How To Write A Probation Extension Letter For Australian Employers

Probation can be a really useful tool for small businesses. It gives you time to confirm a new hire is the right fit for the role, your team and the pace of your workplace.

But sometimes, by the end of probation, you’re not ready to make a final call. Maybe the employee has shown potential but hasn’t consistently met expectations yet. Maybe there’s been leave, training delays, or a change in duties. In these situations, extending probation can feel like a sensible middle ground.

To do it properly, you’ll usually need a clear, well-structured probation extension letter. It’s not just “paperwork” - it’s how you communicate expectations, confirm the extended period, and reduce misunderstandings (and disputes) later.

Below, we’ll walk you through how to write a probation extension letter for an Australian workplace, what to include, and the common legal and practical pitfalls to avoid.

What Is A Probation Extension Letter (And When Should You Use One)?

A probation extension letter is a written notice to an employee confirming that:

• their probation period is being extended (rather than confirmed or ended),
• the new probation end date,
• the reasons for extension (in plain, factual terms), and
• what needs to improve during the extension period.

You’d typically use an extension of probation period letter where you have genuine reasons to allow more time to assess performance or conduct, rather than making a final decision based on incomplete information.

Common Scenarios Where An Extension Makes Sense

• Training wasn’t completed (for example, due to operational constraints or system delays).
• The role changed shortly after commencement, so performance hasn’t been assessed against stable duties.
• The employee took leave (annual leave, personal leave or unpaid leave) so you haven’t had enough “on the job” time to evaluate.
• Performance is mixed - some strengths, but not yet consistent or meeting key requirements.
• Behavioural or cultural fit concerns that need clearer expectations and time to improve.

Whatever the reason, extending probation should be handled carefully and consistently. A probation extension letter helps you document the process and ensure the employee understands what happens next.

Can You Extend Probation In Australia? Key Legal Considerations

In Australia, probation periods aren’t a single “standalone” legal regime, but what you do during probation is still regulated by employment laws and can have legal consequences.

Before you issue a probation extension letter, it’s worth checking these key points.

1. Check The Employment Contract First

Your first step is to look at the employee’s employment contract. Many contracts set out:

• the length of the probation period (for example, 3 or 6 months),
• whether probation can be extended, and
• how much notice applies during probation (often a shorter notice period).

In most cases, you should only extend probation if your contract allows it. If it doesn’t, you may still be able to extend by genuine agreement - but you should get the employee’s written confirmation (typically by signing the letter) before the original probation end date.

If you don’t already have a clear written contract in place, it’s worth putting one in place early, such as an Employment Contract, so that probation and notice settings are properly documented from day one.

2. Don’t Confuse Probation With Unfair Dismissal “Minimum Employment Period”

A common misconception is that “probation” automatically means the employee can’t make an unfair dismissal claim. In reality, the Fair Work Act looks at whether the employee has served the minimum employment period (generally 6 months, or 12 months for a small business employer).

So even if you extend probation, the employee may still pass the minimum employment period while they’re in an “extended probation” arrangement. Extending probation won’t prevent unfair dismissal eligibility once that minimum period is met, which is why performance management during the extension needs to be genuine, documented, and procedurally fair.

3. Be Careful With Discrimination And Adverse Action Risks

Even during probation, you can’t take action (including extending probation or ending employment) for a prohibited reason - for example, because of pregnancy, disability, age, race, or because the employee exercised a workplace right.

This doesn’t mean you can’t extend probation. It means you should be able to clearly show your extension is based on legitimate business reasons like performance, conduct, or capability, not personal attributes or protected reasons.

4. Consider Any Award Or Enterprise Agreement Requirements

Many employees are covered by a modern award or enterprise agreement, which may affect things like:

• minimum notice periods,
• classification levels and duties, and
• performance management expectations.

Even during probation, you still need to comply with the National Employment Standards (NES) and any applicable award or agreement conditions (including notice requirements). If you’re unsure whether a probation extension interacts with award obligations, it’s worth getting advice early.

5. Small Business Employers: Keep The Small Business Fair Dismissal Code In Mind

If you’re a small business employer (generally fewer than 15 employees), and you’re considering ending employment during or after an extended probation period, you should also be mindful of the Small Business Fair Dismissal Code. Following the Code can be important in defending an unfair dismissal claim where the minimum employment period has been met.

What To Include In A Probation Extension Letter (A Practical Checklist)

The best probation extension letters are clear, specific and calm in tone. Your goal is to confirm the extension and create a practical improvement plan - not to “build a case” or overwhelm the employee.

Here’s what we recommend including.

1. A Clear Heading And Date

• Use a heading like “Probation Extension Letter”.
• Include the date of the letter.

2. Employee Details And Role Information

• Employee name
• Position title
• Start date
• Original probation end date

3. Confirmation That Probation Is Being Extended

State clearly that probation is being extended, and that employment continues during the extended probation period.

4. The New Probation End Date (And Length Of Extension)

Be precise. For example: “Your probation period is extended by four (4) weeks, to end on [date].”

Avoid vague language like “we’ll review later” without a clear date.

5. Reasons For The Extension (Facts, Not Feelings)

This is one of the most important parts of a probation extension letter. Keep it:

• factual (what happened, what was observed),
• specific (examples help), and
• linked to role requirements (not personality judgments).

For example, instead of “Your attitude isn’t right,” you might say: “We’ve observed difficulties meeting agreed customer response timeframes and following the internal escalation process.”

6. Expectations During The Extended Period

This is where you turn the letter into a forward-looking plan. Outline the key areas that need improvement, such as:

• quality of work and error rates,
• time management and meeting deadlines,
• communication with clients or the team,
• following procedures and policies,
• attendance, punctuality, or reliability.

Where possible, set measurable targets (even simple ones). For example, “respond to customer emails within 1 business day” or “complete X training module by Y date”.

7. Support And Training You’ll Provide

Extending probation shouldn’t be a passive “wait and see”. The letter should mention what support you’ll provide, for example:

• additional training,
• more frequent check-ins,
• buddying with a senior team member,
• updated KPIs or clearer role priorities.

This helps show the extension is genuine and gives the employee a fair opportunity to improve.

8. Review Meetings And A Final Decision Process

State when you’ll review performance and what happens at the end of the extended probation period. For example:

• a mid-extension review date, and
• a final review meeting near the end date.

You can also flag possible outcomes: confirmation of ongoing employment, further action (if contractually allowed), or termination of employment.

9. Notice And Contract Terms (If Relevant)

If your contract provides a specific notice period during probation, you can restate it briefly (without turning the letter into a legal essay).

This is also a good time to make sure your key employment documents are aligned - including any workplace policies in a Workplace Policy framework, so expectations are consistent across your team.

10. Employee Acknowledgement And Signature

End the letter by asking the employee to sign and return it to confirm they understand the extension and expectations.

Even if you email the letter, it’s helpful to request an email acknowledgement (or use e-signing).

How To Write The Letter: Structure, Tone, And Common Mistakes To Avoid

A probation extension letter works best when it feels fair and practical. If it’s too harsh, vague, or inconsistent with what you’ve said verbally, it can backfire.

A Simple Structure That Works

• Open positively but clearly: confirm you value the employee’s contributions while noting you need more time to assess fit.
• State the extension and new end date: short and direct.
• Explain the reasons: include 2–5 concrete examples (not an exhaustive list).
• Set expectations and supports: what success looks like and how you’ll help.
• Explain next steps: review dates and final decision point.
• Ask for acknowledgement: signature or written confirmation.

Mistakes We Often See Small Businesses Make

• Extending probation without telling the employee until the last minute (which can feel unfair and damage trust).
• Being too vague (“you need to improve performance”) without examples or measurable goals.
• Overloading the letter with everything that has ever gone wrong, rather than focusing on key improvement areas.
• Using emotional language (“disappointing”, “not committed”) instead of objective role-related language.
• Not following through (no check-ins, no support, no documented reviews), which undermines the whole purpose of extending probation.

If you’re already at the point where you’re considering ending employment, it’s also worth thinking about whether your termination process is aligned with your legal obligations - including notice requirements, the NES, and documentation. In some cases, a structured approach like a show cause letter process may be more appropriate than a probation extension.

Probation Extension Letter Example (Simple Template You Can Adapt)

Below is a practical example you can adapt. Every workplace is different, so treat this as a starting point - the wording should match your contract, your industry, and the actual performance concerns.

Sample Probation Extension Letter

[Date]

Private & Confidential

[Employee Name]
[Employee Address]

Dear [Employee Name],

Re: Extension Of Probation Period

We are writing to confirm an extension to your probation period in your role as [Position Title], which commenced on [Start Date]. Your original probation period was due to end on [Original End Date].

After reviewing your performance to date, we have decided to extend your probation period by [X weeks/months] to [New End Date]. This extension is to allow additional time to assess your performance and provide further support to help you meet the requirements of your role.

Reasons for extension
The key areas requiring improvement include:

• [Example 1: e.g. Meeting agreed deadlines for weekly reporting]
• [Example 2: e.g. Following internal processes for customer escalations]
• [Example 3: e.g. Accuracy and attention to detail in order processing]

Expectations during the extended probation period
During the extended probation period, you will be expected to demonstrate improvement in the areas above. We will review your progress against the following expectations:

• [Expectation 1: measurable goal]
• [Expectation 2: measurable goal]
• [Expectation 3: measurable goal]

Support and review process
To support you, we will provide:

• [Support item 1: additional training/coaching]
• [Support item 2: weekly check-in meetings]

We will conduct a review meeting on [Mid-Point Review Date], and a final probation review meeting on or near [Final Review Date]. At the end of the extended probation period, we will confirm whether your employment will be confirmed or whether further action is required.

Please sign and return a copy of this letter to acknowledge receipt and understanding.

Kind regards,
[Name]
[Title]
[Business Name]

Acknowledgement
I, [Employee Name], acknowledge and understand the contents of this letter, including the extension of my probation period to [New End Date].

Signature: ______________________ Date: ______________________

If you want your probation settings to be consistent across hires, it’s worth ensuring your documentation is aligned (including your Employment Contract and any internal processes for performance management).

Key Takeaways

• A well-drafted probation extension letter confirms the new end date, explains why probation is being extended, and sets clear expectations for improvement.
• Before extending probation, check the employment contract and ensure the extension is permitted (or genuinely agreed in writing by the employee before the original end date).
• Be mindful that “probation” is not the same as the unfair dismissal minimum employment period - an employee may gain unfair dismissal eligibility even during extended probation.
• The best extension of probation period letters are factual, specific and forward-looking, with measurable expectations and real support.
• Keeping your employment paperwork consistent (contracts, the NES, awards/agreements and workplace policies) helps you manage probation fairly and reduce disputes.

If you’d like help preparing a probation extension letter or reviewing your probation clauses and employment documents, reach us at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.