Statutory Declaration vs Affidavit: Which Do You Need?
Table of contents
Both are written statements of fact that you sign in front of an authorised witness, and both carry criminal penalties if you lie. The difference is where they are used and what happens to them afterwards.
A statutory declaration is a formal statement made under legislation, used for administrative purposes — government departments, insurers, banks, employers, foreign authorities.
An affidavit is sworn or affirmed evidence for a court or tribunal. It forms part of a proceeding, and the person who made it can be cross-examined on it.
If nobody has commenced legal proceedings, you almost certainly want a statutory declaration.
The practical differences
| Statutory declaration | Affidavit | |
|---|---|---|
| Used for | Administrative and official purposes | Court and tribunal proceedings |
| Sworn or affirmed | Declared | Sworn on oath, or affirmed |
| Who witnesses | JP, notary, and a long list of authorised occupations | Usually a lawyer, JP or notary, per court rules |
| Attachments called | Annexures | Exhibits or annexures, per the rules |
| Form | Prescribed by the relevant Act | Prescribed by the court's rules |
| Penalty for falsehood | Criminal offence | Criminal offence, and 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 departments — immigration, Centrelink, the ATO.
Each state and territory has its own statutory declaration under its own Act, for state matters — land titles, state revenue, 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.
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.
So: a declaration for the Department of Home Affairs can be witnessed by a JP. The same declaration for a foreign ministry needs a notary. The text may be identical; the witnessing requirement is not.
Getting the content right
The witnessing is the easy part. Most problems are in the drafting.
- 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.
- Only what you know personally. If you are repeating what someone told you, say so explicitly.
- Number the paragraphs. Required for affidavits under most court rules, and useful in a declaration.
- Refer to attachments properly. Each annexure or exhibit must be identified and usually signed or initialled by the witness as well.
- Do not sign before you get there. The witness must see you sign. A pre-signed document must be re-executed.
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 document is treated seriously.
For an affidavit, check the court's rules — some require a fresh document rather than an initialled amendment.
Frequently asked questions
Can I write it myself? Yes, for a statutory declaration. For an affidavit in active proceedings, get legal advice on the content — it becomes evidence and can be used against you.
What if I am overseas? An Australian consular officer can usually witness a Commonwealth statutory declaration. Alternatively a local notary, followed by authentication. Confirm with the receiving body first.
Can a family member witness it? Legally sometimes, practically never advisable. A witness with an interest in the matter invites challenge. Use an independent one.
Is an unsworn statement the same thing? No. A letter or email stating the same facts carries none of the formal weight and will usually be rejected where a declaration was requested.
