Australia Keeps the Suspensory Merger Rule but Softens the Sanction for Not Notifying

Australia keeps its suspensory merger rule but softens the practical consequence of failing to notify, a refinement that meaningfully changes the risk calculus for deal teams working under the country’s new mandatory merger control regime, which took effect on 1 January 2026. Parliament has retained the core prohibition on completing a notifiable acquisition before the Australian Competition and Consumer Commission (ACCC) has cleared or waived it, yet it has adjusted the mechanism by which a non-notified transaction is treated as void. In relevant cases, the ACCC must apply to the Federal Court of Australia for a declaration that a non-notified acquisition is void and taken never to have occurred, shifting the burden and the timing of any unwinding.

This article explains what changed, why it matters, and, critically, how to draft, structure and sequence transactions in response. Deal teams should read the analysis below as forward-looking guidance for deals notified and completed under the new framework.

Executive summary, what changed and why it matters

The reforms establish a mandatory, suspensory merger control regime while calibrating the sanction for non-compliance. Several features dominate the practical landscape. Australia keeps its suspensory merger rule, and rather than treating every non-notified acquisition as automatically void, the ACCC must generally apply to the Federal Court for a declaration of voidness. In addition, the associates and control concepts are intended to capture arrangements that confer control or material influence, so that ordinary commercial arrangements, minority protections, arm’s-length financing and standard governance, are less likely, without more, to bring parties into scope. The timing framework also provides a defined clearance and completion window with the ability to seek an extension in appropriate circumstances.

None of these features dilutes the underlying obligation. A notifiable acquisition still must not complete until the ACCC has approved or waived it, and gun-jumping, completing a notified acquisition without clearance, carries serious enforcement and validity consequences. What is significant is the operational risk profile for borderline cases, and the drafting and sequencing decisions that flow from it.

Quick takeaway for deal teams

• Notifiability first. Run a notifiability assessment early; the suspensory rule still bites.
• Voidness generally requires a court order. For a non-notified acquisition the ACCC must apply to the Federal Court in relevant cases, but other penalties remain.
• Gun-jumping is still fatal. Completing a notified acquisition without clearance exposes parties to voidness and enforcement action.
• Control and material-influence tests matter. Standard minority protections are less likely, without more, to trigger notifiability, but draft carefully.
• Use the extension mechanism. Where completion cannot occur within the applicable window, consider seeking an extension rather than re-notifying.
• Prospective in operation. The regime applies to acquisitions completed on or after commencement.

Background, the mandatory suspensory regime in brief

Australia’s move to a mandatory, suspensory merger control regime, replacing the previous voluntary notification arrangements, was designed to give the regulator advance visibility of transactions that meet notification thresholds and to prevent anti-competitive acquisitions from completing before review. The reforms were enacted through amendments to the Competition and Consumer Act 2010 (Cth) and commenced on 1 January 2026. Under the regime, qualifying acquisitions must be notified to the ACCC and cannot complete until the regulator has granted clearance or a waiver. The regulator’s role, powers and procedural steps are set out in the ACCC’s guidance for mergers and acquisitions.

Australia keeps its suspensory merger rule, and the recent refinements target the operation of the regime, including the mechanism for treating non-notified acquisitions as void and the definitional reach of concepts such as control and association, rather than its foundations. For deal teams, this means the day-to-day workflow of assessing notifiability, engaging the ACCC and sequencing completion should be treated as a core part of transaction planning, while the consequences of getting it wrong are calibrated as described below.

How the suspensory rule operates

A notifiable acquisition that completes without ACCC clearance or waiver is exposed to a severe consequence: it may be treated as void and taken never to have occurred, with all the unwinding, title and financing complications that implies. That approach maximises deterrence but can create acute uncertainty at the margin. Where notifiability is genuinely ambiguous, for example, in structuring around the concepts of control and association or in complex co-investment arrangements, parties need to manage the risk that a completed deal could be treated as invalid. The refinements described below address how, and by whom, that consequence is triggered.

Who must notify? Thresholds and common triggers

Notification is triggered where an acquisition meets the regime’s thresholds and falls within the definition of a notifiable acquisition. The thresholds are set by regulation and turn on transaction and party metrics (including turnover and transaction-value tests), and structural features such as control can bring arrangements into scope even where they are not conventional share or asset purchases. Because thresholds are set and periodically adjusted by the relevant authorities, parties should confirm the current figures against the applicable regulations and current ACCC guidance rather than relying on a fixed number. A recap of the thresholds, notification triggers and regime basics is set out in Mandatory Merger Control Australia (2026), background & thresholds.

Common triggers include acquisitions of shares or assets, incremental acquisitions that cross a threshold, and arrangements that confer control or joint control. Because interests held by connected parties can be relevant to whether control or a material connection exists, structuring decisions, particularly in private equity and co-investment contexts, directly affect whether a transaction is notifiable.

The sanction mechanism, voidness by court declaration

A key feature of the regime is the mechanism by which a non-notified acquisition is treated as void. Rather than relying purely on a self-executing effect, the ACCC may apply to the Federal Court of Australia for a declaration that an acquisition that should have been notified, but was not, is void and taken never to have occurred. This means the practical outcome of invalidity for a non-notified acquisition is achieved through a contested legal process that the regulator must pursue. The mechanism does not create a safe harbour, it shapes who bears the burden, and when.

Where parties have notified and then completed without clearance, gun-jumping, the acquisition is likewise exposed to being treated as void, alongside enforcement exposure. The regime therefore treats seriously both the failure to notify at all and completion of a notified deal without clearance.

Legal mechanics, how the ACCC proceeds

For a non-notified notifiable acquisition, the ACCC’s route to invalidity runs through the Federal Court. The regulator must commence proceedings and obtain a declaration. The court process introduces evidentiary requirements, procedural steps and time. The Federal Court’s role in granting declarations and remedial orders is central to understanding how voidness is achieved in practice.

Practical implications for closing certainty and escrow/conditionality

The practical effect for borderline non-notified transactions is that invalidity is not instantaneous where a court declaration is required. That said, substantial legal risk persists: if the ACCC pursues proceedings, the deal remains exposed to being unwound, and other enforcement tools remain available regardless of the voidness outcome. Deal teams should calibrate escrow sizing and conditionality accordingly, recognising the residual litigation and enforcement risk. Completion mechanics should be structured conservatively, particularly for genuinely ambiguous cases, and parties should retain the ability to respond if the ACCC acts.

What does the ACCC need to do to void a transaction?

For a non-notified acquisition, the ACCC must apply to the Federal Court for a declaration of voidness. The ACCC also retains its broader enforcement toolkit, so the need to obtain a court declaration does not equate to the absence of consequences.

Control, association and minority protections, what dealmakers must know

The concepts of control and association are among the most consequential features of the regime for structuring, because interests of connected persons and arrangements conferring control can bring ordinary commercial arrangements into the notification net. The regime is intended to capture arrangements that confer control or material influence, so that standard, arm’s-length commercial terms are less likely, without more, to create the connection that triggers notifiability. This is particularly significant for private equity sponsors, co-investors and lenders, whose customary rights and financing terms could otherwise be characterised as indicia of control.

The practical upshot is that deal teams can adopt market-standard protective terms with greater confidence, provided the drafting stays within ordinary commercial bounds and does not stray into conferring control, joint control or a coordinated decision-making function. Because characterisation is fact-sensitive, parties should test their structures against the statutory definitions and current ACCC guidance.

Examples of minority protection terms likely to be lower-risk

• Reserved matters limited to investor protection. Consent rights over fundamental changes, amendments to constitutional documents, issuing new equity that dilutes the investor, incurring debt above agreed thresholds, or changing the nature of the business.
• Standard information rights. Rights to receive management accounts, budgets and audited financials for monitoring purposes.
• Arm’s-length financing terms. Ordinary lending covenants, security and event-of-default provisions on market terms.
• Pre-emption and anti-dilution rights. Rights designed to preserve, not enlarge, the investor’s economic position.
• A single board observer or minority director seat without veto power over ordinary operational decisions.

Red flags that may create control or joint control

• Veto rights over ordinary-course commercial decisions such as pricing, supply, key customers or day-to-day operations.
• Rights to appoint or remove management or to direct the strategic conduct of the business.
• Coordinated voting or shareholder-arrangement obligations that align the investor’s votes with another party’s.
• Financing terms that function as control, for example, step-in rights that go beyond enforcement of security and allow direction of the business.
• Co-investment arrangements with pooled decision-making that effectively create joint control among co-investors.

Drafting checklist and model drafting language

When documenting minority protections intended to avoid control or association characterisation, deal teams should adopt a disciplined approach:

• Confine reserved matters to genuine protective rights and avoid ordinary-course vetoes.
• Draft financing terms on demonstrably arm’s-length market terms and document the commercial rationale.
• Avoid voting-coordination language among co-investors; keep decision-making independent.
• Limit board representation and expressly exclude control over operational and strategic direction.
• Maintain a contemporaneous record of the commercial purpose of protective terms to support any later characterisation analysis.

Illustrative only: “The Investor’s consent rights under clause [X] are reserved solely to protect the Investor’s economic interest as a minority holder and shall not extend to the ordinary-course operational or commercial decisions of the Company.” Sample wording of this kind should always be tailored and reviewed against the statutory text and current ACCC guidance.

Timing & the extension mechanism, practical use and triggers

The regime provides defined timeframes for the ACCC’s review and for completion following clearance, together with mechanisms to extend timeframes in appropriate circumstances rather than starting the process again. Because the specific periods and any extension rights are set by the legislation and regulations and may be adjusted, parties should confirm the applicable completion window and extension conditions against the current statutory text and ACCC guidance for their transaction. Where relying on an extension is preferable to re-notification, it can be a materially more efficient route than restarting the review and incurring its associated cost, delay and uncertainty.

When to seek an extension vs. re-notify

An extension, where available, is generally appropriate where the transaction is materially unchanged but completion has been delayed by factors outside the parties’ control, for example, a foreign regulator’s timetable, outstanding conditions precedent, or third-party consents that are taking longer than anticipated. Re-notification becomes necessary where the transaction itself has changed in a way that affects the competitive assessment. The practical discipline is to identify slippage early, document the reason for delay, and take the appropriate step with sufficient lead time before the applicable window closes.

Example timeline for cross-border deals

Consider a cross-border acquisition cleared by the ACCC but awaiting approval from an overseas competition authority. If the foreign process is expected to run beyond the applicable completion window, the parties should prepare their extension request (where the mechanism is available) supported by evidence of the foreign timetable and the status of conditions precedent, so as to preserve the existing clearance and avoid the cost and delay of re-notifying, provided the deal remains substantively the same.

What deal teams should do differently, step-by-step playbook

The regime rewards disciplined process. The sanction mechanism and the control and association tests shape how deal teams should sequence and document a transaction across its lifecycle.

• Pre-signing. Run the notifiability checklist against current thresholds; assess control and association exposure across the sponsor, co-investors and lenders; and structure protective rights to stay within ordinary commercial bounds where the intention is to avoid triggering notifiability.
• Signing. Draft conditionality tied to ACCC clearance or waiver; include antitrust covenants and anti-gun-jumping controls; establish information-flow protocols so competitively sensitive information is not exchanged prematurely; and size escrow to residual enforcement and litigation risk.
• Pre-closing / clearance period. Monitor the applicable completion window; identify slippage early and prepare an extension request where completion cannot occur in time and the mechanism is available; negotiate a realistic completion timetable; and manage third-party consents on a critical-path basis.
• Post-closing. Retain records evidencing notifiability analysis, control and association assessment and clearance; and maintain readiness to respond to any ACCC enquiry.

Contract clauses to include

• Completion mechanics. Completion conditional on ACCC clearance or waiver, with clear long-stop dates aligned to the applicable clearance and completion windows.
• Anti-gun-jumping warranties and covenants. Undertakings not to complete or integrate until clearance, and to maintain arm’s-length conduct during the review period.
• Notification covenants. Obligations to notify, to cooperate with the ACCC, and to provide information and assistance.
• Unwinding provisions. Mechanics addressing what happens if the ACCC seeks and obtains a court declaration, including undertakings to unwind if required.
• Information controls. Clean-team protocols governing the exchange of competitively sensitive information pre-completion.

How the sanction mechanism affects indemnities and escrow sizing

Because voidness for non-notification generally requires a Federal Court declaration, the immediate title and price risk can, for borderline cases, be assessed against the probability and timing of ACCC action. However, the ACCC retains enforcement remedies and the ability to seek a court declaration, so indemnities and escrow should be calibrated to that residual exposure rather than eliminated. The nuanced sanction mechanism allows risk allocation to be tailored to the actual probability and cost of ACCC action, while remaining conservative for genuinely uncertain cases.

Enforcement, penalties and reputational risk, residual exposure

The requirement for a court declaration to void a non-notified acquisition does not remove exposure. The ACCC retains a substantial enforcement toolkit, including the ability to seek pecuniary penalties, remedial orders and enforceable undertakings, alongside court declarations. A public ACCC investigation carries reputational cost and can affect a party’s certainty in future transactions. In short, the sanction mechanism shapes how invalidity is triggered, but the enforcement risk, financial and reputational, persists.

Enforcement context

The regulator’s enforcement priorities and remedies are set out in the ACCC’s published materials, and the Federal Court is the forum through which the ACCC pursues declarations and orders. Deal teams should treat the ACCC’s willingness to litigate as a live consideration when weighing the decision not to notify a borderline transaction: the requirement for a court declaration does not mean the regulator will decline to act.

Conclusion, practical checklist and next steps for counsel

Australia keeps its suspensory merger rule, and the practical message for counsel is one of disciplined, forward-looking process rather than complacency. The top actions are: assess notifiability early against current thresholds; structure minority protections and financing within ordinary commercial bounds to manage control and association exposure; draft robust anti-gun-jumping and completion mechanics; use the extension mechanism (where available) rather than re-notifying where completion slips; and calibrate escrow and indemnities to residual enforcement risk. Because precise statutory citations, thresholds and timeframes should be confirmed against the enacted legislation and current ACCC guidance, deal teams should seek tailored legal advice before relying on any structuring decision.

Sources

1. Australian Competition and Consumer Commission (ACCC), Mergers & acquisitions
2. Federal Court of Australia
3. Federal Register of Legislation
4. Parliament of Australia, Bills & Legislation
5. Australian Government, Treasury
6. Law Council of Australia
7. Australian Competition Tribunal