Why Payment Term Extensions Are Not Easy, and What Replaces the Blunt Approach

An objection worth taking seriously

In its January 2025 article on transformation momentum, consultancy company, McKinsey made an observation that sits awkwardly with how many working capital programs are designed. It noted that as capital costs have risen, traditional methods of cash optimization, including extending payment terms with suppliers, have become less effective, because suppliers are less willing to accept an extension they would have to fund from their own capital.

That is not a minor caveat. It challenges the mechanism a large share of working capital initiatives depend on, and it comes from a credible source at a moment when many organizations are setting exactly those targets.

The useful response is to accept the finding and be precise about its scope. What has become harder is the undifferentiated extension: the same request, made of an entire supplier base, justified by the buyer's requirement rather than by anything specific to the supplier receiving it. That approach was always inefficient. In a more expensive capital environment it fails more visibly.

This article examines why the blunt approach is the one under pressure, what an extension costs a supplier, and what a differentiated alternative involves.

What the supplier is being asked to do

An extension moves a financing requirement from one balance sheet to another. When a buyer moves from 45 day terms to 75, the supplier carries an additional 30 days of receivable and funds that receivable at its own cost of capital rather than at the buyer's.

This is the part that has changed. The gap between a large investment grade buyer's cost of funds and a mid-market supplier's has always existed, but when capital was inexpensive the absolute cost of carrying an extra 30 days was modest enough that many suppliers absorbed it without much resistance. The advisory company, Boston Consulting Group (BCG) assesses that a net new dollar of capital may now carry roughly double the cost it did a few years ago. The same request lands considerably harder in that environment.

The shift also affects the negotiation itself. A supplier that previously treated an extension as an administrative matter is more likely to treat it as a financing decision, and financing decisions are escalated to people who model them.

The costs that return

McKinsey made a related point that all reductions in working capital are beneficial, and stretching supplier payment terms can leak back in the form of higher prices if the extension is not negotiated carefully, or can unintentionally signal distress to the market. Those risks behave differently and are worth separating.

The price that returns

A supplier that accepts an extension it cannot comfortably fund will generally seek to recover the cost, and price is the most available route. The recovery rarely arrives as an explicit adjustment tied to the terms change. It tends to appear at the next renewal, in reduced willingness to hold pricing, or in the quiet withdrawal of concessions that were previously available. The working capital gain is then being paid for out of margin, which is a poor trade and a difficult one to observe.

The signal that is sent

A broad extension program communicated across a supplier base is a public act, whatever the intent. Suppliers talk to one another, and in some sectors they talk to the press. An organization that is financially healthy and pursuing a legitimate improvement can find the move read as a liquidity problem, which is an expensive misreading to correct.

The supply risk that follows

For suppliers already operating with constrained access to capital, an extension can move a tight position into a distressed one. That is a supply continuity exposure created by a finance decision, and it tends to surface at an inconvenient moment.

Headroom is not evenly distributed

This is where the undifferentiated approach does most of its damage. A uniform target assumes a uniform supply base, and no supply base is uniform.

Within the same portfolio there are typically suppliers operating well inside what is standard for their industry and geography, who could move without strain, and suppliers already at or beyond the local norm, for whom the same request represents a genuine burden. A target applied across both groups extracts too little from the first and too much from the second.

The practical consequence is that the question changes. It is not how many days can be added across the base. It is where headroom exists, how much, and what providing it costs the supplier. Those questions are answered supplier by supplier rather than at portfolio level, and four inputs carry most of the weight.

Position against market practice

Where a supplier's current terms sit relative to what comparable organizations achieve with comparable suppliers in the same industry and geography. This is the most informative input and the one least likely to be available from internal systems.

Supplier cost of capital

What the additional receivable actually costs that business to carry. A supplier funding at local rates in a high-rate market is being asked for considerably more than a supplier with investment grade access to credit, even where the number of days is identical.

Materiality of the relationship

The share of the supplier's revenue represented by this buyer, which affects both the impact of a change and the supplier's willingness to discuss it.

Strategic and supply risk

Whether the supplier is substitutable, and what a deterioration in its financial position would cost operationally.

Aligning to market rather than extracting from suppliers

There is a reframing available here that changes the nature of the conversation, and it comes from BCG rather than from anyone selling benchmarking.

Among the levers BCG recommends for improving balance sheet performance is realigning standard payment terms to market, which it notes also reduces credit risk. The phrasing is worth attention. Not extending terms. Realigning them to market. The implied question is not how much can be extracted but whether the current position reflects where the market sits.

That distinction matters commercially. A supplier presented with a request for 30 additional days to improve the buyer's cash position is being asked for a concession. A supplier shown credible evidence that the terms in question sit well below what is typical for that industry, geography, and supplier profile is being asked a question about alignment with market practice. The second conversation is better grounded and tends to generate less of the resentment that produces price recovery later.

It does not guarantee agreement. A supplier may accept the benchmark and still decline, on the basis that its own funding position makes the change unaffordable, that the relationship warrants different treatment, or simply that it prefers the current terms. Market evidence improves the quality of the argument and the probability of a reasoned outcome. It does not substitute for the negotiation.

It also depends on the evidence being the right kind. Benchmarks that support this conversation are aggregated and anonymized market data describing what is typical across comparable suppliers and segments, which is what Calculum's platform is built to provide. They are not, and should not be represented as, a view of the confidential terms agreed between two identifiable companies.

Where financing belongs, and where it does not

Supply chain finance has an obvious role in this picture and an obvious way of being misused.

Its legitimate function is to make an optimized term sustainable for a supplier that lacks the headroom to fund it alone. Where a buyer has concluded that a supplier's terms sit below market but that supplier cannot carry the extension at its own cost of funds, financing closes the gap and both parties can be better off.

Its weaker use is as the justification for the extension itself. An extension argued on the basis that the financing rate is lower than the supplier's cost of funds is only as durable as that differential, applies to none of the suppliers with strong credit, and invites renegotiation whenever rates move.

The sequence that holds is straightforward. Establish what the terms should be, supplier by supplier, against market evidence. Then determine which suppliers require financing to reach them. Financing supports the decision rather than making it.

What replaces the across-the-board target

A differentiated approach is more work than a uniform percentage, and it produces a target that survives contact with the supply base.

Build from market position rather than from the cash requirement. A target derived from what the finance plan needs will be arbitrary at supplier level. A target built up from supplier-level headroom aggregates into a number that can be defended in both directions.

Segment before approaching anyone. Suppliers with genuine headroom, suppliers who need financing to move, and suppliers who should not be approached at all. The third group is real, and naming it protects the program.

Estimate the supplier's side of the trade. Where the cost of the extension to that supplier cannot be estimated, neither can the likelihood that it will be recovered through price.

Separate the terms conversation from the financing offer. Presenting them together allows a supplier to decline the financing and treat that as grounds to decline the terms.

Review on a cycle rather than once. BCG recommends instituting a regular process to review and restructure terms over time. Market practice moves, supplier positions move, and a single exercise captures one moment.

None of this makes extension the wrong lever. It makes the uniform version of it the wrong instrument, which is a narrower and more useful conclusion than abandoning the lever altogether.

Frequently Asked Questions

Are supplier payment term extensions still an effective working capital lever?

They remain effective where genuine headroom exists and less effective where it does not. McKinsey observed that rising capital costs have made traditional extension approaches less effective, because suppliers must fund the extension from their own more expensive capital. The implication is that uniform targets applied across an entire supplier base meet more resistance than they once did, while differentiated approaches built on supplier-level market position continue to work.

What are the risks of extending supplier payment terms?

Three recur. The cost can return as price, typically at the next renewal rather than as an explicit adjustment, which converts a working capital gain into a margin loss. A broad extension program can be read externally as a liquidity problem regardless of the buyer's actual position. And for suppliers with constrained access to capital, an extension can create a supply continuity exposure.

How do you assess which suppliers can absorb a term extension?

By examining four factors at supplier level: where current terms sit relative to what comparable organizations achieve with comparable suppliers in the same industry and geography, the supplier's own cost of capital and funding position, the materiality of the buyer's spend in that supplier's revenue, and the supplier's strategic importance and substitutability. Market position is usually the most informative and the least likely to be available internally.

Does aligning terms to market guarantee that a supplier will accept?

No. Market evidence improves the quality of the argument and makes a reasoned outcome more likely, because the request becomes a question of alignment with typical practice rather than a demand for a concession. A supplier may still decline on the basis of its own funding position, the nature of the relationship, or a straightforward preference for current terms. Benchmarks inform the negotiation; they do not replace it.

Should supply chain finance be used to support a term extension?

It is well suited to making an optimized term sustainable for a supplier that lacks the headroom to fund it alone. It is less suited to justifying the extension in the first place. An extension argued on the rate differential between the buyer's financing and the supplier's cost of funds holds only while that differential does, does not apply to investment grade suppliers, and invites renegotiation whenever rates move.

About Calculum

Calculum is an AI-powered payment terms intelligence platform that helps enterprise finance, treasury, and procurement teams benchmark payment terms against aggregated and anonymized market data, identify optimization opportunities, and make data-driven working capital decisions. With coverage across millions of companies globally, Calculum supports differentiated negotiation by showing where terms sit against typical practice for comparable suppliers, rather than applying a single target across an entire supplier base.