What is
SaaS Rule of 40
?
The Rule of 40 is a high-level benchmark used to evaluate the balance between growth and profitability in software companies. It states that a healthy SaaS company’s combined annual growth rate and profit margin should exceed 40%. For example, a company growing at 60% with a -20% profit margin passes the rule (60 - 20 = 40). It was designed to address the unique nature of SaaS, where companies often lose money in the short term to acquire valuable long-term recurring revenue. The rule treats growth and profit as interchangeable 'value' drivers; as a company matures and growth naturally slows down, it is expected to become more profitable to maintain its Rule of 40 status. Investors use this metric to separate 'Growth at All Costs' companies from those with sustainable business models. Reaching and maintaining Rule of 40 status is often the prerequisite for a high-valuation IPO or a successful exit in the software industry.
Frequently asked questions.
Is the Rule of 40 for early-stage startups?
It is best applied to companies at $10M+ ARR; early stage is often too volatile for the metric.
Does it prioritize growth or profit?
It treats them equally; you can have 50% growth and -10% margin and still pass.
What is the best profit metric for this?
Usually EBITDA margin or Free Cash Flow margin is used.
Why do VCs love this metric?
It proves that growth isn't being 'bought' at an unsustainable financial cost.
What if my score is 30%?
It's still decent, but 40%+ is the 'Gold Standard' for high-valuation software companies.
