Unused Leave, Unfilled Rosters: The South Island Health Data Overseas Clinicians Should Know

News · 2026-08-31 · 5 min read

Staffing pressure in New Zealand's health system is a familiar topic. A new internal analysis from Health New Zealand's South Island region, however, goes beyond the usual call for more nurses. It describes a system that is getting by on time it does not have, where the real level of understaffing is hidden by large amounts of unused annual leave, unpaid overtime and deferred time-in-lieu.

Healthcare workers, recruiters, workforce planners and hospital managers should take note. Below, the findings are set out point by point.

Staff Numbers and Their Limits

Most coverage of workforce shortages starts with vacancies. This review takes a different angle. Its main points on headcount are:

The South Island's health workforce has fallen considerably over the past four years.
The sharpest fall came in just the last twelve months.
Health New Zealand has itself questioned how reliable the headcount figure is.

The reason for that doubt is internal restructuring. Many support and public health staff were moved from district-based payroll systems onto national ones. Some of the workers who appear to be "missing" may still be in the health system, simply recorded under a different category.

That is an important qualification. It does not, though, weaken the most telling part of the analysis, which is the leave and overtime data.

Annual Leave Piling Up

This is the figure health leaders across the country should focus on:

The average South Island health worker holds roughly three months of unused annual leave.
That is nearly twice the balance in the next-highest region.
It is more than five times the balance carried by workers in Northland.
Senior doctors hold close to five months on average, triple the national figure for their peer group.

These balances are not the result of staff choosing not to use a generous policy. They show a workforce that cannot be released long enough to take time off it has already earned. At this scale, leave stops functioning as a benefit and becomes what workforce economists describe as a deferred liability. Sooner or later the organisation must absorb that cost, through payouts, through staff leaving because of burnout, or through both.

Extra Hours as a Permanent Fix

The overtime figures follow the same pattern. Nurses in the South Island collectively hold a very large overtime balance, accounting for most of the overtime hours recorded in the region, together with a separate build-up of unclaimed time-in-lieu.

These balances have been falling since 2022. The internal analysis is clear, however, that the decline does not mean overtime is going away. It has become a standard way of covering shifts, not a short-term measure to get through a difficult period.

The difference matters. A system that depends on structural overtime is not adjusting to brief peaks in demand. It is covering a lasting staffing gap with the unpaid or deferred hours of the people it already employs.

Which Job Groups Shrank Most

The reduction was not mainly among nurses, doctors or midwives. The largest falls were in:

administrative roles;
management roles; and
patient care-and-support roles.

On paper this could look like improved efficiency. The review warns that in practice clinical staff are probably taking on coordination and support tasks that used to be handled by others, adding strain to frontline teams that are already stretched.

The pattern also varies within the region. Some districts increased their workforce over the period, while others, including some of the bigger ones, recorded genuine declines. The pressure is spread unevenly, not as one uniform shortage.

Lessons for Health Systems Elsewhere

Workforce planners regularly see this build-up of leave and overtime in health systems under long-term pressure. It works as an early warning for staffing agencies and health authorities far beyond the South Island. When staff cannot take the leave they have earned, the shortage is not something that may happen later. It is happening now, recorded in the payroll ledger rather than on the vacancy list.

For organisations that source and place healthcare professionals internationally, figures like these call for action before burnout-related departures make the shortage even worse. Recruiting overseas-trained nurses, doctors and allied health professionals is not only about filling current vacancies. It also gives a tired existing workforce space to take the leave it is owed, before accumulated fatigue leads to resignations.

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Main Conclusions

Whatever the confirmed headcount turns out to be, the leave and overtime figures are difficult to dismiss. A workforce holding three months of unused leave and relying on built-in overtime is operating beyond a sustainable level, however the organisation chart is arranged. For health system leaders and their recruitment partners, the issue is not whether the pressure exists. It is how fast new capacity can be added before deferred leave turns into a wave of resignations.

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