Early in my career I worked with a DTC brand that was scaling fast. Revenue was climbing, the marketing team was celebrating, and the founder kept saying "we'll grow into our costs." Six months later they ran out of cash. Not because the product failed or the ads stopped working, but because they'd stacked up so many fixed costs (a warehouse lease, a full-time content team, enterprise software subscriptions, a PR retainer) that their break-even point was unreachable at their current volume. The revenue growth couldn't outpace the fixed overhead.
That experience taught me something most marketing courses never cover: fixed costs are the structural foundation of every business model, and if you don't understand them, you can't understand profitability.
Fixed costs are expenses that remain constant regardless of how much a company produces or sells within a given period. Whether you sell 10 units or 10,000, your fixed costs stay the same. They're the baseline operating expenses that keep the lights on, the team employed, and the infrastructure running.
According to QuickBooks, common fixed costs include rent or lease payments, salaried employee wages, insurance premiums, loan payments, property taxes, and software subscriptions. These don't fluctuate with sales volume in the short term.
The formula to isolate fixed costs is simple:
Fixed Costs = Total Costs − (Variable Cost Per Unit × Number of Units Produced)
Or, if you're looking at your P&L, fixed costs are everything in operating expenses that doesn't scale with production volume.
The tension between fixed and variable costs is one of the most important dynamics in business. Understanding it changes how you think about marketing strategy, pricing, and growth.
| Characteristic | Fixed Costs | Variable Costs |
|---|---|---|
| Behavior with volume | Stay constant | Increase/decrease with output |
| Examples | Rent, salaries, insurance, software | Raw materials, commissions, shipping |
| Predictability | Highly predictable | Fluctuates with demand |
| Time horizon | Fixed in short term, adjustable long term | Adjustable immediately |
| Impact on break-even | Higher fixed costs = higher break-even point | Higher variable costs = lower margin per unit |
| Scaling effect | Spread across more units as volume grows (operating leverage) | Remain proportional to each unit |
Here's what I find genuinely interesting about this: the ratio of fixed to variable costs fundamentally shapes a company's risk profile. A company with high fixed costs (like a SaaS business with a large engineering team) has enormous operating leverage, meaning once they cross the break-even threshold, additional revenue is almost pure profit. But below that threshold, they burn cash fast.
A company with mostly variable costs (like a dropshipping business) has lower risk but also lower upside. They make a small margin on every sale regardless of volume, but they'll never experience that hockey-stick profit curve.
This is where things get practical for marketers. HubSpot categorizes marketing-related fixed costs into several buckets:
Clearly fixed marketing costs: