Supplier Payment Terms Treasury Should Model Before Renegotiation

Supplier payment terms can release substantial working capital, but longer terms do not automatically create economic value. For example, extending terms by 15 days across £40 million of eligible annual spend could increase average cash retained by about £1.64 million. That is a balance-sheet benefit, not £1.64 million of recurring profit. 

If suppliers increase prices, require financing support or lose operational flexibility, the annual benefit can disappear quickly. Treasury and procurement should therefore model liquidity, funding costs, contractual dates and supplier resilience before opening a renegotiation. 

ETR Digital’s cash conversion cycle calculator can help identify where cash is tied up. The decision model should then answer four questions: how much cash can realistically be released, what is its annual value, how might suppliers respond, and which contractual obligations must be protected? 

Establish the supplier payment terms baseline

Begin with supplier-level data rather than headline terms from an accounts payable report. A supplier recorded on 30-day terms may actually be paid after 42 days. Moving the contract to 45 days would then create only three additional days of cash retention, not the apparent 15-day improvement. 

Keep three measures separate: current contractual terms, actual settlement behaviour, and the proposed settlement date. The baseline should also include: 

• Annual and eligible spend using recent volumes and known purchasing changes. 
• Payment triggers such as invoice receipt, validation or acceptance of goods. 
• Supplier funding including borrowing costs, discounts and existing programmes. 
• Supplier criticality including financial sensitivity and substitution difficulty. 
• Contractual constraints across relevant agreements and jurisdictions. 

This review may reveal that delayed approvals, disputes or manual processing are the real causes of poor working capital performance. Fixing those issues can improve predictability without changing commercial terms. 

Calculate cash released and annual value 

The initial liquidity calculation is: 

Average cash released = Annual eligible supplier spend × Additional payment days ÷ 365 

Consider a business with £24 million of annual supplier spend, of which 80%, or £19.2 million, is eligible. The sensitivity below assumes uniform expenditure and a 6% marginal funding rate. 

Illustrative calculations only. Figures are rounded and are not ETR Digital customer results. 

The cash released should not be reported as an annual saving. Applying a 6% funding rate to £789,041 produces an annual funding value of about £47,342. A supplier price increase of only 0.25% across £19.2 million would cost £48,000 and remove that benefit. Seasonal businesses should also model monthly or weekly cash flows rather than relying on an annual average. 

Include supplier and programme costs 

Longer terms do not eliminate the cost of finance. They often transfer it. Suppliers may use borrowing or invoice finance to carry receivables for longer, then recover the cost through pricing, surcharges or reduced flexibility. 

Include supplier borrowing, lost early-payment discounts, price changes, bank and platform fees, implementation costs, administration, and relevant interest-rate or currency exposure. As a simple illustration, financing £1 million for an additional 40 days at 8% costs about £8,767. 

A practical decision measure is: 

Net annual economic value = Annual funding benefit − financing costs − commercial concessions − expected disruption costs 

This measure should sit alongside the cash released and DPO improvement, not be replaced by them. 

Keep contractual and financing dates separate 

Treasury should maintain separate fields for the contractual invoice due date, the date on which a supplier receives funding and the maturity date of any financing instrument. These dates may differ, and issuing a financing instrument does not automatically amend the underlying contract. 

The payment clock may begin on the invoice date, receipt of a valid invoice, acceptance of goods or another defined event. Payment runs, disputes and local rules can also affect the actual date. Current UK payment practices reporting guidance distinguishes agreed terms from actual payment performance and requires qualifying businesses to report changes to standard terms and how suppliers were notified or consulted. 

Legal, accounting and compliance teams should review any change in contractual terms or financing structure before implementation.

Model supplier resilience 

Segment suppliers by financial sensitivity, operational criticality, substitution difficulty, commercial flexibility and relationship quality. A large, well-funded supplier may absorb a change that places a specialist small business under material pressure. 

Stress-test the expected cost of disruption. If a proposal releases £200,000 of working capital, its annual value at 6% is £12,000. Even a modest increase in the expected cost of production delays, emergency sourcing or additional inventory could outweigh that return. 

The strongest programme is not necessarily the one that maximises DPO. It is the one that improves liquidity without creating disproportionate risk elsewhere in the business.  

Compare three supplier payment terms scenarios 

Preserve terms and improve payment efficiency 

Reduce approval delays, disputes and uncertainty while retaining current contractual dates. This can be the best option for vulnerable or strategically important suppliers. 

Extend terms without supplier financing 

Model 15-day and 30-day extensions with realistic participation, repricing and operational-risk assumptions. This scenario may improve buyer liquidity while increasing supplier funding pressure. 

Use a financing-supported extension 

A suitable structure may allow a supplier to receive funds earlier while the buyer settles at a later agreed maturity. Working Capital Notes™ are digital negotiable instruments that can support financeable payment obligations and structured settlement workflows. 

Treasury should assess funder appetite, supplier eligibility, pricing, documentation, controls, and the relevant legal and accounting treatment. The structure should improve the combined economic outcome, not merely shift cost or risk between participants. 

Supplier payment terms checklist 

• Reconcile agreed terms, payment triggers and actual settlement behaviour. 
• Segment suppliers by spend, resilience, criticality and ease of substitution. 
• Calculate cash released under realistic participation assumptions. 
• Convert the liquidity benefit into annual funding value. 
• Deduct financing costs, repricing, fees and expected disruption costs. 
• Review contractual, legal, accounting and reporting requirements. 
• Compare unchanged, conventional extension and financing-supported scenarios. 
• Pilot with a controlled supplier group and measure realised outcomes. 

Frequently asked questions 

How do supplier payment terms affect working capital 

Later settlement generally increases accounts payable and allows the buyer to retain cash for longer. The actual benefit depends on eligible spend, realised payment dates, supplier participation and the related costs. 

Is extending supplier payment terms always beneficial 

No. Longer terms may increase supplier borrowing costs, purchasing prices or continuity risk. Treasury should compare annual economic value with the liquidity released. 

Can suppliers receive cash before the buyer settles 

Potentially. An appropriately structured financing arrangement may separate the supplier funding date from the buyer’s maturity date. Availability and outcomes depend on eligibility, pricing, documentation and applicable law. 

Renegotiate using the complete economic picture 

Supplier payment terms should balance liquidity, financing cost, contractual certainty and supplier resilience. A disciplined model makes those trade-offs visible before negotiations begin and prevents a headline DPO improvement from concealing a negative economic result. 

Contact ETR Digital to discuss a treasury fit assessment and explore whether Working Capital Notes™ could support buyer liquidity and earlier supplier access to funding. 

This article is for general information only and does not constitute legal, accounting, tax or investment advice. Obtain advice appropriate to the relevant contracts, jurisdictions and financing structure.