When you enter a new relationship after a separation or divorce, you often carry financial baggage from the last one: a share of a property settlement, a business interest, superannuation rebuilt over years, or even ongoing spousal maintenance payments. Many people assume those assets are clearly "pre-relationship" and therefore safe. Australian family law doesn't work that way, and a prenup is often the most direct tool for protecting what you've already worked hard to keep.
Why prior-relationship assets aren't automatically protected
Under the Family Law Act 1975, the full asset pool is assessed at the time of a relationship breakdown, not at the time each asset was acquired. A property payout you received three years ago sits in the same pool as the car you bought together last year. Courts look at contributions from both parties across the relationship, and your prior assets can be treated as a financial contribution you made, but they don't disappear from the equation entirely.
The longer a new relationship lasts, the more the origin of an asset tends to fade in weight. A court may still note that a particular asset predates the relationship, but that note carries less force after a decade together than it would after two years. Getting a prenup in place early is far more effective than relying on a judge to infer the right outcome later.
What a prenup can do in this situation
A binding financial agreement (BFA) can specifically identify assets that came from a prior relationship and state how they are to be treated if the current relationship ends. The agreement can include the following provisions.
- Asset identification. Naming specific assets by description, estimated value, and provenance, including noting that they were received via a prior property settlement or divorce.
- Exclusion from the asset pool. Stating that the nominated assets are to remain the sole property of the original owner, regardless of relationship length or financial contributions by the other party.
- Growth and income treatment. Addressing whether any growth in the value of those assets during the relationship is also excluded, or whether it forms part of a shared pool.
That last point trips people up. An asset identified in a prenup as "separate" can still generate income or appreciate considerably over time. Without a clear clause covering growth, disputes tend to focus on exactly that gap.
Children from a former relationship add complexity
If you have children from a prior relationship and you're entering a new one, a prenup becomes even more relevant. Assets you intend to pass to those children, including real property, business interests, or superannuation death benefits, can be drawn into a property settlement with a new partner if the relationship breaks down. A BFA can ring-fence those assets with that intention documented. It won't override parenting arrangements, and it won't override a valid will, but it can support both.
Rockwell Family Law Services regularly advises clients with blended family arrangements where the interests of children from prior relationships need to sit alongside fresh financial commitments to a new partner. A prenup protecting a stepparent's assets is one common approach, but the same logic applies when you are the biological parent trying to protect what you bring into the relationship for your own children's benefit.
The enforceability question
A prenup that identifies prior-relationship assets is only as strong as the agreement itself. Australian law requires each party to receive independent legal advice before signing. The agreement must be in writing, signed by both parties, and accompanied by statements from each party's lawyer confirming that advice was given. Skipping any of these steps gives the other party grounds to have the agreement set aside in court.
Rockwell Family Law Services also sees BFAs challenged on the basis that financial disclosure was incomplete at the time of signing. If you don't disclose the full value of what you're trying to protect, the agreement becomes vulnerable. Courts have set aside agreements where one party withheld information about the extent of assets received from a prior settlement, which is the opposite of what most people intend when they go to the effort of drafting a prenup in the first place.
For a clear breakdown of what makes an agreement hold up under scrutiny, see our guide on what makes a binding financial agreement enforceable.
Timing and the fresh-start problem
One practical issue: people often enter a new relationship while their previous property settlement is still being finalised. A prenup can still be signed at this point, but the assets it's meant to protect may not have a final value yet. In that case, the agreement typically needs to describe the expected outcome from the prior settlement and include a mechanism for updating the schedule of assets once the settlement is complete.
This isn't unusual. Rockwell Family Law Services drafts BFAs that accommodate pending settlements by including conditional clauses tied to the finalisation of prior proceedings. It's more complex, but the alternative, waiting until everything is settled before addressing the new relationship, often means the moment for a prenup has already passed.
What the prenup cannot do
A BFA cannot override a court's obligation to make orders in the best interests of children. It cannot guarantee a particular outcome if the financial circumstances of either party change dramatically after signing. It also cannot be used to waive future rights to spousal maintenance in a way that leaves one party without any means of support at the time they need it. Courts retain the power to set aside provisions that produce unjust outcomes, particularly when circumstances have shifted significantly since the agreement was signed.
Rockwell Family Law Services works with clients to draft prenups that are realistic, specific, and capable of holding up to scrutiny, not aspirational documents that look good at signing but fall apart when tested.
Getting started
If you're entering a new relationship and you have assets from a prior one you want to protect, the time to act is before the relationship deepens, not after it becomes complicated. Contact Rockwell Family Law Services to discuss your situation and what a binding financial agreement can realistically do for your specific asset profile.