The real cost of a bad hire is the sum of six items: initial recruitment, salary paid for underperformance, supervision time, mistakes and losses, separation costs, and finally replacement and vacancy. For a $70,000-a-year job that ends after four months, our illustrative example comes to more than $31,000, or close to half the annual salary.
That figure is not a statistic. It is a calculation based on cautious assumptions that you can redo with your own data, which is the whole point. Once you put a number on it, a bad hire stops being a rough patch and becomes a risk you can manage.
What counts as a bad hire?
A bad hire is someone who doesn't meet the expectations of the job, leaves quickly or disrupts how the team works. It isn't only about people who leave in the first few months. An employee who stays but whose performance or behaviour holds others back often costs even more, because the problem drags on.
The causes are rarely a mystery: a vague job description, an unstructured interview, rushed reference checks, a decision driven by urgency, an improvised onboarding. The good news is that each one can be fixed.
Which costs should you include in the calculation?
The table below groups direct costs, which show up in your financial statements, and indirect costs, which hide in your team's time.
| Cost item | What it includes | Where to find the data |
| 1. Initial recruitment | Advertising, agency fees, testing, interview time | Invoices, managers' calendars |
| 2. Underperformance | Share of salary paid without matching output | Payroll, goals achieved |
| 3. Supervision and training | Hours spent by the manager and peer trainers | Timesheets, estimates |
| 4. Mistakes and losses | Scrap, rework, complaints, lost customers | Quality reports, customer service |
| 5. Separation | Administrative work, any severance | Payroll, HR |
| 6. Replacement and vacancy | New recruitment, overtime, contracts turned down | Payroll, sales |
The effects on the team are real but hard to quantify: lower morale, extra workload, follow-on resignations. Don't make up numbers for them. List them separately as a reminder that your total is a floor, not a ceiling.
How do you calculate the cost of a bad hire, step by step?
- Pick a real case: a resignation or dismissal from the past two years.
- Add up initial recruitment costs: invoices plus internal hours multiplied by a realistic hourly rate.
- Estimate the missing performance: salary paid over the period × the percentage of performance not achieved.
- Count supervision hours beyond what a normal onboarding requires.
- Add measurable losses: scrap, rework, penalties, documented lost sales.
- Add separation and replacement: new recruitment and the cost of the vacancy.
- Compare the total to the annual salary to get a ratio that's easy to share with leadership.
What does a bad hire cost in a real-world example?
Illustrative example (fictional figures): a maintenance technician hired at $70,000 a year leaves after four months. Their performance is estimated at 50% of what was expected over the period. Replacing them takes eight weeks, covered by overtime.
| Cost item | Assumption | Amount |
| Initial recruitment | Advertising $1,500 + 20 interview hours at $60/h | $2,700 |
| Underperformance | 50% of 4 months' salary ($23,333) | $11,667 |
| Extra supervision | 60 manager hours at $60/h + 40 peer hours at $45/h | $5,400 |
| Mistakes and losses | Documented scrap and rework | $4,000 |
| Separation | Administrative work | $1,000 |
| Replacement | New recruitment, same assumptions | $2,700 |
| Vacancy | 8 weeks × 10 overtime hours × $52.50/h | $4,200 |
| Total | $31,667 |
The result is about 45% of the annual salary, before counting the effect on the team or any undocumented lost customers. Your own numbers will differ, but the order of magnitude is often enough to justify a better selection process.
"A hiring mistake rarely costs less than a rigorous selection process. It just gets paid later, and by more people.
Why does the cost of a vacancy push companies into bad hires?
The longer a job stays empty, the stronger the pressure to just hire someone. It's a classic trap: you compare the visible cost of waiting with the invisible cost of a mistake. The calculation above puts both on the same scale. A few extra weeks to find the right person often cost less than four months with the wrong one.
The answer isn't to slow down but to widen the pool: international recruitment, outreach to passive candidates, or support from an agency that already has an active network.
What should you do when the bad hire has already happened?
Act early. Every week of hesitation adds salary paid without output, supervision time and frustration within the team. Start with an honest conversation: expectations, the gaps you've seen, the support you'll provide and a clear deadline. If things don't improve, a respectful separation that complies with employment standards limits the damage.
Then review the hiring process without looking for someone to blame: job description, candidate sources, interviews, references, onboarding. A single well-targeted fix can prevent the next mistake.
How can you reduce the risk of a bad hire?
- Define success before you advertise: three to five expected results after six months.
- Structure your interviews: the same questions, a shared scorecard, several assessors.
- Test on the job: a work sample, practical trial or case study tied to the role.
- Check references with specific questions about achievements and behaviour.
- Invest in onboarding: a 90-day plan, a buddy, regular check-ins.
- Measure: track first-year turnover and quality of hire.
To go further, read our articles on the first 10 weeks that shape a new hire's future and the four HR metrics every small business should track.
Frequently asked questions
Is there a standard percentage for the cost of a bad hire?
Many figures circulate, but they rest on very different assumptions depending on the job and industry. The most reliable approach is to calculate your own cost from a real case, using the seven-step method above.
Are bad hires more expensive for management roles?
Generally yes, because their decisions affect more people, customers and budgets. Indirect costs, such as resignations within the team, often outweigh the salary itself.
Does a replacement guarantee cover the cost of a bad hire?
It reduces the cost of recruiting again, but not the salary paid, the supervision time or the losses. It helps, but it is no substitute for rigorous selection.
How long does it take to know if a hire is working out?
Set measurable goals for 30, 60 and 90 days. Warning signs often show up early, and regular check-ins let you correct course before the cost climbs.
Lowering your risk with Industrielle RH
Industrielle RH helps you get the hire right the first time: job definition, screening, structured interviews and reference checks, in Canada and internationally. You keep the final decision, with better-assessed candidates. Talk to our team about your next hire.