Cost Accounting · Employee Costs

Labour Turnover: Formulas, Causes and Cost

Updated 10 October 2026 · Fact-checked

Labour turnover is the rate at which employees leave a firm and are replaced during a period. You measure it as a percentage of average workers using the separation, replacement or flux method. Then you add the preventable and unpreventable costs of turnover to see what it costs the business.

Understand Labour Turnover

Labour turnover is the change in the workforce of a firm during a period. People leave (separations) and new people join (accessions). The rate tells you how stable your workforce is.

A high rate is a warning sign. Every time a worker leaves, the firm loses skill, spends on hiring and training, and often suffers lower output and more wastage while the new person learns. A very low rate is not always good either. It can mean ageing staff and no fresh ideas.

There are three ways to measure it. The separation method counts only those who leave. The replacement method counts only those who are hired to replace leavers. The flux method counts both separations and all accessions, including new posts. Each uses the average number of workers as the base.

Causes fall into two groups. Avoidable (preventable) causes are those management can act on. They include low pay, poor working conditions, bad supervision, better prospects elsewhere, no promotion, job dissatisfaction and unfair treatment. Unavoidable (unpreventable) causes are beyond management control. They include retirement, death, illness, marriage, relocation, and also discharge for indiscipline, redundancy and retrenchment. Management can act only on the avoidable group.

Costs of turnover can be classified in two ways. First, by cause: preventable costs arise from avoidable leaving, such as the extra costs from poor morale and management faults, and unpreventable costs arise from causes beyond control. Second, by nature: separation costs (costs of the leaving) and replacement costs (recruitment, selection, induction, training, lower output of new staff, extra scrap and tool breakage, and overtime or idle time caused by vacancies). These are two different classifications of the same total, so do not mix them.

Key rules to remember

Average number of workers: (Workers at start + Workers at end) ÷ 2; Use this as the base unless the question gives a different average, such as monthly figures.
Separation method: Labour turnover rate = Number of separations during the period ÷ Average number of workers × 100; Separations include resignations, discharges, retirements and deaths.
Replacement method: Labour turnover rate = Number of replacements during the period ÷ Average number of workers × 100; Count only workers hired in place of those who left. New posts for expansion are not replacements.
Flux method: Labour turnover rate = (Separations + Accessions) ÷ Average number of workers × 100; Accessions include replacements and additions. Flux rate is normally higher than the other two.
Flux rate when all accessions are replacements: Flux rate = 2 × Replacements ÷ Average number of workers × 100; Valid only when every accession is a replacement and separations equal replacements. Then there are no new posts and headcount does not change.
Total cost of labour turnover: Total cost = Preventable cost + Unpreventable cost; also Total cost = Separation costs + Replacement costs; These are two separate ways of classifying the same total: by cause (preventable or unpreventable) and by nature (separation or replacement). Each cost item falls in one group under each classification.
Cost per replacement (illustrative measure): Cost per replacement = Total cost ÷ Number of replacements; This is not a standard prescribed formula. Use it only as an illustrative measure, when the question asks for an average cost per replacement.

How to solve Labour Turnover questions

Use this order for any labour turnover question, whether it asks for the rate, the cost or the remedies.

1Read the data and list opening workers, closing workers, separations, replacements and new additions separately.
2Compute the average number of workers as (opening + closing) ÷ 2 unless told otherwise.
3Identify which method the question asks for. If it asks for all three, compute each from the same average.
4Apply the formula and express the answer as a percentage. Show the working line.
5If cost is asked, list each cost item, classify it as separation or replacement cost, and total it.
6Split the total into preventable and unpreventable parts only if the data allows, such as costs due to avoidable causes.
7If asked for interpretation, state what the rate means, name the likely causes and give two or three practical remedies.
8Write the final answer with a one-line conclusion.

Quickest way: Three-number shortcut

When to use it: Use for MCQs and for the rate parts of long questions where separations, replacements and additions are given.

Find the average workers first: (opening + closing) ÷ 2.
Note S = separations, R = replacements, A = new additions beyond replacements.
Separation rate = S ÷ average × 100. Replacement rate = R ÷ average × 100.
Flux rate = (S + R + A) ÷ average × 100, since accessions are R + A.
Check that flux is at least as large as each of the other two rates. If not, recheck.

Common mistakes in Labour Turnover

Using the closing or opening workers as the base instead of the average.
The question gives both figures and students pick one in a hurry.
Fix: Always compute (opening + closing) ÷ 2 first, unless the question states another base.
Counting new posts as replacements in the replacement method.
Students treat every new joiner as a replacement.
Fix: Replacements are only those hired in place of leavers. Extra staff for expansion appear only in the flux method.
Forgetting to include both separations and accessions in the flux method.
Students confuse flux with the separation method.
Fix: Write the formula as (S + accessions) ÷ average × 100 before substituting.
Mixing avoidable and unavoidable causes when listing remedies.
Students memorise causes as one list.
Fix: Group causes into avoidable and unavoidable. Aim remedies at the avoidable group, such as low pay, poor supervision or better prospects elsewhere. Retirement, death, illness, marriage and relocation cannot be prevented by management.
Leaving out hidden costs such as lower output of new workers, scrap and idle time.
Students list only recruitment and training costs.
Fix: Use two headings, separation costs and replacement costs, and run through each item the question gives.
Giving the rate as a plain number without the percentage sign or time period.
Rushing at the end of the answer.
Fix: State the answer as a percentage for the period, for example 12.5% for the year.

Worked examples

Example 1

A factory had 480 workers at the start of the year and 520 at the end. During the year 60 workers left. 50 workers were hired in their place and 30 more were hired because of expansion. Calculate labour turnover by the separation, replacement and flux methods.

Show the solution

Average workers = (480 + 520) ÷ 2 = 500.
Separation method = 60 ÷ 500 × 100 = 12%.
Replacement method = 50 ÷ 500 × 100 = 10%.
Accessions = 50 + 30 = 80.
Flux method = (60 + 80) ÷ 500 × 100 = 140 ÷ 500 × 100 = 28%.

Answer: Separation 12%, replacement 10%, flux 28%.

Example 2

In a firm, labour turnover during a year led to 40 replacements. The costs were: recruitment and selection ₹60,000, training ₹1,00,000, loss of output of new workers ₹80,000, extra scrap and tool breakage ₹40,000, and separation costs ₹20,000. Of the total, ₹1,20,000 arose from avoidable causes. Find the total cost of turnover, the preventable and unpreventable parts, and the cost per replacement.

Show the solution

Total cost = 60,000 + 1,00,000 + 80,000 + 40,000 + 20,000 = ₹3,00,000.
Preventable cost = ₹1,20,000 as given.
Unpreventable cost = 3,00,000 − 1,20,000 = ₹1,80,000.
Cost per replacement (illustrative) = 3,00,000 ÷ 40 = ₹7,500.

Answer: Total cost ₹3,00,000; preventable ₹1,20,000; unpreventable ₹1,80,000; cost per replacement ₹7,500.

Exam tips

For MCQs, check which method the question names. The same data gives three different answers.
In written answers, show the average workers line first. It earns a step mark even if a later figure is wrong.
When asked for causes and remedies, use the avoidable and unavoidable groups and pair each avoidable cause with one remedy, such as fair wages, better supervision, promotion policy and good working conditions.
For cost questions, keep separation costs and replacement costs under separate headings and total them clearly.
Add a one-line interpretation. ICMAI answers often reward a comment on what the rate suggests to management.

Practice questions from Employee Costs

Labour Turnover in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Labour Turnover: frequently asked questions

Which method of labour turnover is most commonly used?

All three are accepted, so use the one the question names. The separation method is the simplest. The flux method gives the fullest picture because it counts both exits and joiners.

What is the difference between the replacement and flux methods?

The replacement method counts only workers hired in place of leavers. The flux method counts all separations and all accessions, including extra hires for expansion.

What are preventable and unpreventable labour turnover costs?

Preventable costs come from avoidable causes such as poor pay, bad conditions, weak supervision or better prospects elsewhere. Unpreventable costs come from unavoidable causes like retirement, death, illness, marriage, relocation, redundancy or retrenchment, which management cannot control.

How can a company reduce labour turnover?

Fix the avoidable causes. Offer fair wages and incentives, improve working conditions, train supervisors, create promotion paths, select staff carefully and hold exit interviews to learn why people leave.