Why Leadership Development Is Important (And What It Costs to Skip It)

Why leadership development is important: the manager is the variable

That is the argument you take into the budget meeting.

Most leadership development proposals stall because they’re pitched as a benefit, something nice you do when the year goes well. Pitched that way, it loses to any other line item. Pitched as a cost you are already paying, it wins.

This post is the numbers half of the case. For the build, see our companion guide on how to build a leadership development program, and our overview of training and development in HR for the wider picture.

Leadership development statistics at a glance

Every figure traces to a named, dated study. Bring the table, not the adjectives.

Figure	What it measures	Source
70%	Variance in team engagement Gallup attributes to the manager	Gallup, Manager Development Strategy (updated Feb. 2026)
23%	Higher profitability, top-quartile vs. bottom-quartile engagement units	Gallup, Q12 Meta-Analysis, 11th Ed. (May 2024)
51%	Lower turnover at low-turnover employers, same comparison (21% at high-turnover employers)	Gallup, Q12 Meta-Analysis, 11th Ed. (May 2024)
78%	Lower absenteeism, same comparison	Gallup, Q12 Meta-Analysis, 11th Ed. (May 2024)
200%	Salary cost of replacing a leader or manager	Gallup, 42% of Employee Turnover Is Preventable (2024)
42%	Of voluntary exits the departing employee calls preventable	Gallup, 42% of Employee Turnover Is Preventable (2024)
22%	Managers engaged worldwide in 2025, down from 31% in 2022	Gallup, State of the Global Workplace 2026 (Apr. 2026)
20%	HR leaders with successors ready for their most critical roles	DDI, Global Leadership Forecast 2025 (Jan. 2025)
2.8X	Financial outperformance of employers with strong leadership benches	DDI, Global Leadership Forecast 2025 (Jan. 2025)
21%	High potentials intending to leave within a year, up from 13% in 2020	DDI, Global Leadership Forecast 2025 (Jan. 2025)
18-20%	Salary premium external hires command over internal promotions	Bidwell, Wharton, “Paying More to Get Less” (2011)
$874	Average U.S. training spend per learner in 2025, up from $774	Training Magazine, 2025 Training Industry Report (Nov. 2025)
13%	Share of the average U.S. training budget spent on leadership and management	Training Magazine, 2025 Training Industry Report (Nov. 2025)

What an untrained manager actually costs

The cost is real but never a line item, which is exactly why it survives budget season.

Gallup’s eleventh-edition Q12 meta-analysis, covering 183,806 business units across 90 countries, found top-quartile engagement units beat bottom-quartile units by 23 percent on profitability, 78 percent on absenteeism, 63 percent on safety incidents, and 32 percent on quality defects. Those are operating numbers with a manager attached.

The people holding the wheel are struggling. Manager engagement worldwide fell to 22 percent in 2025 from 31 percent in 2022, per Gallup’s State of the Global Workplace 2026 report, which prices global lost productivity at roughly $10 trillion, or 9 percent of GDP.

The effect reaches past output. In a January 2023 survey of 3,400 workers across 10 countries, the Workforce Institute at UKG found 69 percent of employees say their manager affects their mental health as much as their spouse, more than their doctor (51 percent) or therapist (41 percent).

Every untrained manager is a retention risk with direct reports attached.

The retention link, in dollars

This is the section your CFO will read.

Gallup’s 2024 study of 717 people who voluntarily quit puts the cost of replacing a leader or manager at about 200 percent of annual salary, against 80 percent for a technical professional and 40 percent for a frontline employee. On a $120,000 manager, that is roughly $240,000 out the door.

The same study found that 42 percent of those exits were preventable in the employee’s own view, that 21 percent of preventable exits traced to manager interactions, and that 45 percent of leavers had no conversation about their satisfaction, performance, or future in their final three months.

Sit with that last one. Nearly half the exits were preceded by silence. Silence is a manager skill gap, and skill gaps are trainable.

The upside prices out in the same currency. Gallup’s 2022 meta-analysis of its manager development programs found teams whose managers completed the training saw 18 percent higher engagement and 21 to 28 percent lower turnover.

What happens when you promote without developing

The default is to promote the strongest individual contributor and hope the rest sorts itself out.

It doesn’t. Only 15 percent of employees say their manager helped them build a career plan in the past six months, down five points year over year, per LinkedIn’s 2025 Workplace Learning Report. DDI found just 19 percent of managers report strong delegation skills.

Delegation and career conversations are not personality traits. They are taught. Promoting a strong technician into people leadership without teaching them is not a stretch assignment. It is an unfunded liability with a title change.

The remedy is cheap against the exposure. Single-session manager development workshops on feedback, coaching, and difficult conversations run under $400 a seat at Catapult, and pairing them with 360-degree and behavioral assessments gives a new manager a baseline instead of a guess.

The bench you have not built

Succession risk is this same problem arriving all at once.

Only 20 percent of HR leaders say they have leaders ready to fill their most critical roles, and 77 percent of CHROs are not confident in their bench strength, both from DDI’s Global Leadership Forecast 2025, a January 2025 study of 10,796 leaders across 2,014 organizations.

It compounds from both ends. DDI also found 40 percent of leaders have considered stepping away and 71 percent report rising stress, while high potentials intending to leave within the year climbed from 13 percent in 2020 to 21 percent in 2024. And the trigger is specific: high-potential talent is 3.7 times more likely to leave in the next year when their manager does not regularly provide opportunities for growth and development. Not the company. The manager.

Building the bench pays. DDI reports organizations with strong benches are 2.8 times more likely to outperform financially and 2.9 times more likely to fill leadership roles internally.

If you can’t name a successor for your top five roles with a readiness date attached, that’s the project. Catapult’s succession and workforce planning work risk-ranks critical roles and builds named plans on 12- to 24-month readiness timelines.

We can just hire experienced leaders: why the math usually fails

This objection deserves an answer, not a dismissal. Sometimes buying is right: a genuinely new capability, a turnaround, a function you have never run.

As a standing strategy, the numbers work against it.

Wharton professor Matthew Bidwell’s analysis of 2003 to 2009 personnel data, published in Administrative Science Quarterly in 2011, found external hires are paid 18 to 20 percent more than internal promotions in comparable roles, receive significantly lower performance evaluations for their first two years, and exit at higher rates in that window.

Here is the math that matters. On a $120,000 leadership role, an 18 to 20 percent premium is $21,600 to $24,000 a year in additional salary, permanently in your structure, before search fees, relocation, or a signing bonus. You pay it for two years of below-benchmark performance and elevated flight risk. If the hire does not stick, Gallup’s 200 percent replacement multiple applies to the role again.

Against that: U.S. employers average $874 per learner per year and put 13 percent of the training budget into leadership and management, per Training Magazine’s 2025 Training Industry Report, published November 2025.

One year of the external-hire premium funds a multi-year development track for several internal candidates. Hire outside when you need a capability you genuinely don’t have. Do not make it the default.

Upcoming leadership development courses

Every course below has open seats today and a page where you can pick a date and register. Pricing is member / non-member; Catapult members register at the lower rate.

Course	Next session	Member / Non-member
High Potentials: Is Supervision Right for Me?	Oct 7	$579 / $799	Register
Fundamentals of Supervision Certificate Program	Oct 14 (7 dates open)	$699 / $959	Register
Team Leader Certificate Program	Dec 3	$579 / $799	Register
Advanced Management I: Relational Leader Certificate Program	Nov 3	$699 / $959	Register
Advanced Management II: Multidimensional Leader Cert. Program	Sep 24	$699 / $959	Register
Advanced Management III: Strategic Leader Certificate Program	Dec 1	$579 / $799	Register
Being an Effective Leader	Sep 30 (2 dates open)	$269 / $339	Register

See the full leadership and management training lineup for dates further out. Seats fill quickly, especially for Fundamentals of Supervision; if the date you want isn’t open yet, the course page lists what’s coming next.

How Catapult keeps you covered

Match the tier to the gap, and pick one. First-time supervisors start with single-session manager development workshops. Managers who need behavior change rather than attendance move to multi-session leadership and management certificate programs. Senior leaders scaling or derailing get executive coaching. A thin bench gets succession and workforce planning before more training spend. For regional retention benchmarks, Catapult’s HR research publishes the Compensation Planning Survey and the Executive Compensation Survey.

An untrained manager is not a gap in the org chart. It is a replacement bill at 200 percent of salary that you have already agreed to pay, on a date you don’t get to pick.