What are JCT Clause 4 payment amendments? JCT Clause 4 amendments are bespoke modifications inserted into a subcontract Schedule of Amendments to alter standard payment timing and administration. In the JCT Design and Build Subcontract (DBSub/C), some bespoke amendments may alter the standard 12-day interval between the Interim Valuation Date and the Due Date, lengthen the Final Date for Payment, or impose restrictive administrative pre-conditions on applications.
Before entering into a commercial subcontract, examining Section 4 is essential. While unamended JCT forms provide a structured timeline for cash flow, some bespoke amendments may alter payment dates, notice periods, or documentation requirements to reallocate working capital obligations across the supply chain.
Agreeing to amended payment provisions without assessing their commercial impact can require your business to finance labour and plant costs for extended periods before payment falls due. Below, I set out how standard JCT DBSub/C payment clauses operate, amendments encountered in practice, and practical methods to evaluate your risk.
1. Technical Authority: JCT DBSub/C 2016 Payment Framework
In unamended JCT Design and Build Subcontract (DBSub/C 2016) terms, interim payment procedures are established within Section 4:
- Due Date & Applications (Clause 4.6): The Due Date is established in Clause 4.6 and is standardly 12 days after the relevant Interim Valuation Date (IVD). Clause 4.6 also regulates the subcontractor’s payment applications and the rules determining sums due. However, the signed Sub-Contract Particulars, bespoke amendments, and the date on which an application is submitted can affect this calculation.
- Final Date for Payment & Notices (Clause 4.7): Under unamended DBSub/C 2016 conditions, Clause 4.7 establishes the Final Date for Payment as 14 days from the Due Date. Clause 4.7 also governs the notice provisions, including the Contractor’s Payment Notice and the Pay Less Notice procedure, specifying a 5-day period prior to the Final Date for Payment in the unamended form, subject to any amendments in the signed subcontract.
- Right of Suspension (Clause 4.8): Clause 4.8 addresses the subcontractor’s contractual and statutory right to suspend performance where sums properly due remain unpaid past the Final Date for Payment, subject to formal notice requirements.
- Calculation of Interim Payments (Clauses 4.9 & 4.10): Detail the substantive valuation rules, including work executed, site materials, and applicable adjustments.
2. Payment Amendments Encountered in Practice
1. Lengthened Payment Cycles (45 to 90 Days)
Some bespoke amendments may extend payment terms by altering the 12-day IVD-to-due-date interval or replacing the unamended 14-day period between the Due Date and the Final Date for Payment with 45, 60, or 90 days. A long payment term is not automatically lawful or unlawful purely because it was agreed; its validity depends on whether it provides an adequate payment mechanism under Section 110 of the Construction Act and complies with statutory controls against grossly unfair terms under late-payment legislation.
2. Additional Documentary Pre-conditions
Some bespoke amendments may seek to add documentary requirements to payment applications, such as mandatory signed allocation sheets, progress photos, or quality sign-offs. Whether failing to provide a particular document invalidates an application depends on whether the bespoke drafting creates a legally effective condition precedent and complies with statutory payment notice rules.
3. Altered Notice Windows
While unamended DBSub/C 2016 terms provide a standard notice framework, some bespoke amendments may alter notice periods. Reducing the period before the Final Date for Payment within which a Pay Less Notice can be served limits the time available to evaluate and challenge proposed deductions.
3. Commercial Considerations and Cash Flow Management
Agreeing to extended payment provisions introduces specific commercial considerations:
- Timing of Statutory Suspension: Under Section 112 of the Construction Act, the right to suspend performance arises only when a sum properly due is not paid by the Final Date for Payment and at least seven days’ notice of intention to suspend has been served in accordance with the applicable requirements. Suspending work prior to the contractual final date carries substantial legal and commercial risk.
- Funding Working Capital: Lengthened payment windows may require bridging finance or commercial facilities to fund weekly labour and supplier accounts, which can lead to subcontract revenue loss.
- Insolvency Considerations: While Section 113 of the Construction Act prohibits “pay-when-paid” clauses generally, it contains a specific statutory exception where an upstream party becomes insolvent as defined under subsections (2) to (5). Extended payment cycles increase the timeframe during which trade contractors bear credit exposure to upstream insolvency risks.
Frequently Asked Questions: Subcontract Payment Rules
What is the standard interval between the IVD and the Due Date in JCT DBSub/C 2016?
Under unamended JCT DBSub/C 2016 (Clause 4.6), the Due Date for an interim payment is standardly 12 days after the relevant Interim Valuation Date (IVD). However, the signed Sub-Contract Particulars, bespoke amendments, and the timing of your application can affect this calculation.
Which JCT DBSub/C 2016 clauses govern interim payment due dates, final dates, and notices?
Under unamended JCT DBSub/C 2016, Clause 4.6 governs the Due Date, payment applications, and sums due; Clause 4.7 governs the Final Date for Payment, the Contractor’s Payment Notice, and Pay Less Notice requirements; and Clause 4.8 sets out the subcontractor’s right of suspension.
Are 60-day or 90-day payment terms legally enforceable?
Sections 109 and 110 address stage payments and payment mechanisms. Section 110 requires an adequate payment mechanism. Agreed payment terms may also be subject to the Late Payment of Commercial Debts (Interest) Act 1998 rules on grossly unfair terms.
When does a trade subcontractor have the right to suspend work under Section 112?
Under Section 112 of the Construction Act, the right to suspend performance arises when a sum properly due is not paid in full by the final date for payment and at least seven days’ notice of intention to suspend has been served in accordance with the applicable requirements.