Key takeaways
- Operating leverage, the ratio of fixed to variable costs, determines how much EBITDA changes for a given change in revenue; a business with 70% fixed costs sees EBITDA improve 3-4x faster than revenue when growing.
- Buyers model downside scenarios using your fixed cost base, if 70% of your costs are fixed and revenue declines 20%, they need to understand whether the business still covers debt service; high fixed costs amplify downside risk as much as upside potential.
- Variable cost businesses (staffing, project-based services, commodity distribution) are valued differently than fixed-cost businesses (SaaS, licensed software, subscription services), understanding which model you have is essential for setting valuation expectations.
- Most middle market businesses have more variable costs than they think, reclassifying costs correctly (not just as reported) often reveals that supposedly fixed costs have significant variable components.
Defining fixed and variable costs correctly
Fixed costs are costs that do not change with revenue in the short term: rent, depreciation, salaried headcount, software subscriptions, insurance. Variable costs change with revenue: direct materials, hourly labor tied to production volume, commissions, freight, credit card processing fees.
The challenge in middle market cost analysis is that most costs are semi-variable, they have a fixed component and a variable component. A management team with 10 people has a fixed minimum cost (the base team) and a variable component (overtime, bonuses, project staff). Understanding the split requires more than categorizing by account code; it requires analyzing cost behavior as revenue has changed historically.
60-70%
typical fixed cost percentage in asset-light service businesses
30-45%
typical fixed cost percentage in distribution and manufacturing businesses
2-4x
operating leverage ratio, how much faster EBITDA grows vs. revenue at high fixed-cost percentages
How buyers use cost structure analysis in valuation
Buyers model your cost structure in two scenarios: the upside case (revenue grows as projected, EBITDA expands faster than revenue due to operating leverage) and the downside case (revenue declines, EBITDA compresses faster due to fixed cost drag). Both matter for valuation.
A business with high operating leverage, say, 70% fixed costs, is attractive in a growth scenario but scary in a downside scenario. If your revenue declines 20% and 70% of your costs are fixed, EBITDA may decline 50-60%. Buyers who model this will either require a lower entry multiple or a more conservative leverage structure to protect against downside.
Businesses with clearly documented fixed vs. variable cost structures achieve higher LOI prices on average than businesses requiring buyers to derive the cost structure from P&L analysis, because buyer certainty about downside scenarios reduces risk premiums.
Operating leverage analysis is among the top five diligence topics raised by PE buyers in management presentations for businesses with EBITDA margins above 20%.
A cost structure that looks fixed at scale may actually be more variable than it appears. Founders who have managed their headcount carefully in downturns have implicitly demonstrated variable cost behavior in what appears to be a fixed-cost item. Document this history, it is a credit to management quality and a signal to buyers about downside resilience.
60–70%
typical fixed cost % in asset-light service businesses
2–4x
how much faster EBITDA grows vs. revenue at high fixed-cost percentages (operating leverage)
20% revenue decline
on a 70% fixed-cost base can produce 50–60% EBITDA decline
Higher multiple
businesses that clearly document cost structure vs. those requiring buyer derivation
Cost Structure Comparison by Business Model
Scroll to see more →
Buyers do not just ask "what are your costs?" They ask "what happens to your costs if revenue drops 20%?" A founder who can answer that question with data, not a guess, is demonstrating the operating discipline that buyers pay a premium for.
Work with Glacier Lake Partners
Get a cost structure analysis for your business
We help management teams map fixed vs. variable costs, calculate operating leverage, and present cost structure analysis in a way that supports valuation.
Start a Conversation →Research sources
Explore adjacent topics
