Statutory Declaration vs Affidavit: the Difference in Australia

A statutory declaration is a formal statement made under a particular statutory scheme. An affidavit is a written statement sworn or affirmed, commonly for a court or tribunal. The requesting body, governing legislation and court rules determine the right document, form, witness and signing method—so use the instructions supplied rather than choosing by title alone.

Key takeaways

• A statutory declaration is made under a statutory scheme; an affidavit is sworn or affirmed and is commonly filed as evidence. Its procedural effect depends on the proceeding and rules.
• 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 overseas use, ask the recipient whether it needs a local form, notarisation, DFAT legalisation or none of those additional steps.
• The witness performs the duties required by the applicable scheme or rules. The maker remains responsible for the statement.

What are 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
Common use	A process requiring a declaration under legislation	Evidence in a court or tribunal proceeding
How it is made	Declared	Sworn on oath, or affirmed
Who witnesses	A person approved under that declaration scheme, unless using an approved witness-free digital route	A person and method allowed by the applicable court or tribunal rules
Attachments called	Annexures	Exhibits or annexures, depending on the rules
Form	Prescribed by the relevant Act	Prescribed by the court's rules
Can it be tested?	Depends on the process in which it is used	May be tested in the proceeding, including by cross-examination where ordered or permitted
False statement	Can attract penalties under the applicable law	Can have criminal and procedural consequences

Which statutory declaration scheme applies?

Statutory declarations come under different schemes. Use the form or method the requesting organisation accepts. A Commonwealth statutory declaration is made under federal legislation, but it is not limited to government processes: a person or organisation may request one for a lawful reason. The current options include in-person witnessing, remote witnessing and an approved digital route through myGov. See the Attorney-General's Department guide to Commonwealth statutory declarations.

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, numbering, identification steps, how exhibits are marked, and the wording of the jurat recording where, when and before whom it was sworn. Those rules differ between courts and states. Lawyers, JPs and notaries are commonly allowed, but check with the court registry or your lawyer before booking.

An affidavit may be sworn by oath or made by affirmation according to the applicable procedure. An affirmation does not require a religious oath. Check the form and tell the authorised witness which method you will use before signing.

What changes when the document goes overseas?

Ask the foreign receiving authority for written instructions. It may want its own affidavit wording, an Australian statutory declaration, a notarial certificate, DFAT legalisation or only the signed document. Overseas use alone does not automatically require every step.

If DFAT legalisation of a private statement is required, the document generally needs an appropriate Australian notarial act first. A Justice of the Peace's signature is not a notarial act DFAT can legalise. The recipient still decides whether a notarised document, apostille, authentication or further consular step is sufficient.

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.

Where legalisation is required, ask whether the recipient wants an apostille or authentication and whether any embassy or consular step follows. Check the current HCCH status table, but do not use Convention membership as a substitute for recipient instructions. DFAT explains that many overseas authorities accept documents without legalisation; see its current legalisation guidance and our apostille and authentication service.

How should you prepare the content?

The maker is responsible for the statement, while the witness performs the duties required by the form and rules. Do not assume the witness is reviewing legal sufficiency. For an affidavit, the relevant court's instructions and legal advice are especially important.

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. Follow the required structure. Use numbered paragraphs, headings and page formatting where the applicable rules require them.
4. Refer to attachments properly. Label annexures or exhibits and complete any witness certificates required by the form or rules.
5. Follow the approved signing method. This may be in person, remotely or through an approved digital declaration route. Do not pre-sign when observation is required.

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 document may fit common situations?

The receiver's instructions and governing rules control, but these examples illustrate common patterns:

• 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: use the form and evidence instructions supplied by Home Affairs for that application; do not substitute a generic declaration.
• 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: obtain the foreign lawyer's wording and written execution and legalisation instructions before signing.

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.

How should corrections be made?

Use the correction procedure for the applicable form and rules. For a witnessed Commonwealth declaration, changes after witnessing must be made in front of the same witness and initialled by both; extensive or changed facts may require a new declaration. Affidavit requirements depend on the court or tribunal. Avoid correction fluid and ask the receiver whether a clean replacement is required.

What if you are overseas?

A Commonwealth statutory declaration can be made overseas using an approved in-person witness, an approved remote witness in Australia or the approved myGov digital route. Consular posts may provide witnessing and oath services subject to availability and fees. An affidavit or state declaration follows its own rules. Confirm the receiving body's accepted method before arranging a local notary or consular appointment. See DFAT's notarial services guidance.

Permission to witness a Commonwealth statutory declaration remotely does not automatically permit every notarial act by video. The notary must confirm whether the particular act is available under the relevant jurisdiction and professional rules, and the receiving authority must accept the result.

What does a practical example look like?

A woman in Perth is in a dispute with a builder and is also claiming on insurance for a stolen laptop. She uses the declaration form and witness the insurer specifies. Her lawyer prepares an affidavit under the tribunal's rules for the building dispute. Later, a foreign estate asks for an “affidavit of heirship.” She obtains its wording and confirms whether notarisation and DFAT legalisation are required before signing.

How much do declarations and affidavits cost?

A Justice of the Peace cannot charge to witness a Commonwealth statutory declaration, although other approved witnesses are not prohibited by the federal Act from charging. The myGov digital Commonwealth declaration currently avoids a witness. Affidavit preparation, legal advice, notarisation, interpreters, DFAT legalisation and consular services can each involve separate fees.

Ask for a written quote based on the exact form, number of signers and exhibits, signing method and deadline. Do not pay for notarial or legalisation stages merely because the document will travel overseas; first confirm the receiving authority's route.

What is the practical conclusion?

Use the document, form and execution method requested under the applicable scheme or court rules. A statutory declaration and affidavit can contain similar facts, but their legal basis and procedure differ. For overseas use, obtain written instructions before adding a notary, DFAT or consular step.

Related questions

• When does a statutory declaration need a notary?
• How much does an affidavit cost in Australia?
• Is a statutory declaration free?
• Can I make a statutory declaration online?
• How do I get a certified copy of an affidavit?

Send us the document requirements, including who requested it, the governing scheme or court, destination country, signer location, number of exhibits and deadline.