Operating Leverage
Operating leverage describes how fixed costs amplify the effect of revenue changes on operating profit. A business that pays for factories, software, or staff regardless of volume converts each incremental sales dollar into profit at a high rate, and converts each lost sales dollar into pain at exactly the same rate.
The math
Start with $100M of revenue, variable costs at 40 percent of sales, and $45M of fixed costs: operating profit is $15M. Revenue grows 10 percent to $110M, variable costs rise to $44M, fixed costs stay put, and profit reaches $21M, a 40 percent jump.
The same mechanics work downhill: a 10 percent revenue decline drops profit to $9M, down 40 percent.
| Revenue -10% | Revenue +10% | |
|---|---|---|
| Revenue | $90M | $110M |
| Operating profit | $9M | $21M |
| Equity at a 20x multiple | $180M | $420M |
Four dollars of profit move for every dollar of sales.
The trap
Mistaking leverage for growth. When a high-fixed-cost business rides a revenue upswing, earnings explode, and the market often capitalizes the new margin level as permanent, awarding a premium multiple to what are really peak profits.
Buyers at that moment face double jeopardy: earnings that mean-revert and a multiple that contracts alongside them.
The move
Estimate the fixed-versus-variable cost split from margin history and segment disclosures, then model what a 10 to 15 percent revenue decline does to earnings before committing capital. Check financial leverage alongside, because debt service is one more fixed cost and the two leverages multiply each other.
High operating leverage argues for a larger margin of safety on the way in, and becomes a gift when bought near the bottom of a cycle.