. A team negotiating brilliantly while covering 40% of spend is leaving the other 60% to whoever signs fastest, which is why SUM sits next to savings on most procurement KPI scorecards as the coverage metric.
The definition is where the games live. The numerator question is what 'managed' means: competitively sourced, under an active contract, or merely routed through an approved channel. The denominator question is what counts as addressable: total external spend usually excludes payroll, taxes, and intercompany transfers, and some teams quietly drop categories they cannot influence. Two companies both reporting 85% can be describing different realities. The honest version reports tiers (sourced, contracted, channeled) against a denominator built from an actual spend analysis rather than an assumption.
What sits outside SUM is, by definition, maverick spend and unmanaged tail spend. Raising the number is mostly channel work (catalogs, intake forms, contract coverage) rather than negotiation heroics. And 100% is the wrong target: pushing a $600 one-off purchase through full sourcing costs more than it saves, so weight the coverage effort by value and risk.
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