What Is a Prenup in Australia? The Complete Guide

📜 What is a prenup in Australia?🔗

A binding financial agreement is a private contract between two people that sets out, in advance, how their assets and liabilities will be divided if the relationship breaks down. It can also cover spousal maintenance, whether one person will financially support the other after separation, and on what terms.

Courts always keep jurisdiction over children, full stop. No private contract can override a child's right to appropriate financial support or care arrangements. Try to squeeze child-related terms into a BFA and those clauses simply won't be enforceable.

⚖️ Does it actually hold up in court?🔗

🎯 The essential: Yes, if it meets the requirements in the Family Law Act 1975. The word "if" is doing a lot of work in that sentence.

For a BFA to be binding, it generally must be in writing, signed by both parties, and each party must have received independent legal advice from their own separate solicitor before signing, with a signed certificate confirming that advice was given and exchanged between the parties.

The independent legal advice requirement isn't negotiable. Each person engages their own lawyer, not the same one, and that lawyer has to actually advise them on the agreement's effect on their rights before they sign. A court can set an agreement aside where there was fraud (including failing to disclose assets), where the agreement is void, voidable or unenforceable under general legal principles (this is where undue influence or unconscionable conduct come in), where it's impracticable to carry out, or where circumstances relating to children have materially changed since signing in a way that would cause hardship if the agreement was enforced as written.

🗓️ Prenup, postnup, same thing🔗

There's no real legal difference. "Prenup" just means a BFA made before marriage. The same type of agreement can be made at several points in a relationship, each with its own naming convention.

De facto couples, including same-sex couples, have had access to binding financial agreements since 2009. The requirements for validity are essentially the same as for married couples. We cover the broader picture of de facto rights in de facto relationships and money.

💼 What it can and can't cover, in more detail🔗

• Pre-relationship property: the home you already owned, an investment property, savings, can be ring-fenced so it stays yours.
• Property acquired together: how jointly built-up assets get split.
• Inheritances and gifts: money or property from family during the relationship, which can otherwise end up in the shared asset pool.
• Business interests: your stake in a business, particularly important if a separation could otherwise destabilise it.
• Superannuation: often one of the largest assets either person holds.

What it cannot touch: anything about children. Child support runs on separate legislation, and parenting arrangements are always subject to the court's oversight of what's in the child's best interests.

🎯 Who should actually consider one🔗

A BFA isn't really about distrust. It's about clarity, having the honest money conversation before emotions run high. Strong candidates include people with a significant asset gap between partners, business owners, people with kids from a previous relationship, anyone expecting a meaningful inheritance, and people entering a second marriage with more assets and more complexity to protect.

Couples with minimal assets, no children from earlier relationships, and roughly equal financial positions probably don't need one, though that calculus shifts as wealth grows. Moneysmart notes that if you have assets you want to protect, like property or super, a binding financial agreement is worth considering. The key is going in with clear eyes about what it can and can't actually do. A BFA protects what happens if the relationship ends. If you also want your assets to go where you intend if something happens to you, our guide to estate planning in Australia covers the other half of that protection.

A BFA works best as one part of a much broader money conversation, not a substitute for one. If you're still working out how well you and your partner are aligned on money more generally, our financial compatibility guide covers the conversations worth having before things get serious, including when a BFA might genuinely be worth raising.

🧭 How you actually get one🔗

1. Full disclosure. Both parties disclose all assets and liabilities, property, savings, super, debts, business interests, trusts, everything. Hiding assets is grounds for a court to set the agreement aside later.
2. Separate solicitors. Each party engages their own independent family law solicitor.
3. Drafting and review. Typically one side's solicitor drafts the agreement, the other reviews it and may negotiate changes.
4. Advice and signing. Each solicitor advises their client, signs a certificate confirming it, and both parties sign the agreement itself.
5. Safe storage. A BFA doesn't need to be filed with a court. Both parties keep a copy, and so does each solicitor.

Curious what all of this actually costs? See our full breakdown in how much a prenup costs in Australia.

🧐 Common myths, cleared up🔗

Myth: signing a BFA means you expect the relationship to fail. Most family lawyers would push back on that framing. It's closer to buying insurance, you're not planning for disaster, you're just not leaving a major financial question entirely to chance.

Myth: a BFA is bulletproof once it's signed. Not quite. It's only as strong as the process behind it, correct legal advice, full and honest disclosure, and the right sections cited. A sloppy one can be picked apart in court just as easily as having no agreement at all.

Myth: you only need one if you're wealthy. Wealth raises the stakes, but it isn't the only reason people get one. Business owners, people supporting kids from an earlier relationship, and anyone who wants a clear-eyed conversation about money before things get serious all have reasons to consider it, regardless of the numbers involved.

Myth: once you're married, it's too late. It isn't. A postnup made during the marriage carries exactly the same legal weight as one made beforehand, provided it meets the same requirements.

🚪 What happens without one🔗

If there's no BFA, the Family Law Act 1975 applies by default when a relationship ends. The Federal Circuit and Family Court of Australia weighs each person's financial and non-financial contributions, future needs like age, health and care of children, and everything in the shared asset pool, including super.

There's no automatic 50/50 split, the court assesses what's just and equitable in the circumstances. But there's also no automatic protection for assets you brought into the relationship. A home you owned before you met your partner can become part of the shared pool, particularly in a long relationship. That's the exact gap a BFA is designed to fill.

❓ Frequently asked questions🔗