A student visa application is mostly documents, and most of them do not need a notary at all. Knowing which do saves money and, more importantly, avoids the delay of being asked for something you did not bring.
Note the direction of travel matters. This page is about documents issued overseas and used in Australia, and documents issued in Australia for an overseas purpose connected to study. The requirements differ.
For documents submitted to the Department of Home Affairs, certified copies are generally acceptable, and the list of people who may certify is broad — a Justice of the Peace, a pharmacist, an accountant and others, depending on the document.
You typically do not need a notary for:
Paying a notary for these buys nothing.
Documents issued overseas, being used here. A degree from an overseas university, a birth certificate from another country, a police clearance from a previous country of residence. These usually need to be notarised and authenticated in the issuing country, not in Australia — an Australian notary cannot vouch for a foreign registry's document.
Documents issued in Australia, being used overseas. Where a home-country authority needs proof of your Australian enrolment, a notarised copy of your Confirmation of Enrolment or a letter from the institution, with an apostille. Common for scholarship bodies, sponsoring ministries and currency-control approvals.
Financial sponsorship from overseas. A sponsor's affidavit of support, bank confirmation or property valuation from another country typically needs notarisation and legalisation in that country.
Consent for a minor. Where a student under 18 travels or studies abroad, parental or guardian consent is usually notarised, and frequently needs an apostille.
Documents not in English must be accompanied by an English translation.
For Australian immigration purposes, translations done in Australia should be by a NAATI-credentialled translator. Translations done overseas should carry the translator's full name, address and credentials.
A notary does not translate. What a notary can do is attest the translator's declaration and bind the translation to the original — which is what many overseas authorities want, and what some Australian institutions prefer for high-value documents.
For a document issued overseas:
For a document issued in Australia for overseas use:
Getting step 4's position wrong is the usual cause of paying twice.
Student visa applications run to intake deadlines, and the document chain is the part that cannot be compressed:
Work backwards from the intake date, not forwards from today.
The Department asked for a "certified copy". Does that mean notarised? Usually not. For Home Affairs, certification by an authorised person is normally enough. If a foreign authority uses the phrase, it usually does mean notarised — ask which they mean.
My documents were notarised in my home country. Do they need anything here? Generally no, provided they were properly authenticated there. An Australian notary cannot add anything useful to a foreign document's chain.
Can I notarise a document I have only as a PDF? No. A notary must sight the original. A PDF from the issuing body can sometimes be verified directly by the receiving authority instead — worth asking, as it may remove the need entirely.