Operating capital (working capital) becomes a procurement issue when cash is tied up in purchased materials, advance payments, unfinished supplier work, excess commitments, or inefficient payment processes.

For a procurement manager, the objective is not simply to reduce inventory or delay supplier payments. The objective is to release cash without creating supply interruptions, quality problems, higher total cost, or financially unstable suppliers.

A practical way to organize this work is to classify procured materials and services into Groups A, B and C. Procurement can then apply the right level of management attention, commercial control, supplier collaboration, and process automation to each group.

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LHTS procurement framework

Role: Procurement management
Supporting roles: Tactical and operative procurement
Process: Procurement planning, category management, sourcing, contracting, implementation, supplier management and Procure-to-Pay
Level: Advanced
Related program: Move from Operational Buying to Strategic Sourcing

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Quick answer: How can procurement optimize operating capital?

Procurement can optimize operating capital by managing the amount and timing of cash committed to suppliers.

The main procurement levers are:

• reducing excess inventory and unnecessary commitments;
• improving lead times, order quantities and delivery frequency;
• negotiating appropriate payment terms;
• using supplier collaboration, consignment stock and supply-chain finance;
• preventing early, duplicate or incorrect payments;
• applying different controls to A, B and C purchases.

The target is not the lowest possible inventory or the longest possible payment term. The target is the best balance between cash, cost, supply continuity, quality and supplier sustainability.

What is operating capital (working capital)?

In financial management, working capital is normally defined as current assets minus current liabilities. Operationally, the cash conversion cycle is commonly expressed as:

Days Inventory Outstanding + Days Sales Outstanding – Days Payable Outstanding

Procurement directly influences two parts of this cycle:

1. Inventory, through what is ordered, how much is ordered, when it is delivered and who owns the stock.
2. Accounts payable, through contract terms, payment terms, invoicing requirements and purchase-to-pay execution.

APQC describes the cash-to-cash cycle in similar terms: inventory days plus sales outstanding, less the average payment period for materials.

Procurement also influences forms of capital commitment that are not visible as conventional warehouse inventory. Examples include:

• advance payments;
• supplier deposits;
• prepaid service contracts;
• minimum-volume commitments;
• unused software licences;
• reserved consultancy capacity;
• milestone payments made before value has been accepted;
• supplier-owned work in progress that will eventually be invoiced;
• open purchase orders that no longer reflect a valid need.

This is why procurement management should look beyond physical stock.

The procurement manager’s responsibility

An operative buyer can expedite, reschedule or cancel an individual order. A tactical buyer can negotiate a better call-off model or shorter lead time. Procurement management must create the system that makes these actions consistent across the organization.

The procurement manager should establish:

• a common definition of operating-capital responsibility;
• category-specific A, B and C rules;
• decision rights for inventory, payment terms and supplier financing;
• common KPIs with finance, operations and supply-chain management;
• governance for exceptions;
• incentives that do not reward purchase-price savings at the expense of cash;
• regular reviews of capital tied up by category and supplier.

Working-capital improvement is therefore not a separate finance project. It should be built into category strategies, sourcing decisions, contracts, ordering processes and supplier reviews.

Why A, B and C classification is useful

Traditional ABC inventory analysis divides items according to their financial importance. A items normally represent a relatively small number of items but a large share of total consumption value. B items have moderate importance, while C items are numerous but individually account for a smaller share of value.

The principle is useful because procurement resources are limited. Every purchase should not receive the same level of analysis, control or management attention.

However, annual purchase value alone is not enough.

A low-value component can stop production. A service contract can create a substantial prepayment without producing physical inventory. A high-spend supplier may offer very flexible call-off arrangements and therefore create less capital exposure than a lower-spend supplier with large minimum order quantities.

Procurement should therefore classify purchases using several dimensions:

• annual spend or consumption value;
• inventory or prepayment exposure;
• supply-continuity risk;
• lead time;
• demand uncertainty;
• substitutability;
• minimum order quantity;
• obsolescence risk;
• supplier financial risk;
• cost of administering the purchase.

This produces a management classification rather than a purely accounting-based classification.

Group A: High capital exposure or high business impact

Group A should contain the purchases that justify close management attention.

These may be high-value materials, strategically important components, long-lead-time equipment, large outsourced-service agreements, significant advance payments, or contracts with major volume commitments.

Management approach for Group A materials

For A materials, procurement should work cross-functionally with planning, operations, engineering, finance and key suppliers.

Relevant activities include:

Improve forecast and demand visibility.
Share credible demand information with suppliers and distinguish firm requirements from forecasts. Forecast quality matters, but procurement must also understand how suppliers translate forecasts into raw-material commitments and capacity decisions.

Reduce and stabilize lead times.
A shorter and more reliable replenishment lead time can reduce the stock needed to protect operations. Procurement can address lead time through supplier-development work, local or regional sourcing, capacity agreements, better information exchange and redesigned approval processes.

Challenge minimum order quantities and batch sizes.
A low unit price combined with a large minimum order quantity can consume more cash than a slightly higher unit price with flexible ordering. The sourcing decision should therefore evaluate total cost and capital impact together.

Introduce scheduled or call-off deliveries.
A framework agreement can secure commercial conditions while allowing the buyer to release smaller quantities as demand becomes clearer.

Consider consignment or supplier-managed inventory.
The supplier may retain ownership until the material is consumed or withdrawn. This can reduce the buyer’s inventory investment, but the commercial model must allocate financing cost, obsolescence risk, insurance, stock accuracy and replenishment responsibility clearly.

Review safety-stock assumptions.
Safety stock should be linked to demand variation, lead-time variation, service requirements and supply risk. It should not remain unchanged simply because “this is how we have always planned the item.”

Manage excess and obsolete stock.
Procurement should help identify cancellation rights, returns, alternative users, supplier buy-backs, redesign options and resale opportunities before inventory becomes obsolete.

Management approach for Group A services

Services require a different interpretation because there may be no physical inventory.

For A services, procurement should examine:

• the size and timing of advance payments;
• milestone definitions;
• acceptance criteria;
• unused retained capacity;
• minimum-volume commitments;
• automatic renewals;
• notice periods;
• unused licences or subscriptions;
• the difference between ordered, delivered, accepted and invoiced value.

Payment should follow verifiable value delivery whenever commercially reasonable. A milestone such as “50% on contract signature” gives the supplier financing but provides the buyer with little performance protection. A better structure may connect payments to approved designs, accepted deliverables, completed tests, implemented functionality or measurable outcomes.

The procurement manager should also decide whether advance payments require security such as a parent-company guarantee, bank guarantee, advance-payment guarantee, escrow arrangement or ownership of work in progress.

Group B: Moderate exposure requiring standardized control

Group B contains purchases that matter financially but do not justify the same level of individual attention as Group A.

The management objective is to establish repeatable controls and monitor exceptions.

For B materials, typical tools include:

• standard replenishment parameters;
• periodic reviews of order quantities and safety stock;
• agreed delivery calendars;
• framework agreements with call-off orders;
• supplier performance scorecards;
• automated alerts for excess stock, late delivery and forecast deviation;
• annual or semi-annual review of lead times and minimum quantities.

For B services, procurement can use:

• standardized statements of work;
• approved rate cards;
• capped purchase orders;
• milestone templates;
• time-reporting and approval routines;
• quarterly reviews of utilization;
• renewal alerts;
• standard payment and acceptance terms.

Some B purchases will move into Group A when supply risk, demand volatility or financial exposure increases. The classification should therefore be reviewed rather than treated as permanent master data.

Group C: Low-value purchases requiring low-cost processes

Group C often contains a large number of low-value materials and services. Individually, they have limited financial impact, but the administrative cost of ordering, receiving, approving and paying for them can be substantial.

The objective for Group C is usually not intensive item-by-item optimization. It is simplification, aggregation and automation.

Appropriate tools may include:

• catalogues and guided buying;
• procurement cards;
• blanket purchase orders;
• supplier consolidation;
• vending solutions;
• two-bin or Kanban replenishment;
• periodic consolidated deliveries;
• standard service packages;
• self-service ordering within predefined controls;
• automated three-way matching;
• reduced approval effort for low-risk purchases.

A common mistake is to negotiate very low prices for C items while creating frequent deliveries, invoices and approval transactions. The process cost can exceed the price saving.

At the same time, procurement should not assume that all low-value items are low risk. A low-cost seal, fastener, chemical or maintenance service can still stop production or create a safety issue. Critical low-value purchases may therefore require A-level continuity controls even when their financial value places them in Group C.

Procurement’s principal operating-capital tools

ABC classification tells procurement where to focus. It does not by itself release cash. Improvement comes from applying commercial and operational tools.

1. Specification and demand management

The earliest opportunity arises before the supplier is selected.

Procurement can challenge:

• unnecessary variety;
• overly restrictive specifications;
• custom solutions where standards would work;
• duplicate software and service subscriptions;
• excessive service levels;
• automatic replacement policies;
• uncoordinated demand across business units.

Standardization can pool demand, improve competition, reduce safety stock and simplify supplier management.

2. Lead-time management

Long or unreliable lead times create a need for buffers. Procurement can address both the quoted lead time and its underlying causes.

Possible actions include:

• supplier process mapping;
• shorter approval loops;
• electronic information exchange;
• reserving capacity;
• alternative transport arrangements;
• localization;
• postponement;
• dual sourcing;
• supplier-development projects.

Dual sourcing can improve resilience, but it can also split volumes, increase complexity and create duplicated safety stock. It should be evaluated as an economic and risk decision, not as an automatic solution.

3. Order-quantity and delivery-frequency management

The economic order quantity may reduce ordering and holding costs under simplified assumptions, but procurement must also consider:

• minimum order quantities;
• packaging multiples;
• transport economics;
• shelf life;
• obsolescence;
• demand volatility;
• capacity constraints;
• the supplier’s production batch;
• administrative transaction cost.

The best commercial model may separate the supplier’s production batch from the buyer’s delivery quantity. The supplier can manufacture an efficient batch but deliver it in smaller releases, provided ownership, storage cost and liability are clearly agreed.

4. Payment terms

Payment terms are one of procurement’s most visible working-capital levers.

Procurement can:

• establish category-specific standard terms;
• remove unjustified exceptions;
• compare terms across suppliers and categories;
• align payment terms with delivery, acceptance and invoice approval;
• negotiate terms during competitive sourcing rather than after supplier selection;
• ensure that negotiated terms are correctly entered into contracts, supplier master data and purchase orders.

Standardized supplier payment terms can improve both accounts-payable efficiency and compliance.

However, simply extending every supplier from 30 to 60 or 90 days is not a mature strategy. A supplier may recover its financing cost through higher prices, reduce service levels, reject the business, or suffer liquidity problems. McKinsey cautions that excessive inventory reductions can disrupt operations and poorly negotiated term extensions can return as higher prices or signal financial distress.

Payment terms should therefore reflect supplier economics, competition, dependency, financial strength and total value.

5. Supply-chain finance and dynamic discounting

Supply-chain finance can allow the buyer to retain longer payment terms while giving an approved supplier access to earlier payment from a financing provider.

Dynamic discounting uses the buyer’s available cash to pay earlier in return for a discount. It may be attractive when the financial return exceeds the buyer’s alternative return on cash and when supplier liquidity is important.

These tools should not conceal a fundamentally unsustainable contract. They should support a balanced commercial arrangement.

6. Contract and milestone design

Contracts determine when financial commitments become payable.

Procurement should define:

• when ownership transfers;
• when risk transfers;
• how delivery is evidenced;
• how services are accepted;
• which documentation is required;
• whether partial delivery can be invoiced;
• how disputed amounts are handled;
• whether advance payments are secured;
• what happens to unused material or capacity;
• cancellation and rescheduling rights;
• liability for obsolete stock.

Poorly designed milestones can cause the buyer to finance supplier activity long before usable value is received.

7. Purchase-to-Pay compliance

A negotiated payment term creates no benefit when the organization pays invoices early, uses the wrong supplier master data, or bypasses the contract.

Procurement management should monitor:

• purchases without purchase orders;
• invoices received before goods or services;
• early payments;
• duplicate invoices;
• blocked invoices;
• incorrect payment terms;
• late goods receipt;
• invoice disputes;
• open or obsolete purchase orders;
• contract leakage.

McKinsey gives a useful illustration: avoiding payments five days earlier than required on €1 billion of annual spend could release approximately €14 million in cash.

The lesson is straightforward: execution quality matters as much as negotiation.

A management dashboard for operating capital

The procurement manager should agree a limited set of measures with finance and operations.

Useful indicators include:

• Days Inventory Outstanding;
• Days Payable Outstanding;
• cash conversion cycle;
• inventory value by A, B and C group;
• excess and obsolete inventory;
• forecast accuracy and forecast bias;
• supplier lead-time reliability;
• average order quantity;
• purchase-order rescheduling and cancellation value;
• percentage of spend on standard payment terms;
• actual versus contracted payment terms;
• early-payment value;
• advance payments outstanding;
• open purchase-order value;
• value of unused service commitments;
• supplier financial-risk exposure.

Deloitte notes that improvements in cash conversion have recently been driven in many organizations by lower inventory days and longer payable days, but warns that such gains may reflect active short-term management rather than sustainable end-to-end efficiency.

This distinction is important. A temporary stock reduction before the financial year-end is not the same as a permanently improved replenishment model.

How this connects to the procurement process

Operating-capital management should appear throughout the procurement lifecycle.

Procurement planning

Set cash objectives, clarify ownership and identify categories with significant inventory, prepayment or commitment exposure.

Category management

Include operating-capital baselines, supplier-market practices, lead times, payment models and inventory drivers in the category analysis.

Sourcing

Ask suppliers to quote alternative commercial models, such as:

• different lead times;
• different order quantities;
• call-off delivery;
• consignment;
• alternative payment terms;
• milestone options;
• supplier-finance participation.

Evaluate the total economic effect rather than comparing unit prices alone.

Contracting

Translate the selected operating model into enforceable terms covering delivery, ownership, invoicing, acceptance, cancellation and payment.

Implementation

Update purchase-order parameters, supplier master data, planning systems, catalogues, approval flows and invoice-matching rules.

Supplier management

Review forecast reliability, lead-time performance, inventory, capacity, invoicing quality and improvement plans with selected suppliers.

Procure-to-Pay

Make sure transactions comply with the contract and that approved invoices are paid on the agreed date—neither unnecessarily early nor unfairly late.

Practical implementation: a 90-day management programme

A procurement manager can begin with a focused programme.

Days 1–30: Establish visibility

• Agree definitions with finance and supply-chain management.
• Measure inventory, advance payments, open commitments and payment terms.
• Classify materials and services into A, B and C groups.
• Identify the largest sources of capital exposure.
• Separate structural problems from temporary fluctuations.

Days 31–60: Select and validate actions

For each major opportunity, identify the underlying driver.

Examples:

• excessive safety stock caused by unreliable lead time;
• high inventory caused by minimum order quantities;
• advance payments caused by supplier custom rather than actual need;
• early payment caused by incorrect master data;
• unused service commitments caused by weak demand governance.

Validate potential changes with operations, finance and suppliers. Assess the effects on cost, risk, availability and supplier viability.

Days 61–90: Implement and govern

• Renegotiate selected terms.
• Correct system parameters.
• assign action owners;
• establish recurring dashboards;
• include capital measures in category and supplier reviews;
• document exceptions;
• track released cash separately from accounting movements;
• prevent benefits from returning after the programme ends.

Common mistakes

Treating ABC classification as an inventory report

The classification is only useful when each group has different decision rules, controls and management actions.

Classifying only by annual spend

Financial value matters, but continuity risk, lead time, obsolescence, prepayments and service commitments must also be considered.

Extending all supplier payment terms indiscriminately

This may increase price, weaken suppliers and damage relationships. Terms should reflect category and supplier conditions.

Rewarding purchase-price savings while ignoring inventory

A buyer may negotiate a lower price by accepting a larger order quantity. Procurement reporting must recognize the resulting capital and obsolescence costs.

Reducing stock without addressing the cause

Inventory will return when lead-time variation, poor forecasts, unreliable suppliers or obsolete planning parameters remain unchanged.

Ignoring services

Prepaid contracts, unused licences, retainers and minimum-volume agreements can tie up significant cash even though no warehouse stock exists.

Treating the project as procurement-only

Procurement controls supplier-facing levers, but demand, planning, acceptance, goods receipt and payment involve several functions. Sustainable improvement requires shared ownership.

Conclusion

Procurement has more influence over operating capital than payment-term negotiation alone suggests.

The function influences specifications, demand aggregation, lead times, minimum quantities, delivery models, inventory ownership, advance payments, milestones, supplier financing and purchase-to-pay compliance.

A, B and C grouping helps procurement management allocate effort intelligently:

• Group A requires close cross-functional control and supplier collaboration.
• Group B requires standardized parameters and regular exception management.
• Group C requires simplification, aggregation and automation.

The procurement manager’s task is to turn these principles into category strategies, contracts, systems, KPIs and daily buyer behaviour.

The goal is not to push capital or risk blindly onto suppliers. It is to design a supply and payment model that uses less cash while maintaining total cost, operational continuity and healthy supplier relationships.

Related learning

The Learn How to Source programme Move from Operational Buying to Strategic Sourcing provides a relevant management-level foundation for developing procurement from transactional order handling into a structured function that creates measurable business value.

The course Operative Procurement Processes can support the implementation side by explaining the day-to-day processes and responsibilities of the operative buyer.

Frequently asked questions

What is the difference between operating capital and working capital?

Working capital is the established financial term for current assets minus current liabilities. Operating capital is sometimes used more broadly to describe the capital required to run operations. In procurement discussions, both expressions often refer to cash tied up in inventory, supplier payments and purchasing commitments.

How does procurement affect working capital?

Procurement affects inventory through specifications, lead times, order quantities, delivery schedules and ownership models. It affects accounts payable through payment terms, invoice requirements, milestone structures and purchase-to-pay compliance.

What are A, B and C purchases?

A purchases have high financial exposure or business impact and require close control. B purchases require standardized management and periodic review. C purchases are individually low value and should normally be handled through simple, efficient processes. Criticality should be considered in addition to spend.

Can ABC analysis be applied to services?

Yes. Services can be classified according to contract value, prepayments, commitment level, business criticality, substitutability and financial risk. The focus is on committed or prepaid capital rather than warehouse inventory.

Should procurement always negotiate longer payment terms?

No. Longer terms can improve the buyer’s cash position, but they may increase supplier prices or financial risk. The right term depends on the commercial situation and the supplier’s financial capacity.

Is consignment stock always beneficial?

No. Consignment can reduce the buyer’s recorded inventory, but the supplier will still finance the stock and may include that cost in the price. Ownership, obsolescence, insurance, stock accuracy and termination arrangements must be clearly defined.

Who owns operating-capital improvement?

Finance normally owns the financial measure. Procurement, operations, supply-chain management, sales and accounts payable influence different parts of the result. Procurement management should own the supplier-facing commercial levers and ensure their implementation.