The real cost of an untrained employee: what organisations fail to measure
The cost of an untrained employee is not limited to visible errors. It includes chronic under-productivity (estimated at 10% to 20% of time according to engagement studies), the cost of errors and rework, increased likelihood of voluntary departure (employees who receive no training are 30% to 60% more likely to leave the company), and replacement cost (estimated at 50% to 200% of annual salary depending on role).
Why this cost remains invisible
Corporate accounting easily records training costs: tuition fees, trainer costs, salary cost of hours not worked. These costs are visible, budgeted and often challenged when budgets tighten.
The costs of not training, by contrast, have no accounting line. They hide in other categories: quality costs (rework, scrap, customer complaints), HR costs (recruitment, onboarding), operational costs (extended lead times, dependence on internal experts).
This accounting asymmetry creates a systematic bias in budget decisions: training cost is certain and immediate, the cost of not training is diffuse and delayed. Decision-makers rationally cut the visible cost.
The five components of the cost of not training
Chronic under-productivity. An employee without adequate skills for their role works more slowly, produces lower-quality outputs, and draws more heavily on colleagues and managers. Engagement studies (Gallop, 2024) estimate that employees who feel insufficiently equipped for their tasks have engagement 20% to 40% lower than those who feel competent.
Cost of errors and rework. In sectors with strong quality constraints (manufacturing, healthcare, finance, legal), the cost of an error caused by lack of training can far exceed the cost of the training that would have prevented it. The cost of fixing a software bug is on average 10 times higher if detected in production rather than in development. The same principle applies to most professional errors.
Accelerated turnover. Several meta-analyses have established a negative correlation between training investment and voluntary turnover. Employees who are not developing are more likely to look elsewhere. Replacement cost is estimated at 50% to 200% of annual salary depending on role, including recruitment, onboarding and ramp-up.
Loss of agility. Teams whose skills are not maintained cannot adapt to new tools, regulations or market demands without external hiring, which is slower and more expensive.
Compliance risk. Out-of-date mandatory training exposes the organisation to fines, liability and, in regulated sectors, loss of licence to operate.
What to measure instead
Track error rates, rework, time-to-competence and retention by training status to make the hidden cost visible. Present training as risk mitigation, not just development.