An employee calls in sick on a Monday, but their paid sick leave ran out three weeks ago. Someone else is halfway through an approved holiday when they end up in hospital. A third employee simply asks to use annual leave because they don't want sick leave on their record. Each situation asks the same underlying question: which leave bucket applies, and who gets to decide?
The real question behind the choice
On the surface this looks like a payroll classification problem. In practice it is a compliance question with consequences for the employee's entitlements, your record-keeping obligations, and the employment relationship. The Fair Work Act 2009 (Cth) sets the floor through the National Employment Standards (NES), and any award or enterprise agreement sits on top of that. The choice of leave type is not always the employer's to make — and the consequences of getting it wrong can include underpayment claims and NES breaches.
The decision usually turns on two factors: whether paid personal/carer's leave is still available, and whether the classification is genuinely agreed or unilaterally imposed.
What determines the correct leave type
Whether paid personal/carer's leave is still available
Under the NES, full-time employees accrue 10 days of paid personal/carer's leave per year; part-timers accrue it on a pro-rata basis. Casual employees are not entitled to any paid sick and carer's leave under the NES.
While that balance exists, the leave is the correct entitlement to use for genuine illness or injury. You cannot direct the employee to take annual leave instead. Doing so unilaterally misclassifies the absence and may constitute an NES breach even if the payroll numbers look identical on the day — because the employee's sick leave balance is a continuing entitlement.
Once the balance is exhausted, the picture changes. At that point, annual leave by genuine mutual agreement becomes a practical option. So does unpaid carer's leave: the NES provides two days of unpaid carer's leave per occasion for all employees (including casuals and those who have exhausted their paid balance) when a family or household member needs care due to illness, injury, or unexpected emergency.
Quick summary by scenario:
- Paid sick leave available → employee takes paid personal/carer's leave; you cannot redirect to annual leave
- Paid sick leave exhausted → annual leave by agreement is an option; unpaid carer's leave (2 days per occasion) is an NES fallback
- Casual employee (no paid sick leave) → unpaid carer's leave per occasion; annual leave only if accrued under an award or agreement (most casuals don't accrue it)
Whether the classification is genuinely agreed or directed
"Mutual agreement" is not the same as "the employer suggested it and the employee did not object". The employee must genuinely choose to use annual leave rather than feel pressured into it. This distinction matters most when the employee still has paid sick leave — if they request to use annual leave instead and you process it as annual leave, that is their choice to make. If you require it, you are in breach.
There are limited circumstances where you can direct an employee to take annual leave. These are entirely separate from the sick leave question:
- Excessive accrued balance: Under most modern awards, you can direct an employee to take annual leave if their balance exceeds 8 weeks (10 weeks for shiftworkers), provided the direction does not reduce their balance below 6 weeks and you give the notice period required by the applicable award. This power cannot be used to override a legitimate sick day.
- Temporary shutdown: If your award or enterprise agreement allows it, you can direct employees to take annual leave during a shut-down period, with at least 28 days' written notice in most cases. Again, this is a scheduling tool, not a leave classification tool.
Neither of these directions converts a genuine sick day into annual leave. They only operate to time when accrued annual leave is taken.
The pay difference — and why it matters
Sick leave and annual leave are paid differently, and the difference can be material:
| Leave type | Rate | Leave loading |
|---|---|---|
| Paid personal/carer's leave | Base rate of pay for ordinary hours | No loading |
| Annual leave | Base rate of pay for ordinary hours | Applicable if the award or enterprise agreement provides it |
Annual leave loading (where it applies under an award) is typically 17.5% on top of the base rate. That means misclassifying annual leave as sick leave (or vice versa) can underpay the employee if loading would otherwise apply. Keep your payroll system coded to the correct leave type.
Whether illness interrupts an approved annual leave period
If an employee falls ill during a period of approved annual leave, they can access their paid sick and carer's leave for those days — and the corresponding annual leave days are re-credited. The Fair Work Ombudsman confirms that the amount of sick leave taken is deducted from the sick and carer's leave balance, with the annual leave balance restored for the same period.
This entitlement applies while the employee still has a paid sick leave balance. It does not apply where sick leave is exhausted. Your policy should set out what evidence is required and how the re-credit request is to be made, so the process is clear before anyone is lying sick in a hotel.
Your evidence position
Employers can require employees to provide reasonable evidence that they were unfit for work before you process paid sick leave. Reasonable evidence commonly means a medical certificate or statutory declaration. Employers can ask for evidence for absences as short as one day — there is no minimum duration threshold in the NES, though some awards impose one. Whatever trigger you use (for example, certificates required for absences of two or more consecutive days, or for absences immediately before or after a public holiday), apply it consistently. Inconsistent enforcement creates discrimination risk and undermines the policy.
For re-crediting annual leave that was interrupted by illness, ask for the same standard of evidence you'd require for a standalone sick day.
Leave decisions by scenario
The practical pattern across most Australian small-to-medium businesses looks like this:
Paid sick leave available — clear case: The employee has personal/carer's leave in their balance. They are genuinely unfit for work. They take paid sick leave. No employer direction required, no agreement needed. Process it correctly in your payroll system, request evidence if your policy triggers it, and keep records.
Paid sick leave exhausted — negotiated outcome: The employee has no sick leave left. You have three realistic options: annual leave by genuine agreement (maintains income, draws down the annual leave balance), unpaid carer's leave for up to 2 days per occasion under the NES, or leave without pay for longer absences if the employee has no other entitlement and you agree to it. There is no single "correct" answer — the right choice depends on the employee's situation, their leave balances, your operational needs, and what your award or enterprise agreement allows. Document whatever you agree on.
Illness during annual leave — re-credit applies: The employee provides evidence that they were genuinely ill during a booked holiday. You re-credit the annual leave days and debit the equivalent from their sick leave balance (provided it exists). If their sick leave is already exhausted, the re-credit does not apply — the annual leave stands.
Casual employee unwell: No paid sick leave entitlement under the NES. Annual leave accrues only under some awards for casual employees — many casuals simply do not have it. The practical reality is often unpaid time off, or the casual does not pick up shifts. Check your award carefully before making any promises about casual leave entitlements.
Where Artificer Legal can help
The above framework describes the NES floor. What sits on top of it — awards, enterprise agreements, individual employment contracts — is where the complexity accumulates, and where errors tend to happen.
An Artificer Legal practitioner can help you in several ways:
- Identify your applicable award or enterprise agreement and map out how its leave provisions interact with the NES, including any specific rules on directing annual leave, shutdown periods, or evidence requirements that differ from the default
- Audit your employment contracts and leave policies to ensure they are consistent with each other and with the NES — contracts cannot undercut the NES, but they can and should clarify the process
- Draft or update your workplace leave policy to clearly set out evidence thresholds, re-crediting procedures, notification requirements, and the circumstances in which annual leave by agreement can substitute for exhausted sick leave
- Advise on specific situations — long-term illness, repeated absences, notice period scenarios, and other edge cases where the interaction between leave types, award obligations, and adverse action protections requires careful navigation
Applying the rules incorrectly — particularly misclassifying sick days as annual leave without genuine agreement — can result in underpayment claims, Fair Work Ombudsman inquiries, and general protections liability. Getting the framework right in advance is considerably cheaper than litigating the edge cases later.
Whether paid sick leave is still available
The single most important variable in every "annual leave or sick leave?" question is whether paid personal/carer's leave is still available. If it is, that entitlement governs — you do not have discretion to redirect the employee to annual leave, and the employee does not need to bargain for what they are already entitled to. Every other complexity in this area (re-crediting, casual entitlements, agreed substitution, directing excessive balances) only arises once that threshold question is answered.
The most common mistake employers make is treating the two leave types as interchangeable once a payroll system shows the same dollar figure on both. They are not interchangeable. Each type carries different accrual, loading, and payout consequences — and the NES separates them deliberately. A clear policy, applied consistently, is the most practical protection against getting the classification wrong in a pressured moment.
Key points this article covers:
- Full-time employees accrue 10 days of paid personal/carer's leave and 4 weeks of annual leave per year under the NES; casuals accrue neither as a base entitlement
- Where paid sick leave is available, employees take it — employers cannot unilaterally redirect to annual leave
- Where sick leave is exhausted, annual leave by genuine agreement and unpaid carer's leave (2 days per occasion under the NES) are the main options
- If an employee falls ill during approved annual leave and has sick leave available, those days can be re-credited; evidence is required
- Employers can direct annual leave in limited circumstances (excessive balances under awards; shutdowns under award or enterprise agreement) — these powers do not override a legitimate sick day
- Annual leave may attract leave loading under an award; sick leave does not — correct payroll coding matters
- Clear, consistently applied policies covering evidence requirements, notification, and re-crediting are the practical foundation for compliance