Computing operating leverage would be easy if the proportion of fixed and variable costs could be known with certainty. Consider a stylized example: Operating leverage is computed by dividing the contribution margin (revenues less variable costs) by the operating income. In this case, operating leverage is 1.50 (300/200). So, a 10% increase in revenues should yield a 15% increase in operating income (10% * 1.5). As seen above, a 20% increase in sales yielded a 30% increase in operating income. Since our example had no interest expense, there is no financial leverage and the increase in taxes and net income was also 30%.
The company benefits from operating leverage as it grows since fixed costs do not increase and existing fixed costs are “spread” across higher revenues. As a percentage of revenues, the fixed costs shrink. Of course operating leverage will also work against the firm if revenues fall since fixed costs do not fall accordingly. In fact, in our stylized example, if revenue were to fall by 20%, operating income would fall by 30%.
Operating leverage also does not remain constant; it must be recomputed each period as the relationships among contribution margin, fixed costs, and operating income change. Statistical techniques such as regression analysis can be useful for this purpose. A shortcut method of approximating operating leverage is to divide the change in operating income by the change in sales:
Percentage Change in Operating Income
Percentage Change in Revenues
Definition of Degree of Operating Leverage (DOL):
The degree of operating leverage (DOL) is a measure, at a given level of sales of how a percentage change in sales volume will effect profits.
Formula:
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