What is prenup meaning under Australian family laws? A prenup (“prenuptial agreement” or “premarital agreement”) is a legally binding financial agreement between two people who wish to get married, or who are in a de facto relationship. Parties can enter into this before or during a marriage or de facto relationship.
A premarital agreement may also contain provisions for a surviving spouse to claim an elective share of the estate of the deceased spouse. The Family Law Act 1975governs the rules pertaining to prenup meaning and all other matters related to it.
The Prenup Meaning Under the Law
In Australia, prenup meaning is governed by what the law calls a Binding Financial Agreement (BFA). These agreements are drafted at the beginning of a relationship, and their purpose is to set out how assets will be divided should a couple decide to end the relationship.
Sections 90B–90KAof the Family Law Act 1975 deal with financial agreements for parties who are married. Sections 90UA–90UN apply to de facto couples, including same-sex couples.
A prenup states what assets and debts each person brings into the relationship. It also lays out the manner of separating property in the event the relationship breaks down, whether by separation, annulment, or divorce. Critically, if a BFA is binding, it has the effect of excluding the jurisdiction of the Family Court from making decisions about the division of assets. This is a significant legal protection that many couples overlook entirely when weighing up whether to get a prenup.
What Does a Prenup Cover Under Australian Law?
Generally, a prenuptial agreement covers the division of a couple’s finances and marital property in the event of a relationship breakdown. Prenuptial agreements can include a wide variety of matters, including how assets and liabilities are to be divided upon separation.
A prenup can protect:
- Cash, real estate, superannuation, and investments
- Businesses, inheritances, and pension entitlements
- Pre-existing debts and liabilities
- Future assets such as expected inheritances or property acquisitions
A prenuptial agreement also includes provisions for spousal maintenance, and considers future financial matters such as new asset purchases. Importantly, prenup meaning in Australian law extends to child support provisions, which Family Court Orders ordinarily cannot cover. However, a BFA cannot include terms about the care and welfare of children, such as custody or parenting arrangements. These are handled separately under the Family Law Act.
Business owners in particular use prenups to protect their company from being liquidated or divided during a property settlement. Without a BFA in place, an operating business may be subject to valuation and division as part of a property settlement, which can threaten the ongoing viability of the business entirely.
Why Prenup Meaning Matters: Key Benefits of a Binding Financial Agreement
Some couples decide against getting a prenup because they feel it signals mistrust or sets the relationship up to fail. In reality, a prenuptial agreement can actually strengthen a relationship by clarifying financial expectations and removing uncertainty before they become points of conflict.
Prenuptial agreements are particularly useful in situations such as:
- A second marriage where you have assets from your first marriage to pass on to your children
- A de facto relationship where one party is moving into the other party’s property
- One party has significantly more property than the other when the relationship begins
- Couples who want to avoid the delay and lack of control that accompanies Family Court proceedings
Furthermore, prenups provide the following advantages:
Swiftness – Prenups facilitate a swift and smooth future divorce or separation by preventing heated disagreements. Without a prenup, couples may face lengthy and costly litigation.
Minimising costs – Separations and divorces can be costly. A prenup will significantly reduce legal fees and associated costs, providing an exit plan that both parties have already agreed upon calmly and rationally.
Protection – Prenups provide protection of valuable assets, including premarital property, family heirlooms, future inheritances, and family businesses. A prenup can also prevent one partner from becoming responsible for the other’s pre-existing debt.
Clarity and certainty – A prenup provides both parties with complete clarity on what will happen should the relationship end. Discussing a prenup helps couples agree on important financial matters in a calm environment before marriage, resulting in less confusion and far less conflict later.
Strengthening the relationship – A prenup forces the couple to have important discussions about their future, providing both parties with a clear understanding of each other’s financial intentions. This increases the chance of a successful and peaceful marriage.
It is also worth noting that couples of modest means are increasingly turning to prenuptial agreements for their own purposes. Prenups are not exclusively for the wealthy. They are a practical tool for anyone who wants financial clarity and certainty about their future.

What Happens If You Do Not Have a Prenup?
Many people do not realise that marriage is a legal contract that grants automatic property rights to each spouse. Without a prenup, the division of property in a divorce is governed by family law, which may not align with your preferences or intentions at all.
If you do not have a prenuptial agreement, the law determines who owns what during and after the marriage. In the absence of a prenup, the court decides how to divide assets and debts, which may not reflect what the couple would have wanted. One spouse may end up with a larger share of the marital property than the other, depending on the circumstances of the relationship. The absence of a prenup can also lead to protracted and expensive disputes over property rights and financial responsibilities.
A prenup can help avoid the emotional stress and uncertainty involved in negotiating a settlement during what is already a difficult time. It can also provide an exit plan in the event of a relationship breakdown, giving both parties a degree of control over an otherwise unpredictable process.
Prenup Meaning and Validity: Legal Requirements
It is often assumed that financial arrangements must follow a straightforward formula. However, you can decide on your own arrangements, provided both parties agree and those arrangements comply with the law.
To make a prenuptial agreement legally binding and enforceable, the following requirements must be met:
- The prenup must comply with the strict legal guidelines outlined in the Family Law Act 1975
- It must be a written contract signed by both parties
- Each person must have received independent legal advice before signing, from a lawyer practising in an Australian jurisdiction
- Each party must have signed the prenup voluntarily, free from coercion, duress, or undue influence
- The prenup must contain a complete disclosure of each person’s financial position, including all assets and liabilities
- The lawyers representing each party must sign the agreement to certify in writing that they have provided that independent legal advice
The requirement for independent legal advice can make prenups a more costly exercise than some couples anticipate. However, this cost is generally far outweighed by the expense of contested property proceedings in the Family Court if no agreement is in place.
When Can Courts Set a Prenup Aside?
Courts can set a prenup aside if they believe the agreement does not comply with the requirements of the law. Common reasons why courts set aside prenuptial agreements include:
Children – The agreement does not account for circumstances relevant to future children.
No independent legal advice – The Family Law Act 1975 requires all parties to have sought and received independent legal advice. Judges are more likely to uphold a prenuptial agreement when both parties had proper legal advice before signing.
Unconscionable conduct and duress – One party forced or pressured the other into signing. A well-known example is a partner who threatened to cancel a fully organised and paid-for wedding just days before it was due to take place unless the other party signed the agreement.
Non-disclosure – A party did not fully disclose the extent and value of their assets at the time of drafting and signing.
Unfairness – If the agreement is not just, fair, and equitable, courts can set it aside.
It is important to acknowledge that a prenup can, in some situations, be used as a means of exerting financial control by the party in a financially superior position. This is precisely why independent legal advice is not a mere formality. It is a genuine safeguard designed to protect both parties and ensure the agreement reflects a fair and voluntary arrangement.

The Importance of Seeking Legal Advice on Prenup Meaning
Preparing a prenuptial agreement requires a thorough understanding of prenup meaning, careful due diligence, and sound legal advice for it to be fully valid and enforceable. The law requires both partners to obtain independent legal advice before signing, and each lawyer must certify in writing that they have provided that advice.
JB Solicitors has a leading team of family lawyers who can help you with a prenup that adheres to Australian family property laws. We will ensure that you make arrangements to protect your assets, and that you enter into a financial agreement that is tailored and favourable to your circumstances. We can also answer any queries about prenup meaning under the law, as well as prenup costs.
Do you have further queries about postnuptial, postmarital, or marital agreements under Australian law? Contact our family law team today.
Frequently Asked Questions About Prenup Meaning in Australia
What is prenup meaning in Australia?
In Australia, prenup meaning refers to a Binding Financial Agreement (BFA) – a legally enforceable contract entered into before or during a marriage or de facto relationship that sets out how assets, debts, and financial resources will be divided if the relationship ends.
Is a prenup legally enforceable in Australia?
Yes, a prenup is legally enforceable in Australia provided it meets the requirements of the Family Law Act 1975, including being in writing, signed by both parties, and accompanied by signed certificates from independent legal advisers for each party.
Can a prenup cover child custody or parenting arrangements?
No. A BFA cannot include terms about the care and welfare of children, including custody or parenting arrangements. These matters are handled separately under the Family Law Act. A prenup can, however, include child support provisions that Family Court Orders ordinarily cannot cover.
What happens if I do not have a prenup?
Without a prenup, the division of assets and debts following a separation is determined by the Family Court. The court applies the law without regard to what you may have intended or preferred, which can produce outcomes that do not reflect either party’s wishes and can take years and significant expense to resolve.
Can a court set aside my prenup?
Yes. Courts can set a prenup aside if it does not comply with legal requirements, was signed under duress or coercion, involved non-disclosure of assets, or is found to be unjust or unfair to one party.
Do both parties need a lawyer for a prenup?
Yes. Both parties must receive independent legal advice from separate lawyers before signing a prenuptial agreement. Each lawyer must also sign a certificate confirming they provided that advice. This is a strict legal requirement for the agreement to be binding, not an optional formality.
Are prenups only for wealthy couples?
No. Couples of modest means are increasingly turning to prenuptial agreements. A prenup is a practical tool for anyone who wants financial clarity, whether that involves protecting a home, a small business, a specific debt arrangement, or assets intended for children from a previous relationship.
How much does a prenup cost in Australia?
The cost of a prenup in Australia varies depending on the complexity of the agreement and the assets involved. While the requirement for independent legal advice means there are upfront costs for both parties, the investment is generally far less than the cost of contested property proceedings in the Family Court. Contact JB Solicitors for guidance on prenup costs specific to your situation.