BFA vs Pre-nup: Are They the Same Thing in Australia?

Short answer: Yes. In Australia, a "pre-nup" is just the everyday name for a Binding Financial Agreement (BFA) made before marriage. They're the same legal document: one term is colloquial, the other is what the legislation actually calls it.

But there's some nuance worth understanding, especially around timing and terminology.

The Legal Term: Binding Financial Agreement

In Australia, the formal name for any agreement between couples about property, finances, and spousal maintenance is a Binding Financial Agreement, governed by the Family Law Act 1975.

There's no separate legal instrument called a "pre-nup" in Australian law. If you walked into the Federal Circuit and Family Court asking to enforce your "pre-nup", they'd file it under BFAs.

The Everyday Term: Pre-nup

"Pre-nup" is short for "pre-nuptial agreement", a term borrowed largely from American pop culture and film. It refers specifically to an agreement signed before a marriage.

In Australia, that scenario is covered by section 90B of the Family Law Act, which deals with BFAs made "before marriage". So when an Aussie says "pre-nup", what they're describing is a s. 90B Binding Financial Agreement.

Where the Two Terms Differ

Here's the nuance: "pre-nup" only describes BFAs made before marriage. BFAs themselves are much broader and can be made at three different stages:

Before marriage or cohabitation (s. 90B): what people commonly call a pre-nup
During the relationship (s. 90C): sometimes called a "post-nup" or "mid-nup"
After separation or divorce (s. 90D): used to formalise a property settlement

So every pre-nup is a BFA, but not every BFA is a pre-nup. If you sign your agreement five years into your marriage, technically it's not a "pre-nup", it's a s. 90C BFA. Most people still call it a pre-nup informally, but the legal classification is different.

De Facto Couples Are Covered Too

The terms "pre-nup" and even "pre-nuptial" assume marriage. But BFAs aren't just for married couples: de facto couples (including same-sex couples) have their own equivalent sections under Part VIIIAB of the Family Law Act (ss. 90UB, 90UC, 90UD).

So if you're in a de facto relationship and sign an agreement before moving in together, calling it a "pre-nup" isn't technically accurate (there's no nuptial), but functionally it does the same job as a pre-nup for married couples.

Are the Requirements the Same?

Yes, whether you call it a pre-nup or a BFA, the legal requirements are identical:

Written agreement signed by both parties
Independent legal advice for each party, from separate lawyers
Legal advice certificates signed by each lawyer
Full financial disclosure from both parties
Voluntary: no duress, fraud, or unconscionable conduct

If any of these are missing, the agreement can be set aside under s. 90K, regardless of what you call it.

Why the Confusion Exists

A few reasons people use "pre-nup" interchangeably with BFA:

American media: Hollywood films and TV shows have made "pre-nup" the default term for any agreement between couples, even though the US system is quite different.
Familiarity: "Pre-nup" is shorter and instantly understood, whereas "Binding Financial Agreement" sounds more clinical.
Marketing: Many Australian law firms use "pre-nup" in their marketing to make the service feel more approachable.

So Which Term Should You Use?

In casual conversation, "pre-nup" is perfectly fine. Everyone will know what you mean.

In any legal document, court process, or formal context, the correct term is Binding Financial Agreement. Your lawyer will draft it as a BFA, the certificates will refer to it as a BFA, and the Family Law Act will treat it as a BFA.

The Bottom Line

A pre-nup and a Binding Financial Agreement are the same thing in Australia: the only difference is the name and, technically, the timing. "Pre-nup" describes a BFA signed before marriage. A BFA covers any agreement made before, during, or after the relationship.

Whatever you call it, the legal protection is identical. What matters is that it's drafted properly, both parties get independent legal advice, and it complies with the Family Law Act.

Get those things right, and the name on the front page barely matters.