If you’re hiring your first team member (or trying to make your staffing more flexible), it’s normal to wonder whether you should bring someone on as a casual employee or a part-time employee.
The labels can sound similar, but in New Zealand they can lead to very different obligations around hours, rosters, leave, and how you manage changes at work. This 2026 update reflects the current approach businesses are taking to compliance and good record-keeping, especially around leave and “true” casual work.
Let’s break it down in plain English so you can choose the right arrangement for your business and set it up properly from day one.
Casual Vs Part-Time: What Do These Terms Actually Mean In NZ?
In NZ employment law, “casual” and “part-time” aren’t just casual words - they describe how the working relationship operates in practice.
What Is A Part-Time Employee?
A part-time employee is usually a permanent employee (unless they’re on a fixed-term agreement) who works less than full-time hours.
The key idea is that part-time work is still typically ongoing and regular, for example:
- 3 days per week, every week
- 20 hours per week with set start/finish times
- School-hours shifts that happen each term
Part-time employees generally have an agreed pattern of work and an expectation that work will be available according to that pattern (even if the exact roster changes week to week).
What Is A Casual Employee?
A casual employee is someone you engage only when needed, with no guaranteed ongoing work. There’s typically no firm commitment from:
- you (the employer) to provide regular hours, or
- the employee to accept every shift offered.
Common casual scenarios include:
- bringing someone in to cover sick leave at short notice
- busy-season or event-based staffing (e.g. markets, functions)
- “on-call” style work where shifts vary and aren’t guaranteed
It’s worth noting: you can’t make a role “casual” just by calling it casual. If the work becomes regular and predictable over time, the arrangement may start looking more like part-time employment (with the entitlements and expectations that come with it).
Whatever you decide, it’s important the arrangement is clearly documented in an Employment Contract so everyone is on the same page.
The Biggest Differences Between Casual And Part-Time Employees
If you want the quick comparison, these are usually the big dividing lines.
1) Guaranteed Hours And Ongoing Work
Part-time employees generally have:
- ongoing employment
- an agreed set of hours (or at least a predictable minimum)
- an expectation of continuing work unless the job legitimately ends (e.g. resignation, redundancy, lawful termination)
Casual employees generally have:
- no guaranteed hours
- shifts offered as needed
- no expectation that the next week (or even the next day) will have work available
2) Pattern Of Work (Regular Vs Irregular)
Part-time work is often regular - even if it’s a small number of hours.
Casual work is usually intermittent. A classic example is someone who works “here and there” when a business is short staffed, without a set schedule.
If your “casual” employee ends up working every Monday, Wednesday, and Friday for months, you should pause and reassess. In practice, they may be a part-time employee, regardless of the label.
3) How Easy Is It To Reduce Or Change Hours?
This is a common reason businesses choose casual arrangements - flexibility. But flexibility needs to be used correctly.
With a part-time employee, their agreed hours are part of their employment terms. If you want to reduce them because business is slow, you generally need to follow a proper process and check what the agreement allows.
Even if you have good reasons, reducing hours can create risk if it’s done without consultation. If you’re considering changes, it helps to understand the right process around Reducing Staff Hours.
With a casual employee, because there are no guaranteed hours, you’re generally not “reducing” hours in the same way - you’re simply not offering shifts when they’re not required. But again, that only works if the role is truly casual.
4) Notice Of Ending Employment
Part-time employees are ongoing employees, so endings usually involve:
- resignation with notice (per the contract), or
- termination with notice (and a fair process), or
- redundancy following consultation.
Casual employment can be more complicated than people assume. While casuals might work shift-to-shift, they are still employees, and you still need to comply with the contract and act in good faith.
In either scenario, having clear clauses about notice, shift cancellation, and how rosters work is crucial.
Pay And Leave Entitlements: What Changes Between Casual And Part-Time?
This is where many business owners get caught out - because the entitlements can be similar in theory, but the way you administer them can differ a lot in practice.
Minimum Pay And Record-Keeping Still Apply
Whether someone is casual or part-time, you still need to comply with core employment obligations, including:
- the Minimum Wage Act 1983 (pay at least the applicable minimum wage)
- the Wages Protection Act 1983 (lawful deductions and correct payment practices)
- the Employment Relations Act 2000 (good faith, fair dealing, and proper processes)
- the Health and Safety at Work Act 2015 (provide a safe workplace, training, and supervision)
Annual Holidays (Annual Leave)
Under the Holidays Act 2003, employees generally become entitled to 4 weeks’ annual holidays after completing 12 months of continuous employment.
Part-time employees still get 4 weeks - it’s just calculated based on their ordinary working week. For example, if someone works 3 days a week, their “week” of annual leave is typically 3 days.
Casual employees can also become entitled to annual leave if they meet the requirements. However, many genuine casual arrangements use “pay-as-you-go” holiday pay (often 8% of gross earnings) paid with their wages, if it meets the legal criteria and is properly recorded.
Because the detail matters here (and mistakes can get expensive), it’s smart to get advice if you’re unsure whether your casual team should be accruing leave or receiving pay-as-you-go. This topic often overlaps with Casual Workers Leave Entitlements.
Sick Leave And Bereavement Leave
Sick leave and bereavement leave eligibility depends on whether the employee meets the legal tests for entitlement (including meeting minimum work pattern requirements over time).
This means a casual employee can become entitled to sick leave if they end up working consistently enough - another reason it’s important not to treat “casual” as a loophole for avoiding leave obligations.
Public Holidays
Public holiday entitlements can be tricky for both casual and part-time employees because the law looks at whether the day would “otherwise be a working day” for that employee.
For part-time employees with a regular schedule, it’s usually straightforward: if they normally work that day, it’s a public holiday entitlement day for them.
For casual employees with irregular patterns, you often need to look at the employee’s work patterns and whether they would have worked that day. This is another area where clear rosters and time records really matter.
Alternative Holidays And Time Off In Lieu
If someone works on a public holiday that would otherwise be a working day, they may be entitled to an alternative holiday (a day off in lieu) and must be paid at least time-and-a-half.
Businesses sometimes confuse “time off in lieu” for overtime with alternative holidays for public holidays. If you’re managing flexible working arrangements, it helps to understand how Time Off In Lieu is usually structured in a compliant way.
Rosters, Availability, And “True Casual” Work (Where Businesses Often Slip Up)
In practice, the biggest risk isn’t choosing casual vs part-time - it’s choosing one and running the relationship like the other.
Casual Doesn’t Mean “Always Available”
A common mistake is treating casual employees like they’re permanently on standby, for example:
- expecting them to keep every Friday night free “just in case”
- penalising them (formally or informally) for declining shifts
- giving them a predictable roster weeks in advance, every week, for long periods
That kind of arrangement can start to look like ongoing part-time employment - which can create disputes about entitlements, notice, and whether the employee should have been treated as permanent.
Part-Time Can Still Be Flexible (If You Draft It Right)
If you want reliability but still need some flexibility, part-time employment can still work well - as long as the contract is drafted to match how you actually operate.
For example, you might set:
- a minimum number of weekly hours (so the employee has certainty)
- an availability window (so you can roster within business needs)
- reasonable notice periods for roster changes
- clear rules around extra shifts and overtime
This is where having the right type of agreement matters. A generic template often won’t reflect the reality of your workplace - and that’s when misunderstandings (and Employment Relations Authority claims) can pop up.
If you’re hiring someone ongoing on reduced hours, a tailored Employment Contract can make the expectations around hours, availability, and overtime much clearer.
What If Your “Casual” Employee Becomes Regular?
It can happen gradually: you hire someone casually, they pick up more shifts, and suddenly they’re working every week.
When that happens, it’s worth reviewing whether you should move them to a part-time arrangement (or at least update the agreement). Many businesses also face this issue when transitioning staff in the other direction, like Changing From Full-Time To Casual after a role changes.
The key is consistency between:
- what the contract says
- what happens in real life (rosters, expectations, communications)
- what you pay and record in payroll.
How To Choose The Right Type Of Employee For Your Business
If you’re not sure which is best, the decision usually comes down to one question:
Do you need certainty (for you and the employee), or do you genuinely need shift-by-shift flexibility?
Casual Employment Often Works Best When…
- your staffing needs are truly unpredictable (e.g. events, weather-based demand)
- you need last-minute cover, but not on a regular schedule
- you can’t realistically promise ongoing hours
- the employee is genuinely free to accept or decline shifts
Part-Time Employment Often Works Best When…
- you need consistent coverage (even if it’s only 10–25 hours a week)
- you want to invest in training and retention
- the role involves ongoing responsibilities (opening/closing, keyholder duties, customer relationships)
- you want clearer performance management and rostering expectations
Don’t Forget: You Can Also Use Fixed-Term (But Only If It’s Genuine)
Some businesses consider fixed-term agreements instead of casual. A fixed-term can be useful for genuine short-term needs (like parental leave cover or a seasonal contract), but it must meet legal requirements and be properly justified in writing.
If your situation is more complex than “ongoing part-time” vs “ad hoc casual,” it’s worth getting advice so you don’t accidentally set up the wrong structure.
Key Takeaways
- Part-time employees are usually ongoing employees who work fewer than full-time hours, often with regular or predictable work patterns.
- Casual employees are generally engaged on an as-needed basis, with no guaranteed hours and no expectation of ongoing work.
- You can’t rely on the label alone - if a “casual” employee starts working regular, predictable hours, the relationship may look like part-time employment in practice.
- Both casual and part-time employees are covered by NZ employment law, including the Employment Relations Act 2000, the Holidays Act 2003, and health and safety obligations.
- Leave entitlements can apply to casual employees too, especially where their work becomes consistent over time or they meet the eligibility thresholds.
- The safest way to avoid disputes is to document hours, availability, rostering rules, and leave/pay calculations clearly in a properly drafted employment agreement.
If you’d like help choosing the right employment arrangement (or updating your employment agreements so they match how your business actually runs), you can reach us at 0800 002 184 or team@sprintlaw.co.nz for a free, no-obligations chat.
