What is a Prenup? Meaning, Cost and Australian Rules

What a Prenup is Called in Australia

Australian law calls a prenup a financial agreement, commonly described as a binding financial agreement or BFA when it meets the binding requirements. A prenuptial agreement is the before-marriage form. Section 90B of the Family Law Act 1975 provides its legal basis.

The agreement can decide how existing property and property acquired later will be dealt with after separation. It can also deal with spousal maintenance, which is financial support for a spouse. Couples can make other financial agreements during marriage or after separation, but an engaged couple needs the form that covers their intended marriage.

For example, a business owner can agree how an existing shareholding will be treated if the marriage ends. The drafting must also address later growth and any agreed entitlement for the other spouse. Simply naming the business does not explain what happens to its increased value.

Is a Prenup Legally Binding in Australia

Yes, Australian law recognises a binding prenup when the agreement meets the legal requirements and has not been terminated or set aside. Signing a document with that label alone is insufficient.

The usual process follows these steps.

1. Each person engages their own independent lawyer and explains the proposed arrangement.
2. Both parties disclose their finances and negotiate a written agreement under the correct law.
3. Before signing, each person receives independent advice about the agreement’s effect on their rights and the advantages and disadvantages of entering it.
4. All parties sign the final agreement after receiving that advice.
5. Each lawyer supplies a signed statement confirming the advice. A copy goes to the other party or their lawyer.
6. Both parties retain the executed agreement, advice statements and disclosure records.

The signed advice statement can be supplied before or after signing. The advice itself must come first. A missing formal step can mean the agreement does not bind either party. Although the legislation gives courts a limited power to cure some defects, couples must not plan around that possibility.

The full financial agreement requirements explain these formalities across agreement types. Each lawyer needs the same final version for advice and signing, so further changes require attention before execution.

How Much a Prenup Costs in Australia

Published Australian legal fee examples run from $2,200 including GST for drafting to $4,950 including GST in a broader agreement fee schedule. These are fees for different scopes, not a national average or a complete budget for both partners.

Firm and published service	Fee in Australian dollars	Scope to compare
Adams United Lawyers, prenup drafting	$2,200 including GST	Tailored draft, disclosure review, negotiation and amendments. Its separate review service is $990 including GST.
Ahern Sierakowski Lawyers, Perth, preparation	From $2,800 excluding GST, or $3,080 including GST	Preparation includes advice and a certificate. Review of another lawyer’s agreement starts at $1,500 excluding GST, or $1,650 including GST.
JB Solicitors, 2022 published schedule	$2,750 to $4,950 including GST	Historical financial agreement fee range. The schedule does not state that it pays for both parties’ independent lawyers.

The amounts come from Adams United’s prenup fees, Ahern Sierakowski’s fixed fees and JB Solicitors’ published fee schedule.

Budget for each party’s own lawyer. A preparation quote does not automatically include the other person’s advice or every later negotiation. A written scope must distinguish drafting, your advice, the other party’s advice and additional amendments.

A simple prenup might cover separate savings, an existing home, debts and the treatment of future joint purchases. A business or trust adds questions about ownership, control and valuation. Overseas assets, several entities or disputed terms can require more work. The asset pool’s size matters through that complexity, rather than a universal percentage charge.

A low quote leaves a gap if it covers only a template or draft while excluding independent advice. Another gap arises when a quote assumes agreed terms but the parties still need substantial negotiation. Compare the work included before comparing the headline fees.

When to Sign Before the Wedding

Begin the prenup process well before the wedding, leaving time for disclosure, negotiation and independent advice without a deadline forcing either person’s decision. There is no universal number of days that makes an agreement safe.

In Thorne v Kennedy, the agreement was signed four days before the wedding. The bride depended on her fiancé and was told the wedding would not proceed unless she signed. She signed despite independent advice against the agreement. The High Court set the agreements aside.

The practical risk is the combination of pressure and unequal bargaining power. Wedding arrangements, financial dependence and a threat to end the relationship can affect whether a person has a real choice. A lawyer’s involvement does not remove that pressure by itself.

Allow both people to request changes or decline terms. If a late proposal prevents a free decision, postponing signature is safer than treating the wedding as the signing deadline. The grounds for setting aside an agreement explain the separate legal questions when validity is challenged.

What to Include in a Prenup

A prenup needs terms explaining the property and financial arrangements the couple wants to apply if the marriage ends. An asset list records the starting position, while operative clauses explain the future outcome.

Discuss these distinct subjects with your lawyers.

• Assets and debts each person brings into the marriage, including how separate property’s growth will be treated.
• Future inheritances and family gifts, including what happens if the money pays a joint mortgage.
• Business ownership and trust interests, with ownership distinguished from control or expected distributions.
• Superannuation and any intended treatment of each person’s retirement interests.
• Spousal maintenance and the terms governing financial support.
• Property bought together, mortgage repayments and the method for dividing or selling it.
• Reduced income or time out of paid work to care for children, including any agreed financial response.

A prenup can address financial consequences of having children. Parenting arrangements and child support require their own legal treatment and cannot be fixed conclusively by a prenup. HHG Legal Group’s explanation of agreement scope distinguishes these subjects.

For a hypothetical couple, one person brings a home into the marriage and both later repay its mortgage. The agreement needs to say how those repayments affect each person’s entitlement. It also needs to explain whether refinancing or selling the home changes the arrangement.

An infidelity clause is unlikely to provide an enforceable financial penalty for cheating. Australia’s no-fault approach and the difficulty of defining and proving the behaviour create problems. Lavan’s analysis of infidelity clauses explains those risks. Keep the agreement focused on workable financial terms.

Disclosure Before Signing a Prenup

Each party must give the other a full account of their finances before signing, so the agreement and advice rest on an informed starting position. Material non-disclosure can later undermine the agreement.

Provide an asset and liability schedule with supporting records. Include bank accounts, loans, investments and superannuation, along with business records and trust interests where relevant. Income evidence and explanations of unusual transactions help each lawyer understand the finances behind the proposed terms.

Keep the disclosure bundle and a record of what each person received. A structured ledger from both parties’ bank statements makes that history easier to follow. Record the account holder, statement period, opening and closing balances, transactions and source file references. Retain the original PDFs beside the ledger.

For example, a disclosed transfer between two listed accounts can be traced to both statements. If a later dispute alleges an undisclosed payment, the retained ledger and exchange records help establish what was supplied before signing. The ledger records the disclosed statements. The asset schedule also needs property and interests that bank transactions alone do not describe.

FinTrace saves lawyers and forensic accountants hours of statement conversion and review by turning supplied PDFs into a searchable ledger and a clear findings report. It flags suspicious transactions and gaps in the supplied statements, with each finding connected to its source PDF and page. That gives the professional a usable disclosure record and the supporting evidence together.

How Long a Prenup Lasts

A prenup has no automatic statutory expiry after a set number of years of marriage. Its duration depends on its terms and whether it is lawfully ended, replaced or set aside.

A sunset clause specifies when agreed terms stop operating, such as after a defined period or event. The drafting must explain which provisions end and what happens afterwards. A review clause can require the parties to reconsider the agreement without automatically terminating it.

Review the arrangement after having children, establishing a business or receiving a large inheritance. A change in income can also make the original assumptions unsuitable. Review does not itself rewrite the signed terms.

Section 90J provides for termination through another financial agreement or a written termination agreement. The termination process has its own formal requirements, including independent advice. An informal promise to ignore the prenup does not complete that process. The financial agreement provisions of the Act explain the statutory framework.

Prenups for De Facto Couples

De facto couples can make an equivalent financial agreement before or during their relationship. In participating jurisdictions, the federal provisions cover agreements before the relationship under section 90UB and during it under section 90UC. Section 90UJ governs when they bind.

A federal de facto financial agreement ceases to be binding when the parties marry each other. It does not automatically become a prenup for their marriage. Couples planning to marry need drafting that addresses the marriage separately.

Farrar Gesini Dunn’s explanation of agreements covering both relationships describes how one document can address the de facto and marriage periods. Its separate legal bases must work for the relevant period. A general reference to a future wedding is insufficient by itself.

WA de facto couples fall under the Family Court Act 1997 (WA), rather than the federal de facto scheme. The Family Court of Western Australia’s legislation guide explains that distinction. Married couples in WA use federal marriage law. If you live together in WA and intend to marry, both stages need attention in the legal advice.

The de facto relationship guide explains how the relationship is assessed. Couples can also make financial agreements after separation, but those address a different stage of the relationship.

Prenup Templates

A free Australian prenup template cannot make an agreement binding on its own. An overseas template can also apply the wrong legal system. Neither replaces the independent advice each party must receive before signing.

A lawyer reviewing a template-based draft checks the applicable jurisdiction and agreement type first. The review then considers the disclosed finances, the terms’ legal effect and whether the intended outcome is expressed clearly. Business and trust interests need wording suited to their ownership and control. Maintenance terms and any superannuation arrangements need their relevant formalities.

The lawyer also checks how the draft deals with joint purchases and future changes such as children. They assess whether either person is under pressure to sign. Advice statements and execution requirements remain necessary after the document is revised.

Bring your proposed terms and financial records to separate lawyers before committing to a draft. Ask for a scope covering the final agreement, independent advice and signing, with enough time for both people to make a free decision.

What the Agreement Does Before Marriage

A pre-marriage financial agreement records the financial terms a couple intends to apply if their marriage ends. Its intended effect depends on meeting Australian statutory requirements. A signed contract labelled “prenup” does not establish that those requirements are met.

Before the wedding, each family lawyer uses the disclosed records to explain what the proposed terms mean for their client. A bank ledger can show existing savings, mortgage repayments and transfers into a business. The lawyer reads those figures alongside title records, valuations and the proposed clauses to explain which property each person would retain or share.

For the business owner bringing shares into the marriage, compare the disclosed shareholding and loan balances with the clauses governing future growth. Resolve any difference between the financial records and the proposed terms before receiving final advice and signing.