Unpaid Subcontractor Invoice in Australia: Recovery Steps

You completed the works, submitted the progress claim, and waited. The head contractor accepted the work, used it to invoice the principal, and is now slow-walking your payment with a familiar set of excuses — “we are waiting on the principal”, “your invoice is in the next pay run”, “there is a small variation to sort out”. Meanwhile your suppliers, your crew and your bank do not extend the same forbearance you are being asked to extend upstream.

Australian law gives subcontractors something the head contractor would prefer you did not know about — two parallel sets of recovery rights, each fast, each independently enforceable, and each significantly more powerful than another reminder email.

Why these invoices stall

Subcontractor payments stall because the head contractor has worked out that subbies typically chase informally for months before doing anything formal. Cash sits with the head contractor in the meantime, earning interest or covering other shortfalls. The longer you delay formal action, the more cash they hold and the more confident they become that informality will continue. The pattern reverses the moment a formal step is taken.

The two parallel rights

• Contractual debt-recovery rights. Your subcontract is enforceable. Unpaid invoices for accepted work are debts. Letter of Demand, Final Demand, tribunal or court — the standard sequence applies.
• Statutory rights under Security of Payment legislation. Each state has its own Act (New South Wales 1999, Victoria 2002, Queensland 2017, Western Australia 2021, South Australia 2009 and equivalents). These give you a statutory right to payment for construction work or related goods and services. Pay-when-paid clauses are unenforceable across most of Australia. Adjudication is fast (typically resolved inside 30 to 45 days) and produces an enforceable certificate.

The right legal step to start

A Letter of Demand is the standard contractual first step and works equally well as the precursor to either a small-claims/court route or a SOPA payment claim. It identifies the subcontract, the works performed, the progress claim history, the legal basis for the debt, statutory interest where applicable, and the specific escalation path that will be invoked.

What Claim Done delivers

• Subcontract, scope and progress claim history captured precisely
• Citation of the Security of Payment Act in your state where applicable
• Statutory interest and recovery costs included
• 14-day deadline with named next step
• Drafted and sent as a PDF, flat $49

Common head contractor pushbacks and why they fail

• “Pay-when-paid.” Unenforceable across most of Australia for SOPA-covered construction work.
• “The principal is in dispute.” Their dispute is their problem; your right to payment for work delivered is independent.
• “There are defects.” Defects must be properly notified and quantified; bare assertions do not justify withholding payment for accepted work.
• “You were late.” Delay claims must be raised under the contract; informal grumbles do not defeat a payment claim.

Next escalation if the demand is ignored

Two parallel tracks. The contractual track moves through a Final Demand ($49) and into the small claims tribunal, Magistrates Court, or — for corporate head contractors over $4,000 — a Statutory Demand under section 459E of the Corporations Act 2001. The SOPA track moves through a payment claim, payment schedule (or absence of one), and adjudication, typically resolved inside 30 to 45 days with an enforceable adjudication certificate. Subcontractors who run both tracks in parallel get paid materially faster than those who choose one. A formal Letter of Demand sets the foundation for either route and is the cheapest single step in the recovery arsenal.