Nobody resigns over one bad week. They resign after 6 months of running on empty, and then the bill arrives.
When a good person hands in their notice, the conversation usually turns to salary, progression or the offer they couldn’t refuse. Sometimes that’s the whole story. Often it’s the last chapter of a longer one about exhaustion.
What it costs.
Deloitte puts the cost of poor mental health to UK employers at £50.6bn a year. Turnover accounts for £19.5bn of it. Spread across the UK’s 30.2 million payrolled employees, that’s £646 per person, per year, before anyone has even left your organisation in particular.
For a team of 100, that’s £64,600 a year. For 250 people, £161,500.
At the level of a single departure, the government’s Keep Britain Working review puts the cost of replacing someone lost to ill health at more than £11,000. That covers recruitment, onboarding and the months a new starter needs to get up to speed. It doesn’t cover what walks out of the door with them: the client relationships, the knowledge of where things are buried, the colleague everyone went to for help.
Who is leaving, and why.
The pressure is near universal. Mental Health UK’s Burnout Report 2026 found 91% of UK adults had experienced high or extreme pressure in the past year, and 1 in 5 workers took time off for stress-related poor mental health. Among 18 to 24 year olds it was 39%. These are your future managers.
What happens when they come back matters as much. 27% of people returning after stress-related absence got no support at all. A return that feels like being dropped back into the deep end is often where the job search quietly begins.
And the pressure to stay reachable has a price of its own. More than 5 million UK workers told Totaljobs they have left a job because of the pressure to work during their annual leave.
Burnout is a workplace issue.
The World Health Organization describes burnout as an occupational phenomenon: the result of chronic workplace stress that hasn’t been successfully managed. It doesn’t classify it as a medical condition. That matters, because it places the cause in how work is set up, which is something an employer can change.
The managers in the middle are especially exposed. Gallup found global manager engagement fell from 31% in 2022 to 22% in 2025. When the people responsible for holding a team together are running lowest, everyone below them feels it.
Retention is a regulation question.
Pay rises and perks can buy time. They rarely fix a team that’s been running on adrenaline since the last reorganisation. What keeps people is the feeling that the work is sustainable: that there will be a Thursday afternoon when they can think straight.
That comes from 2 places.
How the work is set up. Heavy workloads are the top cause of stress-related absence, cited by 41% of organisations that report it (CIPD, 2025). Realistic demands, clear roles and managers who notice capacity as well as output all reduce the load.
The state people are in when they meet it. A regulated nervous system handles pressure, recovers from it and comes back the next day. Breath is the most direct lever on that state anyone has. Slow breathing, around 6 breaths a minute, is linked to more parasympathetic activity and lower anxiety. It’s trainable, quick and works in the flow of a working day.
Turnover is the most visible part of the cost of dysregulation. Here’s the part nobody sees.
The Working Well assessment shows you where your organisation sits and what dysregulation is likely costing you. Your Working Well briefing, with the full cost model, follows by email.
Take the Working Well assessment today. workerbe.co.uk/working-well
Sources
Deloitte UK, Mental health and employers, May 2024; per-employee figures derived by Worker Be with ONS (2026)
