How Long Does a Written Warning Last in Australia? (2026)

Q: How long does a written warning last in Australia?

There is no fixed expiry period for written warnings under the Fair Work Act 2009 (Cth). The Fair Work Commission assesses whether a warning is still relevant based on how long ago it was issued, whether the same issue has recurred, whether the employee had a genuine opportunity to improve, and whether the warning was proportionate. As a general guide, warnings are typically considered most relevant within 6 to 12 months of issue.

Q: Can I use a warning from 2 years ago to justify a termination?

Possibly — but it depends on the circumstances. The Fair Work Commission will consider whether the underlying issue is the same, whether behaviour improved and then declined again, and whether the overall pattern of conduct justifies the termination. A 2-year-old warning is generally weaker than a recent one, but it does not automatically expire. Recent warnings for the same issue are significantly more persuasive.

Q: Do I need to warn an employee again if they improved and then declined?

Yes — in most cases, if there has been a significant period of improvement followed by a return to the problem behaviour, the Commission is likely to expect a fresh warning before termination. The fact that an employee improved demonstrates they were capable of meeting the standard, which makes it harder to argue the previous warning is still sufficient basis for termination.

Q: How many warnings do I need before I can terminate in Australia?

There is no fixed number required under the Fair Work Act 2009 (Cth). The Commission looks at whether the overall process was fair — not whether exactly one, two, or three warnings were issued. In practice, most defensible terminations for ongoing performance involve at least one formal written warning followed by a genuine improvement period. More warnings are generally better.

Q: Should I put an expiry date on a warning letter?

This is optional and carries some risk. Including an expiry date (e.g. 'this warning will be disregarded after 12 months of satisfactory performance') can demonstrate good faith and clarity — but it also formally limits how long you can rely on the warning. Most employment lawyers advise against including a strict expiry date unless your internal policy requires it.

Written warnings do not automatically expire under the Fair Work Act 2009 (Cth). The Commission assesses relevance based on how long ago the warning was issued, whether the issue has recurred, whether there was genuine improvement in between, and whether the warning was proportionate. As a practical guide, 6 to 12 months is the window where a warning carries the most weight. Beyond that, it depends on context.

Last reviewed against Fair Work Commission decisions — April 2026

Quick Answer

Legal expiry: None — warnings do not formally expire
Practical relevance window: 6–12 months carries the most weight
Still relevant after 12 months if: the same issue has recurred and no significant improvement occurred
Less relevant if: the employee improved, the issue is different, or the gap is very long

The Commission assesses the full pattern of conduct — not just whether a warning was issued.

What the Fair Work Commission Actually Looks At

When assessing whether a previous warning supports a termination, the Commission considers:

Is it the same issue? A warning for lateness is relevant to a termination for lateness. A warning for lateness is much less relevant to a termination for a food safety breach.
How recent is it? A warning from 3 months ago carries more weight than one from 18 months ago for the same issue.
Was there genuine improvement? If the employee improved significantly after the warning and then later declined again, the Commission may expect a fresh warning before termination.
What did the warning say would happen? If the warning stated that further breaches would result in termination, and a breach has occurred, that strengthens the employer’s position. If the warning said nothing about consequences, it is weaker.
Was the warning itself procedurally fair? A vague or poorly documented warning provides less support than a specific, well-documented one.

Warning Relevance Over Time

Time Since Warning	Relevance to Termination	FWC Approach
0–3 months	Strong	Highly relevant if same issue recurs
3–6 months	Strong–moderate	Relevant — especially if specified in warning
6–12 months	Moderate	Relevant if same issue, weaker if employee improved
12–24 months	Weak–moderate	Less persuasive — may need fresh warning
24+ months	Weak	Unlikely to support termination alone for same issue

Not sure if your warning still counts?

If your warning is older than 6 months, involves mixed issues, or the employee improved in the interim — you may not be able to rely on it to support a termination.

Check If Your Warning Holds Up →

The Improvement — Then Decline Problem

One of the most common mistakes: an employee receives a formal warning, improves for 3–4 months, then reverts to the same behaviour. The employer believes the original warning still supports termination. The Commission often disagrees.

The improvement itself is evidence the employee was capable of meeting the standard. If they met it for several months before declining again, the Commission is likely to expect a fresh warning before termination.

The employee deserves to know their position is again at risk — not discover it for the first time at a termination meeting. A fresh warning, referencing the full history, is usually necessary.

This doesn’t mean restarting the process from scratch. It means updating it.

Real scenario: A venue issues a written warning to a waiter for repeated lateness in March. The waiter improves for six months. In September, the lateness resumes. The venue terminates without issuing a new warning, relying on the March letter. The Fair Work Commission finds the March warning no longer supports termination — the improvement demonstrated the employee could meet the standard, and the employer should have issued a fresh warning before terminating.

Common mistake: An employer relies on multiple old warnings across different issues — lateness, attitude, minor conduct — to justify termination. The Commission finds there was no clear, current performance issue; just a collection of outdated concerns without a coherent thread. The termination is found unfair. The employer had documented plenty — just nothing that told a clear, recent, single story.

Should You Put an Expiry Date on Warnings?

This is a judgment call. Including a clause like “this warning will be disregarded after 12 months of satisfactory performance” can demonstrate good faith and give the employee clarity. But it also formally limits how long you can rely on the warning — and removes your ability to argue it is still relevant beyond that point.

Most employment practitioners advise against including a fixed expiry date unless your internal policy requires it. A more effective approach is to reference the warning in any subsequent warning as part of the ongoing history — which preserves its relevance without fixing an artificial end date.

What Should You Do Right Now?

Warning under 6 months, same issue has recurred: you may be able to rely on it — but document the recurrence clearly before acting.
Employee improved then declined: issue a fresh formal warning referencing the history before any termination decision.
Warning covers a different issue: treat the new matter as a separate process — the old warning provides context but not support.
Warning is 12+ months old: assume you need a fresh one unless there was no intervening improvement whatsoever.
Still unsure: get clarity before you act. Relying on a warning that won’t hold up is more dangerous than taking an extra week to issue a fresh one.

Frequently Asked Questions

How long does a written warning last in Australia?

Warnings do not formally expire under the Fair Work Act 2009 (Cth), but their relevance diminishes over time. The 6–12 month window is where a warning carries the most weight. Beyond that, the Commission considers whether the same issue has recurred, whether improvement occurred in the interim, and whether a fresh warning would have been appropriate before termination.

Can I use a warning from 2 years ago to justify a termination?

Possibly — but it will carry limited weight on its own. The Commission will consider whether the underlying issue is the same, whether the employee improved and then declined again, and whether the overall pattern justifies the termination. A 2-year-old warning is significantly weaker than a recent one. In most cases, a fresh warning should be issued before relying on a warning of this age to support termination.

Do I need to warn an employee again if they improved and then declined?

In most cases, yes — if there was a significant period of improvement before the decline. The improvement itself demonstrates the employee was capable of meeting the standard. The Commission is likely to expect a fresh warning before termination, referencing the previous history. This doesn’t restart the process — it updates it.

How many warnings do I need before I can terminate in Australia?

There is no fixed number under the Fair Work Act 2009 (Cth). The Commission looks at whether the overall process was fair, not whether exactly one or three warnings were issued. In practice, most defensible terminations for performance involve at least one formal written warning followed by a genuine improvement period. See our guide on warnings before firing in Australia.

Should I put an expiry date on a warning letter?

Generally no — it formally limits your ability to rely on the warning beyond that point. A better approach is to reference previous warnings in subsequent warnings and in any termination letter, creating a documented history without an artificial expiry. If your internal policy requires an expiry date, include it — but be aware of how it limits your later options.

The question of whether a warning is still relevant is one the Commission decides — not the employer. The safest approach is to treat warnings as part of a living record: reference them in future warnings, update them when behaviour improves and declines, and never rely on a single old warning as the sole basis for termination.

Know Before You Terminate

Ask Fitz HR whether your existing warnings support a termination decision — before you act on them. Relying on a warning that won’t hold up is one of the most avoidable unfair dismissal mistakes.

Check If Your Warning Supports Termination →