Presenteeism is the line item nobody budgets for

Absence has a record. Somebody knows when a person is not at work. There is a form, a line in the payroll system, a conversation with a manager. Presenteeism has none of that. The person is there. The chair is occupied. The laptop is open.

That is why it is so expensive. Deloitte's 2024 research puts the total cost of poor mental health to UK employers at £51bn a year, and identifies presenteeism as the largest single component at around £24bn. Not absence. Not turnover. The cost of people being at work while running at half capacity, for months, without anyone recording it.

Why it stays invisible

Because it looks like commitment. The person who answers emails at eleven at night, who never takes a sick day, who is always available, is usually read as reliable. They may also be the person whose work is taking twice as long, whose judgement is slipping, and who is three months from leaving.

Presenteeism has no invoice. It shows up in the quality of decisions, the length of meetings, the number of things that get remade. None of that appears in a wellbeing dashboard. All of it appears in the P&L, spread thinly enough that nobody attributes it to the cause.

The arithmetic

Take an organisation of 250 people with an average salary of £38,000. A payroll of £9.5m. Deloitte's presenteeism figure is equivalent to roughly 2.2% of payroll, which for this organisation is around £209,000 a year. Add stress-related absence at 2.8 days per person and the total passes £360,000.

That estimate excludes turnover, replacement costs and the knowledge that walks out of the door with the people who leave. It is deliberately conservative. You can test the numbers for your own organisation with the calculator on our home page.

Three drivers

Exhaustion. Not the end-of-quarter tiredness that a weekend fixes, but the accumulated fatigue of a role that never quite stops. The body adapts for a while. Then it stops adapting, and the person starts making the kind of mistakes that are expensive and hard to explain.

Disengagement. The quiet withdrawal described in our essay on the quiet resignation. The person is present, compliant and no longer invested. They will not tell you, because the cost of telling you has been assessed and found too high.

Unresolved conflict. The meeting that is too polite. The colleague nobody challenges. The decision that gets remade every month because the real disagreement was never had. Conflict that cannot be named becomes a tax on everyone's attention.

What to measure instead

If presenteeism is an operating problem, it needs operating metrics. Four are worth watching.

Decision latency. How long does it take to make a decision that should be straightforward? A lengthening average is an early sign that the room is avoiding something.

Rework. How often does work come back? Not because the brief was unclear, but because the people doing it did not have the capacity to get it right first time.

Voluntary contribution. Who is still offering ideas that are not in their job description? A decline is easier to see than a mood.

Turnover intent. Not leavers, but the people who have started looking. Ask directly, and make it safe to answer.

What to do about it

Treat it as a load problem before a wellbeing problem. In practice that means three things: removing work that does not need to be done, giving people authority to match their responsibility, and making the difficult conversation possible before it becomes a resignation.

It also means being honest about the trade. A wellbeing programme that sits alongside an impossible workload is not support. It is a way of helping people tolerate something that should be changed. Employees tend to notice the difference, even when the programme is well intentioned.

The uncomfortable conclusion

The most expensive people in many organisations are the ones who never take a day off. They are also the hardest to help, because the problem does not look like a problem. It looks like loyalty.

The good news is that presenteeism responds to the same things that prevent burnout: a manageable load, a manager who notices, and a team that can say the difficult thing out loud. None of that requires a new platform. It requires attention, and the willingness to act on what the attention reveals.