Sick Leave with a Medical Certificate

Sick leave is one of those employment issues that seems simple until you’re actually managing it in real time: a staff member calls in unwell, you need to adjust the roster, and you’re trying to work out what evidence you can ask for (and when).

For small businesses, it’s not just about “following the rules” - it’s about running a workable team, keeping things fair across staff, and reducing the risk of disputes. That’s why understanding sick leave and medical certificate requirements is so important.

In this guide, we’ll walk you through the essentials of sick leave with a medical certificate in Australia, including when you can request evidence, what counts as acceptable evidence, how to handle repeat absences, and how to set expectations in your contracts and policies.

What Is Sick Leave (Personal/Carer’s Leave) And When Does Evidence Matter?

Under the National Employment Standards (NES) in the Fair Work Act 2009 (Cth), eligible employees can access paid personal/carer’s leave (commonly called sick leave) when they are unfit for work because of a personal illness or injury.

As an employer, you’re generally entitled to ask for evidence that would satisfy a reasonable person that:

the employee was genuinely unfit for work (or needed to provide care/support to an immediate family/household member); and
the leave was taken for the stated reason.

This is where medical certificates most often come up. A medical certificate is one common way an employee can provide evidence - but it’s not the only way (more on that below).

Why Evidence (Like A Medical Certificate) Is Important For Small Businesses

In practice, evidence requirements help you:

manage payroll and leave balances properly;
reduce misunderstandings (“Do I need a certificate for one day?”);
apply consistent standards across your team; and
protect your business if you later need to manage performance, conduct, or excessive absenteeism.

It’s worth treating evidence as a normal process, not a personal challenge to an employee’s integrity. When expectations are clear from day one, most issues become much easier to handle.

When Can You Ask For Sick Leave With A Medical Certificate?

A common misconception is that you can only ask for a medical certificate after a certain number of days off (for example, “two days or more”). In reality, the general rule under the NES is:

You can ask for evidence for any period of personal/carer’s leave, as long as your request is reasonable.

That said, “reasonable” is doing a lot of work here. Your approach should be consistent, practical, and aligned with any applicable Modern Award, enterprise agreement, or employment contract terms.

Common (Reasonable) Situations Where Employers Request A Medical Certificate

Absences on a Monday or Friday (especially where there’s a pattern).
Absences immediately before or after annual leave or public holidays.
Frequent short absences (for example, repeated single days off).
During peak business periods where staffing is critical (while still being careful not to discourage genuine leave).
Where your workplace policy requires evidence for certain scenarios, and that policy has been communicated to staff.

It’s also common for Modern Awards to include specific rules about evidence (including timeframes for providing it). If you’re unsure which Award covers your staff, it’s a good idea to get clarity early so your sick leave processes line up with your obligations.

Can You Require A Medical Certificate Every Time?

You can set a policy that evidence is required for sick leave (including for one day), but you should be careful about applying this in a way that becomes unreasonable in practice.

For example, if a staff member has a one-off gastro bug and can’t easily access a GP appointment the same day, a strict “certificate or no pay” approach may create unnecessary friction - and may not be the best risk-managed approach for your culture and retention.

A balanced approach is to:

set clear expectations in writing;
apply them consistently; and
allow some practical flexibility where appropriate.

What Counts As A Valid Medical Certificate Or Other Evidence?

If you’re managing sick leave and medical certificates, it helps to know what “evidence” can look like. Under the NES, employees need to provide evidence that would satisfy a reasonable person - and the type of evidence can vary.

Medical Certificates

A medical certificate is typically issued by a registered medical practitioner (for example, a GP). In many cases, it may also be issued by other registered health practitioners, depending on the circumstances and how the certificate is drafted.

In most workplaces, a medical certificate should include enough information to confirm the employee was unfit for work (or needed to provide care), and cover the relevant date(s). It does not usually need to disclose a diagnosis, and you should be cautious about requesting personal medical details unless there’s a lawful reason and it’s genuinely necessary.

Statutory Declarations

In some cases, an employee may provide a statutory declaration (stat dec) instead of a medical certificate. This can happen where the employee couldn’t reasonably access a medical appointment, or where the leave relates to caring responsibilities.

A stat dec can be a valid form of evidence if it would satisfy a reasonable person. If you want a practical example of how these are typically structured, statutory declaration requirements and format are worth understanding so you know what to look for.

Do You Have To Accept Any Medical Certificate?

Usually, yes - if it appears genuine and covers the relevant period. However, if you have legitimate concerns (for example, a certificate that looks altered, inconsistent information, or repeated certificates that don’t align with patterns of attendance), you should tread carefully.

Rather than accusing an employee of dishonesty, a safer approach is to:

check whether your policy has been followed (e.g. timing, notice requirements);
ask neutral, factual questions; and
consider whether you need further information for work health and safety or operational planning (without demanding private details).

How To Handle Sick Leave Requests And Medical Certificates In Practice

Even if you understand the legal rules, the day-to-day reality of sick leave can still be tricky - particularly when you’re managing rosters, deadlines, and customer expectations.

Here are practical steps small businesses can use to manage sick leave with medical certificate requests fairly and consistently.

1. Set Clear Notice Requirements

Employees should notify you as soon as possible that they’re unwell and won’t be attending work. Your expectations can be set in a workplace policy (for example: call the manager by 7am, and follow up by text/email if unanswered).

If you operate a shift-based workplace, it’s also a good idea to have clear rules around rostering changes and cancellations. Many disputes start with “I didn’t know I had to call” or “I didn’t know the shift was changed.” Having clear processes can help, including around shift changes and minimum notice expectations.

2. Specify When Evidence Is Required

Your policy might say, for example:

evidence is required for any sick leave of 2 or more consecutive days; and/or
evidence may be required for single-day absences where there is a pattern or operational impact; and/or
evidence must be provided within a certain timeframe (e.g. within 48 hours or before the next rostered shift).

This sets a default rule while still giving you flexibility when something doesn’t look right.

3. Keep Your Approach Consistent (To Avoid Discrimination And Fairness Issues)

Consistency matters. If you request a medical certificate from one staff member for a one-day absence, but not from another in similar circumstances, you can create:

perceived unfairness across the team;
higher risk of complaints; and
potential legal risk if inconsistent treatment overlaps with a protected attribute (for example, disability, pregnancy, or family responsibilities).

That doesn’t mean every situation must be handled identically - but it does mean you should have a fair framework you can explain.

4. Store Medical Certificates Securely

Medical certificates contain sensitive information, even when they’re brief. Treat them as confidential HR records and store them securely, with access limited to people who genuinely need it.

If your business also collects personal information more broadly (for example, customer data through a website or online systems), it can be worth checking whether your broader privacy practices are up to date, including whether you need a Privacy Policy for those business operations. Note that employee records are often handled differently under Australian privacy law (including the “employee records exemption” in some cases), but you should still handle medical information carefully and consistently.

Tricky Scenarios: Repeat Sick Leave, Suspected Misuse, And Medical Clearances

Most sick leave requests are straightforward. The harder situations usually involve patterns, extended absences, or employees returning to work when you’re concerned about safety.

Frequent Single-Day Absences

If an employee regularly takes single days off and provides medical certificates each time, it can be frustrating - but a pattern alone doesn’t automatically mean misconduct.

A sensible way to manage this is to:

track leave patterns (without making assumptions);
hold a supportive check-in conversation (“Is everything okay? Is there anything we can do to support you?”);
remind them of your evidence and notice requirements; and
if necessary, move into a formal performance management process if attendance is impacting the role.

If you suspect an underlying medical issue, you may need to think about reasonable adjustments and your obligations around discrimination and workplace health and safety.

Suspected Misuse Of Sick Leave (What Can You Do?)

If you genuinely think an employee is abusing sick leave (for example, calling in sick and then working elsewhere or posting evidence of leisure activities during “sick leave”), your next steps should be cautious and process-driven.

Generally, you’ll want to:

gather facts (not assumptions);
check your contracts/policies and any Award provisions;
give the employee an opportunity to respond; and
document your process carefully.

In more serious cases, you might consider directing the employee not to attend work while you investigate, but whether you can “stand down” (and whether they must be paid) depends on the Fair Work Act, any applicable Award or enterprise agreement, and the employee’s contract. This is a high-risk step and should be handled carefully. If this comes up in your business, it’s worth reading about standing down an employee pending investigation so you understand when it may (and may not) be appropriate.

Can You Ask For A Medical Clearance To Return To Work?

Sometimes the issue isn’t taking sick leave - it’s returning to work safely. If an employee has had an illness or injury that could affect their ability to perform their duties safely (or could affect others), you may be able to request a medical clearance (for example, “fit for work” confirmation).

This is most common for:

roles involving physical tasks or machinery;
roles involving safety-critical work (e.g. driving);
where the employee has been on extended leave; or
where there’s a genuine risk if they return too early.

However, the request must be reasonable and connected to the inherent requirements of the role. If you’re unsure where the line is, medical clearance requests are an area where getting tailored advice can prevent missteps.

How To Protect Your Business With The Right Contracts And Policies

Many sick leave disputes don’t start because someone is acting in bad faith - they start because expectations were never clearly documented.

For small businesses, your best protection is having the right foundation in place:

an employment contract that matches your engagement model (full-time, part-time, casual);
workplace policies that explain how leave, notice, and evidence work in your business; and
a consistent HR process when things get complicated.

Employment Contracts

Your contract can set out (in plain English) practical requirements like:

how notice must be given (who to call and when);
when evidence may be required;
what happens if evidence isn’t provided; and
how misconduct and performance issues are handled.

If you’re tightening up your documentation, having a tailored Employment Contract can be a strong starting point, especially where you need conditions that fit your operations (e.g. shift-based work, remote work, or customer-facing roles).

Workplace Policies (Including Leave And Evidence Policies)

Contracts are important, but policies are where you can give the “how we do things here” detail without cluttering the contract.

A solid leave policy might cover:

how to notify the business of an absence;
what evidence is accepted (medical certificate, statutory declaration);
timeframes for providing evidence;
how you handle repeated absences; and
confidentiality and record-keeping.

Policies are also useful because they can be updated as your business grows - as long as updates are communicated and applied fairly.

Don’t Forget The Award And Your Minimum Legal Obligations

One of the most common employer traps is relying on “what we’ve always done” rather than checking the relevant Award or agreement.

If your Award has stricter evidence rules (or specific processes), those rules may effectively set your minimum standards. Your policies should align with those minimum requirements, not undermine them.

If you’re unsure whether your leave processes are compliant (or you’re seeing repeated sick leave issues and want to manage them properly), it’s often worth getting an overall review of your employment compliance and documentation.

Key Takeaways

Medical certificate questions usually come down to evidence: under the NES, you can request evidence that would satisfy a reasonable person for personal/carer’s leave.
You can request evidence for any period of sick leave, but your request should be reasonable and applied consistently across the team.
A medical certificate is common evidence, but a statutory declaration may also be acceptable depending on the circumstances and what would satisfy a reasonable person.
For repeat absences or suspected misuse, focus on a fair process: gather facts, give the employee a chance to respond, and document your steps before taking action.
You may be able to request medical clearance to return to work where it’s reasonable and connected to the role’s inherent requirements and workplace safety.
Clear employment contracts and workplace policies make sick leave and medical certificate requirements far easier to manage (and help reduce disputes).

If you’d like help setting up your sick leave processes, updating your policies, or putting the right documents in place for your team, reach out to Sprintlaw at 1800 730 617 or team@sprintlaw.com.au for a free, no-obligations chat.

Official Sources to Check

Rules and regulator guidance can change. Check the current official material most relevant to this issue before relying on the article:

Sick Leave With a Medical Certificate: Australian Employer Guide