Working Capital ManagementControlling and Optimising Liquidity in Procurement

Gross and Net Working Capital

Gross working capital comprises all current assets, including inventories, receivables and cash. Net working capital is obtained by deducting short-term liabilities; it shows which part of short-term assets is not externally financed. In practice, net working capital is often used as the steering variable because it reflects the capital tied up.

Distinction from Cash Management

Cash management focuses on short-term payment flows and liquidity planning, whereas working capital management looks at the underlying drivers: inventories, invoice cycle times and payment terms. For procurement, this means: whoever negotiates payment terms directly affects working capital, not just the liquidity position at month-end.

Payment Terms as a Negotiating Lever

Payment terms and early payment discounts are the classic levers. A discount such as 2/10 net 30 can be assessed as an annualised interest rate in the discount calculation and typically lies well above classic credit costs in practice, which is why taking the discount is usually advantageous as long as the company's own liquidity is sufficient. Conversely: whoever stretches payment terms beyond industry norms often pays for it through higher purchase prices or lower supplier priority.

Inventory Policy and Stock

Inventories are capital tied up with warehousing costs and the risk of depreciation or obsolescence. An inventory policy grounded in risk management separates strategic reserves from operational dead stock and prevents safety stocks from growing unnoticed. Blocked stock management and regular inventory clean-ups are therefore part of procurement's working capital management.

Fairness towards Suppliers

Extremely long payment terms act as silent credit at the supplier's expense and can weaken its liquidity. This increases default and supply risks in the medium term and contradicts sustainable supplier risk management. Balanced payment terms are therefore also a resilience issue, not merely a financing issue.

Four-Step Process Model

First, the current state is made transparent through CCC, inventory and cycle-time analyses, including a risk analysis of the most important value streams. This is followed by target metrics per function, the implementation of concrete measures and monitoring with clear responsibilities. Often a small cross-functional team from procurement, finance and supply chain is established.

Instruments in Detail

The choice of instruments depends on the industry, supplier structure and access to capital markets. Medium-sized companies often start with payment terms and inventory clean-up before introducing financing instruments.

• Discount calculation and dynamic discounting models to value earlier payments
• Supply chain finance or reverse factoring for longer payment terms while paying the supplier early
• Inventory optimisation through ABC/XYZ analyses and planning parameters
• Streamlining goods receipt and invoice verification to shorten cycle times
• Contracts with clear provisions on payment terms, default and freight surcharges

Digital Support

ERP and e-procurement systems provide the data basis: open purchase orders, invoice status and inventory developments. In practice, the greatest leverage is achieved when processes are automated—for example invoice receipt, goods receipt matching and approvals—because this reduces invoice cycle times and makes discount windows realistically usable.

Cash Conversion Cycle and Its Components

The cash conversion cycle (CCC) results from inventory days plus receivable days minus payable days; it shows how many days capital is tied up between goods receipt and cash receipt. The shorter the CCC, the lower the financing requirement. It is important to consider the individual components, because improvements in one place can be offset elsewhere.

Further Steering Metrics

All metrics should be reviewed over several periods and compared within the industry. Absolute benchmarks alone are of little value, as capital intensity, industry and business model vary greatly.

• Days Payable Outstanding (DPO): average age of outstanding supplier liabilities
• Days Inventory Outstanding (DIO): average time inventory is held
• Days Sales Outstanding (DSO): average age of receivables
• Discount utilisation rate: proportion of invoices paid with an early payment discount
• Working capital turnover: revenue in relation to capital tied up

Typical Pitfalls

Whoever weakens suppliers financially must expect longer reaction times, quality problems or supply failures. Supplier escalation may then become necessary, in serious cases with 8D containment in the event of quality deviations. Such consequential costs belong in every business case calculation.

• Unilaterally stretching payment terms and thereby putting suppliers under pressure
• Radically cutting safety stocks and jeopardising resilience
• Letting discount periods lapse due to slow invoice processes
• Reducing inventory without regard to spare part and single-sourcing risks

Controls and Governance

Effective controls include regular supplier evaluations including financial metrics, a risk management system with clear risk assessment—for example as a risk heatmap—and contractual instruments such as the right to audit where there are legitimate doubts about supplier statements. A business continuity plan (BCP) for critical parts ensures that liquidity optimisation does not create dependence on failure-prone sources.

International Aspects

For international business, currency risks, differing payment practices and documentation requirements come into play. Instruments such as the ATA Carnet simplify temporary exports, and a clean payment processing set-up with correct BIC/SWIFT handling reduces friction losses. Legal frameworks, for example on payment terms in commercial transactions, should be reviewed on a case-by-case basis.

Resilience versus Capital Tied Up

After supply chain disruptions, many companies increased safety stocks and thereby tied up working capital. The current debate revolves around how resilience can be built up in a targeted rather than blanket manner, for example through diversified sources, better supply chain mapping transparency and scalable contract models. Risk analysis and capital efficiency are considered together.

Dynamic Payment Models and Financing

Dynamic discounting and supply chain finance programmes reconcile the liquidity interests of both sides: the buyer extends payment terms while the supplier can sell invoices early at a discount. Reliable processes and approved invoices are a prerequisite; transparency and fairness determine the level of acceptance among suppliers.

Sustainability and Data

Sustainability requirements along the supply chain, such as reports on Scope 1 emissions from one's own operations as the starting point for emissions accounting, expand supplier evaluation and thus also the basis for payment and financing decisions. At the same time, data models and AI-supported analyses improve the forecasting of inventories and incoming payments, which agile procurement can use for capital planning.