Can Offsetting Claims Defeat a Subcontractor's Statutory Demand in QLD?

Q: Is it easy to set aside a statutory demand based on a BIF Act adjudication?

Challenging a statutory demand based on a BIF Act adjudication certificate is notoriously difficult. Because the certificate constitutes a statutory judgment debt, raising a genuine dispute about the underlying contract merits usually fails, as courts are unlikely to let respondents re-litigate the adjudicator's decision.

John Merlo
4 hours ago
12 min read

Key Takeaways

A head contractor has a strict 21-day period to apply to set aside a statutory demand; missing this deadline typically results in a presumption of insolvency.
Contractual back-charges and liquidated damages can often be leveraged as an offsetting claim to reduce the demanded debt below the statutory minimum.
Statutory demands based on a Building Industry Fairness (Security of Payment) Act 2017 (BIF Act) adjudication certificate are notoriously difficult to challenge, as courts are unlikely to entertain a genuine dispute over the underlying contractual merits.
Minor typographical errors in a demand rarely justify setting it aside unless they cause substantial injustice to the head contractor.

The subcontractor who walked off your Brisbane site three months ago, leaving you with $80,000 in rectification costs, has just served a statutory demand for their final $50,000 progress claim. If you ignore this document, your head contracting company will be presumed insolvent in exactly 21 days, giving the subcontractor leverage to apply to wind up your business, trigger cross-defaults on your other active projects, and jeopardise your QBCC licence. Rather than rushing to pay a debt you commercially dispute, you can push back with a considered legal strategy. This article sets out how head contractors can use site records, back-charges, and liquidated damages as offsetting claims to potentially defeat the demand and protect the company. In practice, your defences fall into a clear order of preference: first, an offsetting claim that reduces the debt below the statutory minimum; second, a genuine dispute about whether the debt exists at all; and third, a technical defect in the demand itself. This article works through each in turn.

The 21-Day Clock and Your Immediate Defence Choices

Your commercial team is understandably furious that a subcontractor who caused actual project losses is now threatening your business with liquidation. However, anger will not stop the clock, and you have exactly 21 days to take formal legal action. This section provides the critical deadlines, procedural mechanisms, and the severe legal presumptions your company is currently operating under.

The Strict 21-Day Window Under Section 459G

When a statutory demand lands on your desk, the timeline to respond is unforgiving. A company has a strict 21-day period from the date of service to apply to the court to set aside a statutory demand, as established under section 459G of the Corporations Act 2001 (Cth), which governs all Queensland registered companies.

In Queensland, an application to set aside a statutory demand must be filed and served within a strict 21-day period from the date of service.

This 21-day deadline is absolute. The binding High Court authority in David Grant & Co Pty Ltd v Westpac Banking Corporation confirmed that courts have no jurisdiction to extend this timeframe. Serving the application on the creditor is just as critical as filing it in court; if both steps are not completed before the 21 days expire, your right to challenge the demand is permanently extinguished.

Separating Corporations Act Insolvency Presumptions from Contractual Dispute Merits

To effectively respond to a statutory demand, head contractors must distinguish between the procedural mechanism driving the insolvency threat and the substantive contractual dispute over the construction work. A statutory demand is not a tool for finalising who breached the subcontract or quantifying the exact value of a variation.

Instead, the demand initiates a procedural pathway under the Corporations Act designed to test solvency. When you apply to the Supreme Court to set the demand aside, the judge is not running a mini trial to determine the final merits of your construction dispute. The court’s role is solely to assess whether a genuine dispute or offsetting claim exists. If you can prove that the debt is genuinely contested, the court will typically halt the insolvency process and force the subcontractor to prove their progress claim through standard civil litigation or adjudication.

Failure to Comply Under Section 459F and the Presumption of Insolvency

Miss the 21-day deadline and the consequences for a head contractor are severe. Under section 459F of the Corporations Act, if the demand is still in effect at the end of the compliance period and the company has not complied, the company is taken to have failed to comply with it. That failure then enlivens a presumption of insolvency under section 459C, which the subcontractor can rely on to commence winding-up proceedings.

Once the company is presumed insolvent, the subcontractor can file an application to wind up your business. A failure to set aside a statutory demand often enlivens significant head contractor insolvency Queensland risk. Furthermore, allowing the company to reach this presumed insolvency state may create separate exposure channels for directors, as allowing the company to incur further debts can trigger severe insolvent trading risk and personal liability.

Using Liquidated Damages and Back-Charges as Offsetting Claims

The fastest way to neutralise a subcontractor's statutory demand is often to prove they actually owe your company money. By deploying an offsetting claim for defect rectification or delay damages, you move from simply resisting the demand to actively challenging it, potentially reducing their demanded debt below the statutory minimum.

The Statutory Demand Test for an Offsetting Claim Under Section 459H

An offsetting claim is a powerful evidentiary tool that head contractors can use to defend against aggressive debt recovery. Section 459H of the Corporations Act provides the legal framework for asserting these claims, stipulating that a demand can be set aside if there is a genuine dispute between the company and the respondent.

Under section 459H, an offsetting claim can be used to set aside a statutory demand where the counter-claim reduces the admitted debt below the statutory minimum.

When an offsetting claim is pleaded, the court undertakes a specific calculation under section 459H. It determines the substantiated amount by subtracting your offsetting claim from the debt listed in the subcontractor's demand. To successfully set aside the demand under section 459H(3), the remaining balance after this deduction must fall below the statutory minimum, being the same threshold that section 459E requires a debt to meet before a demand can be issued against a Queensland company.

Quantifying Contractual Back-Charges to Exceed the Demanded Debt

To successfully rely on back-charges as an offsetting claim, the claim must be genuine, quantified, and supported by concrete evidence. Head contractors cannot simply point to a vague intention to bring a building-defect claim as a tactical manoeuvre to delay the insolvency process.

The court will scrutinise the evidence supporting the back-charge for subcontractor defects, and in practice the timing of the back-charge is the first thing that gets attacked. A back-charge that appears for the first time in your set-aside affidavit, with no contemporaneous defect notice and no trail in the project correspondence, reads to a judge as a number reverse-engineered to sit just above the demanded debt. That is precisely the impression you cannot afford to create.

What tends to survive scrutiny is a back-charge that was already alive on the project before the demand landed. Think dated non-conformance reports, a superintendent's direction to rectify, quotes or tax invoices from the substitute trade, and a running quantum that matches those documents rather than a round figure. Where the rectification is still in progress, a fixed-price quote from the incoming contractor generally carries more weight than an internal estimate on your own letterhead.

The common own-goal is over-claiming. Directors often instruct that the offsetting claim be pushed as high as possible, but an inflated or loosely evidenced figure invites the subcontractor to argue the whole claim is manufactured. It is usually more defensible to advance a conservative, fully documented number that still clears the statutory minimum than a large figure that collapses the moment it is tested.

It is highly recommended that directors engage a commercial lawyer in Queensland early in the 21-day period to assess whether the evidentiary record supports a robust offsetting claim.

Using Site Superintendent Records to Substantiate Liquidated Damages

Delay damages frequently provide the foundation for a substantial offsetting claim in commercial construction disputes. Consider a scenario where a subcontractor serves a $50,000 statutory demand for unpaid progress claims on a Gold Coast commercial build. The head contractor can apply to set aside the demand by presenting site superintendent delay notices that substantiate a $75,000 offsetting claim for liquidated damages under the subcontract. Because that offsetting claim ($75,000) comfortably exceeds the demanded debt ($50,000), the statutory demand is likely to be set aside entirely.

However, liquidated damages clauses are not an absolute protection against demands. The enforceability of this clause depends on whether the subcontractor has a valid extension of time claim or can mount a prevention principle argument. If the superintendent failed to assess the subcontractor's delay claims, the court may find that the right to apply liquidated damages is genuinely disputed, which may complicate the offsetting claim strategy.

Alternative Grounds to Set Aside a Subcontractor's Demand

If an offsetting claim cannot be clearly quantified within the strict 21-day window, head contractors must scrutinise the primary debt itself. This is the second tier of the defence hierarchy: where you cannot reduce the debt with a counter-claim, you instead attack whether the debt is genuinely owed at all. Challenging the validity of the debt, or identifying critical defects in the subcontractor's demand documentation, forms your secondary line of defence against the insolvency threat.

Proving a Genuine Dispute About the Debt's Existence

To set aside a statutory demand, a head contractor can demonstrate that there is a genuine dispute regarding the underlying debt. A court assessing a genuine dispute argument does not conduct a full trial to determine the final contractual rights of the parties; rather, it assesses whether the dispute is bona fide and grounded in a plausible factual reality.

Establishing a genuine dispute requires showing a plausible factual basis for denying the debt, rather than proving the final outcome of the contractual disagreement.

For instance, if the subcontractor claims a milestone payment, but the head contractor can present site records showing the milestone was never achieved, a genuine dispute is likely to exist. Courts typically require the dispute to be more than a mere assertion or a spurious objection conjured up to delay payment. If the court is satisfied that a serious question to be tried exists regarding the debt's validity, it can order that the demand be set aside.

Why Challenging BIF Act Adjudication Certificates Usually Fails

The evidentiary landscape changes dramatically if the subcontractor's statutory demand is based on an adjudication certificate under the Building Industry Fairness (Security of Payment) Act 2017 (Qld). Because an adjudication certificate can be filed in court as a statutory judgment debt, raising a "genuine dispute" about the underlying contractual merits usually fails.

Courts are highly reluctant to allow a respondent to re-litigate the merits of an adjudication decision through a set aside statutory demand contractor application, and the reason is structural. Once the adjudication certificate is filed as a judgment, the demand is no longer built on a contested progress claim; it is built on a judgment debt. Arguing that the adjudicator got the contract wrong is, in substance, an attack on that judgment, and a set-aside application under Part 5.4 of the Corporations Act is not the forum to mount it

The practical mistake is treating the set-aside application as a second bite at the adjudication. It rarely works. If you genuinely say the adjudicator exceeded jurisdiction or denied you natural justice, that is a judicial review argument brought in its own right, not a "genuine dispute" raised in answer to the demand.

That leaves two realistic paths. The first is to run an offsetting claim that was not, and could not have been, dealt with in the adjudication, such as a back-charge or liquidated damages claim outside the scope of the payment claim decided. The second is the harder commercial reality: where no independent offsetting claim exists, many head contractors end up paying the certified sum to kill the insolvency threat and then pursuing recovery through final contractual proceedings, where the merits can be re-opened. The BIF Act regime is deliberately "pay now, argue later", and a statutory demand backed by a certificate is where that design bites hardest.

Substantial Injustice and Minor Defects Under Section 459J

When a genuine dispute or offsetting claim is unavailable, head contractors sometimes look for technical flaws in the demand documentation. However, the Corporations Act requires a high threshold before a procedural defect will invalidate the demand. Under section 459J, a court may set aside a statutory demand if a defect in it will cause substantial injustice, or if there is "some other reason" to do so.

A common misconception among directors is that a minor typographical error, such as a slightly misspelled company name or an incorrect date on an attached invoice, automatically voids the demand. This is incorrect. The court evaluates whether the defect actually confused the debtor or prevented them from understanding the nature of the claim. Unless the head contractor can demonstrate that the defect caused a substantial injustice—for example, by fundamentally misstating the debt amount such that a response is impossible—the demand will typically remain enforceable.

Commercial Settlement Versus Supreme Court Application

Litigating in the Supreme Court to set aside a demand is a significant commercial commitment. Before filing the application and incurring those costs, directors must weigh the commercial realities of settling the debt against the evidentiary strength of their offsetting claims, while never losing sight of the 21-day deadline.

Essential Evidence to Gather Before Filing a Section 459G Application

To instruct lawyers to draft a robust set-aside application, a head contractor must act immediately upon receiving the demand. The strict 21-day window leaves no room for extensive evidence discovery, meaning your commercial team must rapidly compile the relevant project records.

Preparing a Supreme Court application to set aside a statutory demand requires immediate assembly of all site records, defect notices, and superintendent directions. Use the following as a rapid 21-day evidence checklist:

Compile the executed subcontract, including all specific conditions, variations, and flow-down clauses.
Collate all progress claim correspondence, including the disputed claim and your payment schedules or withholding notices.
Gather formal defect notices, non-conformance reports, and superintendent directions issued to the subcontractor.
Prepare detailed quantum calculations for any back-charges, including third-party invoices for substitute trades or materials.
Assemble program records and delay notices if claiming liquidated damages as an offsetting claim.

Negotiating a Withdrawal Before the Court Filing Deadline Expires

Once your evidentiary record is compiled, a strategic option is to present the draft set-aside application and offsetting claim evidence to the subcontractor's lawyers. The objective is to demand a formal withdrawal of the statutory demand before the court filing deadline expires, saving both parties significant litigation costs.

However, directors must be acutely aware that informal settlement negotiations do not pause the statutory limitation periods. If the subcontractor refuses to provide a formal, written withdrawal of the demand, the head contractor must file the application before the 21 days elapse. Failing to file while waiting on a commercial settlement exposes the company to the presumption of insolvency and the associated risks. It is prudent to get legal advice early to manage these parallel negotiation and litigation tracks safely.

Conclusion

When the subcontractor who caused $80,000 in project delays and defects serves a $50,000 statutory demand, the initial reaction is often frustration mixed with alarm. However, as this article demonstrates, a statutory demand is a procedural threat, not a final judgment on the commercial dispute. By understanding the strict 21-day deadline and the serious consequences of the insolvency presumption, head contractors can shift from a reactive stance to a strategic defence. This matters because a winding-up application is rarely a contained, $50,000 problem: it can trigger cross-defaults on your other active projects and place your QBCC licence at risk, turning a single disputed progress claim into an existential threat to the business.

You now know that contractual back-charges and liquidated damages are not just project management tools; they are potent offsetting claims that can be leveraged to defeat an aggressive debt recovery attempt. You also understand the distinction between a genuine dispute over a standard progress claim and the severe difficulty of challenging a demand backed by a BIF Act adjudication certificate. Critically, you know that minor typographical errors will not save you, and that settlement negotiations do not pause the statutory clock.

The next step is decisive action. If you have been served with a statutory demand, do not wait until the deadline is close. Contact a Queensland construction lawyer within the first few days of service—ideally by day five—so there is time to assemble your evidence, attempt a formal withdrawal, and, if necessary, file and serve a set-aside application before the 21-day window expires. In parallel, instruct your commercial team to compile the subcontract, the disputed progress claim, and all evidence of back-charges or delay costs. Every day lost narrows your options; early advice is the difference between a strategic defence and a presumption of insolvency you cannot undo.

FAQs

What is the strict timeframe to set aside a statutory demand in Queensland?

A company has a strict 21-day period from the date of service to apply to the court to set aside a statutory demand under section 459G. This timeframe is absolute and cannot be extended by the courts, meaning both filing the application and serving it on the creditor must occur within this window.

What happens if a head contractor ignores a statutory demand?

Ignoring a statutory demand results in the company being taken to have failed to comply with it under section 459F of the Corporations Act, which in turn enlivens a presumption of insolvency under section 459C. This presumption can enliven serious consequences, including the creditor applying to wind up the company and the directors facing potential exposure for insolvent trading.

How can an offsetting claim defeat a statutory demand?

Under section 459H, an offsetting claim can be used to set aside a statutory demand if the counter-claim reduces the admitted debt below the statutory minimum. Head contractors often use substantiated back-charges for defect rectification or liquidated damages as offsetting claims against a subcontractor's demanded debt.

Can I set aside a demand if there is a typo in the document?

A minor typo rarely justifies setting aside a statutory demand. Under section 459J, a court may only set aside a demand due to a defect if that defect will cause substantial injustice, such as fundamentally confusing the debtor about the amount or nature of the claim.

Is it easy to set aside a statutory demand based on a BIF Act adjudication?

Challenging a statutory demand based on a BIF Act adjudication certificate is notoriously difficult. Because the certificate constitutes a statutory judgment debt, raising a "genuine dispute" about the underlying contract merits usually fails, as courts are unlikely to let respondents re-litigate the adjudicator's decision.

Do settlement negotiations pause the 21-day deadline?

No, settlement negotiations do not pause the strict 21-day deadline to file a set-aside application. If a formal written withdrawal of the demand is not secured, the head contractor must file the application in court before the deadline expires to avoid the presumption of insolvency.

This guide is for informational purposes only and does not constitute legal advice. For advice tailored to your specific circumstances, please contact Merlo Law