A prenup is often treated as a snapshot: a document that locks in what each person owns right now and determines how those existing assets are handled if the relationship ends. That view is only partly right. Under Australian family law, a binding financial agreement can extend well beyond your current balance sheet, but doing so correctly requires deliberate drafting and a clear understanding of what the law actually permits.
What "future assets" actually means
Future assets are any assets you or your partner acquire after the agreement is signed. That covers a wide range, including property bought during the relationship, business interests you build post-wedding, inheritances received later in life, superannuation accumulated through working years, share portfolios, and proceeds from selling a pre-existing asset and reinvesting them.
The category also includes passive growth. A business you own today might be worth $500,000 at signing. If Rockwell Family Law Services were drafting your agreement, the lawyers would need to address whether the increase in that value over ten years is treated as a shared asset or stays with the original owner. That question sits at the heart of future-asset clauses.
What Australian law says
The Family Law Act 1975 governs binding financial agreements (BFAs) in Australia. The Act does not prohibit parties from agreeing on how future-acquired property will be treated. It does, however, require the agreement to be sufficiently specific to be enforceable. Vague clauses like "all future property remains separate" have a poor track record in court because they don't distinguish between property genuinely kept separate and property that becomes intertwined with shared finances during the relationship.
The Family Court has set aside BFAs where future-asset clauses were so broad that they effectively defeated any fair consideration of the circumstances at the time of breakdown. Specificity is not optional. It's the difference between a clause that holds and one that doesn't.
Common approaches to drafting future-asset provisions
Skilled family lawyers use a few standard structures when addressing future assets in a BFA:
- Category-based exclusions: The agreement specifies that assets falling into a named category (for example, any inheritance received by either party) remain the sole property of the recipient, regardless of when they are received.
- Proportional treatment: Instead of excluding future assets entirely, the agreement sets out a formula. Growth in value attributable to joint effort is treated differently from passive appreciation.
- Review triggers: Some agreements build in defined events (the birth of a child, a career break, one partner starting a business) that trigger a renegotiation of how future assets will be treated from that point.
Each approach has trade-offs. Category-based exclusions are clean and easy to enforce but can produce unfair outcomes if circumstances change dramatically. Proportional formulas are fairer in theory but expensive and contentious to calculate at breakdown. Review triggers add flexibility but require both parties to co-operate at a point when the relationship may already be under strain.
Inheritance: the most common future asset question
Inheritance is the future asset couples ask about most. Many people enter a relationship knowing a significant inheritance is likely and want to protect it before it arrives. A BFA can address this. The agreement can specify that any inheritance received by either party, regardless of timing, is excluded from the joint asset pool and not subject to division.
Courts in Australia have generally respected these clauses when the agreement was properly executed and the clause was clearly worded. The protection isn't absolute. If the inherited funds are later mixed into joint accounts, used to pay down a shared mortgage, or invested in a jointly-owned asset, the original ring-fence can erode. Keeping inherited money in a separate account and maintaining records of its origin strengthens the clause considerably.
For a broader look at how inheritance interacts with Australian property law, the existing article on whether a prenup can protect inheritance in Australia covers the legal landscape in detail.
Superannuation accumulated during the relationship
Super is treated separately from other assets under the Family Law Act, but it can still be the subject of a BFA. A couple can agree in advance that super contributions made during the relationship will not be split if they separate. Courts can still make superannuation splitting orders even where a BFA exists, so this area requires precise drafting. Rockwell Family Law Services advises clients to address super explicitly and separately from other future assets rather than relying on a general future-property clause to capture it.
Business growth: a frequently overlooked issue
If one partner owns a business at the time of signing, the BFA typically addresses its current value. What it often fails to address clearly is what happens to the increase in value over the following years. Australian courts treat business growth as a potential joint contribution, particularly if the non-owner partner provided domestic support that freed the other to build the business.
A BFA that excludes only the original value of the business at signing, without also addressing future growth, may leave the owner exposed. The growth in value from $500,000 to $2 million over a decade could be partially treated as a shared asset if the agreement is silent on the point. Addressing growth explicitly, and attributing it to the right party, is one of the more technically demanding parts of BFA drafting.
What a future-asset clause cannot do
There are real limits. A BFA cannot override a court's jurisdiction to make orders about the maintenance of a party who would otherwise be left in genuine financial hardship. If excluding all future assets would leave one partner destitute, a court can set the agreement aside or decline to apply it in full.
A future-asset clause also cannot anticipate every possible scenario. The courts expect agreements to be fair at the time they are made and at the time they are applied. An agreement drafted in 2026 that becomes wildly unfair by 2038 due to circumstances the parties couldn't reasonably have foreseen faces a real risk of being set aside under section 90K of the Family Law Act.
Why independent legal advice matters even more here
Every party to a BFA must receive independent legal advice from a qualified Australian lawyer before signing. That requirement applies to all BFAs, but it carries extra weight when future assets are involved. A lawyer reviewing a future-asset clause needs to explain not just what the clause says today, but what it means if the asset is never acquired, if it is acquired and then sold, or if it increases dramatically in value. Rockwell Family Law Services provides that advice to each client separately, ensuring the certificate of independent legal advice reflects a genuine understanding of the clause's practical reach.
Without that step, the whole agreement is at risk. Not just the future-asset provisions. The entire document can fall if the independent advice requirement isn't properly satisfied.
Future-asset clauses in a prenup are legally possible in Australia, but they demand more care than standard asset-protection provisions. Get the drafting right from the start, and the agreement can genuinely protect wealth you haven't yet built.