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The Rule of 40: How to choose the right SaaS startup

  • In today’s nervy economic climate, where funding is still scarce , making the right career choice is crucial.

  • If you’re considering joining a SaaS startup, understanding the key challenges and financial health of your potential employer is more important than ever.

  • One effective tool to gauge this is the Rule of 40. Here’s why it matters and how you can use it to make an informed decision.


📊 The Rule of 40: Your Litmus Test for SaaS Startup Health


The Rule of 40 is a simple metric used to assess a SaaS startup’s financial balance. It states that the combined percentage of a company's revenue growth rate and its profit margin should equal or exceed 40%.


Formula: Revenue Growth Rate + Profit Margin ≥ 40%


Why It’s Important Now


In times when funding is scarce, SaaS startups with a strong financial foundation are more likely to survive and thrive. The Rule of 40 helps you determine if a SaaS startup is on solid ground.


Bar chart showing declining VC funding over the past 3 years.
Funding is tight across the VC landscape

🧮 How to Apply the Rule of 40


  • Ask About Growth and Profitability: During your interviews, inquire about the company’s revenue growth rate and profit margin. Don’t hesitate to ask for specifics.


  • Do the Math: Use the Rule of 40 to see if the startup meets the threshold. For example, if the company has a 30% growth rate and a 15% profit margin, they meet the Rule of 40 with a total of 45%.


  • Look for Balance: A SaaS startup with high growth but low profit might be taking big risks. Conversely, a startup with high profit but low growth might lack innovation. The Rule of 40 helps you see if they have a good balance.


❓ Other Financial Questions to Ask


  • Cash Flow and Burn Rate: How long can the company sustain itself with its current cash reserves?


  • Customer Acquisition Cost (CAC) vs. Lifetime Value (LTV): Is the cost to acquire a customer justified by the revenue that customer will generate?


  • Churn Rate: How many customers are leaving over a given period? High churn can indicate dissatisfaction.


  • Debt and Equity: How is the company financed? High debt can be risky.


🔥Burn & Churn


With short runways, startups can't afford best in class advice, leading to CAC, LTV and churn issues. On the flip side, some take time hiring an exec, letting the fire burn wild. As a fractional CMO, I often come into startups and address these issues fast. Address growth and CAC quickly without a hefty exec salary, and reassure incoming talent that the company is heading in the right direction.


💼 Why You Should Care


  • Job Security: SaaS startups that meet or exceed the Rule of 40 are generally more stable, reducing your risk of layoffs or company closure.

  • Growth Potential: Such startups are better positioned to attract funding and expand, offering you more opportunities for career advancement.

  • Financial Health: Knowing the startup is financially sound provides peace of mind, letting you focus on your role without constant worry about the company’s viability.


📝 Practical Steps


  1. Research: Before your interview, research the company’s financial reports or news articles that mention their financial performance.

  2. Ask Direct Questions: In interviews, directly ask about their revenue growth and profit margins. Explain that you’re assessing the company’s stability in the current economic climate.

  3. Evaluate the Responses: If the SaaS startup meets or exceeds the Rule of 40, it’s a positive sign. If not, weigh the risks carefully before making a decision.


⚠️ Exceptions


While the Rule of 40 is a great benchmark, there are always exceptions, and investment criteria is obviously a lot more complex than athis simple eye test. A great resource is the "Rule of 40 Index" from Volition Capital, where you can compare your own firm. Here, they talk about one notable exception to the rule - MongoDB, a successful SaaS company that did not pass the rule of 40.



💸 VC Funding - Challenges & Green Shoots


Over the past couple of years, venture capital funding has become harder to come by for startups. Investors have become more cautious, focusing on profitability and sustainable growth rather than just top-line growth. This shift has made it more difficult for startups, especially those in their early stages, to secure the necessary funding to scale. However, there are green shoots, for instance, Q2 VC funding in 2024 was up on Q1 , with notable raises by Index and Flagship in July 2024.


🔍 Bottom Line


In a world where startup funding is increasingly difficult to come by, applying the Rule of 40 can be your safeguard. It helps you identify SaaS startups that not only have growth potential but also financial resilience. It can also help you impress founders and startup executives during the hiring process.

This metric ensures that you’re making a career move that offers both excitement and security. Always remember, a financially healthy startup is more likely to provide you with a stable and rewarding career path.

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