Payment Application

A payment application - sometimes called an application for payment (AfP) or pay app - is a formal written request made by a contractor or sub-contractor to the party responsible for payment, claiming the value of work completed or materials stored on site during a defined period. Unlike a standard commercial invoice, a payment application in the UK is governed by the Housing Grants, Construction and Regeneration Act 1996 (the Construction Act), which sets mandatory timelines for payment notices, pay less notices, and dispute resolution across all qualifying construction contracts.

How the Payment Application Process Works

When a contractor submits a payment application, the paying party - whether the client or main contractor - must respond within a statutory window. Under a standard JCT contract, the payer must issue a Payment Notice within five days of the date the payment becomes due. That notice either confirms the sum the payer intends to pay or sets out an alternative valuation.

If the payer wants to pay less than the notified sum - because the work is incomplete, defective, or there are contra charges to apply - they must issue a Pay Less Notice before the final date for payment. Courts have consistently enforced these requirements strictly. A payer who misses the Pay Less Notice deadline loses the right to dispute the notified sum for that application, even if genuine defects exist.

Payment applications are typically submitted monthly on projects lasting over 45 days. For sub-contractors, the default Scheme for Construction Contracts sets the relevant period at 28 days, with payments due seven days after the period ends and a final date for payment 17 days after the due date.

Payment Applications vs. Invoices

Contractors and sub-contractors in construction use both documents, but they serve different purposes. A payment application creates the legal right to be paid under the construction contract. An invoice is issued for VAT and accounting purposes, typically once the paying party has certified or confirmed the sum due.

Issuing a VAT invoice without first serving a valid payment application - where one is contractually required - does not trigger the statutory payment machinery. In practice, many sub-contractors serve the application, wait for a certified amount, and then issue the corresponding VAT invoice to match the certified figure.

For businesses managing multiple sub-contractors across a live project, tracking which applications have been submitted, which Payment Notices have been received, and which Pay Less Notices are outstanding is a material cash flow risk. A missed Pay Less Notice deadline means receiving less than the value of work done with no immediate recourse.

Zigaflow's invoicing and job management tools allow construction businesses to record payment applications against live jobs, track certified amounts, and link received payments back to individual contracts - giving project managers and finance teams a single view of what has been claimed, certified, and paid on every active project.