Does a certificate of currency guarantee a claim will be paid?

No. It confirms a policy existed on the day it was issued. Whether a specific claim is paid depends on the policy wording and the circumstances of the loss, neither of which the certificate describes.

If I hold a certificate, does that mean the premium is paid up?

Not necessarily. A certificate is a snapshot of the policy record at the point it was issued. A policy can still be cancelled for non-payment afterwards.

Can a certificate be relied on for an entire project?

Only for the period it states on its face, and only if nothing changes the policy in the meantime. That is why parties collecting certificates re-check them rather than filing the first one and moving on.

Is a certificate the same as proof the work itself is covered?

No. It lists classes of cover, not activities. Whether a specific job falls inside the policy wording is a question the certificate does not attempt to answer.

What a certificate of currency actually proves

In short

A certificate confirms a policy was recorded as in force on the day it was issued. It is a snapshot, not a guarantee for any date before or after that.
It does not confirm a specific claim will be paid. Whether a claim is covered depends on the policy wording, not on anything printed on the certificate.
It does not confirm the premium is fully paid or that the policy cannot be cancelled. Either can change the picture after the certificate is handed over.

A certificate of currency is a short document stating that a named policy existed and was in force when the insurer or broker produced it. That is the whole claim it makes. It is evidence that a policy exists, not evidence of what that policy will pay out in any particular situation.

Landlords, principals and licensing bodies collecting certificates often treat the document as if it answered more than it does. Knowing exactly what it proves — and where its authority stops — changes how much weight to put on it and what else is worth asking for.

What the document actually confirms

A certificate states the insured name, the policy number, the insurer, the classes of cover, the period of insurance and usually the limit for each class. Every one of those is a fact about the policy record as it stood on the day the certificate was produced.

Because it is generated straight from the insurer’s or broker’s own system rather than drafted by hand, it is a reliable statement of what was on file at that moment. That is the entire job it is built to do.

What it does not confirm

It does not confirm that a specific claim will be accepted. Whether an insurer pays a claim depends on the policy wording, the circumstances of the loss and any exclusion or condition that applies to it — none of which appear on a certificate.

It does not confirm the premium has been paid in full, and it does not prevent the policy being cancelled after the certificate is issued. A policy that was genuinely in force on the day of issue can still lapse before the work it was meant to cover is finished.

It does not confirm the insured actually holds cover for every activity it performs. A certificate lists classes of cover, not a description of the work being done, so it says nothing about whether a particular job falls inside the policy wording.

Why it gets treated as more than it is

A certificate is quick to produce and easy to read, which is why it is the default document requested for site access, tender compliance and licence renewal. It answers the first and most common question — does a policy exist — cheaply and fast.

Beyond that first question, the certificate is the wrong document to lean on. A dispute about what a policy actually covers is answered by the policy wording and the schedule, not by a one-page summary of them.

Questions

Does a certificate of currency guarantee a claim will be paid?: No. It confirms a policy existed on the day it was issued. Whether a specific claim is paid depends on the policy wording and the circumstances of the loss, neither of which the certificate describes.
If I hold a certificate, does that mean the premium is paid up?: Not necessarily. A certificate is a snapshot of the policy record at the point it was issued. A policy can still be cancelled for non-payment afterwards.
Can a certificate be relied on for an entire project?: Only for the period it states on its face, and only if nothing changes the policy in the meantime. That is why parties collecting certificates re-check them rather than filing the first one and moving on.
Is a certificate the same as proof the work itself is covered?: No. It lists classes of cover, not activities. Whether a specific job falls inside the policy wording is a question the certificate does not attempt to answer.

Sources

ASIC — Regulator of the AFS licensees and authorised representatives — including brokers — who issue certificates of currency.
Insurance Council of Australia — Industry body for Australian general insurers; publishes general consumer explainers on how insurance works.