12 Month Separation Rule Divorce: What Counts and How to Prove It
Before you can apply for a divorce in Australia, you and your spouse need to have been separated for a continuous period of at least 12 months. This is not a formality. It is a legal requirement under section 48 of the Family Law Act 1975 (Cth), and the Federal Circuit and Family Court of Australia (FCFCoA) will not make a divorce order unless it is satisfied that this period has genuinely been met. For most couples, working out whether they meet the 12 month separation rule for divorce is straightforward. For others, particularly those who kept living in the same home after the relationship ended or had a very short period of reconciliation, the answer is less obvious, and getting it wrong can delay an application or see it rejected at the hearing.
This article explains the 12 month separation rule for divorce applicants in Australia, how the separation date is identified, what happens if you and your spouse briefly got back together during that time, and what you may need to prove if you continued living under the same roof. It also touches on why the separation date matters beyond the divorce itself.
The 12 Month Separation Rule Divorce Applicants Must Meet
Section 48 of the Family Law Act 1975 (Cth) sets out the only ground for divorce in Australia: that the marriage has broken down irretrievably. The court treats this as established where the parties have separated and then lived separately and apart for a continuous period of at least 12 months immediately before the divorce application is filed. This is the 12 month separation rule divorce applications must satisfy, and the Act also makes clear that a divorce order will not be made if the court is satisfied there is a reasonable likelihood that the couple will resume living together. In practice, this means the separation needs to be real and, as far as either person can say, final, not a temporary cooling off period.
In virtually all cases there is no way to shorten this period. If you separated eleven months ago, the application generally needs to wait, regardless of how clear-cut the breakdown of the relationship is.
How the Separation Date Is Identified
The separation date is the date on which one or both of you communicated, in words or through conduct, that the relationship was over. It does not need to be agreed by both people, and it does not need to be marked by one person physically moving out. What matters is that from that point on, the way you lived together changed, even if only one of you initiated it. This can be one of the more contested aspects of a matter where the date is not clear-cut, so it is worth thinking carefully about when your circumstances actually changed.
Because the whole 12 month calculation depends on this date, it is worth being able to identify it clearly and, ideally, to have some contemporaneous evidence of it, such as a text message, an email, or a conversation that a friend or family member is aware of. This becomes particularly important where the separation date is disputed or where you continued sharing a home.
Separation Under One Roof
Separation under one roof, sometimes called separated but living together, is when a couple's relationship has ended but they continue living in the same home, often for financial, practical or parenting reasons while they sort out their next steps. This is common, and the FCFCoA has an established process for assessing it, but the outcome depends on the evidence you provide, not simply on the fact that you say it happened.
If any part of your 12 month period was spent living in the same home, the FCFCoA requires an affidavit addressing the reality of the separation. This typically means explaining:
changes to sleeping arrangements
whether you continued sharing meals or household duties
whether finances were separated
what you told family, friends or government agencies like Centrelink about your situation, and
what arrangements were made for any children under 18 during that time
The court generally expects at least one independent corroborating affidavit, such as from a family member or friend who can speak to the separation from their own observation, particularly for a sole application. Exact requirements can vary slightly by registry, so it is worth confirming current practice before you file. Because this is sworn evidence, the date and events you describe need to be accurate. The court is testing whether separation genuinely occurred, not just whether the paperwork says it did.
The court is looking for evidence of a genuine change in the relationship, not simply a change of address. Continuing to live under the same roof does not disqualify a period from counting towards your 12 months, but it does mean the burden of demonstrating that the relationship had actually ended sits more heavily on the evidence you provide.
Reconciliation Attempts and How They Affect the Separation Period
It is common for separated couples to attempt a reconciliation before deciding the relationship is genuinely over, and the law allows for this without automatically restarting the 12 month clock. Under section 50 of the Family Law Act 1975 (Cth), if you resume living together once, for a period or periods totaling no more than three months, and then separate again, the time before and after that reconciliation attempt can generally be added together to make up the 12 months. The period spent back together, however, does not itself count toward the 12 months.
If the reconciliation lasts longer than three months in total, or if there is more than one resumption of cohabitation, the calculation becomes more complicated and the 12 month period may need to start again from the date of the most recent separation. Because this can materially affect when you are eligible to apply, it is worth getting advice before assuming a brief reconciliation has not affected your timeline.
Evidence That Can Help Establish Your Separation Date
Even where a couple never lived under the same roof after separating, it is sensible to be able to point to something that marks the separation date, particularly if the date is at all likely to be disputed. Useful evidence can include text messages or emails discussing the end of the relationship, changes to living arrangements, updates to relationship status with Centrelink, Services Australia or the Australian Taxation Office, evidence of separated finances, or a statement from someone who was told about the separation at the time. None of this needs to be elaborate, but having something beyond your own recollection can make the divorce application, and any later property discussions, considerably more straightforward.
Why the Separation Date Also Matters After Divorce
The separation date is not just relevant to when you can apply for divorce. There is no time limit on starting property settlement proceedings while you remain married. That changes once a divorce order takes effect: section 44(3) of the Family Law Act 1975 (Cth) requires that any application for property settlement or spousal maintenance be filed within 12 months of that date, unless the court grants leave to bring the application later, which it will generally only do where there would be hardship to a party or a child, or where both parties consent. This is a separate 12 month period from the separation requirement, and it is easy to lose track of it in the process of finalising a divorce. If property or maintenance issues remain unresolved when you apply for divorce, it is worth understanding and noting this time limit before, not after, the divorce order takes effect. Our property settlement process article explains how that process generally works.
Getting Your Situation Right Before You Apply
The 12 month separation rule for divorce is one of the more procedural aspects of family law, but getting the separation date and any period under one roof properly documented can be the difference between an application that proceeds smoothly and one that is delayed while the court asks for more information. If you are unsure whether you meet the requirement, whether a period of reconciliation has affected your timeline, or how to approach an affidavit for separation under one roof, it is worth getting advice before you file. Our guide to applying for divorce in Australia covers the broader application process, and our divorce services can support you through it. A Strategy Session is a practical starting point if you want clarity on your specific circumstances before applying. You can also find answers to common questions on our FAQ page.
