Many Australian employers use probation periods in employment contracts, but confusion about what actually protects employers—and what doesn’t—costs thousands annually in unnecessary unfair dismissal claims.

Here’s the truth: what matters under Fair Work law isn’t your 3-month probation clause—it’s the minimum employment period. And there’s a critical difference between a “probation period” and a “trial period” that most employers miss.

In this guide, we’ll break down exactly how probation periods work under the Fair Work Act 2009 (Cth) (see full text), the legal minimums you must meet, and how to structure your employment contracts to actually protect your business.

What’s the Difference: Probation vs Trial Period vs Minimum Employment Period?

These terms sound similar but they mean very different things in Australian employment law. Getting this wrong can leave you exposed to unfair dismissal claims even if an employee fails their “probation.”

Probation Period (Contractual)

A probation period is a contractual term you include in the employment agreement. It typically lasts 3–6 months and signals your intention to assess whether an employee is suitable for the role. It has no legal effect under Fair Work law—it’s purely a contract term you set.

Common probation terms: “The employee will be on probation for 3 months.”

What this actually means for dismissal: Nothing. Even if the employee “fails probation,” you still must follow fair dismissal procedures (as guided by the Fair Work Ombudsman) and meet minimum employment period thresholds.

Trial Period (Fair Work Minimum)

A trial period is a statutory protection under the Fair Work Act 2009 (Cth) (see full text), section 382. It’s the legal minimum employment period before an employee can claim unfair dismissal. This is what employers often confuse with their contractual probation clause—and it’s the real protection.

The trial period depends on your business size:

• Businesses with 15+ employees: 6-month trial period (minimum employment period)
• Small businesses (fewer than 15 employees): 12-month trial period (minimum employment period)

What this means: An employee dismissed before completing the trial period cannot lodge an unfair dismissal claim with the Fair Work Commission, even if your dismissal was rough or unfair. This is the only real “protection” Fair Work law gives you during early employment.

Minimum Employment Period (What Actually Matters)

The minimum employment period is the statutory hurdle your employee must clear before they can claim unfair dismissal. Once they pass this threshold, standard unfair dismissal protections apply—meaning you must show your dismissal was fair and followed proper process.

The key rule: An employee is protected from unfair dismissal only if they’ve completed the minimum employment period AND have been dismissed for a valid reason AND were given procedural fairness (notice, investigation, right of response).

Probation Periods Under Fair Work: What Employers Get Wrong

The biggest mistake we see: employers assume a probation clause in the contract means they can dismiss freely during that period. It doesn’t.

Here’s what the law actually says:

A Probation Clause Does NOT Override the Trial Period

If you insert a 3-month probation clause but work for a business with 15+ employees, the statutory 6-month trial period still applies. The probation clause is just a contractual reminder—it doesn’t shorten the legal minimum employment period.

Example: You hire an admin officer with a 3-month probation clause in her contract. She’s underperforming after 2 months. You dismiss her for “failing probation.” She can’t claim unfair dismissal because she hasn’t completed the 6-month minimum employment period. The probation clause played no legal role—the trial period protection did.

But if she was dismissed unfairly (no investigation, no notice, personality clash): After 6 months, she can lodge a claim, and the probation clause becomes irrelevant.

Employees Still Have Rights During Probation

Even during a probation period (or trial period), employees retain all National Employment Standards (NES):

• Maximum weekly hours (38 hours + reasonable additional hours)
• Annual leave (20 days/year, or 26 if eligible)
• Personal/carer’s leave
• Parental leave
• Long service leave (after eligibility period)
• Public holidays
• Notice of termination (at least 1 week for probationary employees, or as per contract)
• Superannuation (guaranteed 11.5% of ordinary time earnings)

You cannot deny these rights because an employee is on probation. This is a compliance risk many small employers overlook.

Reduced Notice During Probation—But Not Zero

While it’s common to include a reduced notice clause for probationary staff (e.g., “1 week notice during probation vs 2 weeks after”), you must still provide at least 1 week unless the contract specifies a shorter period and the employee agrees. However, modern awards and the NES usually set a minimum notice floor.

Check the relevant modern award for your industry—some specify minimum notice even for probationary employees.

Minimum Employment Periods: The Real Timeline for Unfair Dismissal Claims

Here’s the hard numbers employers need:

Why this matters: An employee dismissed at 5.5 months (if you have 15+ staff) cannot claim unfair dismissal—period. They haven’t reached the 6-month threshold. After 6 months? They can lodge a claim within 21 days, and you’ll need to defend your dismissal decision.

Small businesses (15 or fewer employees) get an extra 6 months protection—employees don’t have unfair dismissal rights until 12 months. This is one of the few genuine small-business advantages in Fair Work law.

How to Structure Probation Clauses to Protect Your Business

1. Include a Clear Probation Term in the Contract

Even though probation clauses don’t legally override the trial period, including one shows intent and helps you manage expectations. Use wording like:

“The first 3 months of employment constitute a probation period during which the employee’s performance, conduct, and suitability for the role will be assessed. Employment may be terminated by either party during this period with 1 week written notice (or as per modern award minimums).”

2. Document Performance During Probation

This is critical. Even if the trial period means you can dismiss freely, if you later face an unfair dismissal claim (after the minimum employment period), you’ll need evidence that the dismissal was for a valid reason. Keep records:

• Regular check-ins with the employee
• Written feedback (positive and negative)
• Performance metrics or goals
• Any disciplinary conversations or warnings
• Emails confirming progress or concerns

3. Align Probation Length with Trial Period

For larger businesses (15+ employees), set your contractual probation period to match the 6-month trial period. This aligns employee expectations with legal reality. For small businesses, a 12-month probation clause mirrors the 12-month trial period.

4. Specify What “Passing Probation” Means

Don’t leave it vague. Define clear criteria or competencies the employee must demonstrate, e.g., “completion of induction training, demonstrated proficiency in core tasks, and satisfactory conduct.” This helps with both performance management and future legal defence if needed.

5. Confirm in Writing When Probation Ends

After the probation period, send a brief letter confirming the employee has successfully completed probation and is now a permanent/ongoing employee. This removes ambiguity and formalizes the transition.

Common Probation Mistakes That Cost Employers

Mistake #1: Dismissing During Probation Without Following Fair Process

Just because an employee hasn’t completed the minimum employment period doesn’t mean you can dismiss carelessly. Best practice: treat probation dismissals the same as any other dismissal—investigate, give the employee a right of response, document your reasoning.

Why? Because bad practice during probation can harm your reputation, invite claims from advocacy groups (if discrimination is suspected), and create evidence that your business culture tolerates unfair processes. Additionally, if the employee challenges your dismissal through other avenues (discrimination, general protections), you’ll need solid documentation.

Mistake #2: Confusing Probation with “At-Will” Employment

Australia doesn’t have at-will employment like the US. Even probationary staff are entitled to statutory protections, minimum notice, and NES entitlements. You can’t just “cut them loose” without process.

Mistake #3: Not Mentioning Modern Awards

Your probation clause may specify reduced notice, but your applicable modern award might override it with higher minimums. Always check your industry award.

Example: The Hospitality Industry (General) Award 2020 requires 2 weeks notice for all employees, regardless of probation status. If your contract says “1 week during probation,” the award requirement wins.

Mistake #4: Using Probation as an Excuse Not to Manage Performance

Some employers think: “They’re on probation, so we don’t need to give feedback—we can just fire them.” Wrong. Regular, constructive feedback during probation is fairer, helps the employee improve, and protects you legally because you’ve documented clear performance issues if dismissal becomes necessary.

Key Takeaways for Employers

• Probation clauses are contractual, not statutory. They don’t override Fair Work minimum employment periods.
• The real protection is the trial period: 6 months for businesses with 15+ employees, 12 months for small businesses. Employees can’t claim unfair dismissal before completing this period.
• NES entitlements apply from day one, even during probation. You must provide leave, superannuation, maximum hours, and notice rights.
• Document performance throughout probation. Future unfair dismissal claims (after the trial period) require evidence you acted fairly.
• Follow fair process even during probation. Investigation, right of response, and clear reasoning strengthen your legal position.
• Check your modern award for notice requirements, probation length maximums, or special conditions.
• Confirm in writing when probation ends. This formalizes the transition and removes ambiguity.

When to Seek Advice

Probation dismissals are usually straightforward, but get professional guidance if:

• The employee claims discrimination or general protections breaches
• You’re unsure whether the trial period or a different rule applies (modern awards, disability, etc.)
• The dismissal happens near the end of the probation period and the employee contests it
• Your modern award has special probation rules

A brief employment law check-in can save thousands in claims or reputational damage.

For expert guidance on probation dismissals, employment contracts, and modern awards, contact Fair Work Centre. Our membership includes direct access to experienced employment lawyers who can review your probation clauses and dismissal processes. Call 1300 161 828 or visit our membership plans to learn which option provides the right level of support for your business.

Employer Quick Reference: Minimum Employment Period by Business Size