Preparing a Family Court Affidavit

This fact sheet explains what an affidavit is and when you need to file one. It also gives basic information about what you can and cannot include in an affidavit.

What is an affidavit?

An affidavit is a written statement where you provide evidence (facts of the case) to the Family Court of Western Australia about your matter.  Any affidavit you file in the Family Court of Western Australia to support your case must be served on all parties, including the independent children’s lawyer (if appointed).

When do I file an affidavit?

You need to file an affidavit with an interim application, response or when directed by the Family Court.  Perth Family Lawyers can provide you with a blank affidavit prescribed by the Family Court of Western Australia which can be used by applicants and respondents.  

You can also obtain a copy of prescribed forms and affidavits online from 

Can I prepare my own affidavit?

Although you can prepare your own affidavit, it is often not easy.  If you need help preparing your affidavit you should contact our office to arrange an appointment with one of our solicitors. 

How do I structure an affidavit?

In the Family Court the affidavit should be typed.  The content of an affidavit should be divided into paragraphs that are numbered.  It is a good idea to divide an affidavit into sections under separate headings; for example, the heading might be ‘Arrangements for the children after separation’ or ‘Property accrued during the marriage/de facto relationship’.  Each paragraph should, if possible, cover one topic or subject matter.

Affidavits by other witnesses

If you are relying on evidence from a third party to support your case, such as a family member, friend or professional, you will need to file a separate affidavit on their behalf.  You should only file an affidavit by a witness if the evidence is relevant to your case.

Unless a court orders otherwise, a child (under the age of 18 years) should not prepare an affidavit to support your case.

What can I say in an affidavit?

An affidavit is a statement of facts.  Therefore, you should include all the facts that are relevant in your case.  Importantly, your affidavit should support the orders you have asked the Court to make in your application or response.  The length of your affidavit will depend on the complexity of your case.  Your affidavit does not need to be lengthy provided you include all the facts that you are relying on as evidence.  Leave out things that are not relevant to the issue that the Court has to decide.

Can I give my evidence in court instead?

There is limited opportunity to give a personal account of your evidence in Court verbally.  Generally evidence is provided by affidavit.  This allows cases to run more quickly and efficiently as all parties know what evidence is before the Court.

What should not be included in an affidavit?

Generally, an affidavit should not set out the opinion of the person making the affidavit; that is, it must be based on facts not your beliefs or views.  The exception is where the person is giving evidence as an expert; for instance, a psychologist or licensed valuer.

Where possible you should avoid referring to facts that are based on information received from others (known as hearsay evidence).  There are, however, a number of exceptions to the hearsay rule.  If you need to rely on hearsay evidence in your affidavit, get legal advice from your solicitor at Perth Family Lawyers to see whether it would be admissible in court.

You should not refer to anything said or documents produced in connection with an attempt to negotiate a settlement of your dispute, as these are not admissible as evidence in Court. There are some exceptions and if you want to refer to these communications you should read section 131 of the Evidence Act 1995 (Cth) and obtain advice from Perth Family Lawyers.  If you are unsure about what can and cannot be included in your affidavit, you should contact our office to arrange an appointment to discuss this with one of our solicitors. 

Attaching documents

In the Family Court of Western Australia a document that is to be used in conjunction with an affidavit and tendered in evidence in a court proceeding, must be identified in the affidavit but must not be attached to (or annexed to) the affidavit, or filed as an exhibit to the affidavit.  There may be exceptions where court orders or the Rules provide otherwise (for example Family Law Rule 15.62 in relation to expert reports).

The document/s referred to in the affidavit must be served with the affidavit on the other party/ies after filing.  The document/s must then be tendered in evidence at the court event when the relevant affidavit is relied upon or as required. See Family Law Rule 15.08.

Signing an affidavit

The person making an affidavit (the deponent) must sign the bottom of each page in the presence of an authorised person, such as a lawyer or Justice of the Peace (if you are overseas a Notary Public or Australian Diplomatic/Consulate Officer can witness the signature).  On the last page of the affidavit the following details must be set out (known as a jurat):

  • the full name of the person making the affidavit, and their signature
  • whether the affidavit is sworn or affirmed
  • the day and place the person signs the affidavit, and
  • the full name and occupation of the authorised person, and their signature.

If any alterations (such as corrections, cross-outs or additions) are made to the affidavit, the person making the affidavit and the witness must initial each alteration.