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Fixed vs. Variable Expenses: Breaking it Down Simply

By Ana Gotter on December 27, 2023
Last updated on March 19, 2026

Ever wonder why some businesses, especially startups and subscription-based ones, struggle with cash flow? It turns out that managing expenses is super important, and a whopping 82% of small businesses that shut down cite cash flow problems as the culprit.

So, let's talk expenses, but let's keep it simple. We're diving into fixed and variable expenses, what they are, how they affect your business, and why knowing the difference can be a game-changer for your budget.

fixed-variable

What Are Fixed Expenses?

Imagine expenses that are like your Netflix subscription; they don't change much from month to month. These are your fixed expenses. They’re pretty predictable, and you can usually set them on auto-pay and forget about them.
Some examples of fixed costs for SaaS business include:

  • Rent for your office space
  • Business insurance (like liability insurance)
  • Internet and phone bills
  • Salaries and benefits for your team
  • Loan repayments

What About Variable Expenses?

Variable expenses are more like your grocery bill; they change depending on what you need or use each month. If your business is selling more, these costs go up. If sales are slow, they go down. They’re generally tied to your business activity.

Some examples of variable costs for SaaS business include:

  • Transaction fees for credit cards or invoicing
  • SaaS tools or software that bill based on usage
  • Server space costs, which grow as more customers use your service
  • Commissions and bonuses for your sales team

Spotting the Difference

In short, fixed costs are steady and reliable. You know what they'll be regardless of how your business is doing. Variable costs, on the other hand, move up and down based on your sales or use of certain tools.

For instance, what you pay for your rent won’t change whether you sell a little or a lot. But your sales team's commissions can swing from a tiny amount to a whole lot, depending on your sales.

Calculating Fixed and Variable Expenses

Knowing your total expenses is great, but breaking them down into fixed and variable can help you manage your budget and avoid those dreaded cash flow issues.

  • To figure out your fixed expenses, just add up all the regular bills you pay
  • For variable expenses, calculate the cost per unit sold or produced, then multiply it by the total quantity you sold or produced

Maximizing Revenue

Let's dive a bit deeper and talk about how you can manage these costs. Smart cost management not only helps in avoiding cash flow problems but can also boost your overall profitability.

Managing Fixed Expenses

Fixed expenses are pretty consistent but there are ways to trim them down:

  1. Do you really need all those different subscriptions? Sometimes, one tool can do the job of three.
  2. If remote work is an option, consider downsizing your office to cut rent and utility bills.
  3. Whether it's with your landlord or service providers, there's often room to negotiate better rates with most services.
  4. Automating repetitive tasks can save lots of time and money in the long run.

Managing Variable Expenses

Variable expenses change with your business activity. Here's how to keep them in check:

  • Many SaaS companies spend a lot on cloud services, regular monitoring and optimization can cut costs significantly.
  • Refining your marketing strategy to target the right audience can reduce customer acquisition costs
  • Streamlining your operations can reduce waste and increase productivity, lowering production costs

General Cost-Reduction Strategies

Beyond fixed and variable expenses, here are some overall strategies for cost reduction:

  • Keep an eye on where every dollar goes and see if there are areas where you can cut back on decisions
  • Use data analytics to make informed decisions about where you can save money without impacting quality
  • It's cheaper to keep existing customers than to find new ones, so invest in keeping your current customers happy

Final Thoughts

In the world of SaaS businesses, balancing the books goes beyond just keeping track of overall expenses.

It's about making smart, strategic decisions on how to optimize your spending. Keeping a close eye on both fixed and variable expenses is crucial for managing your cash flow and maintaining healthy profits.

This is where Baremetrics can be a game-changer. Our revenue analytics software is designed to help subscription businesses like yours track vital metrics, offering you a clear, up-to-date view of your financial performance.


Interested in taking control of your financial journey? Check out Baremetrics and discover how we can help you navigate the complexities of SaaS finances with ease.

FAQ

  • What is the difference between fixed and variable expenses for a SaaS business?
    Fixed expenses stay constant regardless of how much revenue your SaaS generates, while variable expenses rise and fall with your business activity. Fixed costs include things like office rent, salaries, and business insurance. Variable costs, by contrast, are tied directly to your output or sales volume, such as transaction fees, usage-based software subscriptions, server costs that scale with your customer base, and sales commissions. For subscription businesses, understanding this split is foundational to managing cash flow, because your fixed cost base creates a floor you have to clear every month before you make a single dollar of profit.
  • How do I categorize and track fixed versus variable expenses for my subscription business?
    Start by pulling every recurring expense line and asking one question: does this cost change when your customer count or revenue changes? If the answer is no, it is a fixed expense. If it moves with usage, sales volume, or headcount tied to growth, it is variable. Once you have sorted your costs into those two buckets, you can calculate your total fixed cost base and your variable cost per unit or per customer. From there, tracking these categories over time is where the real insight comes in. A tool like Baremetrics gives subscription businesses a live view of revenue metrics alongside cost data, so you can see whether your variable expenses are scaling in proportion to MRR or quietly eating into your margins.
  • Why do fixed and variable costs matter for SaaS unit economics and LTV?
    Fixed and variable costs sit at the heart of SaaS unit economics because they determine how profitable each new customer actually is. Your fixed costs are spread across your entire subscriber base, so as MRR grows, those costs become a smaller share of revenue per customer. Variable costs, on the other hand, scale with every new account, directly affecting gross margin and LTV. If your variable expenses like server costs, payment processing fees, and commissions are growing faster than revenue, your LTV shrinks even when your customer count is climbing. Baremetrics surfaces LTV and MRR trends in real time, which makes it much easier to spot when variable cost creep is quietly undermining your unit economics before it becomes a cash flow problem.
  • What are the most effective ways to reduce variable expenses without hurting SaaS growth?
    Reducing variable expenses in a SaaS business is really about improving efficiency rather than cutting indiscriminately. The biggest lever most subscription companies have is cloud and infrastructure spend, where regular audits of server usage and rightsizing instances can significantly lower costs without touching the customer experience. Refining your acquisition channels to focus on the ones with the lowest cost per acquired customer reduces marketing spend per unit of growth. Investing in retention is another high-return move, since keeping an existing customer costs far less than replacing one lost to churn. Streamlining operations to reduce manual work also lowers the variable labor costs that tend to creep up as a business scales.
  • How can a SaaS founder use the fixed versus variable expense breakdown to improve cash flow management?
    Knowing your fixed versus variable expense split gives you a much clearer picture of the minimum revenue you need to keep the business running and how your costs behave as you scale. Your fixed cost total tells you the floor: the MRR you need before you break even each month. Your variable costs tell you how your margins will move as you add or lose customers. With that breakdown in place, you can model different growth scenarios, stress-test what happens to cash flow if churn spikes, and make smarter decisions about when to hire or invest. Baremetrics was built specifically for this kind of financial visibility in subscription businesses, connecting your Stripe data to real-time MRR, churn, and forecasting dashboards so you are not managing these decisions off a spreadsheet.

Ana Gotter

Ana Gotter has been a devoted writer since primary school. She graduated from Florida State University with degrees in writing, business, and communications. Launching into freelancing in 2012 and shifting to full-time in 2014, Ana has since been an invaluable asset to businesses and nonprofits, blending her deep understanding of business and marketing strategies.