-23.avif)
The Real Cost of Regrettable Attrition (And Why It Starts With Your Managers)
The stat nobody puts in the board presentation: replacing a mid-level employee costs between 50% and 200% of their annual salary.
That's not a consultant's estimate. That's the consistent range across SHRM and Gallup studies of voluntary turnover. When you lose someone you wanted to keep, and you spend the next 4 to 6 months recruiting, onboarding, and ramping their replacement, you've quietly spent six figures. Sometimes more.
Now do that math across your last twelve months of regrettable attrition.
Still think this is a "people problem"?
This post is about regrettable attrition: what it is, what it actually costs, and, most importantly, why the conversation about it almost always starts in the wrong place.
What Is Regrettable Attrition?
Not all attrition is equal. When a low performer leaves, you may actually save money. When a contractor finishes their engagement, that's expected. When someone moves into a role that better fits their life stage, you wish them well.
Regrettable attrition is different. It's the people you would have promoted. The ones carrying organizational knowledge you can't replace from LinkedIn. The engineers your CTO is still talking about two years later. The sales rep who knew your product better than anyone and had relationships with your top accounts.
Regrettable attrition is defined by the cost to replace, not just in money, but in time, momentum, and the signal it sends to the team members who stay and watch.
A working benchmark used by most scaling companies: regrettable attrition should be under 10% annually. Most teams are running above that. If you've had a year of rapid growth followed by manager promotions with no training, it's probably higher than you think.
The Full Cost of Losing One High Performer
Most finance leaders see the recruitment cost. They miss the full picture.
A more complete model for what it costs when someone you wanted to keep walks out the door:
For a $100K employee, conservative estimates put total replacement cost at $50K to $75K. For a senior engineer or experienced sales leader at $150K+, you're often looking at $150K to $300K all-in. And that's for one person, one time.
If you've had five regrettable departures this year, you can do the math. The number is uncomfortable enough that most leaders would rather not.
Why Regrettable Attrition Is Mostly a Management Problem
One finding should change how you spend your L&D budget.
Gallup's research shows that managers account for at least 70% of the variance in employee engagement. Not strategy, not perks, not compensation band, managers. And regrettable attrition tracks almost perfectly with engagement. People who are engaged don't leave for marginal salary bumps. People who are disengaged do.
The exit interview data confirms this. The most common reasons people give for regrettable departures:
- The relationship with their direct manager (often cited first)
- Lack of development or growth in role
- Feeling unrecognized or undervalued
- Burnout from poor workload or expectation management
- Compensation or a competing offer
Four of the five lead back to management behaviour. Not compensation. Not benefits. The quality of the relationship between employees and the people who manage them.
This is exactly the pattern of the manager gap: companies promote their best individual contributors into management roles, give them no training, and then wonder why their best ICs are leaving. According to CMI and YouGov's 2023 study of UK managers, 82% of managers are "accidental managers" who entered the role without formal training. The pattern is UK-specific in the data, but the dynamic shows up everywhere we work.
The promoted manager doesn't know how to develop people. Doesn't know how to give meaningful recognition. Has never been taught to have a growth conversation that doesn't feel like a performance review. So their best direct reports, the ones with the most options, start looking.
The Manager Debt Connection
There's a direct line between untrained managers and regrettable attrition. We call it manager debt.
Manager debt accumulates when organizations promote without developing. It shows up as engagement decline, conflict avoidance, missed 1:1s, performance conversations that never happen, and team members whose development has effectively stalled.
The compounding cost is what makes it dangerous. An untrained manager who's struggling doesn't just lose one high performer. They erode the engagement of their entire team over 12 to 18 months. By the time the fourth or fifth departure happens, HR has a pattern. But the root cause, the untrained manager, has been in place the whole time.
The ROI of investing in leadership development is typically calculated against these downstream costs. A structured manager training program at $5K to $15K per manager often pays for itself in a single avoided regrettable departure. When you compound that across a manager population, the math gets impossible to ignore.
How to Calculate Your Regrettable Attrition Cost
A model you can run with your HRBP and finance partner.
Step 1: Define regrettable attrition. Pull your last 12 months of departures. Ask two questions for each:
- Would you rehire this person if they applied today?
- Was this departure avoidable?
"Yes" to both = regrettable. Don't be too conservative here.
Step 2: Count and segment. How many regrettable departures? At what average salary level? This gives you the raw number to apply the replacement cost formula.
Step 3: Apply the cost multiplier.
Multiply each departure by its multiplier. Sum the total.
Step 4: Add the team impact factor. This is harder to quantify but real. Teams that experience multiple regrettable departures in a 12-month period often see meaningful engagement drops in the people who stay. That's the "survivor" effect. The people who watch their best colleagues leave start asking whether they should too.
If you have a team with 3 or more regrettable departures in a year, add a meaningful engagement risk cost on top of direct replacement costs. The exact number is hard to model, but the direction is consistent: the second and third departures from the same team cost more than the first one, because they signal something the rest of the team starts to act on.
What to Actually Do About It
The problem is named. The math is done. Now what?
Fix the manager gap at its source
The highest-ROI intervention is consistent: train your managers. Not a one-day offsite. Not a book list. A structured program that gives managers the skills they're missing, how to run effective 1:1s, how to give feedback that lands, how to have development conversations, how to recognize in ways that actually feel meaningful.
The new manager training program is specifically designed for this cohort: the recent promotion who is technically excellent and people-management inexperienced. The program moves the needle on exactly the behaviours that drive engagement: development conversations, recognition, psychological safety creation.
Build "stay interviews" into your retention practice
Exit interviews tell you why people left. Stay interviews tell you why people are staying, and what would make them leave.
Ask your best people this question every six months: "What's one thing that, if it changed, would make you start exploring other options?"
The answers are usually not what you'd expect. And they give you the ability to address the concern before it becomes a resignation letter.
Fix conflict before it compounds
Unresolved team conflict is a slow driver of regrettable attrition. High performers don't leave immediately when there's a difficult team pattern, they wait, they absorb, they give the organization chances to fix it. And then they stop waiting.
The conflict resolution framework for leadership teams addresses this specifically. Early intervention on team conflict is significantly cheaper than replacing the team members who eventually leave because the conflict never got addressed.
Measure what matters before the exit interview
The exit interview is the last opportunity to learn from someone who's already decided to leave. The data is valuable, but the timing is almost too late to act on it for that person.
Build quarterly pulse checks, manager effectiveness surveys, and team dynamics assessments into your regular practice. The data you need to prevent regrettable attrition is available well before the departure, if you're measuring for it.
The CFO Conversation You Need to Have
HR leaders often make the mistake of framing leadership development as a culture investment. CFOs are not moved by culture investments. They're moved by numbers.
Reframe the conversation: you have an attrition problem with a quantifiable cost. You have an evidence-based intervention (manager training) with a predictable ROI. The cost of the intervention is approximately X. The projected reduction in regrettable attrition saves approximately Y. Y is larger than X.
The full case for pitching leadership development to a CFO covers the exact framing and data points you need. The short version: stop selling "soft skills." Start selling the hard math of what untrained managers cost.
The Pattern Doesn't Change on Its Own
If your regrettable attrition is above 10%, it won't fix itself.
Not because your people aren't good. Not because your culture isn't genuine. Because the behaviour patterns that drive attrition, untrained managers, unaddressed conflict, absent development conversations, are self-reinforcing. The managers who aren't developing their people don't know they're not developing their people. The cycle continues until you interrupt it.
The interruption is a deliberate investment in the people who run your teams. Not a perk. An infrastructure decision. The same way you invest in a new sales system or a security audit, because the cost of not doing it is measurably higher than the cost of doing it.
Run the math on your last 12 months. Then decide if leadership development is a line item or a priority.
Ready to make the business case? Read The Real ROI of Leadership Development, the framing and data HR leaders use to get CFO buy-in for manager training programs.
Frequently Asked Questions
Now that you have mastered how to manage conflict - what is your plan of action for making an impact with your team?
Now that you have mastered how to create an environment of empowerment via the 3-P's - what is your plan of action for making an impact with your team?
Developing Your Communication, Empathy and Emotional Intelligence skills is start. What is your plan of action for implementing your learnings within your your team?
Now that you understand the differences in these titles - what is your plan of action for what you learned?
Assessing your team's behaviors is a start - but do you have a plan of action for the results?
Now that you have mastered the art of decision making - what is your plan of action for making an impact with your team?
.png)
A DISC Behaviour Assessment is the best way to understand your team's personalities.
Each DISC Assessment includes a Self Assessment and DISC Style evaluation worksheet
.webp)
