This question is asked constantly and answered badly. The short answer is that a notarial act does not expire — but that is not the answer most people actually need, because documents are rejected for being "too old" all the time.
The confusion comes from conflating three separate clocks.
The notarial act. A notary's certificate records something that happened on a date: an original was sighted, a signature was made, an oath was taken. That event does not become untrue with time. There is no built-in expiry, and the notary's register preserves the record permanently, which is why a notarised document can still be verified years later.
The underlying document. This one genuinely can expire. A passport expires. A police check describes a search on a date. A company extract reflects the register on the day it was pulled. A certificate of no impediment to marriage is, by its nature, a statement about a moment. Notarising any of these does not freeze them.
The receiving authority's own rule. This is almost always the real answer. Foreign registries, courts, universities and immigration departments routinely require that documents be issued or notarised within a recent window — three months and six months are the ones you hear most, but the rule belongs to the receiving body and varies widely.
When someone says a notarised document has "expired", they nearly always mean the third thing.
It is not arbitrary. A recency rule is a cheap proxy for currency of information. An authority accepting a police check from four years ago has no way of knowing what happened since. A registry accepting a company extract from 2019 is accepting a picture of a company that may no longer exist in that form.
The rule attaches to the underlying facts, not to the notarial act — which is why you sometimes see a document rejected as stale even though the notarisation is recent. Re-notarising a four-year-old police check produces a recent notarisation of an old document, and that usually fails.
If a document is rejected for age, work out which clock ran out.
The underlying document is stale. You need a fresh document from the issuing body, then a fresh notarisation, then a fresh apostille or authentication. The whole chain is redone. This is the common case and the expensive one.
The document is fine but the notarisation is old. Re-notarise. For a certified true copy this means producing the original again. For an attested signature it means signing again in front of the notary — a notary cannot attest a signature made in the past.
Everything is current but the apostille or authentication is old. Some authorities impose an age limit on the DFAT certificate itself. The underlying notarial act may still stand, in which case only the DFAT step repeats, but this depends on the receiving body and is worth confirming before you assume it.
Without being prescriptive about any particular country's rule, these are the categories that attract recency requirements most often:
These record events that do not change, and are ordinarily accepted whatever their issue date — though the notarised copy of them may still need to be recent:
Note the split: the authority may accept a fifty-year-old birth certificate while insisting the certified copy of it was made in the last three months. That is consistent, even if it feels absurd at the counter.
Ask the receiving body for its rule in writing before you start. Ask whether the window runs from the issue of the underlying document, the date of notarisation, or the date of the apostille. These give three different deadlines and people routinely plan against the wrong one.
Find out whether the clock runs to submission or to decision. Some authorities require the document to be current when lodged; others require it to be current when the matter is decided, which can be months later.
Sequence the chain tightly. If a three-month window applies, obtaining the underlying document, notarising it, and obtaining the apostille across a leisurely ten weeks leaves almost nothing. Do them close together.
Order spare certified copies at the same appointment. Additional copies made at the original appointment are usually cheaper than a second appointment later, and they carry the same date — which helps only if you use them inside the window, so do not over-order for a purpose that is months away.
Does a notary's seal expire? No. The seal is not dated in that sense. If the notary's own appointment ends, acts already performed remain valid — they were valid when performed, and the register records them.
Does an apostille expire? The certificate itself has no expiry. Receiving authorities frequently impose their own age limit on it. Same distinction as above.
Can I reuse a notarised document for a second purpose? Sometimes. Many authorities retain the document, so you physically cannot. Where the document is returned, whether it is accepted elsewhere is the second authority's decision. Ordering extra certified copies up front is usually cheaper than discovering this late.
My document was notarised last year and the notary has since retired. Is it still good? Yes, subject to the receiving authority's recency rule. The notary's register and DFAT's specimen records support verification of past acts.
Is there an Australian law setting how long a notarised document lasts? No general rule of that kind applies. The limits you encounter come from the receiving authority.