NZ Mondayisation Rules: Which Holidays Move and Why

Mondayisation is one of those rules that most people think they understand — until they try to apply it to a roster that includes weekend workers, or until Christmas Day and Boxing Day both fall on a weekend and the cascade logic kicks in.

The basic idea is simple: when certain public holidays fall on a Saturday or Sunday, they transfer to the following Monday so that Monday-to-Friday workers do not lose a day off. But the detail is where the errors happen — which holidays can move, what happens when two move at once, and why weekend workers do not get two public holidays for one mondayised date.

For the full 2026 calendar including regional anniversaries, see our NZ Public Holidays 2026 guide.

Quick Reference: 2026 Mondayisation Status

In 2026, two holidays are mondayised: ANZAC Day and Boxing Day.

Which Holidays Can Be Mondayised — and Which Cannot

Only six national public holidays are subject to mondayisation:

• New Year's Day (1 January)
• Day after New Year's Day (2 January)
• Waitangi Day (6 February)
• ANZAC Day (25 April)
• Christmas Day (25 December)
• Boxing Day (26 December)

The other five national holidays — Good Friday, Easter Monday, King's Birthday, Matariki, and Labour Day — are defined to always fall on weekdays, so the question never arises.

Regional anniversary days are not subject to mondayisation. They follow a separate historical convention (typically observed on the nearest Monday to the actual anniversary date), which is a different system entirely.

This came into effect in two stages. The Holidays Act 2003 introduced mondayisation for the Christmas/New Year holidays. The 2013 amendment extended it to Waitangi Day and ANZAC Day from 2014 onwards — before that, if either fell on a weekend, workers received no substitute day.

The Traps

Trap 1: Weekend workers do not get two public holidays

This is the most common mondayisation error. When ANZAC Day falls on Saturday and is mondayised to Monday, some employers assume a Saturday worker gets a public holiday entitlement on Saturday and Monday. They do not.

Each mondayised holiday generates one public holiday entitlement. Which date it falls on depends on the individual employee:

• If the calendar date (Saturday 25 April) is an otherwise working day for the employee, their entitlement applies on Saturday
• If the mondayised date (Monday 27 April) is an otherwise working day for the employee, their entitlement applies on Monday
• If both days are otherwise working days, the employee still gets only one public holiday — on the calendar date

An employee who works on their public holiday date gets time and a half plus an alternative holiday. An employee who does not work gets paid as normal. But there is no scenario where one mondayised holiday produces two public holiday entitlements.

Trap 2: The ANZAC Day date split — trading restrictions vs employment entitlements

In 2026, ANZAC Day falls on Saturday 25 April and is mondayised to Monday 27 April. But the Shop Trading Hours Act restriction — shops must remain closed until 1:00 pm — applies on 25 April, not the mondayised Monday.

This means two different dates matter for two different purposes:

• 25 April: trading restriction day (shops closed until 1 pm)
• 27 April: public holiday for employment entitlements and working day calculations (for Monday-to-Friday workers)

Roster managers who treat 25 April as both the trading restriction day and the payroll public holiday will get one of them wrong.

Trap 3: The Christmas/New Year cascade — when Monday is already taken

The mondayisation rules include a cascade: if the Monday is already occupied by another mondayised holiday, the second holiday moves to Tuesday. This matters most during the Christmas/New Year cluster, where four mondayisable holidays sit within eight calendar days.

How the cascade works:

When Christmas Day falls on Saturday and Boxing Day falls on Sunday:

• Christmas Day → Monday 27 December
• Boxing Day → Monday is taken → Tuesday 28 December

When New Year's Day falls on Sunday and Day after New Year's falls on Monday:

• New Year's Day → Monday 2 January (but that is already the Day after New Year's)
• Day after New Year's → Tuesday 3 January (bumped to make room)

In the worst case — both pairs overlapping — the cascade can produce four consecutive mondayised days (Monday through Thursday). This does not happen in 2026, where only Boxing Day needs mondayising in December, but it is worth knowing for years when the calendar is less cooperative.

Trap 4: An employer cannot simply require work on a mondayised holiday

An employer can require an employee to work on a public holiday only if:

• the day falls on a day the employee would otherwise work, and
• the employment agreement provides for it

If the mondayised Monday falls outside the employee's agreed or guaranteed hours, an availability clause may be needed. The requirement to work cannot come from the roster alone if the agreement does not support it.

If the employee does work, they are entitled to time and a half plus an alternative holiday (if it is an otherwise working day for them).

Trap 5: Public holidays during annual leave do not consume leave — but they do not generate an alternative holiday either

If a mondayised public holiday falls while an employee is on annual leave, the day is treated as a public holiday. It is not deducted from the employee's annual leave balance — they receive public holiday pay instead.

But an alternative holiday arises only if the employee actually works on the public holiday. Being on annual leave during a public holiday preserves the leave balance but does not create an additional day off.

Frequently Asked Questions

Q: What if I normally work weekends?

A: You receive one public holiday entitlement per mondayised holiday, not two. If the calendar date is an otherwise working day for you, your entitlement applies on that day. If only the mondayised Monday is an otherwise working day for you, it applies on the Monday. Consult Employment New Zealand for specific situations.

Q: Can my employer require me to work on a mondayised holiday?

A: Only if the day falls on a day you would otherwise work and your employment agreement provides for it. If the day falls outside agreed or guaranteed hours, an availability clause may be needed. If you do work, you are entitled to time and a half, plus an alternative holiday if it is an otherwise working day for you.

Q: What happens if I'm on annual leave during a mondayised holiday?

A: The day is treated as a public holiday and is not deducted from your annual leave balance. You receive public holiday pay for the day. An alternative holiday arises only if you actually work on the public holiday — not simply because it falls during your leave.

Q: Are regional anniversary days mondayised?

A: No. Regional anniversary days follow their own observance conventions — typically observed on the nearest Monday to the actual anniversary date. This is a separate system from the statutory mondayisation rules that apply to the six national holidays listed above.

Q: What about casual or part-time workers?

A: Mondayisation applies to all employees. If you would normally work the mondayised day, it is an otherwise working day for you and you are entitled to the public holiday. Your pay is proportional to your regular daily rate.

Sources & Further Reading

• Holidays Act 2003
• When a public holiday falls on a weekend — Employment New Zealand
• Public Holidays — Employment New Zealand (MBIE)
• Holidays (Full Recognition of Waitangi Day and ANZAC Day) Amendment Act 2013
• Shop Trading Hours Act 1990 — ANZAC Day restrictions

This guide is for general information only and does not constitute legal or employment advice. For specific entitlement questions, contact Employment New Zealand or a qualified employment lawyer.