Binding Financial Agreements in Australia
A comprehensive guide to Binding Financial Agreements (BFAs) in Australia under the Family Law Act 1975, including requirements, enforceability, and common pitfalls.
Binding Financial Agreements in Australia
In Australia, the equivalent of a prenuptial agreement is known as a Binding Financial Agreement, or BFA. Governed by the Family Law Act 1975, BFAs allow couples to define how their property, finances, and spousal maintenance will be handled if the relationship ends. While BFAs serve the same fundamental purpose as prenups in other countries, Australia's legal framework imposes unique requirements, creates specific risks, and demands careful attention to process.
Australia has one of the highest rates of BFA invalidation among developed nations, which makes understanding the rules — and following them precisely — essential.
Legal Framework
BFAs are authorized under Part VIIIA of the Family Law Act 1975. The Act provides for three types of financial agreements based on timing:
- Section 90B: Before marriage. This is the pre-marriage BFA — the Australian equivalent of a prenup. It is entered into by parties who are contemplating marriage but have not yet married.
- Section 90C: During marriage. This is the equivalent of a postnuptial agreement. It can be entered into at any time while the parties are married.
- Section 90D: After divorce. This is entered into after the marriage has ended, to govern the final division of assets.
Each type of BFA is subject to the same core requirements, but the timing affects what can be addressed and how the agreement interacts with the rest of family law.
Key Requirements
For a BFA to be valid and enforceable, the following requirements must be met:
Written Agreement
The BFA must be in writing and signed by both parties. Oral agreements have no legal effect.
Independent Legal Advice
This is the most critical requirement and the one most frequently litigated. Each party must receive independent legal advice from a separate solicitor about:
- The effect of the agreement on their rights.
- Whether the agreement is to their advantage or disadvantage.
- Whether, at the time the advice was provided, it was prudent for the party to enter into the agreement.
- Any other matters the solicitor deemed relevant.
Solicitor's Certificate (Annexure)
After providing legal advice, each solicitor must sign a certificate — commonly called an Annexure — confirming that they provided the required advice. The Annexure must be attached to the BFA. A BFA without properly executed Annexures is invalid.
The Annexure requirements are highly technical. The certificate must state that the solicitor provided advice about the specific matters listed in the legislation. A certificate that is vague, incomplete, or that paraphrases the statutory requirements (rather than addressing them directly) may be insufficient.
No Duress or Undue Influence
Both parties must enter the agreement freely, without duress, undue influence, or unconscionable conduct. Courts will examine the circumstances: Was there pressure to sign? Was one party in a vulnerable position? Was there adequate time for reflection?
Full Financial Disclosure
While the Act does not explicitly mandate financial disclosure for BFAs (unlike court orders), courts have consistently held that a BFA entered into without full disclosure is more vulnerable to challenge. Full disclosure of assets, liabilities, income, and financial resources is strongly recommended and is effectively a de facto requirement for enforceability.
Property Division Without a BFA
To understand why a BFA matters, it helps to understand what happens without one. When a relationship ends in Australia and there is no BFA, property is divided through a four-step process established by the Family Court:
- Identify and value the property pool. This includes all assets and liabilities of both parties, regardless of whose name they are in.
- Assess contributions. The court evaluates each party's financial and non-financial contributions (including homemaking and parenting) to the acquisition, conservation, and improvement of property.
- Consider future needs. Factors include age, health, earning capacity, care of children, length of the relationship, and each party's financial resources and needs.
- Determine a just and equitable outcome. The court arrives at a division that it considers fair in all the circumstances.
What a BFA Can Cover
A BFA can address:
- How property will be divided — including real estate, bank accounts, investments, vehicles, and personal property.
- How debts and liabilities will be allocated — mortgages, loans, credit card debts, and tax obligations.
- Spousal maintenance — whether one party will pay maintenance to the other, and if so, the amount and duration.
- Superannuation (retirement) — how superannuation interests will be treated. Note that superannuation splitting under a BFA has specific procedural requirements.
- Financial arrangements during the relationship — contributions to household expenses, savings targets, and financial management roles.
What a BFA Cannot Cover
- Parenting arrangements. A BFA cannot determine custody (legally called "parenting orders" in Australia), living arrangements, or child support. These are always determined by the court based on the best interests of the child under Part VII of the Family Law Act.
- Child support. Child support is calculated under the Child Support (Assessment) Act 1989 and cannot be contracted out of through a BFA.
- Terms that are illegal, unconscionable, or contrary to public policy.
Superannuation
Superannuation (Australia's compulsory retirement savings system) is often one of the largest assets in a relationship. A BFA can address superannuation splitting, but the process involves specific steps:
- The BFA must include a "superannuation agreement" that complies with the Family Law Act and Family Law (Superannuation) Regulations 2001.
- The trustee of the superannuation fund must be served with the agreement.
- Certain types of superannuation interests (particularly defined benefit schemes) require actuarial valuation.
Setting Aside a BFA Under Section 90K
Section 90K of the Family Law Act sets out the grounds upon which a court can set aside (invalidate) a BFA. This is where many BFAs fail. The grounds include:
Fraud
If one party engaged in fraud — including material non-disclosure of assets or income — the court may set aside the agreement.
Void, Voidable, or Unenforceable
If the agreement is void (for example, because it lacked proper Annexures), voidable (because of duress or undue influence), or unenforceable under general contract law principles, the court may set it aside.
Changed Circumstances Relating to Children
If there has been a material change in circumstances relating to the care, welfare, and development of a child of the relationship, and the child (or the caring parent) would suffer hardship if the agreement were enforced, the court may set it aside.
Unconscionable Conduct
If one party engaged in unconscionable conduct — taking unfair advantage of the other party's vulnerability, ignorance, or weaker bargaining position — the court may invalidate the agreement.
Impracticability
If a provision of the BFA is impracticable (impossible or impractical to carry out), the court may set aside the agreement or the specific provision.
Failed Requirements
If the agreement did not comply with the formal requirements — particularly the Annexure requirements — the court may set it aside. This is one of the most common grounds for invalidation in Australia.
The high invalidation rate of Australian BFAs is driven largely by technical failures — defective Annexures, inadequate legal advice, and procedural shortcuts. Working with experienced family law solicitors is not optional; it is essential.
De Facto Relationships
Australia extends its BFA framework to de facto relationships (couples who live together in a genuine domestic relationship without being married). The provisions are found in Part VIIIAB of the Family Law Act and mirror the married couple provisions:
- Section 90UB: BFA before de facto relationship.
- Section 90UC: BFA during de facto relationship.
- Section 90UD: BFA after de facto relationship ends.
For same-sex couples, BFAs are available on the same terms as for heterosexual couples, following the legalisation of same-sex marriage in Australia in 2017.
Cost
BFAs in Australia tend to be more expensive than prenups in other countries, reflecting the stringent legal requirements:
| Factor | Typical Range |
|---|---|
The cost reflects the mandatory independent legal advice requirement, the complexity of drafting Annexures that withstand scrutiny, and the time needed for thorough financial disclosure and negotiation.
While the upfront cost is significant, it is a fraction of what contested property proceedings would cost — typically AUD $30,000 to $100,000+ per party for a full Family Court trial.
For international cost comparisons, see our prenup cost guide.
Common Pitfalls
Australian BFAs fail more often than prenups in other jurisdictions. The most common reasons include:
- Defective Annexures. The solicitor's certificate must specifically address the matters required by the Act. Boilerplate or vague certificates have been held insufficient by courts.
- Shared legal representation. Each party must have their own solicitor. Using the same solicitor — even if they provide separate advice sessions — invalidates the BFA.
- Inadequate legal advice. The solicitor must genuinely advise the party, not merely explain the terms. Courts have set aside BFAs where the advice was rushed, superficial, or did not cover whether the agreement was prudent.
- Duress or pressure. Signing under time pressure, emotional manipulation, or with an ultimatum (such as "sign or the wedding is off") can be grounds for setting aside.
- Incomplete financial disclosure. While not a statutory prerequisite, courts consistently find that non-disclosure supports setting aside under fraud or unconscionability grounds.
- Failure to update. A BFA drafted before marriage may not account for children, career changes, or significant wealth accumulation. Regular review and updating are essential.
- Poor drafting of superannuation clauses. Superannuation splitting has specific regulatory requirements that must be met precisely.
Steps to Create a BFA in Australia
- Start early. Begin at least three to six months before the wedding. The independent legal advice requirement and Annexure process take time.
- Identify key issues. Use our prenup generator to explore priorities and create a preliminary framework.
- Compile full financial disclosure. Gather comprehensive documentation of all assets (including superannuation statements), liabilities, income, and financial interests.
- Retain independent solicitors. Each partner must engage their own family law solicitor who is experienced in drafting BFAs. Ensure the solicitor understands the Annexure requirements thoroughly.
- Draft and negotiate. Work through the terms collaboratively. Aim for fairness — unconscionable terms invite challenge.
- Receive formal legal advice. Each solicitor meets with their client to provide the required advice about the effect, advantages, disadvantages, and prudence of the agreement.
- Execute the BFA and Annexures. Both parties sign the agreement. Each solicitor signs the Annexure certificate. Ensure all documents are properly executed and attached.
- Store securely. Keep the original in a safe location. Provide copies to both parties and both solicitors.
- Review and update. Schedule reviews every three to five years and after major life events (birth of children, property purchases, business changes, relocations). Update through a new BFA if needed.
For more general information about prenuptial agreements, see our articles on what a prenup is, why prenups matter, and our guides for other jurisdictions including the United States and the United Kingdom.