Late Payments Bill moves forward: contract and cashflow impacts for UK project teams
Reviewed by Tom Sullivan

First reported on The Construction Index
30 Second Briefing
The UK government is introducing the Small Business Protections Bill (Commercial Payments Bill) to parliament, imposing a statutory 60‑day cap on payment terms for large firms and mandatory interest on late payments to smaller suppliers. The bill grants the Small Business Commissioner new powers to investigate, adjudicate and levy fines worth tens of millions of pounds on persistent late payers. For construction, a planned ban on cash retentions could significantly alter contract structures, cashflow management, and security arrangements for defects and incomplete works.
Technical Brief
- Statutory framework will outlaw construction cash retentions entirely, forcing alternative defect-security mechanisms in contracts.
- Removal of retentions shifts quality assurance towards performance bonds, parent guarantees and more rigorous completion criteria.
- Stronger cashflow certainty for specialist geotechnical and tunnelling subcontractors reduces insolvency-driven safety risks on long programmes.
- Enhanced powers for the Small Business Commissioner introduce quasi-regulatory oversight of commercial payment behaviour on sites.
- Fines “worth tens of millions” create a material financial risk item for tier‑one contractors’ governance systems.
- More predictable payment cycles enable better resourcing of site supervision, inspections and safety-critical maintenance.
- Design-and-construct contracts may need revised risk allowances and pricing models to reflect loss of retention leverage.
Our Take
The related 24 March 2026 policy piece on banning construction retentions and enforcing 8%+ base rate late-payment interest suggests this 60‑day cap is part of a wider UK push to de‑risk cashflow for small contractors in the supply chain.
The Small Business Commissioner’s repeated appearance in our UK policy coverage signals that enforcement and dispute resolution around payment practices are likely to become more formalised, which could influence how standard forms of contract allocate payment and interest provisions.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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