Every hospital chief nursing officer knows the ritual. A new cohort of graduates arrives in the autumn. There is a welcome breakfast, an orientation week, a preceptor assigned to each new starter. Recruitment dashboards turn green.
Eighteen months later, a sizeable share of them are gone. To another hospital, to an agency, to another country, or out of nursing altogether. And the cycle starts again, with another recruitment campaign, another international hiring drive, another set of signing bonuses.
Health systems talk about the nurse shortage as if it were a drought, a simple lack of supply to be fixed by training and importing more people. Much of it is closer to a leak. And pouring more water into a leaking bucket is the most expensive way to keep it full.
The global picture is improving, unevenly
The World Health Organization’s State of the World’s Nursing 2025 report contains some genuinely good news. The global nursing workforce grew from 27.9 million in 2018 to 29.8 million in 2023. The global shortage fell from 6.2 million in 2020 to 5.8 million in 2023, and on current trends it is projected to fall to 4.1 million by 2030.
But the same report shows how that supply is distributed. About 78 per cent of the world’s nurses are concentrated in countries representing 49 per cent of the global population. Around 70 per cent of the projected 2030 shortage is concentrated in the WHO African and Eastern Mediterranean regions.
And one detail explains a great deal: one in seven nurses worldwide, and 23 per cent of nurses in high-income countries, are foreign-born.
Put those figures side by side and the shape of the problem changes. The world is not simply short of nurses. Rich countries are short of nurses who stay, and they cover the gap by drawing on countries that are short of nurses, full stop.
Recruitment has become a way to avoid fixing retention
That last figure should make richer countries uncomfortable. When a hospital cannot keep its nurses, international recruitment offers an escape valve. It fills rosters quickly and avoids confronting the working conditions that drove local staff away.
But it also exports the problem. Every nurse recruited from a country with a severe shortage is a nurse that country trained, often with public money, and now cannot use. International migration is not inherently wrong, and nurses have every right to move. Remittances matter to many families and economies, and some source countries deliberately train for export. The problem is when recruitment becomes a substitute for fixing the conditions that make domestic staff leave.
WHO member states recognised this tension as far back as 2010, when they adopted the Global Code of Practice on the International Recruitment of Health Personnel. The code is voluntary. It asks recruiting countries to avoid actively recruiting from countries facing critical shortages and to invest in their own workforce. The fact that high-income countries still rely so heavily on foreign-born nurses suggests the second half of that request has been easier to sign than to honour.
There is also a quieter cost at home. An internationally recruited nurse arrives into the same unit, with the same staffing ratios and the same rota, that pushed the previous occupant of the post out. If nothing about the job has changed, the new recruit is exposed to the same pressures, often with less local support and more to lose. Recruiting into a broken unit does not fix the unit. It refills it.
What turnover actually costs
The financial case for retention is stronger than most boards realise, because the cost of losing a nurse is spread across many budget lines.
In the United States, the 2025 NSI National Health Care Retention and RN Staffing Report, drawing on data from around 450 hospitals, found an average staff registered nurse turnover rate of 16.4 per cent in 2024, with some hospitals as low as about 5 per cent and others above 36 per cent. It put the average cost of turning over one bedside RN at US$61,110.
Those costs include advertising, recruitment, orientation, precepting time, lost productivity while a new nurse gets up to speed, and often agency or overtime cover in the meantime. A hospital losing a hundred nurses a year is spending about US$6 million to stand still.
The range matters as much as the average. Hospitals in similar markets, with similar pay, have very different turnover. That strongly suggests that a large part of retention is within management’s control.
A back-of-envelope case for the board
Take a hypothetical hospital with 1,000 bedside RNs and turnover at the NSI average of 16.4 per cent. That is 164 departures a year. At the NSI’s average replacement cost, the annual bill is roughly US$10 million, most of it invisible because it is scattered across HR, education, agency and overtime budgets.
Now suppose the hospital gets turnover down to 12 per cent, still nowhere near the best performers in the NSI data. That is 120 departures instead of 164, or 44 fewer nurses to replace. At US$61,110 each, the saving is about US$2.7 million a year.
What does US$2.7 million buy? At US salary levels it would fund a meaningful number of additional nursing posts, or protected preceptor time across every unit, or a properly staffed float pool that stops managers cancelling leave. In other words, the money a hospital saves from retention is roughly the money it would need to invest in retention. The investment largely pays for itself, and the bill for not making it is already being paid.
The numbers are rough and the NSI cost figure is an average that will not match any single hospital. But the direction is not in doubt, and most finance directors, shown this arithmetic with their own figures, stop asking whether retention is affordable and start asking why nobody put it in front of them before.
Why the leak speeds up
Turnover is not a steady drip. It feeds itself. When experienced nurses leave, the ones who remain carry heavier loads, precept more new starters and work more of the unpopular shifts. Their job gets worse, so some of them leave too. The unit becomes more junior, more reliant on agency staff who do not know its routines, and less able to support the graduates it keeps hiring. Those graduates, unsupported, leave at higher rates.
This is why the gap between a hospital at 5 per cent turnover and one at 36 per cent is so wide. They are not on the same curve at different points. They are in different equilibria. One is a stable unit that trains and keeps people. The other is a revolving door that recruitment can keep turning but cannot stop.
It also explains why modest, early action is worth more than it looks. Breaking the spiral on a high-turnover unit, by stabilising a core of experienced nurses, has knock-on effects on everyone they work beside.
What keeps nurses
The evidence and the experience of nurse leaders point to a fairly consistent set of factors, most of which are not about headline salary.
Safe staffing comes first. Nurses leave when they feel unable to give safe care, and chronic understaffing drives the turnover that causes more understaffing. Predictable schedules come a close second: last-minute shift changes and mandatory overtime do more damage than most managers appreciate, because they make it impossible to plan a life around the job.
The first year is where the leak is widest. Early-career nurses are the most likely to leave, so structured residency programmes and protected preceptor time are retention tools, not training costs. Immediate managers matter enormously too. People leave managers, not just organisations, and a charge nurse or unit manager with the time and training to support a team is one of the cheapest retention investments available.
Experienced nurses need career paths that do not require leaving the bedside: clinical ladders, specialist roles, and flexible options for those who would otherwise retire early. And every nurse needs to be listened to. Nurses who see their concerns acted on stay longer than those who feel ignored.
The strongest objection
The best counterargument is that pay really does matter, and that in a tight labour market retention programmes are no match for the agency down the road offering a much higher hourly rate. There is truth in this. A hospital paying well below its local market will lose nurses whatever it does on scheduling, and no residency programme will fix a wage that cannot cover rent near the hospital.
But the objection proves less than it seems. Agency work is attractive partly because of the money and partly because it offers control over when and where you work, which is exactly what many staff nurses lack. A hospital that offers competitive pay and genuine schedule flexibility removes much of the agency’s advantage. And pay alone cannot explain why similar hospitals in the same market post such different turnover. Pay is a floor. Above it, conditions decide.
What this means for the people who can act
For hospital chief executives and finance directors, the first step is simply to see the bill. Put turnover cost on one line in the board pack, next to agency spend, with unit-level turnover rates beside it. A number that is visible gets managed.
For chief nursing officers, the priority is to find the units where the leak is fastest and stabilise them first, rather than spreading retention money thinly across the whole organisation. First-year attrition, by unit and by preceptor, is the metric to watch.
For health ministries in high-income countries, the question is whether workforce plans count retention as seriously as training places and international recruitment targets. A plan that funds new graduate places but nothing to keep them is budgeting for the leak. For ministries in source countries, the harder task is making domestic nursing careers viable enough that emigration is a choice rather than an escape, and using bilateral agreements to recover some of the training investment when nurses do leave.
For payers and funders, the lever is what they reward. Funding formulas that treat agency staffing as a pass-through cost, while offering nothing for stable workforces, quietly subsidise the revolving door.
What to watch in the next two years
Several signals will show whether health systems are treating this as a leak or still as a drought. Watch whether the next edition of the NSI report shows first-year RN turnover falling, since that is where the damage starts. Watch how recruiting countries report against the WHO Global Code, and whether more of them sign bilateral agreements that include support for source-country training. Watch whether boards begin asking for unit-level turnover as routinely as they ask for financial variance. And watch agency spend: a hospital whose agency bill is falling while its vacancy rate holds steady is probably fixing the leak rather than papering over it.
The takeaway
Training more nurses matters, especially in the regions where shortages are worst. But for most hospitals, the fastest way to increase nursing capacity is to stop losing the nurses they already have. Every nurse who stays is one less to recruit, orient and replace, and one more experienced colleague for the next graduate.
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