How to Calculate Working Capital Opportunity

Before the program: the question most companies skip

Organizations that invest in a financing program without first quantifying the opportunity are building the solution before they understand the problem. They may launch the program, enroll some suppliers, and generate some cash flow improvement, but they rarely know whether they captured 20 percent of the potential or 80 percent.

There is an important distinction underneath that question, and it is the one most companies skip. Payment terms optimization determines what the commercial terms should be. Supply Chain Finance (SCF) determines how those terms can be funded efficiently. One sets the destination. The other provides the vehicle. The financial case begins with the destination, not the vehicle.

Quantifying the opportunity before you act is both more achievable and more important than most finance teams realize. It requires data, a methodology, and an honest comparison with what the market supports. Done well, it produces a financial case specific enough to drive executive commitment and precise enough to guide design. This article explains how to build that case.

The starting point: your current DPO versus what the market achieves

The working capital opportunity begins with a gap. If your organization currently pays suppliers in 45 days on average, and top-quartile peers in your industry pay in 75 days, you have a 30-day gap in Days Payable Outstanding (DPO). That gap represents unrealized working capital.

The financial translation is direct. As an illustration, a 30-day extension in payment terms generates roughly $82 million in additional free cash flow per $1 billion of addressable spend. For a $5 billion spend base, the same extension represents over $400 million in cash flow. A more modest 10-day improvement still represents tens of millions per $1 billion of spend. On most enterprise balance sheets, these are not rounding errors. They are material contributions to the cash position.

The challenge is that most organizations do not know their DPO gap with confidence. They know their own average payment days, but they lack reliable data on what their industry, geography, and supplier-type peers actually achieve. This intelligence deficit is what prevents accurate quantification, and it is why benchmarking comes before financing rather than after. You cannot optimize what you cannot benchmark.

Margins: the hidden dimension of working capital value

Working capital discussions tend to focus exclusively on DPO. There is a second, often underappreciated dimension of value: margin improvement.

Procurement and supply chain teams are typically incentivized to reduce the cost of purchased goods and services. What they often overlook is the cost of the working capital tied up in their payment cycles. Capital has a cost, and when it is deployed in accounts payable ahead of schedule, it is not available for higher-return uses.

Once terms are optimized, financing creates room for margin improvement in two ways. First, buyers who fund their own early-payment programs with excess cash can earn returns on that cash that are well above typical treasury deposit rates. Second, over time, as suppliers benefit from lower financing costs through an SCF program, there is scope to negotiate lower prices on purchased goods, translating the supplier's savings into buyer margin. These benefits are real but difficult to realize without procurement's active involvement. Incentive structures that focus only on purchase price need to be aligned with working capital and cash flow outcomes to capture this dimension of value.

Modelling the opportunity: a practical framework

Calculating the opportunity for a specific organization involves four inputs:

Total addressable spend. The annual spend with suppliers who could realistically be included in a payment terms optimization initiative or an SCF program. This is usually the subset of payables that meets minimum thresholds for term negotiation, typically larger, more established suppliers.
Current average payment days. The actual average time from invoice approval to payment across the addressable supplier base. This should be measured, not assumed.
Market benchmark. The average and top-quartile DPO for comparable companies in the same industry, geography, and size band. This is the target, not an internal goal.
Supplier acceptance rate. The proportion of addressable spend where suppliers are likely to accept term changes or join an SCF program. This depends on supplier characteristics, the quality of the offer, and the strength of the relationship.

With these four inputs, the opportunity can be modelled as the benchmark DPO minus current DPO, multiplied by addressable spend divided by 365, multiplied by the supplier acceptance rate. The result is the incremental free cash flow opportunity, expressed in dollars.

This calculation belongs at the start of any business case. It anchors the work in financial terms the CFO and board can evaluate, and it sets a benchmark against which performance can later be measured. Note what it measures first: the value of getting the terms right. Financing is what helps capture and sustain that value once the target is known.

Beyond the one-time gain: the compounding logic

An aspect of the opportunity that is often missed is that the benefit is not one-time. Once payment terms are extended, the improvement in DPO is structural. The cash flow benefit recurs every year for as long as the terms are maintained. That transforms the opportunity from a single initiative into a permanent change in the company's financial structure.

For a $5 billion spend base with a 30-day improvement, the roughly $400 million in cash released is not spent once and gone. It remains available on the balance sheet, working for the organization through reduced debt, higher returns on deployed capital, or investment in growth.

The same compounding logic applies to the cost of doing nothing. Every year a company operates with below-market payment terms is another year of foregone cash flow. The opportunity cost accumulates. Organizations that benchmark and optimize terms early capture more years of benefit.

How Calculum makes the calculation precise

The traditional difficulty in calculating the opportunity is that benchmark data is hard to obtain with enough granularity. Industry averages are too broad to be actionable, and internal analysis is limited by the organization's own data.

Calculum addresses this with AI-powered payment terms benchmarking across millions of companies globally. The platform provides benchmark data at the supplier level, by industry, geography, and supplier category, so organizations can calculate the DPO gap not just in aggregate but supplier by supplier. That level of precision turns the opportunity calculation from an estimate into a data-backed plan.

The output is a quantified, prioritized view of the opportunity, organized by supplier segment and timeline. For CFOs building the case for a payment terms optimization initiative, it provides the financial grounding that generic benchmarks cannot, and it makes clear where terms should move before any financing is applied.

Frequently Asked Questions

How much working capital can we realistically unlock by changing payment terms?

The realistic opportunity depends on your current DPO, your industry benchmark, your addressable spend base, and the likely supplier acceptance rate. As an illustration, a 30-day improvement in payment terms generates roughly $82 million in free cash flow per $1 billion of addressable spend. For organizations with significant DPO gaps relative to peers, the opportunity can be substantial. Calculum provides a supplier-level quantification of this opportunity based on real market benchmarks.

Should we optimize payment terms or set up the financing first?

Optimize first. Payment terms optimization determines what the terms should be; Supply Chain Finance determines how they are funded. Benchmarking identifies the gap and sets the target, and financing then helps capture and sustain it without disadvantaging suppliers. Setting up financing before you know where terms should sit risks building a program on terms that were never optimized in the first place.

How do CFOs improve free cash flow without increasing debt?

One of the most direct routes is optimizing Days Payable Outstanding. By benchmarking current terms against market norms and identifying where terms can be extended sustainably, supported by an SCF program so suppliers are not financially disadvantaged, organizations can release significant cash from the balance sheet. The cash freed this way improves free cash flow from operations rather than adding to the liability side.

What is the cost of extending payment terms to suppliers?

When terms are extended through a Supply Chain Finance program, the direct cost to the buyer is typically minimal, because a financial institution funds the early payment to suppliers and the servicing fee is usually recovered through the value of the cash released. When terms are extended without such a program, the cost to suppliers, in the form of higher financing needs or late-payment risk, may eventually return to the buyer as higher prices or reduced supply chain reliability. This is why optimization and financing are evaluated together, not in isolation.

Why should optimization include margin improvement, not just DPO?

DPO improvement releases cash, but margin improvement is an equally important dimension of value. Buyers who fund early-payment programs with excess cash can earn returns well above typical treasury deposit rates, and over time supplier savings can be translated into lower purchase prices. Capturing both dimensions requires alignment between treasury and procurement, with shared measures that reflect both cash flow and cost outcomes.

About Calculum

Calculum's payment terms intelligence platform helps organizations benchmark payment terms against the market, quantify the working capital opportunity before they act, and design data-driven payment terms strategies. By combining market intelligence, benchmarking, and analytics across millions of companies globally, Calculum helps finance, treasury, and procurement teams make more informed decisions about one of the largest levers available within the balance sheet.