If you become sick while on annual leave, you don’t have to lose your hard-earned holiday days.
Employment lawyers regularly confirm that under the Fair Work Act 2009 (Cth), Australian employees have the legal right to substitute sick leave for annual leave if they become unwell during their planned holiday. This protection ensures you don’t spend your annual leave recovering from illness and preserves your holiday time for genuine rest and recreation.
Key Takeaways
- You can replace annual leave with sick leave if you fall ill during your holiday.
- This right is protected under the Fair Work Act 2009 and the National Employment Standards (NES).
- You must notify your employer as soon as possible, even after your leave has begun.
- Evidence may be required, such as a medical certificate or statutory declaration.
- Employers cannot force you to continue using annual leave if you are legitimately unwel
Your Right to Take Sick Leave While on Annual Leave
Many employees don’t realise they are protected if they fall sick during a booked holiday. If illness or injury prevents you from being fit for work (or from enjoying your planned break) you can request that those days be treated as personal (sick) leave rather than annual leave.
This ensures your paid annual leave is restored so you don’t lose valuable rest time.
This guide explains your legal rights, how to notify your employer, and what evidence you may need to provide.
The Legal Basics: National Employment Standards & Fair Work Act 2009
Your Main Leave Entitlements
Annual Leave
- Full-time employees receive 4 weeks of paid annual leave per year.
- Some shift workers receive 5 weeks.
- Part-time employees accrue leave on a pro-rata basis.
Personal/Carer’s (Sick) Leave
- Full-time employees receive 10 days of paid personal/carer’s leave annually.
- Part-time employees receive a pro-rata amount.
- Learn more about sick leave for casual employees in our article.
The “Substitution” Rule
If you’re sick or injured while on annual leave, you are legally entitled to swap annual leave days for sick leave.
Your employer must then return those annual leave days to your balance.
Protection Against Employer Pressure
Your employer cannot require you to stay on annual leave while you’re unwell.
If you’re genuinely sick and provide reasonable evidence, you are entitled to personal/carer’s leave – even if you’re overseas or interstate at the time.
What To Do If You Get Sick on Annual Leave: Step-by-Step Guide
Step 1: Notify Your Employer Immediately
Tell your employer as soon as possible that you’re unwell and need to take sick leave.
Notification can be by email, text, phone call, or your usual method.
Step 2: Record the Dates You Were Sick
Write down the exact dates you were unwell. This ensures correct adjustment of your leave balances.
Step 3: Request the Substitution in Writing
Example wording:
“I was unwell from 10–12 January and request that these days be treated as personal/sick leave.”
Step 4: Provide Evidence If Requested
Your employer may ask for evidence – even for a single day.
Step 5: Check Your Leave Balances
Your employer should:
- Deduct those days from your sick leave
- Restore the annual leave days back to your balance
Notice and Evidence Requirements
Notice Rules
You must tell your employer as soon as reasonably possible, even if your leave has already started.
The law recognises illness can occur unexpectedly.
Acceptable Evidence
Evidence must satisfy a “reasonable person” test. Common acceptable forms include:
Medical Certificate
Issued by an AHPRA-registered doctor, specialist, or nurse practitioner, confirming you were unfit for work.
Statutory Declaration
Used when a medical certificate is not practical.
Retrospective Certificate
A backdated certificate is still valid if it reflects when illness genuinely occurred.
How Long Evidence Can Be Required
Employers can legally request evidence for any period of sick leave – even one day.
Some workplaces only require certificates after two days, but this is a workplace policy, not a legal rule.
Frequently Asked Questions
Can my employer refuse to change my annual leave to sick leave?
No. If you were genuinely unwell and provide reasonable evidence upon request, your employer must treat those days as personal/carer’s leave. They cannot force you to stay on annual leave.
Do I still get paid while taking sick leave during annual leave?
Yes. Sick leave is paid. Your employer must pay you normally and return those annual leave days to your balance.
What if I couldn’t see a doctor when I got sick?
You can provide a retrospective medical certificate or a statutory declaration. The Fair Work Act does not require evidence to be issued on the day you became ill.
Do I need to tell my employer straight away if I get sick?
You must notify your employer as soon as reasonably possible, even if your annual leave has already begun.
Can I use sick leave if someone in my family becomes unwell while I’m on annual leave?
Yes. You may be able to use carer’s leave instead of annual leave if an immediate family or household member becomes sick or injured and requires your care.
