Affidavit for Separation Under One Roof in Australia

Australian family law recognises that you can be legally separated while still living in the same house. Housing costs, children's stability, or simply not having anywhere else to go — the reasons vary, but the legal principle is clear under the Family Law Act 1975.

The catch: you must prove it. And the proof comes through sworn affidavits that meet specific evidentiary standards the court actually checks.

Why the Court Needs an Affidavit

When both spouses live at the same address, the court cannot assume from the filing alone that a genuine separation occurred. The Affidavit — Separation Under One Roof is a mandatory document that provides the detailed evidence the registrar needs to be satisfied that the marriage has irretrievably broken down despite shared accommodation.

Without this affidavit, your application will be adjourned or rejected.

Who Must File Affidavits

The requirements depend on your application type:

Sole application: You file your own affidavit plus a supporting affidavit from an independent third party — someone who has personally observed your separate lives. This could be a neighbour, family friend, relative, or health professional.

Joint application: Both spouses file separate affidavits, or one spouse files an affidavit plus an independent third party provides a supporting one.

The third-party witness cannot be your lawyer or a person with a financial interest in the outcome.

What the Affidavit Must Cover

The court examines five specific areas of evidence. A vague or incomplete affidavit on any of these points will trigger an adjournment.

1. Domestic Living Arrangements

Detail the practical changes in how you live: separate bedrooms, cessation of sexual relations, and a clear division of household tasks. If one person stopped cooking for the other, or you began doing your own laundry separately, state it plainly.

2. Financial Separation

Evidence of separating your financial lives: closing joint bank accounts, opening individual accounts, dividing utility payments, changing beneficiaries on superannuation or insurance policies, and splitting household expenses.

3. Social and Public Presentation

How you present yourselves to the outside world matters. Do you attend family gatherings, school events, and social occasions separately? Have you told family and friends about the separation? The affidavit should describe specific instances.

4. Government and Administrative Notifications

Written evidence that you notified government agencies of your single status — Services Australia (Centrelink or Child Support), the Australian Taxation Office, or Medicare. Changing your tax return status or notifying Centrelink of a relationship change is strong documentary evidence.

5. Why You Continued Living Together

Explain the practical reasons: financial necessity, children's schooling stability, inability to find alternative housing, or health considerations. Include your future intentions — whether one party plans to move out once circumstances allow.

Common Mistakes That Cause Rejections

Being too vague: Writing "we lived separate lives" without specific examples. The registrar needs concrete details — dates, changes in routine, financial transactions.

Missing the third-party affidavit: For sole applications, your own affidavit alone is not sufficient. The independent witness must corroborate your account with their own observations.

Contradicting your other documents: If your application states a separation date but your affidavit describes shared activities after that date, the registrar will flag the inconsistency.

Not explaining the shared arrangement: The court expects you to address why you stayed under the same roof. Leaving this out invites questions that delay your hearing.

Getting the Affidavit Witnessed

Every affidavit must be signed in the physical presence of a Justice of the Peace or practising lawyer. In the ACT, free JP services are available at government shopfronts, public libraries, and community centres across Canberra. JPs must write their registered JP number beneath their signature.

The ACT Divorce Filing Process Guide includes a structured evidence inventory worksheet that walks you through each of the five evidence categories, helping you compile the specific details your affidavit needs before you sit down to draft it.

See more Australian Capital Territory guides →