This article was co-authored by Nancy Wang Pricipal Solicitor and Jialin Liu Solicitor at W & G Lawyers.
Consider a situation we now see in our office with some regularity. A professional woman in her forties sells an apartment she bought years before she met her partner, adds her savings, and pays the entire price of a new family home. The title — for reasons that seemed sensible at the time, or for no articulated reason at all — goes into joint names, or into her partner’s name alone. The relationship later ends, and she asks the question every family lawyer dreads answering in a single sentence: whose house is it?
The honest answer is that it depends on which body of law is asked, and how long the relationship lasted. The equitable doctrines — resulting trusts, constructive trusts and the presumption of advancement — give one answer. The Family Law Act 1975 (Cth), substantially rewritten with effect from 10 June 2025, gives another. This article works through both, and explains why the passage of time quietly transfers power from the first to the second.
A doctrine built for a world that no longer exists
The equitable presumptions governing property between spouses were forged in the nineteenth century, when the paradigm was a husband with income and capital and a wife with neither. Equity therefore assumed that a husband who put property in his wife’s name intended a gift — an “advancement” — because he was under a moral (and once legal) obligation to provide for her. The reverse transaction attracted no such assumption. A wife who paid for property placed in her husband’s name was presumed to keep the beneficial interest under a resulting trust, because the law could see no reason why she would give her property away.
Fast-forward to contemporary Australia. Women routinely enter marriages and de facto relationships with substantial accumulated wealth: professional incomes, investment portfolios, real property, superannuation, business interests. It is now entirely common for a home, an investment property or a vehicle to be bought in joint names — or solely in the male partner’s name — while the whole purchase price is traceable to the female partner’s pre-relationship savings or earnings. The doctrinal machinery, however, still runs on its Victorian gearing.
Equity’s default answer: the resulting trust
Outside family law proceedings, the presumed resulting trust remains the starting point. Where a person pays the purchase price of property conveyed into the name of another (or into joint names in shares that do not reflect the contributions), equity presumes that the legal owner holds the property — or the disproportionate share of it — on trust for the person who provided the money. The leading Australian authority remains Calverley v Green (1984) 155 CLR 242, a de facto case in which the High Court applied the presumption to a home held in joint names but funded unequally.
Applied to our scenario, the doctrine is straightforwardly protective of the woman who paid. If she funded the entire price of a house registered in her partner’s sole name, the presumption is that he holds it on resulting trust for her absolutely. If it is registered in joint names, the presumption is that he holds his legal half-share on trust for her. The same logic applies in principle to cars and other substantial chattels, though vehicles depreciate quickly and disputes over them rarely justify the litigation.
Two qualifications matter. First, the presumption reflects intention at the date of purchase and is rebutted by evidence of what the payer actually intended — statements at the time, the purpose of the acquisition, the mortgage arrangements, what the parties told the bank and the conveyancer. Second, in Trustees of the Property of Cummins v Cummins (2006) 227 CLR 278 the High Court signalled that where a married couple acquires a matrimonial home in joint names, the natural inference is that they intended equal beneficial ownership regardless of unequal purchase contributions. The matrimonial home is treated as the physical embodiment of the marriage itself, and the accountant’s tracing exercise gives way to that inference. A woman who funds the jointly held family home entirely from her own money should not assume equity will hand it all back to her; a jointly held investment property funded by her alone stands on rather different ground.
The presumption that only runs one way
The presumption of advancement displaces the resulting trust in defined relationships: husband to wife, fiancé to fiancée (Wirth v Wirth (1956) 98 CLR 228), and parent to child — extended beyond fathers to mothers in Nelson v Nelson (1995) 184 CLR 538. It has never been extended to transfers from wife to husband, nor between de facto partners in either direction (Calverley v Green again).
The result is a striking asymmetry that now operates, ironically, in favour of women. A husband who puts property he paid for into his wife’s name is presumed to have given it to her; a wife who does the same for her husband is presumed not to have given it to him, and equity presumes a trust back in her favour. The doctrine’s Victorian sexism has inverted its practical effect.
The High Court has repeatedly described the presumptions as out of step with modern life — as early as Martin v Martin (1959) 110 CLR 297, and again in Nelson. Its most recent word is Bosanac v Commissioner of Taxation (2022) 275 CLR 293, where the ATO argued that a husband whose borrowings had helped fund a Perth home registered solely in his wife’s name retained a half interest under a resulting trust. The Court unanimously held the wife was sole beneficial owner — and, notably, declined to abolish either presumption while stressing how little work they now do. The presumptions are default settings of low evidentiary weight, decisive only where the objective facts about intention are truly neutral, which is rare. Courts today decide these cases on contemporaneous conduct — how the couple structured their other assets, who signed the loan, what was said at the time — rather than on presumptions.
When her money paid the renovations, not the deposit: constructive trusts
The resulting trust looks only at money contributed to the purchase price at the moment of acquisition. The constructive trust is broader, and in disputes falling outside the Family Law Act — today, chiefly contests with deceased estates, trustees in bankruptcy and other third parties — it is often the more important doctrine.
Two strands matter. The first is the common intention constructive trust: where the parties actually agreed or understood that ownership would be shared in a particular way, and one party acted to their detriment in reliance on that understanding, equity enforces the understanding. The second is the line of Muschinski v Dodds (1985) 160 CLR 583 and Baumgartner v Baumgartner (1987) 164 CLR 137: where parties pool resources for a joint relationship endeavour that fails without attributable blame, it is unconscionable for the legal owner to keep the benefit of the other’s contributions, and equity imposes a trust to restore or apportion them. In Baumgartner itself, pooled earnings applied to a home in the man’s sole name yielded the woman a beneficial share proportionate to her contributions.
For the wealthier partner, the constructive trust cuts both ways. It can protect her where the resulting trust cannot — where her money went not into the purchase price but into renovations, mortgage repayments, or pooled living expenses that freed her partner’s income to service the loan. But it equally gives her partner an avenue: a man who contributed labour, renovations or pooled income to a property she owns may establish a beneficial interest against her. The doctrine is about unconscionability, not gender.
Inside a marriage, the Family Law Act changes the game entirely
Everything above matters chiefly where the dispute is with a trustee in bankruptcy, a creditor, an estate or another third party. Between married couples — and, since 2009, de facto couples meeting the statutory thresholds — property adjustment on breakdown is governed by ss 79 and 90SM of the Family Law Act, and the equitable analysis fades into the background.
Those provisions were substantially restructured by the Family Law Amendment Act 2024 (Cth), which commenced on 10 June 2025 and applies to most matters not yet finally heard. The court’s approach is now codified: it identifies the parties’ existing legal and equitable rights and liabilities (the exercise the High Court described in Stanford v Stanford (2012) 247 CLR 108), assesses contributions under s 79(4), weighs the parties’ current and future circumstances under s 79(5), and makes orders only if it is just and equitable to do so. The amendments also made the economic effect of family violence an express consideration at both stages (ss 79(4)(ca) and 79(5)(a)), added material wastage of property as a current-circumstances factor (s 79(5)(d)), wrote the duty of full and frank financial disclosure into the Act itself (ss 71B and 90RI), and even gave companion animals their own regime (ss 79(6)–(7)). The de facto provisions in s 90SM mirror all of this.
Under this regime, whose name is on the title is close to irrelevant, and a resulting trust in the wife’s favour confers no immunity. Her sole funding of the assets is instead recognised as her contribution — and how much that contribution is worth depends overwhelmingly on the length of the relationship.
Two years is not twenty: why length changes everything
The short relationship. In a marriage or de facto relationship of one or two years, particularly without children, initial capital contributions dominate. The authorities consistently give decisive weight to what each party brought in, and the just and equitable outcome frequently approximates returning the parties to their starting positions, adjusted for anything jointly built in the interim. A woman who entered a two-year childless marriage with the entire asset base, and whose partner contributed modestly, can realistically expect to retain the overwhelming bulk of it. Indeed, following Stanford, in a genuinely short relationship where the parties kept their finances separate, a court may conclude it is not just and equitable to make any adjustment at all.
The long relationship. Over fifteen, twenty or thirty years, the significance of who paid the original purchase price erodes. Initial contributions are not frozen in time; they diminish as the myriad contributions of both parties accumulate. Decades of homemaking, parenting, income, mortgage payments, renovations and mutual support are weighed against the historical fact that the deposit came from her savings in 2004. In a long marriage with children, an origin-of-funds argument may still earn some recognition, but it will not quarantine the asset. By this point the presumption of advancement and the resulting trust are museum pieces: s 79 simply overrides them as between the spouses.
The myth of “excluding” assets
Parties frequently believe pre-relationship assets, gifts or inheritances can be “excluded” from the pool. The Full Court in Holland & Holland [2017] FamCAFC 166 held squarely that this language is wrong in principle: all property of both parties is amenable to adjustment. What the court can do is treat an asset as the sole contribution of one party — sometimes assessing it in a separate pool, as in Bonnici & Bonnici (1998) FLC 92-823 — with the practical effect that the other party receives little or none of its value, especially where the asset arrived late or the other party contributed nothing to it. Kessey v Kessey (1994) FLC 92-495 similarly treats a gift from a parent as a contribution by the recipient spouse alone unless the donor intended to benefit both. Protection comes through the contribution analysis, not through exclusion as of right.
The 2025 amendments have already reshaped this area in another respect: in Shinohara & Shinohara [2025] FedCFamC1A 126 the Full Court held that money a party has dissipated can no longer be “added back” to the pool as notional property; wastage is instead weighed as a factor under s 79(5)(d). Arguments once run through creative accounting must now be run through the statutory considerations.
The only real shield: a binding financial agreement
The one instrument that genuinely removes property from the court’s adjustment power is a binding financial agreement under Part VIIIA (ss 90B–90D) or, for de facto couples, Part VIIIAB. A properly executed BFA — with the mandatory independent legal advice on each side — can provide that identified assets remain the sole property of one partner whatever happens. For a woman entering a relationship with significant wealth, it is the single most effective legal protection available.
But Thorne v Kennedy (2017) 259 CLR 443 stands as the great cautionary tale: agreements presented under pressure, on take-it-or-leave-it terms, shortly before a wedding, were set aside for undue influence and unconscionable conduct. A BFA protects only if it is made fairly, early, with genuine advice and without oppression.
Why “the beach house will always be yours” means almost nothing
A completed gift between partners is absolute. A genuinely conditional gift is possible but must be expressed as such, and vague conditions fail. The classic surviving example is the engagement ring, conditional on the marriage occurring (Papathanasopoulos v Vacopoulos [2007] NSWSC 502, following Cohen v Sellar). Once the marriage takes place, the condition is satisfied and the gift is absolute. Unexpressed expectations — “I transferred the house into joint names assuming we would stay together” — are not conditions at all.
Oral promises and informal understandings fail for several converging reasons. First, evidence: years later, memory is contested, self-serving and undocumented, and the court is left with word against word. Second, formality: dealings in land attract statutory writing requirements descending from the Statute of Frauds, and although equity can sometimes circumvent them through part performance, estoppel or constructive trust, each of those doctrines requires proof of detrimental reliance, not merely proof of the promise. Third, and decisively, the Family Law Act: even a proved oral agreement between spouses cannot oust s 79. Parliament permitted contracting out only through the strict machinery of BFAs, precisely because informal spousal bargains are so vulnerable to pressure and revision.
In a very short relationship, an oral understanding may effectively coincide with the outcome anyway — not because the promise is enforced, but because a short-relationship contribution analysis returns each party roughly to their starting position. In that narrow sense, a promise “works” in a two-year relationship. It never works in the long run. Over a long marriage the promise is progressively buried under decades of mutual contributions; children arrive; earning capacities diverge; and the just and equitable assessment simply overwhelms a conversation from twenty years earlier. The longer the relationship, the more the law substitutes its own evaluation of the whole partnership for whatever the parties once said to each other.
What the wealthier partner should actually do
The threads pull together into a short list of practical guidance:
- Do not rely on the presumptions. After Bosanac, these cases are decided on contemporaneous evidence of intention. Document why title is being structured the way it is, at the time, in writing.
- Do not assume anything is “excluded”. Within a marriage or qualifying de facto relationship, all property is on the table; pre-relationship wealth is protected, if at all, through the contribution analysis — powerfully in a short relationship, weakly in a long one.
- If certainty matters, only a binding financial agreement provides it — negotiated early, on fair terms, with genuine independent advice on both sides, and never in the shadow of a wedding date.
- Put nothing of significance in a partner’s name — or joint names — without advice first. It is far easier to structure ownership correctly at purchase than to unscramble it in litigation years later.
The equitable presumptions have inverted their original social effect: today they largely favour the woman who funds assets held in her partner’s or joint names. But within a marriage or qualifying de facto relationship they are eclipsed by the Family Law Act, under which the source of funds is a contribution — decisive in a short relationship, diluted almost to vanishing in a long one. A woman entering a relationship with significant wealth should document everything, consider a BFA early and on fair terms, and take advice before, not after, the assets change names.
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