Statutory Declaration vs Affidavit: the Difference in Australia

A statutory declaration is a formal statement made under legislation for administrative purposes, such as a government department, bank or insurer. An affidavit is sworn or affirmed evidence for a court or tribunal. Both are signed before an authorised witness and both carry penalties for lying. If no legal proceeding exists, you almost certainly want a statutory declaration.

Key takeaways

• A statutory declaration is declared; an affidavit is sworn on oath or affirmed. The affidavit forms part of a proceeding, and its maker can be cross-examined on it.
• Statutory declarations come in a Commonwealth version and a version for each state and territory. Using the wrong one is the most common error.
• An affidavit's form and who may take it are set by the court's rules. Check them, or ask the court or your lawyer.
• For use overseas, either document usually needs a notary and then DFAT. Many foreign authorities call any sworn statement an affidavit.
• The witness confirms who signed, not whether the contents are true. Drafting is your responsibility.

The practical differences

Both are written statements of fact that you sign in front of an authorised witness. The difference is where they are used and what happens to them afterwards. A statutory declaration is read by an organisation that wants a formal assurance, such as the Department of Home Affairs, an insurer processing a claim or an employer confirming a name change. An affidavit is filed in a proceeding and becomes evidence the other side can test.

Point	Statutory declaration	Affidavit
Used for	Administrative and official purposes	Court and tribunal proceedings
How it is made	Declared	Sworn on oath, or affirmed
Who witnesses	JP, notary, and a long list of authorised occupations	Those the court's rules allow, commonly lawyers, JPs and notaries
Attachments called	Annexures	Exhibits or annexures, depending on the rules
Form	Prescribed by the relevant Act	Prescribed by the court's rules
Can you be questioned on it?	Not usually	Yes, by cross-examination
Penalty for lying	A criminal offence	A criminal offence, and possibly contempt

Commonwealth or state?

Statutory declarations come in versions, and using the wrong one is the most common error. A Commonwealth statutory declaration is made under federal legislation and is the right form for federal matters, such as immigration, Centrelink and the ATO. The current Commonwealth form and its list of witnesses are on the Attorney-General's Department site, along with the digital option through myGov where the receiver accepts it.

Each state and territory has its own statutory declaration under its own Act, for state matters such as land titles, state revenue and state licensing. Which occupations may witness which form is set by the relevant Act, and the lists are not identical. A witness authorised for a state declaration is not automatically authorised for a Commonwealth one. Check the form's own instructions; they are printed on it for exactly this reason. In Queensland, a Commissioner for Declarations is among the witnesses. Our guide to who can witness a statutory declaration sets out the shape of each list.

Who can take an affidavit

For an affidavit, the court's rules decide who may take it and what it must look like: the heading, the numbering, how exhibits are marked, and the wording of the jurat, which is the block at the end recording where, when and before whom it was sworn. Those rules differ between courts and between states. Lawyers, JPs and notaries are commonly allowed, but check with the court registry or your lawyer before you book anyone.

An oath is sworn on a religious text; an affirmation is a solemn promise without one. They have the same legal effect, and you can choose either. Tell the witness which you prefer before you begin.

When it has to go overseas

Here the answer changes. A foreign authority does not care whether your witness was a pharmacist authorised under a state Act. It needs a signature it can verify, which in practice means a notary public, followed by an apostille or legalisation from the Department of Foreign Affairs and Trade (DFAT). A JP's signature cannot be apostilled.

So a declaration for the Department of Home Affairs can be witnessed by a JP, and the same declaration for a foreign ministry needs a notary. The text may be identical; the witnessing requirement is not.

There is a second twist. Outside Australia, "affidavit" often means any sworn written statement, not only court evidence. A foreign registry asking for a single-status affidavit, an affidavit of support or an affidavit of identity usually wants a statement sworn before a notary, on its wording, with nothing filed in any court. Ask the receiver for its form in writing; do not assume an Australian statutory declaration will be accepted in its place. Our article on how to notarise an affidavit covers the appointment, and the legal declarations page describes the notarial step.

After the notary, DFAT adds an apostille for Hague Convention countries or an authentication for others, which then go to the embassy. Check the destination on the HCCH status table on the day, because membership changes. Our apostille and authentication page covers that step.

Getting the content right

The witnessing is the easy part. Most problems are in the drafting, and the witness does not check it: a JP or notary confirms who signed, not whether the statements are true or well expressed.

1. State facts, not conclusions. "I paid the deposit on 3 March 2026" is a fact. "The agreement was valid" is a legal conclusion and does not belong in your evidence.
2. Only what you know personally. If you are repeating what someone told you, say so explicitly and say who told you.
3. Number the paragraphs. Required for affidavits under most court rules, and useful in a declaration.
4. Refer to attachments properly. Each annexure or exhibit must be identified and usually signed or initialled by the witness as well.
5. Do not sign before you get there. The witness must see you sign. A pre-signed document must be made again.

For an affidavit in active proceedings, see a solicitor about the content. It becomes evidence, the other side will read it closely, and a careless paragraph can be used against you. For a simple statutory declaration, such as a change of address or a lost document, you can usually write it yourself.

Which one for common situations

The receiver's instructions always win, but these are the usual answers:

• An insurance claim: a statutory declaration, on the form the insurer names.
• Confirming a change of name to an employer or bank: a statutory declaration, usually on the form for your state or the Commonwealth, whichever they ask for.
• Supporting a partner visa application: the supporting statements Home Affairs asks friends and family for are declarations, not affidavits, and a witness on the Commonwealth list will do.
• Evidence in a family law, tenancy or building dispute: an affidavit on the court's or tribunal's form, often prepared with a lawyer.
• Proving you are free to marry overseas: whatever the foreign registry names, often a single-status affidavit or declaration sworn before a notary.
• An inheritance or property matter abroad: usually a sworn statement on the foreign lawyer's wording, before a notary, then DFAT.

When the instructions just say "a sworn statement", ask which of the two they mean. The question costs nothing; making the wrong document costs a second appointment.

Corrections

If you need to change something after printing, do not use correction fluid. Strike through, write the correction, and have both you and the witness initial it. An unexplained alteration on a sworn or declared document is treated seriously. For an affidavit, check the court's rules, because some require a fresh document rather than an initialled amendment. For a document going overseas, a clean reprint is usually safer, since a foreign official may question any alteration.

If you are overseas

An Australian consular officer can usually witness a Commonwealth statutory declaration for use in Australia, and some consular posts also take affidavits. Check the post's current services on Smartraveller. Alternatively, a local notary can witness the document, followed by that country's authentication. Confirm with the Australian body receiving it which route it accepts before you go.

Here is an illustration, not a real case

A woman in Perth is in a dispute with a builder and is also claiming on her insurance for a stolen laptop. For the insurer, she makes a statutory declaration on the form it names, before her pharmacist, who is on that form's witness list. For the building dispute, her lawyer prepares an affidavit on the tribunal's form, and she swears it before a JP the tribunal's rules allow, with the contract and invoices marked as exhibits. A month later a relative's estate abroad asks her for an "affidavit of heirship"; that one goes to a notary, on the foreign lawyer's wording, and then to DFAT.

In short

A statutory declaration is for organisations, on the Commonwealth or state form, before a witness on that form's list. An affidavit is court evidence, on the court's form, before a witness its rules allow. For overseas use, either needs a notary and DFAT, and the foreign receiver's own form usually decides which one it is.

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