Credit Suisse AG v Gu (No 3) [2026] FCA 439

This proceeding started after the sale of a Mosman residential property known as 10 Superba Parade. Credit Suisse AG had been the registered mortgagee, and receivers appointed by Credit Suisse sold the property on or about 18 January 2021. Once the registered mortgage debt and the receivers' costs were paid, more than $5.5 million remained in a controlled monies account.

That surplus became the centre of the dispute. The Court was not deciding a simple borrower-versus-bank claim. Instead, it had to sort out competing claims by Great Lands Investment Pty Ltd, the Hu Parties, and i-Prosperity Pty Ltd (in liquidation), or IPPL. Each said it had an interest that had affected the property and should now attach to the surplus sale proceeds.

The case is commercially important because it combines several problems that often appear together in distressed private transactions: related-party lending, unregistered or disputed security, company money being used in personal dealings, bankruptcy avoidance, and arguments about who has the better equity once the asset has already been sold.

The active parties identified by the Court were Great Lands, the Hu Parties, and IPPL. Credit Suisse no longer claimed any interest in the property or the surplus funds. Mr Gu, the former owner of the property, did not actively participate in the proceeding and had left Australia for New Zealand in July 2020.

Great Lands relied on a mortgage granted by Mr Gu dated 28 June 2019. Its position was therefore based on a conventional security document, but one that later faced a bankruptcy avoidance challenge.

The Hu Parties relied on clause 7.2 of a deed of guarantee and indemnity dated 2 June 2020. Their argument raised a common commercial issue: whether wording in a guarantee or related deed actually creates a proprietary interest, or merely gives contractual rights that do not amount to security over land or sale proceeds.

IPPL's claim was different in nature. It said its funds had been applied towards the acquisition of the property in 2017. The Court recorded that Mr Gu was a director of IPPL at the time and owed fiduciary duties to the company, as well as duties under the Corporations Act. That opened the door to equitable remedies such as tracing, proprietary claims, and subrogation.

So the Court had before it three very different pathways to recovery: a mortgage claim, a deed-based security argument, and a company-funds tracing case. That is one reason the judgment is useful for business readers. It shows that not all claims to property proceeds are created equal, even where each claimant can point to a document or a payment.

The Court had to determine whether each claimant had a valid proprietary interest affecting the property or the surplus sale proceeds, and then resolve priority between those interests. The catchwords and orders show that this involved several distinct legal questions.

For Great Lands, one major issue was whether the mortgage dated 28 June 2019 was void against the trustee in bankruptcy under section 121(1) of the Bankruptcy Act 1966 (Cth). The catchwords show that the Court dealt with avoidance of transfer, purpose to defeat creditors, the transferee's good faith defence, and restitution under section 121(5).

For the Hu Parties, the key issue was construction of clause 7.2 of the deed of guarantee and indemnity. The Court had to decide whether that clause created an equitable charge or other equitable proprietary interest. The catchwords specifically highlight the question whether a contractual provision conferring a "caveatable interest" creates proprietary security, and the distinction between a caveat and a security interest.

For IPPL, the issues were broader and more equitable in character. The catchwords refer to purchase money resulting trust, constructive trust, misappropriation of company funds, tracing into proceeds of sale, fiduciary duties, and subrogation to a discharged registered mortgage. The Court also had to consider priorities, timing of equitable interests, alleged representation by silence, failure to caveat, and postponement.

In practical terms, the Court was asking four questions that matter to many businesses: did the claimant really have security, did insolvency law undo it, could company money be traced into the asset, and if more than one equitable claimant existed, whose claim came first?

The Court resolved the dispute by a series of declarations.

First, it declared that clause 7.2 of the deed of guarantee and indemnity dated 2 June 2020 did not create an equitable charge or other equitable proprietary interest in favour of the Hu Parties over the Superba property or its sale proceeds. That is a direct and important finding on security drafting.

Second, it declared that the Great Lands mortgage dated 28 June 2019 was void against the trustee in bankruptcy under section 121(1) of the Bankruptcy Act. But the Court did not stop there. It also declared that Great Lands was entitled, under section 121(5) of the Bankruptcy Act and section 100-5 of the Insolvency Practice Schedule (Bankruptcy), to $2,193,209.62 from the surplus funds. The amount was stated to be the value of the consideration of $3,000,000 given by Great Lands for the avoided transfer, less $806,791 repaid.

Third, the Court accepted important parts of IPPL's case. It declared that IPPL was subrogated to the rights formerly held by Credit Suisse as registered mortgagee to the extent of $280,000. It also declared that IPPL held an equitable proprietary interest in the surplus funds to the extent of $1,045,246.14 and any traceable accretions to that amount, with that interest arising on settlement of the purchase of the property shortly before 3 May 2017.

Fourth, the Court declared that IPPL had not established any presently enforceable right of subrogation to rights formerly held by Great Lands under the Great Lands mortgage. So IPPL succeeded in part, but not on every route it advanced.

Fifth, the Court declared that IPPL's interests identified in the subrogation and proprietary interest declarations were not postponed to any interest claimed by the Hu Parties.

Finally, the Court declared that the imposition of the Higher Interest Rate in clauses 5.4, 5.5 and 5.7(a)(ii) of the Great Lands loan agreement was void and unenforceable as a penalty.

The Court then directed the parties to confer and propose short minutes dealing with release of the surplus funds, costs, and any other matter needed to finalise the proceeding. If they could not agree, the dispute about final orders was to be determined on the papers.

One of the most useful parts of the judgment for business readers is the Court's treatment of the Hu Parties' deed clause. The catchwords expressly identify the issue as whether a contractual provision conferring a "caveatable interest" creates proprietary security, and they emphasise the distinction between a caveat and a security interest.

That distinction matters. A caveat is a notice mechanism. It can be used to protect an asserted interest, but it does not itself create the underlying proprietary right. A security interest, by contrast, depends on the legal effect of the document and surrounding rights. If the document does not actually create an equitable charge or other proprietary interest, the fact that a party describes its position as caveatable will not turn it into real security.

The Court's declaration was clear: clause 7.2 did not create an equitable charge or other equitable proprietary interest over the property or its sale proceeds. For businesses, that means you should be very cautious about relying on broad, improvised or label-heavy drafting. Calling something a security right, or saying a party has a caveatable interest, is not enough if the operative language does not legally create the proprietary interest you need.

This is especially important in founder-led businesses and private lending arrangements, where parties often use short deeds, side letters or guarantee clauses to save time. If the commercial intention is to obtain security over land or sale proceeds, the drafting must do that clearly and effectively. Otherwise, in an insolvency or priority dispute, you may be left with only personal contractual rights against a debtor who cannot pay.

The judgment records that Mr Gu was a director of IPPL at the time of the 2017 transactions by which IPPL said its funds were applied towards the acquisition of the property. In that capacity, he owed fiduciary duties to IPPL and duties under sections 180, 181 and 182 of the Corporations Act.

The catchwords show that the Court dealt with purchase money resulting trust, constructive trust, misappropriation of company funds, Black v S Freedman trust, tracing into proceeds of sale, and proprietary consequences of misuse of company property. Even without restating every step of the reasoning, the declarations make the practical point clear: misuse of company funds can support proprietary remedies, not just a debt claim or a claim for compensation.

That is highly relevant for startups and SMEs. In closely held businesses, directors and founders sometimes move money between company accounts, personal projects and related entities with poor documentation. This case shows the risk of doing that. If company money is used to acquire or support acquisition of property, the company or its liquidator may later assert an equitable proprietary interest in the asset or in the sale proceeds. That can materially change the priority outcome against other claimants.

IPPL succeeded in establishing an equitable proprietary interest in the surplus funds to the extent of $1,045,246.14 and traceable accretions, and it also obtained subrogation to former Credit Suisse mortgage rights to the extent of $280,000. Those declarations show how powerful equitable remedies can be when company funds have been applied to secured debt or acquisition costs.

The Great Lands part of the case is a useful reminder that insolvency law can reshape a lender's position in more than one direction at once. The Court declared the Great Lands mortgage void against the trustee in bankruptcy under section 121(1) of the Bankruptcy Act. That means the mortgage could not stand against the trustee in bankruptcy.

But Great Lands was not left with nothing. The Court also declared that Great Lands was entitled to $2,193,209.62 from the surplus funds under the restitution mechanism in section 121(5) of the Bankruptcy Act and section 100-5 of the Insolvency Practice Schedule (Bankruptcy). The amount was calculated as the value of the consideration of $3,000,000 given by Great Lands for the avoided transfer, less $806,791 repaid.

For business readers, the lesson is that an avoided security interest does not necessarily mean total loss, but it does mean the recovery path may be very different from ordinary secured enforcement. A lender may move from claiming as mortgagee to claiming restitution for value given. That can affect timing, priority arguments and the amount ultimately recovered.

The Court also declared that the Higher Interest Rate in the Great Lands loan agreement was void and unenforceable as a penalty. The orders do not set out the full wording of the clause, so this page does not overstate the reasoning. Still, the practical message is clear enough. If a loan agreement imposes a higher rate on default or on the occurrence of specified events, that clause must be drafted and structured carefully. If it operates as a penalty rather than a legally enforceable protection of legitimate interests, it may fail.

Private lenders, founder-investors and businesses using bespoke loan documents should take that seriously. A tough-looking default interest clause may not improve recovery if it cannot survive challenge.

This case is best read as a transaction design warning. It shows what can happen when several weaknesses exist at once: company money is used in a personal acquisition, security wording is unclear, insolvency intervenes, and parties assume that practical control or informal understandings will protect them.

For lenders and investors, the first lesson is to separate contractual comfort from proprietary security. If you want a charge, mortgage or other proprietary right, the document must create it clearly. If you are relying on a guarantee deed, ask whether it truly grants security or merely supports a personal claim.

For directors and founders, the second lesson is governance. Company funds should not be treated as available for personal property transactions without proper authority and documentation. If they are used, the company or a later liquidator may assert tracing and proprietary claims that disrupt everyone else's assumptions.

For businesses facing insolvency risk, the third lesson is that priority outcomes are highly sensitive to timing, legal character and formal validity. A mortgage may be avoided. A restitution claim may survive. A proprietary claim based on traced company funds may outrank another claimant. A failure to create real security may leave a party exposed.

The practical approach is straightforward.

The judgment was delivered by Cheeseman J on 17 April 2026 in the Federal Court of Australia. The hearing dates recorded in the judgment were 4 to 15 March 2024, 29 July 2024 and 5 December 2024. The Court directed the parties to confer and provide proposed short minutes of order by 15 May 2026 dealing with release of the surplus funds, costs and any other matter necessary to finalise the proceeding.

The declarations set out the Court's substantive conclusions on the competing claims. The final mechanics of payment and costs were to be addressed after the reasons were delivered.