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In the decision of Petersen1 in June this year, the Federal Court of Australia confirmed that an appropriately worded “adverse costs” or “after the event” (ATE) insurance policy could constitute sufficient security for a defendant’s costs, but ruled that the policy in question was insufficient.
The Court left open the possibility that an ATE insurance policy could be adequate security if a plaintiff can establish that the likely coverage response and enforceability is sufficiently certain for defendants.
In the circumstances, both plaintiffs and defendants should take care when negotiating security. In particular, defendants should be prepared to challenge the offer of such security if it provides insufficient certainty of recovery.
Security for costs is often sought in class actions – it is an important tool for defendants to ensure recovery of legal costs (which can be significant) from plaintiffs in the event the claims are unsuccessful. Typically, security is provided in the form of payment into Court or an unconditional bank guarantee. Plaintiffs are increasingly offering security by way of ATE insurance (which commonly covers their exposure to adverse costs orders, among other things).
In Petersen, the Federal Court held that the ATE insurance policy, which indemnified the applicant for defence costs, did not satisfy the threshold for security due to the potential obstacles the respondents might face in recovering their costs under the policy. Importantly:
Accordingly, the Court ordered security to be provided in the traditional form (payment to the Court or bank guarantee).
The contents of this publication are for reference purposes only and may not be current as at the date of accessing this publication. They do not constitute legal advice and should not be relied upon as such. Specific legal advice about your specific circumstances should always be sought separately before taking any action based on this publication.
© Herbert Smith Freehills 2025
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