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Financial Management and Business Data Analytics · Leverage Analyses and EBIT - EPS Analysis

Operating Leverage and Degree of Operating Leverage (DOL)

Updated 10 October 2026 · Fact-checked

Operating leverage is the effect of fixed operating costs on EBIT when sales change. The degree of operating leverage (DOL) = Contribution ÷ EBIT. It shows the percentage change in EBIT for a 1% change in sales. A higher DOL means higher business risk.

Understand Operating Leverage and DOL

Every business has two kinds of operating cost. Variable costs move with sales, such as materials and direct labour. Fixed operating costs stay the same within the relevant range, such as factory rent, salaries and depreciation. Interest is not an operating cost. It belongs to financial leverage.

Contribution = Sales − Variable costs. It is the amount left to cover fixed operating costs. What remains after that is EBIT (earnings before interest and tax). So EBIT = Contribution − Fixed operating costs.

Operating leverage arises because fixed costs do not change when sales change. Once fixed costs are covered, each extra rupee of contribution goes straight to EBIT. So a small change in sales causes a larger change in EBIT. The same works in reverse when sales fall.

The degree of operating leverage (DOL) measures this. If DOL is 3, a 10% rise in sales raises EBIT by 30%. A 10% fall in sales cuts EBIT by 30%.

DOL is linked to business risk, the risk that EBIT will vary because of changes in sales. A firm with high fixed costs has high DOL and high business risk. DOL is highest near the break-even point and falls as sales move further above it. At break-even, EBIT is zero and DOL is undefined. DOL is also computed at a given sales level, so it changes as sales change.

Key rules to remember

Contribution
Contribution = Sales − Variable costs = Sales × P/V ratio
Use variable costs of all kinds, including variable selling and administration costs.
EBIT
EBIT = Contribution − Fixed operating costs
Do not deduct interest. Interest comes after EBIT.
Degree of operating leverage
DOL = Contribution ÷ EBIT
Valid at one given level of sales. EBIT must be positive.
DOL from percentage changes
DOL = % change in EBIT ÷ % change in sales
Use this to check the answer or when two sales levels are given.
DOL and fixed cost
DOL = 1 + (Fixed operating costs ÷ EBIT)
Follows from Contribution = EBIT + Fixed costs. DOL is always more than 1 when fixed costs exist.
Effect on EBIT
% change in EBIT = DOL × % change in sales
Applies to a change from the sales level at which DOL was computed.

How to solve Operating Leverage and DOL questions

Follow the same order for any DOL question. It keeps your layout clean and earns step marks.

  1. 1List sales, variable cost and fixed operating cost. Separate any interest, which is not part of operating cost.
  2. 2Prepare a short statement: Sales, less variable cost, equals contribution.
  3. 3Deduct fixed operating costs from contribution to get EBIT.
  4. 4Compute DOL = Contribution ÷ EBIT. Show the figures substituted.
  5. 5If the question gives a change in sales, find % change in EBIT = DOL × % change in sales. Then compute the new EBIT if asked.
  6. 6Check by recomputing EBIT at the new sales level, where practical.
  7. 7Interpret the result: state what the DOL means and whether business risk is high or low.

Quickest way: Contribution and EBIT shortcut

When to use it: Use it when the MCQ gives sales, variable cost and fixed cost, or gives contribution and EBIT directly.

  1. Find contribution first: Sales − Variable cost.
  2. Find EBIT: Contribution − Fixed cost.
  3. Divide contribution by EBIT.
  4. If fixed cost and EBIT are given, use 1 + Fixed cost ÷ EBIT.
  5. For a sales change, multiply DOL by the % change in sales to get the % change in EBIT.

Common mistakes in Operating Leverage and DOL

  • Dividing EBIT by contribution instead of contribution by EBIT.

    Students mix up the numerator and denominator.

    Fix: Remember that DOL is always above 1 when fixed costs exist. If you get less than 1, you have inverted it.

  • Deducting interest before finding EBIT for DOL.

    Students use profit before tax by habit.

    Fix: DOL uses EBIT only. Interest affects financial leverage, not operating leverage.

  • Using sales instead of contribution in the numerator.

    Students forget to subtract variable costs.

    Fix: Always build the statement: Sales, variable cost, contribution, fixed cost, EBIT.

  • Treating a variable or semi-variable cost as fully fixed.

    Cost data are given in a single list without labels.

    Fix: Read the question for which costs vary with output. Put only fixed costs below contribution.

  • Assuming DOL stays constant at all sales levels.

    Students apply one DOL to a large change in sales.

    Fix: DOL is valid for the sales level where it was computed. Recompute it at each new level.

  • Giving only a number and no interpretation.

    Students treat the question as pure calculation.

    Fix: Add one line: a DOL of X means a 1% change in sales changes EBIT by X%, so business risk is high or low.

Worked examples

Example 1

Sharma Tools Ltd has sales of ₹10,00,000, variable costs of ₹6,00,000 and fixed operating costs of ₹2,00,000. Calculate the degree of operating leverage. If sales rise by 10%, find the new EBIT.

Show the solution
  1. Contribution = 10,00,000 − 6,00,000 = ₹4,00,000.
  2. EBIT = 4,00,000 − 2,00,000 = ₹2,00,000.
  3. DOL = 4,00,000 ÷ 2,00,000 = 2.
  4. % change in EBIT = 2 × 10% = 20%.
  5. New EBIT = 2,00,000 × 1.20 = ₹2,40,000.
  6. Check: new sales = ₹11,00,000. Variable cost = 6,60,000. Contribution = 4,40,000. EBIT = 4,40,000 − 2,00,000 = ₹2,40,000.

Answer: DOL = 2. A 10% rise in sales raises EBIT by 20% to ₹2,40,000. The firm has moderate business risk because a fall in sales would cut EBIT twice as fast.

Example 2

Two firms sell 50,000 units each at ₹100 per unit. Firm A: variable cost ₹60 per unit, fixed cost ₹10,00,000. Firm B: variable cost ₹40 per unit, fixed cost ₹25,00,000. Compute the DOL of each and say which has higher business risk.

Show the solution
  1. Sales for each = 50,000 × 100 = ₹50,00,000.
  2. Firm A: variable cost = 50,000 × 60 = ₹30,00,000. Contribution = ₹20,00,000.
  3. Firm A: EBIT = 20,00,000 − 10,00,000 = ₹10,00,000. DOL = 20,00,000 ÷ 10,00,000 = 2.
  4. Firm B: variable cost = 50,000 × 40 = ₹20,00,000. Contribution = ₹30,00,000.
  5. Firm B: EBIT = 30,00,000 − 25,00,000 = ₹5,00,000. DOL = 30,00,000 ÷ 5,00,000 = 6.
  6. Check: 1 + 25,00,000 ÷ 5,00,000 = 1 + 5 = 6.
  7. Compare: a 10% fall in sales cuts Firm A's EBIT by 20% and Firm B's EBIT by 60%.

Answer: Firm A has DOL of 2. Firm B has DOL of 6. Firm B has the higher fixed cost, its EBIT is far more sensitive to sales, and so it has the higher business risk.

Exam tips

  • Always show the statement of sales, variable cost, contribution, fixed cost and EBIT. Marks are given for each line.
  • In MCQs, check which cost is fixed and which is variable before dividing. Distractor options often use sales or PBT.
  • Write a one-line interpretation. ICMAI answers expect you to link DOL to business risk.
  • If a question asks for combined leverage later, keep your DOL figure. It feeds into DCL = DOL × DFL.
  • Use the percentage change method to verify DOL when two sales levels are given.

Practice questions from Leverage Analyses and EBIT - EPS Analysis

Operating Leverage and DOL in other exams

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

Operating Leverage and DOL: frequently asked questions

What is the formula for the degree of operating leverage?

DOL = Contribution ÷ EBIT at a given level of sales. You can also write it as the percentage change in EBIT divided by the percentage change in sales. Both give the same result.

Can DOL be less than 1?

If the firm has fixed operating costs and positive EBIT, DOL is greater than 1. If fixed costs are zero, DOL equals 1. A value below 1 usually signals a calculation error.

What does a high DOL mean?

It means EBIT is very sensitive to changes in sales. This arises from high fixed operating costs. It gives higher profits when sales rise and larger losses when sales fall, so business risk is high.

Does DOL include interest?

No. DOL stops at EBIT. Interest is a financing cost and is dealt with in financial leverage.