Binding financial agreements in Australia: prenups that actually hold

Australians rarely call them prenups, but the instinct is the same: to decide privately, in calm times, how property would be divided if the relationship ended. The Family Law Act allows exactly that through a binding financial agreement — a powerful tool with strict formalities, a documented failure rate when done cheaply, and a very particular place in a sensible financial life. Here is how BFAs really work.

What a binding financial agreement is

A binding financial agreement (BFA) is a private contract between partners — married or de facto — that deals with how property, superannuation and financial resources would be divided on separation, and can also deal with spousal maintenance. Its defining feature is what it excludes: a properly made BFA ousts the court's power to divide your property under the usual just-and-equitable framework. You are choosing your own rules in place of the court's. That is precisely its appeal, and precisely why the law surrounds it with formality.

When you can make one

• Before marriage or cohabitation — the classic "prenup", often protecting assets built before the relationship, an expected inheritance, or children of a first marriage.
• During a relationship — commonly where circumstances change: a business is founded, an inheritance lands, or a couple reconciles on agreed financial terms.
• After separation or divorce — as one of the two ways to finalise a property settlement without going near a courtroom.

De facto couples, including same-sex couples, have their own mirror provisions. The timing changes the drafting, not the essential machinery.

The non-negotiable formalities

For a BFA to bind, each party must receive independent legal advice — from separate lawyers — about the effect of the agreement on their rights and its advantages and disadvantages, before signing. Each lawyer signs a statement confirming the advice; the statements are exchanged; the agreement is signed by both parties. Skip or shortcut any element and the "binding" in the title evaporates. This is not a document you can buy as a template, sign at the kitchen table and expect to hold a decade later against a well-advised challenge.

When courts set BFAs aside

Courts can, and do, set aside financial agreements. The recognised grounds include fraud and non-disclosure of significant assets; the agreement being signed under duress, undue influence or unconscionable pressure — the wedding-eve ultimatum is the notorious example; impracticability arising from changed circumstances; and a material change concerning the care of a child that would cause hardship. The High Court's treatment of pressure in this territory reset drafting practice across the profession. The lesson is not that BFAs are futile — it is that they must be prepared unhurriedly, on full disclosure, with genuinely independent advice on both sides, and reviewed when life changes.

BFA or consent orders?

Separated couples finalising property have two instruments. Consent orders are approved by the court, which checks the deal is just and equitable — approval brings the court's authority and near-bulletproof finality. A BFA involves no court and no fairness check, which makes it faster and more private, and suits deals a court might hesitate to bless — or couples who have not yet separated at all, where consent orders are unavailable. Broadly: consent orders are the default for post-separation settlements; BFAs earn their keep before and during relationships, and in bespoke situations. We advise on which fits, not which is fashionable.

What a good agreement covers

• A complete, honest schedule of each party's assets, liabilities and super — disclosure is the foundation stone.
• How existing assets are quarantined, and how property acquired together is shared.
• Treatment of the home, businesses, trusts and inheritances — received and expected.
• Superannuation, including any splitting arrangements.
• Spousal maintenance, to the extent the law allows it to be dealt with.
• Review triggers: marriage, children, ten years' passage. Agreements written for a two-year relationship age badly over twenty.

The conversation is the hard part

Raising a BFA with someone you love can feel like planning the funeral at the engagement party. In practice, couples who navigate it well treat it as financial transparency rather than distrust: both partners see everything, both get independent advice, both know where they stand. Done early — months before a wedding, not weeks — it becomes one honest conversation instead of a standing grievance.

Questions we are asked about BFAs

Is a prenup romantic poison? Our observation is the opposite: the couples who struggle with the conversation usually struggle with money transparency generally. The agreement forces the full financial picture onto the table once, early, with advisers in the room — which is a healthier foundation than discovering each other's debts in year six.

Can one lawyer act for both of us to save money? No — and any arrangement that pretends otherwise produces an agreement built to fail. Independence of advice is the load-bearing wall of the whole structure.

My partner handed me an agreement two weeks before the wedding. Now what? Slow everything down. Signing under that kind of pressure is precisely what courts examine when agreements are challenged. Genuine review takes time; a wedding date is not a legal deadline.

We signed one years ago and never updated it. Does it still work? Perhaps — but children, business sales and property purchases can strain an old agreement's assumptions, and a material change in a child's circumstances is a statutory ground for setting agreements aside. Reviews are cheap; challenges are not.

Where we fit

Spencer Alexander Lawyers drafts financial agreements, provides the independent advice and certificate for agreements drafted elsewhere, and advises on setting aside agreements that should never have been signed. Fees are quoted in writing before we begin. If your situation is post-separation, read how property is divided and the 2025 reforms first — then talk to us about which instrument, BFA or consent orders, actually serves you. More at our family law page.

The bottom line

A binding financial agreement is neither romance insurance nor a magic shield — it is a serious contract that rewards serious preparation. Made early, honestly and with genuinely independent advice, it holds. Made under pressure with recycled templates, it fails exactly when needed. Decide which kind you are making before you start.

This guide reflects the law applying in Victoria as at July 2026. It is general information only, not legal advice, and does not take your circumstances into account.