Introduction
The UK government has today, 24 March 2026, officially launched the "Time to Pay Up" initiative, marking a fundamental shift in the commercial relationship between major contractors and their supply chains. Designed to tackle a late payment problem that costs the UK economy £11 billion annually, the new measures move the industry from a culture of voluntary "prompt payment codes" to one of strict statutory enforcement.
The reforms, led by the Department for Business and Trade and the Small Business Commissioner, include a mandatory 60-day payment cap and a historic proposal to outlaw the withholding of retention payments in construction contracts. For London’s high-value projects, where cash flow is the primary driver of project stability, this represents the most significant change to payment law since 1998.
What the Late Payment Reform Actually Changes
The core of the 2026 reform is the removal of "strategic" payment delays used by large firms to bolster their own working capital at the expense of SMEs. Under the new laws, all large businesses are restricted to an absolute maximum payment term of 60 days when paying smaller suppliers.
Crucially, the government has announced its intent to ban construction retentions. Historically, main contractors have withheld up to 5% of a contract value, often for years, as security against defects. This practice will be prohibited, ensuring that specialist contractors no longer lose their profit margins to upstream insolvencies or tactical non-payment.
The Regulations Behind the Policy
The new framework builds upon and significantly strengthens the Late Payment of Commercial Debts (Interest) Act 1998.
Key regulatory anchors include:
- Mandatory Statutory Interest: All commercial contracts must now include interest set at 8% above the Bank of England base rate for late payments. This rate is no longer negotiable or subject to "opt-out" clauses.
- Small Business Commissioner (SBC) Powers: The SBC is granted sweeping new powers to investigate poor payment practices, adjudicate disputes outside of court, and levy fines worth tens of millions of pounds against persistent offenders.
- Audit Transparency: Boards and audit committees of large companies will be legally required to publish and explain their payment performance in annual reports, turning payment culture into a formal ESG metric.
By the Numbers
The scale of the "Time to Pay Up" initiative is highlighted by the following data:
- £11 Billion: The estimated annual cost of late payments to the UK economy.
- 38 Businesses: The number of UK firms that fold every day due to payment delays.
- 8% + Base Rate: The non-negotiable statutory interest now applied to all late invoices.
- 60 Days: The new legal absolute cap on payment terms for large firms.
- £10,293: The total now owed on a £10,000 invoice paid just 60 days late (including interest and compensation).
How the New Payment Laws Compare With Previous Rules
| Feature | Pre-2026 Framework | "Time to Pay Up" (2026) |
|---|---|---|
| Payment Cap | No absolute legal cap (often 90–120 days) | Mandatory 60-day absolute cap |
| Interest Rate | Negotiable / Often written out of contracts | Non-negotiable 8% above Base Rate |
| Construction Retentions | Common practice (up to 5% withheld) | Proposed total ban (consultation live) |
| Enforcement | Voluntary / Ombudsman-led | Multi-million-pound fines by SBC |
| Transparency | Private commercial matter | Mandatory board-level annual reporting |
What This Means for Contractors and Developers
The abolition of retentions and the enforcement of the 60-day cap will fundamentally alter project financial modelling.
Main Contractors (Tier 1s) can no longer use supply chain retentions as a buffer for their own cash flow or to offset their own insolvency risks. This may lead to higher upfront project costs and a greater emphasis on rigorous Project Controls and digital verification of work.
Specialist Contractors (SMEs) stand to see an immediate boost in liquidity. However, the law now includes a 30-day invoice verification period; if a client does not dispute an invoice within 30 days, they lose the right to stall. This necessitates "bulletproof" digital evidence of completion to avoid tactical disputes.
Clients and Developers must prepare for a more transparent and legally rigid payment environment. Poor payment performance will now carries reputational risk that could impact their ability to win future public sector work or attract investment.
Evidence-Based Summary
The 2026 payment crackdown represents the end of the "free credit" era in UK construction, shifting the industry from a culture of leverage to one of liquidity. If Tier 1 contractors fail to adapt their cash management strategies to the new 60-day cap and retention ban, then they risk severe financial penalties and a total breakdown of supply chain trust. Success in this new regulatory landscape will depend on digital payment transparency, automated audit trails, and a move toward collaborative procurement.
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Expert Verification & Authorship: Mihai Chelmus
Founder, London Construction Magazine | Construction Testing & Investigation Specialist |
