What is tail spend management?

What does tail spend management mean?

Tail spend management is the set of policies, buying channels and tools an organisation uses to control its tail spend: the many low-value purchases from suppliers that procurement does not manage through a category strategy or a contract. Its aim is to make those purchases cheap to process, compliant and visible, without spending a buyer’s time on each one.

Tail spend itself is defined by who manages it as much as by a number. The glossary of the Chartered Institute of Procurement & Supply (CIPS) describes it as the bottom 20% of an organisation’s spend, which usually accounts for 80% of its suppliers: low-value, one-off purchases that may not be under the control of the procurement team or under contract. The name comes from the shape of a chart of suppliers ranked by spend: a few large suppliers on the left, then a long, thin tail of small ones. A dedicated guide to what tail spend is, with its types, is in preparation.

Public procurement uses the same idea under other names. In the US federal government, OMB memorandum M-19-13 sorts common spending into tiers of spend under management, from tier 0, spend not aligned to any managed contract solution, to tier 3, Best In Class contracts. Tail spend sits mostly in the unmanaged tier: bought locally, from many suppliers, without a strategy.

Why does tail spend need managing?

Tail spend needs managing because its cost is hidden in the process, not in the price. Each small supplier has to be onboarded, checked, ordered from, invoiced and paid like a large one, so a tail of hundreds of suppliers can take a large share of the work of procurement and accounts payable for a small share of the money.

• Process cost: supplier records, purchase orders, invoices and payments for suppliers that are used once or twice a year.
• Price: without a contract or a comparison, small purchases are made at list price, and the same item is bought at different prices across sites.
• Risk: suppliers that skip onboarding may not be screened for sanctions, insurance or bank details, and a one-off supplier is a common target for invoice fraud.
• Visibility: tail purchases are spread across many general ledger accounts and descriptions, so they are the hardest part of a spend analysis to classify.
• Fragmentation: needs that look small in each department can add up to a category worth a contract once they are grouped.

The 20/80 split in the CIPS definition is the Pareto principle applied to suppliers: a few take most of the spend, and many share the rest. It is a rule of thumb, not a measurement: the split differs from one organisation to another, and published “benchmarks” rarely state their sample, so measure your own shape before setting targets.

How do you define your tail spend?

You define your tail spend with a written rule applied to your own spend data, so that the tail can be measured the same way every year. The rule starts from the supplier ranking that a spend analysis produces, after supplier names have been normalised to one parent per company.

By supplier value

Every supplier with annual spend below a fixed amount is in the tail. Simple to explain and to recalculate; the amount is a choice, set to the size of the organisation.

By cumulative spend

Suppliers are ranked by spend, and those after the point where a chosen share of total spend is reached form the tail. It adapts to the organisation’s size but moves when the large suppliers change.

By management

Spend in a category with no owner, strategy or contract is in the tail, whatever its size. Closest to the spend under management tiers used in US federal buying.

By transaction

Purchases below a value per order, wherever they occur. Useful for setting buying channels, such as a purchasing card limit, rather than for counting suppliers.

Most organisations combine two rules: a value rule to size the tail, and a management rule to find categories hidden inside it. Whichever you choose, keep the definition stable from one year to the next, or progress on the tail cannot be shown.

Read the example as a method rather than a benchmark. The tail suppliers spend €4,500 each on average and send twelve invoices a year, an average invoice of €375. Multiply those invoices by your own cost to process an invoice and pay a supplier, and you have the process cost the tail carries; compare it with what a catalogue or a card would cost for the same purchases.

What is a tail spend management framework?

A tail spend management framework is the sequence that turns the tail from a list of suppliers into a set of buying channels. It sorts tail purchases by why they happen, assigns each kind of need one channel with its own controls, and measures whether purchases follow the channel.

1. Define the tail with a written rule and measure it: suppliers, spend, invoices and the categories involved, for the last twelve months.
2. Sort tail purchases by cause: one-off needs, recurring needs without a contract, purchases made off an existing contract, and urgent or specialist buys.
3. Assign a channel to each cause: a category contract, a catalogue or marketplace, a purchasing card, a quick competitive quote, or a preferred supplier list.
4. Set the rules of each channel: who may use it, value limits, which suppliers are allowed, and which checks a new supplier must pass before the first order.
5. Route requests through one entry point, an intake form or a guided buying screen, that sends each need to its channel without the requester having to know the policy.
6. Measure every quarter with the same definition: tail suppliers, new one-time suppliers, invoices, spend through each channel and spend moved into managed categories.

The quick quote channel follows the logic of a request for quotation: a few suppliers price the same specification and the buyer records the choice. The purchasing card channel has a public model in the US federal government, where FAR 13.201(b) makes the government-wide commercial purchase card the preferred method to buy and pay for micro-purchases, which may be awarded without competitive quotations when the price is considered reasonable.

Which strategies reduce the cost of tail spend?

The strategies that reduce the cost of tail spend either move purchases out of the tail or make the tail cheaper to run. Consolidation and category contracts move purchases out; catalogues, cards and automation make what stays cheaper. Most programmes use both, starting with the largest groups of similar purchases. A dedicated guide to reducing tail spend step by step is in preparation.

• Consolidate suppliers: where many tail suppliers sell the same thing, award the need to one or a few, and block the others for new orders once their open orders and invoices are settled.
• Make the right channel the easiest: a catalogue item or a card is quicker for the requester than finding a new supplier, so purchases follow.
• Control new suppliers: require a business reason before a one-time supplier is created, and offer the preferred list first.
• Outsource where it pays: some organisations hand the tail to a managed service or a marketplace provider that buys on their behalf under agreed rules.
• Automate quotes and negotiation for low-value buys, within limits set by procurement.

Organisations with very large supplier bases have started to automate negotiation itself. Harvard Business Review described in 2022 how Walmart, with more than 100,000 suppliers, automated negotiations with tail-end suppliers: around 20% of its suppliers had signed standard, often non-negotiated agreements, and hiring enough buyers to negotiate with each of them would have cost more than it returned.

How do you measure tail spend management?

You measure tail spend management with a few indicators recalculated each quarter on the same definition of the tail. Their direction matters more than their level, because no public benchmark compares organisations on a common definition.

Analytics on the tail, the dashboards that find these patterns automatically, will be covered by a dedicated guide to tail spend analytics, now in preparation.

What software supports tail spend management?

Tail spend management software processes low-value purchases with little or no buyer involvement and shows where they go. Gartner Peer Insights keeps a market category for tail spend solutions, described as tools that help process and fulfil spend on noncritical goods and services from vendors that procurement does not actively manage; its mandatory features are spend visibility, automation of steps such as requisition, purchasing and invoice payment, and analytics and reporting.

In practice the tools come from several directions: guided buying and catalogues in procure-to-pay software, purchasing and virtual card platforms, B2B marketplaces, automated sourcing tools that collect quotes, and intake tools that route each request to its channel. A dedicated guide to tail spend management systems and how to choose one is in preparation; the wider selection method is in the procurement software guide.

What are the current trends in tail spend management?

The main trend in tail spend management is automation of the work that buyers never had time to do. Products now listed under tail spend solutions on Gartner Peer Insights describe agents that read a requester’s need in plain language, find suppliers, issue a request for quotation and score the bids, alongside virtual payment cards issued per purchase and orchestration tools that combine intake, supplier onboarding and spend control.

• Agentic AI for sourcing and negotiation: quotes and negotiations run by software within pre-approved limits, with a buyer reviewing outcomes. The AI in procurement guide covers the controls such agents need.
• Intake as the single front door: one request form that decides whether a need goes to a catalogue, a card, a quote or a contract.
• Virtual and single-use cards: a card number per purchase or per supplier, which keeps card control without a shared physical card.
• Marketplaces and managed tail services: an outside provider buys or aggregates purchases under the organisation’s rules.

Automation does not remove the need for rules. An agent that collects quotes still needs to know which suppliers may be used, what it may commit to and when a person must approve; a supplier created in seconds still needs its bank details and sanctions status checked before it is paid.