A new prompt payment requirement under the UK’s Procurement Act has come into force, setting a target for 95% of valid, undisputed invoices on public sector contracts to be paid within 30 days. The change is intended to push faster cashflow through supply chains, with terms expected to cascade from contracting authorities to main contractors and then to subcontractors. Procurement and commercial teams are signalling that clearer evidence of payment performance, tighter approvals and quicker dispute resolution will be needed to hit the threshold. For contractors, the shift compresses the window for certification, valuation and e‑invoicing on public jobs. The rule arrives as margins remain thin and working capital tight, particularly for SMEs reliant on timely interim payments. Industry observers expect performance against the 30‑day metric to carry more weight in supplier selection and ongoing contract management.
TL;DR
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– Public projects now carry a 95% target to pay valid invoices within 30 days.
– Terms are expected to flow down to subcontractors, not just tier one suppliers.
– Buyers and primes will need stronger verification, dispute handling and reporting.
– Cashflow could improve for SMEs, but admin and data demands will rise.
How the 95%-in-30-days requirement lands on UK sites and in bid rooms
/> In practical terms, contracting authorities are expected to embed 30‑day terms in public contracts and monitor supplier performance against the 95% threshold. Tier one contractors will need to mirror those terms with their supply chains, aligning payment cycles, certification milestones and invoice formats to avoid slippage. Payment performance is likely to be scrutinised at selection and during delivery, with bidders asked to evidence processes, dispute timelines and system capability. Consultants and QS teams may need to tighten valuation and certification turnaround to prevent invoices drifting out of the 30‑day window. Digital invoicing, clean purchase order data and disciplined approvals will become central to demonstrating compliance.
On the ground, consider a regional highways scheme let by a local authority. A tier one moving from 45‑day habits to 30 days must align subcontract orders, application dates and evidence requirements to ensure invoices are considered “valid” as soon as valuations are certified. The contractor trains package managers to resolve queries earlier in the month and introduces a cut‑off for missing PO references that previously went unchallenged. Subcontractors adapt by submitting cleaner applications and agreeing faster query resolution, knowing that delays risk classing invoices as “in dispute”. Over the first cycle, some payments slip due to data mismatches, but by the second, both sides close gaps and the bulk of invoices clear within the 30‑day target.
Hitting 95% consistently will hinge on clarity around “validity” and “dispute” status. Construction workflows often involve interim applications and certificates, so parties will need to define when the payment clock starts and how queries are raised, tracked and closed. The rule does not, in itself, change agreed retentions or the statutory adjudication framework, but it does increase the pressure to move routine, undisputed sums promptly through the chain. Firms with fragmented systems or manual approvals will face more friction than those with integrated project controls and finance platforms.
# What to watch next
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– How contracting authorities set out start-of-clock rules for “valid” invoices, especially where certification stages apply.
– The extent to which payment performance influences supplier selection, KPIs and in-contract remedies on public frameworks.
– Whether primes increase early verification or reclassify more items as “in dispute” to manage the 95% threshold.
– Uptake of e‑invoicing, standard data fields and supply chain finance to stabilise cashflow while meeting the target.
# Caveats
/> Implementation practices will vary between authorities and sectors, and the detail of contract terms will determine how the rule operates project by project. The definition of “valid and undisputed” leaves room for reasonable verification, which can delay the payment clock if information is incomplete. Private contracts are not directly altered by this change, although any firm delivering public work will need to comply on those projects. This report is an overview, not legal advice; parties should check the terms they are signing.
The direction of travel is tighter, data-backed prompt payment on public works and closer scrutiny of supplier performance. The key question is whether the 95% target can be achieved without pushing more invoices into “dispute” status or shifting risk upstream through longer validation steps.
FAQ
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What is the 95% in 30 days requirement under the Procurement Act?
It is a prompt payment rule linked to public procurement that sets a target for 95% of valid, undisputed invoices to be paid within 30 days. The aim is to speed up cash moving through public sector supply chains and reduce late payment risk.
# Who does the rule apply to in practice?
/> It applies to contracting authorities buying works, goods and services, and to the suppliers they engage on those public contracts. The expectation is that 30‑day terms flow down to subcontractors so the benefit reaches lower tiers in the chain.
# How will compliance be checked or enforced?
/> Compliance is expected to be driven through contract terms, performance monitoring and the information suppliers provide during selection and delivery. Non‑compliance may have commercial consequences, such as weaker scoring in competitions or contractual remedies, depending on what the authority has set out.
# What counts as a “valid and undisputed” invoice in construction?
/> Typically, the clock starts once an invoice matches the agreed data (such as purchase order, pricing and scope) and, where relevant, follows certification or valuation under the contract. If there is a genuine query, the invoice may be classed as “in dispute” until resolved, so clear processes for raising and closing queries are important.
# Does this change private sector timelines or rules on retentions?
/> The change is linked to public procurement and does not, by itself, alter purely private sector contracts. It also does not abolish retentions or change statutory rights such as adjudication; those continue to operate alongside the prompt payment target set for public work.
