Does a NAATI translation need extra notarisation?
For use inside Australia, generally no: the practitioner's stamp already certifies the translation. Extra notarisation matters when the document will be used in a country that imposes its own legalisation chain.
In-depth Answer
The confusion comes from comparing two different systems.
Australia accepts the credentialled practitioner's declaration directly, so no second layer of certification is required.
Many other countries instead run a chain in which a signature is witnessed and then authenticated by government bodies in sequence before the document is accepted.
The question to settle first is therefore not what to add, but where the document will be used and by whom.
If the destination is an Australian body, the practitioner's stamp is enough.
If it is an authority in a third country, check that country's rules on witnessing and successive authentication — and ask the receiving body in writing, which saves redoing the whole set.
Related questions
Documents most Australia visa applicants translate into English
Pick the document and the hub nearest you — MoJ-sworn + MFA-stamped here, then layered with the NAATI seal for use in Australia.
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