When Silence Is Not Golden: The Duty to Disclose in Modern Practice

The duty to disclose sits at the heart of fiduciary relationships, contractual negotiations, and statutory regimes across the common law world. In Australia, where courts in Sydney and Melbourne have shaped commercial practice for over a century, the principle that silence can carry legal consequences has expanded well beyond the old caveat emptor philosophy. Businesses operating in Brisbane, Perth, or Adelaide now navigate overlapping disclosure duties imposed by statute, equity, and contract, with regulators such as ASIC watching closely.

The consequences of getting it wrong range from reputational damage and regulatory penalties to full-scale class actions, as seen in the wake of the Royal Commission into Misconduct in the Banking, Superannuation and Financial Services Industry. For practitioners advising corporate clients, the question is no longer whether a duty to speak exists, but when it arises, how far it extends, and what remedies follow when it is breached. The following sections explore those questions through Australian law, recent case law, and the practical reality of disclosure in litigation.

The common law foundation of disclosure duties

Long before statutes codified disclosure obligations, Australian courts built a body of equity around the idea that certain relationships demand candour. The High Court's decision in Hospital Products Ltd v United States Surgical Corporation remains a touchstone, holding that a party in a position of influence must not exploit that position through silence or half-truths. The principle operates alongside the equitable duty of confidence and the fiduciary obligations recognised in cases involving trustees, agents, and corporate directors.

Where one party possesses material information that the other cannot reasonably access, equity may impose a duty to volunteer it. This is particularly true in transactions involving insurance, where the rule in Carter v Boehm established centuries ago that an assured must disclose every material circumstance known to the assured. In modern Australian practice, the Insurance Contracts Act 1984 moderates that rule, but the underlying principle endures. Brokers, financial planners, and corporate advisers operating in Melbourne's Collins Street or Sydney's Macquarie Street all recognise that selective silence can void a contract, trigger damages, or ground a regulatory referral.

Continuous disclosure and the Corporations Act

Australian securities law imposes one of the most rigorous disclosure regimes in the world through Part 6CA of the Corporations Act 2001 and the ASX Listing Rules. A listed entity must immediately tell the market about any information that a reasonable person would expect to have a material effect on the price or value of its securities. Failure to do so can attract civil penalty orders, compensation claims from shareholders, and criminal liability for reckless or dishonest conduct.

The case of Centro Properties Group illustrated how quickly the costs of non-disclosure can compound. When Centro's 2007-08 accounts failed to disclose billions in short-term debt obligations, shareholders launched successful class actions that ran for years. More recently, ASIC has pursued civil penalty proceedings against various directors, including cases involving Fortescue Metals and the James Hardie building products litigation. The lesson for corporate officers in Sydney boardrooms is clear: silence, even if motivated by optimism or a desire to avoid market overreaction, is rarely defensible once materiality is established.

When silence crosses into civil fraud

Disclosure duties also arise outside securities regulation, particularly in contractual dealings where one party relies on the other for accurate information. The tort of negligent misstatement, recognised by the High Court in Esso Petroleum Co Ltd v Mardon, requires that information provided be accurate and that reasonable care be taken. When information is actively concealed, or when half-truths are deployed to mislead, the conduct may escalate into civil fraud, carrying punitive damages and unenforceability of the contract itself.

Australian courts have repeatedly emphasised that there is no positive duty to volunteer information in arm's length commercial dealings. Yet the boundary between permissible reticence and actionable fraud is narrower than many business people assume. A vendor who knows of a structural defect in a property sold in inner Brisbane cannot respond to direct questions with vague assurances. Likewise, a franchisor in Adelaide who withholds information about declining system-wide sales from a prospective franchisee risks rescission of the agreement and a damages claim.

The doctrinal framework developed in cases like Gould v Vaggelas and Demagogue Pty Ltd v Ramensky confirms that silence combined with active steps to conceal, or with misleading partial disclosures, will be treated as fraudulent misrepresentation. For trial lawyers, the practical challenge lies in proving the defendant's knowledge and the materiality of the undisclosed information. Those considering how legal exposure translates into operational vulnerability should reflect on perspectives shared in When Legal Risk Becomes Business Risk: A Litigator's Perspective.

Banking and financial services: a sector under scrutiny

Few industries in Australia have felt the weight of disclosure duties more heavily than banking. The Royal Commission documented case after case where financial institutions failed to disclose fees, conflicts, or product risks to retail customers. Westpac, the Commonwealth Bank, ANZ, and NAB all faced enforcement action, civil penalty proceedings, or enforceable undertakings arising from disclosure failures. The reforms that followed, including the Financial Accountability Regime and expanded obligations under the Banking Code of Practice, have raised the bar significantly.

For in-house counsel and compliance teams, the new environment requires proactive monitoring rather than reactive disclosure. Product disclosure statements, target market determinations, and ongoing reporting obligations under ASIC Regulatory Guide 271 all assume that information flows from the institution to the customer in a timely and complete manner. When that flow breaks down, whether through system error, deliberate concealment, or institutional blindness, the consequences can include class actions, regulator-imposed penalties, and the kind of brand damage that takes a decade to repair. Practising litigators observing this space often see parallels to other high-stakes advisory work, and those interested in the discipline of recovery and resilience might find useful parallels in thoughtful guides such as compression gear for recovery, where careful selection and proper fit make the difference between harm and benefit.

Disclosure in government litigation

Litigating against government entities in Australia introduces its own set of disclosure challenges. Under the various Supreme Court rules and the Federal Court Rules 2011, parties are required to give discovery of documents within their possession, custody, or power. Government agencies sometimes argue that documents are protected by public interest immunity, legal professional privilege, or statutory secrecy provisions. The tension between open justice and confidentiality becomes acute when government defendants are involved.

Cases such as Esanda Finance Corporation v Peat Marwick Hungerfords and the more recent decision in Hanson Construction Materials Pty Ltd v Davey illustrate how courts balance competing interests. Government litigants do not enjoy blanket immunity from disclosure, and the courts have been willing to inspect documents in chambers to determine whether claims of privilege or confidentiality are properly made. Practitioners advising clients in disputes with state or federal agencies should anticipate that disclosure will be a battleground, not a formality. Strategic considerations around early discovery requests, third-party subpoenas, and the use of the Freedom of Information regime as a litigation tool are all part of the modern practice. Detailed discussion of these strategic pitfalls appears in resources covering government litigation strategies.

Practical steps for practitioners and businesses

Navigating the duty to disclose requires a combination of legal knowledge, document discipline, and cultural commitment. Lawyers advising corporate clients in any Australian capital should begin with a clear understanding of which statutory regimes apply. A financial services business faces continuous disclosure under the Corporations Act; a property developer faces consumer protection rules under the Australian Consumer Law; a professional adviser faces fiduciary duties at general law. Mapping these overlapping obligations is the first step toward compliance.

Documentation matters as much as substantive disclosure. When information is exchanged in negotiations, contemporaneous file notes can demonstrate that full disclosure was made, or, conversely, can reveal patterns of selective omission. Many of the post-Royal Commission settlements included findings that internal emails contradicted the public representations made by the institutions. Training staff to recognise when a question demands a complete answer, rather than a tactical response, is one of the simplest and most effective controls a firm or company can implement.

The following table contrasts the principal disclosure regimes a mid-sized Australian business is most likely to encounter:

Regime	Source	Trigger	Key remedy
Continuous disclosure	Corporations Act 2001, ASX Listing Rules	Information materially affecting share price	Civil penalty, compensation, criminal prosecution
Consumer protection	Australian Consumer Law, ACL s.18	Misleading or deceptive conduct in trade or commerce	Damages, injunctions, ACCC enforcement
Insurance	Insurance Contracts Act 1984	Material circumstances known to insured	Avoidance of contract, damages
Banking	Banking Code of Practice, Financial Accountability Regime	Failure to disclose fees, conflicts, or risks	Enforceable undertaking, class action, ASIC penalty
Real property	Conveyancing Act 1919 (NSW) and equivalents	Latent defects and encumbrances	Rescission, damages, vendor liability
Government litigation	Federal Court Rules 2011, state Supreme Court rules	Discovery obligations in pending proceedings	Adverse inference, costs, contempt findings

When disclosure obligations are uncertain, early advice from a litigation specialist can prevent a manageable problem from becoming a crisis. Edward F. Mannino brings decades of courtroom experience to clients facing the kind of high-stakes disputes where silence is no longer an option. If your business is confronting a disclosure question, or if you are weighing whether a regulatory or contractual matter requires voluntary action, reach out to schedule a consultation and begin the conversation before a deadline forces your hand.