Operating leverage is the sensitivity of operating profit to sales around a specific cost structure. It can create extraordinary margin expansion—and equally fast downside when revenue falls or capacity has been committed too early.
Operating Leverage: How Fixed Costs Turn Revenue Growth Into Profit — and Downturns Into Pain
RingCentral’s 2025 income statement is a useful reminder that revenue growth and profit growth are not the same thing.
From 2023 to 2025, RingCentral’s revenue rose from roughly $2.20 billion to $2.52 billion. Over the same period, operating results moved from a $198.8 million operating loss to $120.6 million of operating income. Subscription gross profit was already high, but the decisive change was that revenue kept growing while several large operating expense categories stopped growing with it. Sales and marketing was essentially flat at about $1.10 billion, R&D fell from about $336 million to $317 million, and G&A fell from about $333 million to $258 million. The result was not merely higher sales. It was a different relationship between sales and the cost base. SEC filing
That relationship is operating leverage.
It is one of the most useful ideas in business economics because it explains why two companies with similar revenue growth can produce radically different earnings outcomes. It also explains why a business that looks spectacular in an expansion can become fragile when revenue falls.
Operating leverage is not simply "having high fixed costs." It is the sensitivity of operating profit to changes in sales at a particular cost structure and level of output.
That last qualification matters. Operating leverage is not a personality trait a company permanently possesses. It changes with capacity, utilization, pricing, mix, and distance from break-even.
Start With the Equation, Not the Story
In managerial accounting, the degree of operating leverage can be written as:
Degree of Operating Leverage (DOL) = Contribution Margin / Operating Income
OpenStax uses this formulation when explaining cost-volume-profit analysis. Contribution margin is revenue minus variable costs; operating income is what remains after fixed operating costs. OpenStax
The same relationship can be expressed approximately as:
% change in operating income ≈ DOL × % change in sales
If a company has a DOL of 3.0 around its current sales level, a 10% increase in sales would, all else equal, imply roughly a 30% increase in operating income.
The phrase "all else equal" is doing serious work. Prices change. Product mix changes. wages change. Sales commissions can be variable. Capacity investments arrive in steps. Advertising may be discretionary rather than fixed. The formula is therefore a local sensitivity measure, not a forecast engine.
Still, it reveals something managers routinely miss: the same revenue dollar can have very different profit consequences depending on which costs must rise to produce it.
Why Fixed Costs Create Profit Convexity
Consider a simple software company:
- Revenue: $10 million
- Variable costs: $2 million
- Contribution margin: $8 million
- Fixed operating costs: $6 million
- Operating income: $2 million
Its DOL is:
$8M / $2M = 4.0
Now assume revenue rises 10% to $11 million and variable cost remains 20% of revenue.
- Revenue: $11.0 million
- Variable costs: $2.2 million
- Contribution margin: $8.8 million
- Fixed costs: $6.0 million
- Operating income: $2.8 million
Revenue increased 10%.
Operating income increased 40%.
That is the upside of operating leverage.
Now reverse it. Revenue falls 10% to $9 million.
- Variable costs: $1.8 million
- Contribution margin: $7.2 million
- Fixed costs: $6.0 million
- Operating income: $1.2 million
Revenue fell 10%.
Operating income fell 40%.
Nothing mysterious happened. The fixed-cost base absorbed none of the volume change. The contribution margin flowed almost directly into profit on the way up and disappeared from profit on the way down.
This is why operating leverage is better understood as profit sensitivity than as a synonym for "fixed costs."
The Same Profit Can Hide Very Different Risk
OpenStax illustrates this with two firms producing the same operating income but using different cost structures.
In its example, Company A has:
- Sales: $250,000
- Variable costs: $102,000
- Contribution margin: $148,000
- Fixed costs: $63,000
- Operating income: $85,000
- DOL: 1.74
Company B has:
- Sales: $315,000
- Variable costs: $105,000
- Contribution margin: $210,000
- Fixed costs: $125,000
- Operating income: $85,000
- DOL: 2.47
Both report $85,000 of operating income.
But they are not economically equivalent.
Company B’s higher fixed-cost structure creates more upside if sales rise and more downside if sales fall. The income statement at one point in time conceals that difference. OpenStax
For an investor, this means comparing operating margins without examining cost behavior can be misleading.
For an operator, it means a decision to automate, own infrastructure, build a factory, hire ahead of demand, or sign long-term capacity can alter the shape of future profits before it materially changes current profit.
Near Break-Even, Operating Leverage Can Become Enormous
DOL has an important mathematical property that makes it dangerous to quote without context.
Because operating income sits in the denominator, DOL rises sharply as operating income approaches zero.
Suppose a business has:
- Contribution margin: $5 million
- Operating income: $1 million
DOL = 5.
If operating income is only $250,000 with the same contribution margin, DOL = 20.
That does not mean management discovered a wonderful business model.
It means the company is operating close to break-even. Small changes in revenue can swing profit dramatically in either direction.
A company that moves from a $1 million loss to a $1 million profit has experienced a huge percentage improvement in operating earnings, but percentages around zero are unstable. The same issue appears in year-over-year comparisons where a small baseline creates spectacular-looking growth.
This is why sophisticated analysis pairs operating leverage with margin of safety.
Margin of safety asks how far current sales can fall before the company reaches break-even:
Margin of Safety = Actual Sales − Break-Even Sales
A high-DOL business with a large margin of safety may be financially comfortable. A high-DOL business barely above break-even may be extremely fragile.
Airlines Show the Downside Better Than Software
Software is often used to illustrate operating leverage because the marginal cost of another subscription can be low relative to R&D, sales infrastructure, and administrative costs.
Airlines expose the opposite side of the same mechanism.
Delta disclosed at the end of 2025 approximately $7.8 billion of minimum operating lease obligations and about $6.0 billion of estimated minimum fixed obligations under capacity-purchase agreements with regional carriers. Delta 2025 Form 10-K
Aircraft leases, minimum capacity commitments, airport infrastructure, technology, and portions of labor expense do not disappear merely because demand weakens for a quarter.
An empty seat after departure cannot be stored and sold next month.
This creates a brutal asymmetry:
when demand is strong, additional passengers can contribute disproportionately to profit because much of the flight’s cost is already committed;
when demand collapses, the airline cannot shrink its cost base at the same speed as revenue.
That is operating leverage interacting with perishable capacity.
The distinction matters because not all high-fixed-cost businesses face the same risk. A software company can often serve the next customer without a new data center or employee. An airline cannot add passengers beyond the aircraft’s physical capacity. Once capacity is full, the next unit of growth may require another aircraft, crew, gates, and scheduling complexity.
Operating leverage therefore often moves in steps, not a smooth line.
RingCentral Shows the Upside — But Also Why the Story Must Be Decomposed
RingCentral’s 2025 results provide a cleaner look at the upside.
Revenue increased from about $2.20 billion in 2023 to $2.52 billion in 2025. Gross profit increased from about $1.54 billion to $1.79 billion. Meanwhile, total operating expenses fell from roughly $1.74 billion to $1.67 billion. Operating results improved from a $198.8 million loss to a $120.6 million profit. RingCentral 2025 Form 10-K
It would be tempting to summarize this as "software operating leverage."
That would be too easy.
Part of the improvement came from revenue growth. Part came from expense discipline: G&A declined substantially, R&D declined, and sales and marketing barely changed despite higher revenue. The operating leverage was therefore not purely an automatic feature of software economics. Management also changed the expense trajectory.
That distinction is useful.
There are at least three different sources of apparent operating leverage:
- Structural leverage — costs genuinely do not rise proportionally with revenue.
- Utilization leverage — existing capacity was underused and new volume fills it.
- Managerial leverage — management actively restrains or reduces expenses while revenue continues to grow.
All three can improve operating margins. They carry different persistence.
A data center with unused capacity may eventually fill. A hiring freeze may reverse. A truly scalable software architecture may support far more revenue without equivalent cost growth.
Investors should not treat them as interchangeable.
Gross Margin Is Not Operating Leverage
This is a common analytical error.
Gross margin measures:
(Revenue − Cost of Revenue) / Revenue
Operating leverage concerns how changes in sales flow through the entire operating cost structure into operating income.
A company can have an 85% gross margin and weak operating leverage because it spends aggressively on sales, R&D, support, and administration as revenue grows.
Conversely, a lower-gross-margin business can show strong operating leverage if overhead is stable and incremental volume produces meaningful contribution profit.
A 2026 filing for one software company, for example, reported SaaS gross margin of about 85.1%, but that tells us only about the economics above gross profit; it does not tell us whether sales and marketing, R&D, and G&A scale efficiently. SEC filing
The distinction is important in valuation.
"High gross margin" describes product economics.
"Operating leverage" describes how the organization converts scale into operating profit.
Five Decisions That Change Operating Leverage
Operating leverage is partly designed.
1. Hire employees or use variable external capacity
A company can build an in-house implementation team or pay partners per project.
In-house capacity can create higher margins when fully utilized, but the payroll remains if demand slows.
Partner capacity usually sacrifices some unit economics for flexibility.
2. Own infrastructure or rent it
Owning factories, warehouses, fleets, data centers, and machinery raises committed costs but may lower unit cost at scale.
Renting or using cloud/contract capacity often raises variable cost while preserving flexibility.
The decision is not "fixed costs bad."
It is a bet about utilization.
3. Automate or keep labor variable
Automation can convert labor expense into software, equipment, depreciation, and maintenance.
If demand is stable and volume is high, the economics can be excellent.
If demand is uncertain, the automation can become idle capital.
4. Build sales capacity ahead of revenue or after proof
Hiring twenty salespeople before pipeline exists creates fixed or semi-fixed operating expense in anticipation of future revenue.
Waiting preserves cash but may constrain growth.
Operating leverage begins before the revenue arrives.
5. Commit to minimum volumes
Manufacturing agreements, shipping contracts, media commitments, leases, and cloud commitments can reduce unit prices in exchange for minimum spending.
They convert uncertain future demand into a contractual cost floor.
That can be smart procurement—or hidden leverage.
A Better Sensitivity Model Than "Revenue Up 10%"
Executives should not model operating leverage using one top-line scenario.
A useful operating model separates four layers:
Price: Can revenue rise without additional unit volume?
Volume: How many more units/customers must be served?
Variable cost per unit: Does contribution margin remain stable as scale changes?
Step-fixed costs: At what point does the business need another sales team, facility, aircraft, server cluster, warehouse, or management layer?
Consider a company with:
- 100,000 units sold
- $100 price
- $40 variable cost per unit
- $5 million fixed operating cost
Current results:
Revenue = $10.0M
Contribution margin = $6.0M
Operating income = $1.0M
DOL = 6.0
Management forecasts 20% volume growth.
If existing capacity handles 120,000 units:
Revenue = $12.0M
Contribution margin = $7.2M
Operating income = $2.2M
Operating income rises 120%.
But suppose crossing 110,000 units requires another facility with $900,000 annual fixed cost.
Then operating income at 120,000 units becomes only $1.3M.
The spreadsheet that assumed fixed costs stay fixed would have overstated profit by nearly 70%.
That is why capacity thresholds matter more than the label "high operating leverage."
High Operating Leverage Is Not Automatically Good
Investors often admire expanding operating margins because they can signal scale economics.
Operators often seek the same thing because a growing share of incremental gross profit reaches the bottom line.
But maximum operating leverage is not the objective.
A company facing volatile or uncertain demand may rationally pay more for flexibility.
OpenStax explicitly notes the logic of shifting some costs from fixed to variable when insolvency risk matters. OpenStax
The trade-off is:
efficiency at high utilization vs resilience at low utilization.
A manufacturer that owns highly specialized equipment may dominate unit costs at 90% utilization and suffer at 50%.
A competitor using contract manufacturers may have worse unit economics in the boom and far less downside in the bust.
Neither cost structure is universally superior.
The right structure depends on demand predictability, access to capital, capacity lead times, switching costs, and the value of strategic control.
How Investors Should Read Operating Leverage
A good operating-leverage analysis asks more than whether margins expanded.
Look for:
Revenue growth without equivalent operating-expense growth.
This is the visible outcome.
The source of expense restraint.
Was it structural scalability, layoffs, lower marketing, delayed hiring, mix, or temporary underinvestment?
Incremental margin.
How much of each additional revenue dollar became operating profit?
A rough incremental operating margin is:
Change in Operating Income / Change in Revenue
For RingCentral from 2023 to 2025:
Change in operating income ≈ $319.4M
Change in revenue ≈ $312.7M
That extraordinary ratio reflects both revenue growth and a reduction in operating expenses, so it should not be extrapolated mechanically. It is nevertheless an excellent warning that the average margin and the incremental margin can tell very different stories.
Capacity ceilings.
When must costs step up again?
Downside obligations.
Lease commitments, minimum purchases, debt service, labor rigidity, and infrastructure commitments tell you what survives a revenue shock.
Mix.
A company shifting from professional services toward higher-margin subscriptions may appear to gain leverage because the revenue mix changed.
The question is not only "Are margins expanding?"
It is "What exactly must remain true for them to keep expanding?"
The Management Rule: Measure the Cost That Arrives With the Next Dollar
The most useful way to think about operating leverage is not fixed versus variable in an accounting textbook.
Ask:
What additional costs arrive with the next $1 million of revenue?
Then ask the same question for:
the next $10 million;
the next $100 million;
and a 20% decline.
At each scale, the answer changes.
A young SaaS company may add almost no infrastructure for another $1 million but need twenty enterprise sellers to add $20 million.
A factory may have spare capacity for 5% growth but require a new production line for 25%.
An airline may add passengers to an existing schedule at attractive incremental economics, yet need aircraft and crews for route expansion.
Operating leverage is therefore best understood as the shape of the operating profit curve, not a static ratio.
The attractive version is not simply "high leverage."
It is a cost structure where revenue can grow materially before the next large block of cost arrives, while the company still has enough flexibility and liquidity to survive when demand moves the other way.
That is the form of operating leverage worth paying for.
Sources & Further Reading
- OpenStax, Principles of Managerial Accounting: margin of safety and degree of operating leverage. https://openstax.org/books/principles-managerial-accounting/pages/3-5-calculate-and-interpret-a-companys-margin-of-safety-and-operating-leverage
- RingCentral, 2025 Form 10-K. https://www.sec.gov/Archives/edgar/data/1384905/000138490526000021/rng-20251231.htm
- Delta Air Lines, 2025 Form 10-K. https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm
- SEC filing example on SaaS and services margin structure. https://www.sec.gov/Archives/edgar/data/1081745/000149315226013568/form10-k.htm
This article is educational and does not constitute financial, legal, accounting, or investment advice. Use current company data and professional guidance where appropriate.