Rule of 40, le graal des SaaS performants

Rule of 40: A Key Metric for SaaS Companies

In the SaaS industry, where companies balance rapid growth with delayed profitability, the Rule of 40 has emerged as a key metric. It combines two critical indicators—growth and margin—into a single figure representing the overall performance of a recurring revenue model. This standard is used by investors to assess a company's quality, beyond just gross revenue.

Rule of 40 (%) = Annual ARR Growth Rate + EBITDA or Operating Cash Flow Margin

Growth Rate : Typically based on Annual Recurring Revenue (ARR) year-over-year.

Margin : Often expressed in EBITDA , but sometimes in operating margin or operational cash flow, depending on the company's maturity.

If the sum exceeds 40% , the company is considered balanced, performing well, and potentially attractive to growth or late-stage investors.

Why Has the Rule of 40 Become a SaaS Standard?

The Rule of 40 requires efficiency, preventing growth from masking cost overruns. It values companies that grow without excessive cash burn.

A company with 70% growth and -30% margin is as "performant" (score = 40) as one with 10% growth and 30% margin. Balance is key, not extremes.

Increasingly, late-stage funds, investment banks, and corporates use the Rule of 40 as an initial quality filter in evaluation or M&A processes.

Companies adhering to the Rule of 40 typically demonstrate good economic cycle management, economic units (CAC, LTV), and a path toward profitability.

Rule of 40 (%)

< 20% Unbalanced, underperforming model

20 – 39% Transitioning to maturity, potential for improvement

≥ 40% Performance standard in SaaS

60%

Exceptional performance, rarely sustainable long-term

ARR annual growth of 50% + EBITDA margin of -10% = Rule of 40 = 40%

Growth of 20% + EBITDA margin of 25% = Rule of 40 = 45%

In early-stage , a negative Rule of 40 is acceptable if growth is very strong (>100%) and supported by a controlled deployment strategy.

In Series B or C , adhering to the Rule of 40 becomes a prerequisite for significant fundraising or IPO within 24–36 months.

Some versions incorporate the free cash flow margin instead of EBITDA for a more conservative view.

– Reduce unit sales costs (via automation, inbound, product-led)

– Streamline support functions and infrastructure

Allocate Investments Based on Actual Impact

– Prioritize projects with rapid revenue impact

– Suspend spending not correlated to growth or margin

– Follow a rolling 12-month Rule of 40 trajectory

– Build a P&L with compared growth/margin scenarios

D’après FrenchWeb.