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Prenups & financial agreements

Binding Financial Agreements & Prenups, Sydney

A prenup, called a binding financial agreement in Australia, lets a couple agree in advance what happens to their property if they ever separate. It can be made before or during a marriage or de facto relationship, or after separating. Done properly, it gives both of you certainty.

How we can help

Our prenups & financial agreements lawyers can help you with

  • Prenups before marriage
  • Agreements for couples moving in together
  • Agreements during a marriage
  • Reviewing an agreement you have been asked to sign
  • Protecting a family home, business or inheritance
  • Checking an old agreement still works

Where you may be now

A sensible conversation, while you still agree on everything.

People ask us about prenups for good reasons. They own a home, or have savings or a business from before the relationship. Their parents have helped them financially. They have children from a previous relationship. Or they simply want to agree calmly, in advance, on what would be fair.

A prenup is only worth having if it holds up when it matters, often years later. Most agreements that fail do so because of how they were made: signed too close to the wedding, without full information, or without proper independent advice. We make sure yours is done properly, and we help you have the conversation with care.

How the law works

Financial agreements under the Family Law Act

Binding financial agreements are made under Part VIIIA of the Family Law Act 1975 (Cth) for married couples, and Part VIIIAB for de facto couples. They can deal with how property, financial resources and superannuation are divided, and with spousal maintenance.

An agreement is binding only if strict requirements are met. In summary:

  • it is in writing and signed by both parties;
  • before signing, each party received independent legal advice about the effect of the agreement on their rights, and its advantages and disadvantages to them at the time;
  • each party has a signed statement from their lawyer confirming that advice was given; and
  • the agreement has not been terminated or set aside.

If an agreement is binding, the court cannot make property orders inconsistent with it. It can, however, be set aside, for example for fraud or failure to disclose a material matter, for duress, undue influence or unconscionable conduct, or for a material change in circumstances relating to the care of a child that would cause hardship.

In Thorne v Kennedy (2017), the High Court set aside agreements signed shortly before a wedding where one party was under serious pressure and the terms were plainly unfavourable. The lesson is simple: timing, disclosure and genuine independence are not formalities.

What to include

What a good agreement covers

Things to think about

  • A clear list of what each of you owns and owes now
  • The family home, especially if one of you owned it before
  • Savings, super and investments
  • Money from parents, and future inheritances
  • A business or share in a family company
  • What happens if you have children, or stay together for many years

If either of you owns a business, the agreement should line up with any shareholders' agreement and with your wills, so everything points in the same direction.

How we help

Done properly, with care

Whether we act for the party seeking protection or for the party asked to sign, our aim is an agreement that is fair enough to be signed without resentment and robust enough to be enforced.

When you ask us to prepare an agreement, we draft it, manage disclosure, deal with your partner's lawyer, and supervise execution so that every formal requirement is met and evidenced. When you are asked to sign one, we give you clear, independent advice on what you would be giving up, negotiate improvements, and, if the agreement is unfair, tell you plainly.

We also review existing agreements, including those made years ago or overseas, and advise on whether they are likely to hold. Read more in Do prenups actually hold up in Australia?

Last reviewed 27 September 2026 · General information only, not legal advice

The process

Making an agreement that holds

The quality of the process is what protects the agreement if it is ever challenged. We build that protection in from the first step.
  1. Instructions

    We understand your assets, family background, business interests and what you want to protect, and why.

  2. Disclosure

    Both parties exchange financial disclosure, annexed to the agreement, so no one can later say they did not know.

  3. Drafting & negotiation

    We draft precisely, send the draft to your partner's independent lawyer, and negotiate changes.

  4. Advice & signing

    Each party receives independent legal advice and a signed certificate. Execution is completed well before the wedding.

Costs

How our fees work

You will know how your matter is being charged before any work begins, and you will not be surprised by an invoice.

Binding financial agreements are usually quoted as a fixed fee, scoped to the complexity of the assets and the extent of negotiation expected.

Every engagement starts with a written costs disclosure, as the Legal Profession Uniform Law requires. It sets out how we charge, an estimate of total costs, the variables that could change that estimate, and your rights to negotiate and to receive itemised bills. If the estimate changes materially, we tell you in writing before the work is done.

Where a stage of the work can be scoped (a binding financial agreement, a consent orders package, a will and estate plan), we will usually offer a fixed fee for that stage. Where the other side’s conduct drives the work, as it often does in litigation, we charge on a time basis against a clear budget and report against it.

Barristers, valuers, forensic accountants and other experts are engaged only with your approval, and their costs are quoted separately. Your first 30-minute consultation is free.

Frequently asked

Prenups & Financial Agreements: your questions answered

Do prenups hold up in Australia?

Yes, when they are prepared properly. A binding financial agreement is enforceable if it meets the formal requirements of the Family Law Act (including independent legal advice for each party and signed advice certificates) and there is no ground to set it aside, such as fraud, non-disclosure, duress, undue influence or unconscionable conduct. Most challenges succeed because of a defect in process, not because the terms were unusual.

Can a binding financial agreement be set aside?

Only on specific grounds in the Act. They include fraud (including failing to disclose a material matter), the agreement being void or unenforceable under general contract law (for example because of duress, undue influence or unconscionable conduct), circumstances making it impracticable to carry out, and a material change in circumstances relating to the care of a child that would cause hardship.

How long before the wedding should we sign?

As early as possible. There is no fixed rule, but the High Court has set aside an agreement signed days before a wedding, where one party had no real choice. We recommend beginning at least several months before the wedding, and completing signing well ahead of it.

Can we make a financial agreement after we are already married?

Yes. Agreements can be made before marriage, during marriage, after separation, and after divorce. The same formal requirements apply to each. De facto couples, and couples who are about to move in together, can also make them.

Can a financial agreement cover superannuation and spousal maintenance?

Yes. Agreements can deal with superannuation splits and with spousal maintenance. However, a court can disregard a maintenance clause if, when the agreement comes into effect, a party cannot support themselves without an income-tested government pension or benefit.

Can a prenup decide arrangements for our children?

No. Financial agreements cannot bind parenting arrangements; those are always decided by reference to the children's best interests. An agreement can, however, deal with property and maintenance in ways that anticipate children being born.

Should an old agreement be reviewed?

Yes. Agreements should be reviewed after major events: the birth of a child, a significant inheritance, the sale or growth of a business, or a move overseas. An agreement that no longer fits the relationship is more vulnerable to challenge and may not achieve what you intended.

Consultation

The first conversation may be the most important one you have this year.

Your first 30-minute consultation is free.

Telephone
02 9145 5266
Office
St James Trust Building, 185 Elizabeth Street
Opposite Hyde Park
Hours
Monday to Friday, 9.00am to 5.30pm. Online enquiries welcome 24/7.

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