UK's Toughest Late-Payment Law Lands in 2026: SME Guide

If you've spent the past three years chasing the same large general contractor for the same retention release on the same finished job, the March 2026 late-payment package was written for you. Direct Line's industry data put the average UK tradesperson chasing £6,210 in late payments across an average of seven outstanding invoices, with 81% of tradespeople reporting they are routinely chasing money. The Government Response to the Late Payment Consultation, published on 24 March 2026, claims to make the UK the 'toughest in the G7' on late payment. For Derbyshire and Midlands SME builders, plumbers, electricians and recruitment agencies, the reform genuinely shifts the leverage — but only if you've updated your contract, invoicing and ledger discipline to use it.

What's actually changing — the three pieces that matter

The reform has three operational pieces SME contractors should know cold. First, a 60-day maximum payment-terms cap on invoices issued by small suppliers to large firms (defined under the Companies Act size thresholds). Second, mandatory statutory interest at 8% above the Bank of England base rate on late payments — automatic, not discretionary. Third, a significantly strengthened Small Business Commissioner with investigatory and enforcement powers, including financial penalties on persistent late payers reportedly scaling into tens of millions of pounds. Charles Russell Speechlys' April 2026 commentary and Mayer Brown's March 2026 client briefing both flag the same direction of travel.

What an SME builder should change in their contract pack

1. Update standard payment terms

Re-draft every supplier and subcontractor agreement so payment terms are no more than 60 days from invoice date (or from satisfactory completion under construction-industry practice). If you're working under JCT, NEC4 or bespoke contracts, get the schedule amended for any new instructions or framework calls signed from 2026 onwards. If a customer pushes back on 60 days as 'commercially unusual', the legal answer is now 'no — it's the statutory ceiling'.

2. Auto-apply statutory interest

Statutory interest under the new regime is automatic, but it doesn't appear in the customer's accounts payable system unless your invoice template makes it visible. Add a line item to every invoice that names the statutory rate (currently 8% above base = roughly 12.5% in mid-2026), the due date, and the auto-apply clause. This means the customer's AP team sees the meter ticking from day 61, not just after a debt-collection email.

3. Build a Small Business Commissioner escalation path

Add a clause referencing the Small Business Commissioner's complaints route as the next step after a single chase letter. The strengthened SBC can now investigate, mediate, and impose penalties on persistent offenders. Mentioning this on your second chase email materially changes the customer's calculation. Travers Smith's 2026 briefing notes that early indications suggest large customers are pre-emptively cleaning up payment practice to avoid SBC scrutiny.

4. Move retention to a separate ledger

Construction retention is a special case — typically 3-5% held for a defects period, then released. The 60-day cap doesn't necessarily apply to a retention release if your contract sets a different mechanism. But the new regime is a chance to renegotiate retention out altogether, or move it to a separate ledger where you can age, chase and escalate retentions specifically. Designing Buildings' May 2026 commentary on retention reform makes the case that 2026 is the moment to retire one-size-fits-all retention.

What the new directors'-report disclosure means for your big customers

Separately from the 60-day cap, large companies must now include payment practices disclosures in their Directors' Reports for financial years beginning on or after 1 January 2026 — alongside the existing twice-yearly portal reporting. This means your customer's auditors will ask their AP team for an explanation of every overdue ledger position before the report goes to print. Use this in your negotiating position: if you're 90 days late paying a Derbyshire subcontractor, that's going to land in your directors' report and your auditors will ask about it. SMEs in the construction supply chain who reference the disclosure rule in chase letters are getting faster responses.

“The UK is now positioning itself as having the toughest anti-late-payment laws within the G7, reinforcing the government's commitment to supporting SMEs against delayed settlements from larger commercial clients.”

The Derbyshire / East Midlands SME shopping list — this quarter

Where Kirk Group and its agency-back-office model fit

One of the recurring pain points contractors raise — and one of the reasons we run a vetted agency model rather than a job-board pay-per-lead model — is that an agency back-office is structurally better placed to handle 60-day terms, statutory interest, retention and chasing than a sole-trader is. When you place via Kirk Group, the AR risk on the placement sits with the agency, not with you. You're paid weekly out of our ledger, and we hold the receivable against the client. For a Derbyshire SME builder running 8-15 placements at a time, this is the difference between waiting 80 days for project payment and paying contractors weekly out of cash flow.

We're seeing more Derbyshire and East Midlands SME builders fold their direct contractor management into an agency model in 2026, specifically to remove the late-payment risk from their own balance sheet. The 60-day cap helps everyone — but the agency model converts a 60-day risk into a same-week payment to the contractor and a 60-day exposure on the agency's much larger working-capital base.