Subcontractor Payments

Subcontractors are businesses or individuals engaged by a head contractor or principal contractor to perform a portion of the work under a construction, services, or project contract. Subcontractor payments are the invoices and payments flowing from the head contractor to the subcontractor for the work performed. While structurally similar to standard supplier payments, subcontractor payments in the Australian construction industry carry specific legal obligations -- primarily under SOPA and TPAR -- that make them significantly more regulated than ordinary trade payables.

The head contractor's obligations to subcontractors are not purely commercial. The Security of Payment Act requires that valid payment claims are formally responded to within statutory timeframes; failure to respond results in the claimed amount becoming immediately payable regardless of dispute. The Taxable Payments Annual Report requires that all payments to subcontractors with ABNs are reported to the ATO annually. Some jurisdictions require that retention withheld from subcontractors is held in a separate trust account. And the superannuation guarantee may apply to labour-only subcontractors regardless of their ABN status.

Managing the subcontractor payment workflow

Subcontractor payment management in construction requires a workflow that integrates with both the contracts team and the site team. A payment claim arrives from the subcontractor; the contracts team or quantity surveyor assesses the claim against the work actually completed; a payment certificate is issued confirming the amount approved; the AP team processes the payment against the certificate (not against the original claim, which may differ). Any amount withheld as retention is tracked separately against the subcontractor's account.

This workflow is more complex than standard AP processing but is essential. AP teams that pay subcontractor claims at the claimed amount without a payment certificate process are paying without independent verification of the work claimed -- creating overpayment risk and SOPA compliance risk (because paying an incorrect amount may not satisfy a valid payment claim under the Act). Conversely, AP teams that hold payment beyond the SOPA response period because the workflow has not been completed create a different legal exposure: the unchallenged claim becomes a statutory debt.

Subcontractor payment performance in the industry

Late payment to subcontractors is a systemic issue in the Australian construction industry. The Australian Small Business and Family Enterprise Ombudsman (ASBFEO) has repeatedly reported that subcontractors wait on average 57 days for payment from head contractors, despite typical contract terms of 30 days. The Prompt Payment Protocol, developed with industry bodies, has had limited success in changing payment culture. Queensland's Building Industry Fairness Act and similar legislation in other jurisdictions are attempting to address the problem through mandatory trust accounts and increased enforcement rather than voluntary codes -- which indicates how embedded the late payment culture has become and how much process improvement opportunity exists for head contractors who choose to differentiate on payment performance.