Lexique RH

Turnover: Definition and Best Practices in HR

Turnover: definition, calculation formula, true cost to the organisation and effective strategies to reduce staff rotation.

Turnover: Definition and Best Practices in HR

Sommaire

6-9 months salary
Average replacement cost
10-15%
Healthy turnover rate
-30-50%
Turnover reduction with good onboarding
Manager relationship
Primary reason for resignation

Definition

Turnover, or staff rotation rate, measures workforce renewal in an organisation over a given period. Formula: (number of departures per year / average headcount) × 100. We distinguish voluntary turnover (resignations) from involuntary turnover (redundancies, probation completions).

Calculation Formula and Variations

Basic Formula: Turnover Rate (%) = (Number of Departures per Year / Average Headcount) × 100

Average Headcount = (Opening headcount + Closing headcount) / 2

Variations to Track:

  • Voluntary Turnover: resignations only (most revealing of attractiveness)
  • Early Turnover: departures in first year (reveals recruitment/onboarding issues)
  • Regrettable Attrition Rate: departures of high performers you wanted to retain
  • Turnover by Department: identifies localised tension areas

Sector Benchmarks

Turnover Rates by Sector in the UK

SectorAverage RateAlert SignalComment
Public Administration5-8%> 12%Strong stability, comparison challenging
Banking / Insurance8-12%> 18%Competitive market but retentive
Manufacturing / Industry10-15%> 20%Benchmark for many SMEs
B2B Services / IT12-18%> 25%Tight market, talent wars
Retail / Distribution20-30%> 40%Structurally high
Hospitality / Accommodation25-40%> 50%Highest of all sectors
Call Centres20-30%> 40%High strain, structural turnover

True Cost of Turnover for an SME

Direct Costs vs Indirect Costs of Turnover

Avantages
  • Recruitment expenses: adverts, agencies, interviews
  • Administrative costs: contract termination, final payment
  • Replacement training: time, materials, support
  • Vacancy period: overtime, temporary staff
Inconvénients
  • Productivity loss during 3-6 months learning period
  • Knowledge loss: know-how, customer relationships
  • Team impact: overload, morale drop
  • Client impact: risk of contract loss
  • Employer brand damage, reduced attractiveness

True Cost Often Underestimated

Total replacement cost represents 6-9 months salary for a standard employee, potentially 12-18 months for managers or experts. For a 50-person SME with 15% turnover, that is 7-8 departures annually and potential annual cost of several hundred thousand pounds.

Strategies to Reduce Turnover

  1. 1

    Improve Recruitment

    Poor recruitment is the primary turnover cause. Scorecards, culture fit evaluation, systematic reference checks: successful recruitment starts with rigorous selection.

  2. 2

    Optimise Onboarding

    The first 90 days are critical. Progressive integration journey, buddy system, regular check-ins. Good onboarding cuts early turnover by 30-50%.

  3. 3

    Develop Management Quality

    Primary resignation reason: manager relationship. Train managers in regular feedback, recognition and delegation. A good manager is your best retention lever.

  4. 4

    Offer Progression Opportunities

    Staff with no progression path leave. Clear career paths, internal mobility, continuous learning. In SMEs, progression can be horizontal (expanded responsibilities) as well as vertical.

  5. 5

    Analyse Departure Reasons

    Systematise exit interviews. Identify patterns: particular department? Manager? Period? Run stay interviews to act before departures.

Frequently Asked Questions about Turnover

What is an acceptable turnover rate for an SME?
There is no universal figure: sector matters greatly. 10-15% is generally healthy in most industrial and service sectors. Below 5% risks insufficient renewal and innovation. Above 20% in low-turnover sectors signals likely management or working conditions issues. Always benchmark against your sector.
Is turnover always negative?
No, some turnover is desirable. Functional turnover (departure of underperformers) can be beneficial, renewing teams and bringing fresh skills and perspectives. Dysfunctional turnover (loss of high performers) is problematic. The goal is not zero turnover, but minimising regrettable departures while accepting healthy renewal.
How to distinguish voluntary and involuntary turnover in my figures?
Categorise each departure when contract ends: resignation (voluntary), redundancy for conduct or business reasons (involuntary), probation completion (separate — often signals recruitment issue), fixed-term end (predictable). Track each category separately for targeted corrective actions. Voluntary turnover is most concerning for retention. Involuntary signals recruitment and assessment quality issues.
How to reduce turnover costs without raising salaries?
Salary is one factor among many in stay/leave decisions. Under-leveraged non-salary levers: work flexibility (remote, hours), management quality (primary factor), recognition (high impact, negligible cost), progression opportunities (training, interesting projects), team relationships and belonging. Invest in these first before resorting to spot pay increases that don't address root causes.
Should probation completions be included in turnover?
Yes, probation completions are real costs and should be counted. Create a specific 'probation failure rate' to track separately. Failure rates over 10% typically reveal recruitment process (poor evaluation) or onboarding issues (inadequate support). Analyse separately from general turnover to target improvements precisely.

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