Unpaid Subcontractor Invoice: How to Recover Payment in the Building Industry

You completed the job. You sent the invoice. Weeks pass. The head contractor ignores your calls. The developer claims cash flow issues. Meanwhile, your suppliers are chasing you for payment.

Unpaid subcontractor invoices are a chronic problem in the Australian building industry. Subcontractors have stronger legal protections than most other creditors — including fast-track adjudication under security of payment legislation, statutory demands that can wind up insolvent companies, and tribunal claims that bypass expensive court proceedings.

Why subcontractors get stung

The construction payment chain is long and fragile. Money flows from the property owner to the head contractor, then down through multiple layers of subcontractors and suppliers. When one link breaks, subcontractors at the bottom suffer first.

Common scenarios:

• Progress claims rejected without valid reason — the head contractor disputes work quality or claims a variation was not approved
• Retention amounts withheld indefinitely — retention money held “for defects” but never released
• Insolvency upstream — the head contractor enters administration, leaving unpaid invoices behind
• Phoenix activity — a company winds up owing money, then the same directors start a new entity
• Deliberate delay tactics — paying other creditors first, knowing subcontractors have limited resources to chase payment

Head contractors and developers have legal teams and cash reserves. Subcontractors often operate on thin margins and cannot afford to wait months for payment or spend tens of thousands on litigation.

Security of payment laws: your first weapon

Every Australian state and territory has security of payment legislation designed to keep cash flowing through construction projects. These laws give subcontractors the right to fast-track adjudication — a process that delivers a binding payment determination in 10-15 business days, without going to court.

The legislation varies by state, but the framework is similar across jurisdictions. You serve a payment claim on the head contractor. If they do not pay or serve a valid payment schedule within the statutory timeframe (typically 10-15 business days), you can apply for adjudication. An independent adjudicator reviews the claim and issues a determination, which is enforceable as a judgment debt.

Key advantages of adjudication:

• Fast — determination within 10-20 business days
• Affordable — adjudication fees typically $3,000-$8,000, split between parties
• Binding — the head contractor must pay the determined amount, even if they intend to dispute it later
• No court proceedings required

When to use it:

• The contract qualifies as a “construction contract” under the relevant state Act
• Your payment claim complies with the Act’s formal requirements
• The head contractor has not paid or has issued an inadequate payment schedule
• The amount is worth pursuing (adjudication is cost-effective for claims over $10,000)

Security of payment adjudication does not resolve the underlying dispute permanently. The head contractor can still commence court or arbitration proceedings to challenge the determination. But in practice, most determinations are paid and never challenged.

Statutory demands: the nuclear option for company debtors

If the head contractor or developer is a registered company (Pty Ltd or Ltd), and they owe you $4,000 or more, you can serve a statutory demand under the Corporations Act.

A statutory demand is a formal notice requiring the company to pay the debt within 21 days — or face presumed insolvency and potential wind-up proceedings. It is the most powerful debt recovery tool available against a company debtor.

Requirements:

• Minimum debt of $4,000
• Debt must be liquidated (a specific amount, not estimated damages)
• Debt must not be genuinely disputed
• Demand must be in the prescribed form
• Demand must be accompanied by an affidavit verifying the debt

What happens after you serve it:

The company has three options:

1. Pay the debt — most companies pay within the 21 days to avoid insolvency proceedings
2. Apply to set aside the demand — if they claim the debt is genuinely disputed or there is an offsetting claim, they can apply to the court within 21 days
3. Do nothing — after 21 days, the company is presumed insolvent, and you can apply to wind it up

Why it works:

Directors hate statutory demands. A demand on the public record signals financial distress to banks, suppliers, and clients. If the company is genuinely insolvent, the demand accelerates the inevitable. If the company is solvent but refusing to pay, the demand forces them to either pay up or spend significant legal fees to set it aside.

When not to use it:

• The debt is genuinely disputed (the company will successfully set aside the demand)
• The company is already in administration or liquidation
• You are owed less than $4,000
• The debtor is an individual or sole trader (statutory demands only apply to companies)

Tribunal claims: affordable court alternative

If adjudication is not available and a statutory demand is not appropriate, you can file a claim in your state’s civil tribunal.

Tribunal claim limits vary:

• NSW: NCAT — $30,000 (no lawyers required)
• VIC: VCAT — $10,000 (no lawyers required)
• QLD: QCAT — $25,000 (no lawyers required)
• WA: Magistrates Court (small claims) — $10,000
• SA: SACAT — $12,000
• TAS: Magistrates Court (small claims) — $5,000
• ACT: ACAT — $10,000
• NT: Local Court — $25,000

Tribunals are designed for self-represented parties. Filing fees are low ($100-$500), procedures are informal, and hearings are typically scheduled within 3-6 months. You do not need a lawyer, although you can engage one if the amount justifies it.

What you need to prove:

• You performed the work or supplied the materials
• The work complied with the contract (or any defects were minor)
• You invoiced the debtor correctly
• The debtor has not paid

Evidence to bring:

• Signed contract or purchase order
• Scope of work or specifications
• Invoices and payment records
• Correspondence (emails, texts) showing the debtor acknowledged the debt
• Photos or reports proving work was completed
• Witness statements from other subcontractors or site supervisors

Tribunals have broad powers to award judgment, interest, and costs. Once you have a tribunal order, you can enforce it through garnishment, property seizure, or bankruptcy proceedings.

The letter of demand: where every claim starts

Before adjudication, statutory demands, or tribunal claims, send a formal letter of demand. A letter of demand is a written notice requiring payment within a specified timeframe (typically 7-14 days) and outlining the consequences of non-payment.

What it achieves:

• Demonstrates you are serious about recovering the debt
• Provides a clear deadline, prompting immediate payment
• Satisfies pre-action requirements for tribunal and court proceedings
• Creates a paper trail showing the debtor was given a fair opportunity to pay

What to include:

• Summary of the work performed and invoice details
• Amount owed (principal, interest, costs)
• Payment deadline (7-14 days)
• Consequences of non-payment (adjudication, statutory demand, tribunal claim, or court proceedings)
• Reference to the applicable legislation

Protecting yourself on the next job

Recovering unpaid invoices is stressful and time-consuming. Prevention is better than cure.

Steps to reduce payment risk:

• Check the head contractor’s financial position — search ASIC for any insolvency history or director bans
• Use a written contract — clearly define scope, payment terms, retention, and dispute resolution
• Invoice promptly — serve payment claims in strict compliance with security of payment legislation
• Claim retention on time — do not let retention periods expire
• Register a security interest — use the Personal Property Securities Register (PPSR) to secure payment against materials you supply
• Consider trade credit insurance — insures you against non-payment by insolvent debtors
• Walk away from bad clients — if a contractor has a reputation for non-payment, the job is not worth it

How ClaimDone helps subcontractors recover unpaid invoices

ClaimDone is built for subcontractors who need legal-style documents fast, without paying hourly lawyer fees.

Letter of Demand — $79 flat fee. Upload your invoice and evidence. Our Proprietary AI Engine drafts a professionally formatted letter citing the applicable security of payment legislation and Australian Consumer Law, and delivers it automatically to the debtor.

Statutory Demand — $197 flat fee. For company debtors owing $4,000+. We prepare the statutory demand form and the supporting affidavit template, ready for you to swear and serve.

Tribunal Application — $197 flat fee. We prepare the application, statement of claim, and evidence summary for filing in your state tribunal.

Every document is generated by ClaimDone’s Proprietary AI Engine, which reads your evidence and applies Australian law. No subscription. No hourly billing. Done in 60 minutes.

Take action now

The longer you wait, the harder it gets. Head contractors go into administration. Directors start phoenix companies. Evidence disappears.

If you are owed money for work completed, act now. Start with a letter of demand to give the debtor 7 days to pay. If they ignore it, consider adjudication if your contract qualifies under security of payment legislation, or serve a statutory demand if the debtor is a company owing $4,000 or more. For smaller debts or non-company debtors, file a tribunal claim.

Prepare a statutory demand under the Corporations Act with ClaimDone and get the debtor’s attention in 21 days.

Frequently Asked Questions

Can I use a statutory demand for an unpaid subcontractor invoice?

Yes, if the debtor is a registered company (Pty Ltd or Ltd) and owes you $4,000 or more. A statutory demand under the Corporations Act gives the company 21 days to pay or face wind-up proceedings. It is one of the most effective debt recovery tools for subcontractors dealing with company debtors.

What is security of payment adjudication?

Security of payment adjudication is a fast-track process under state legislation that allows subcontractors to recover payment without going to court. You serve a payment claim, and if the head contractor does not pay or issue a valid payment schedule, you apply for adjudication. An independent adjudicator reviews the claim and issues a binding determination within 10-20 business days.

How long do I have to chase an unpaid invoice?

In most Australian states, the limitation period for debt recovery is six years from the date the debt became due. However, waiting reduces your chances of recovery — debtors become insolvent, evidence is lost, and memories fade. Start recovery action within 60-90 days of the invoice due date.

Can I claim interest on an unpaid subcontractor invoice?

Yes. If your contract includes an interest clause, you can claim the agreed rate. If there is no contract term, you can typically claim interest under the relevant state legislation. Tribunal and court judgments also attract post-judgment interest until the debt is paid.

What if the head contractor claims the work was defective?

If the head contractor raises a genuine dispute about defects, you may need to provide evidence that the work complied with the contract or that any defects were minor and do not justify withholding full payment. Security of payment adjudication allows you to recover payment even if there is a dispute — the adjudicator will determine what amount is payable based on the evidence.