The Rule of 40 is a financial benchmark used to assess the performance and sustainability of fast-growing Software-as-a-Service (SaaS) companies.
It’s a financial metric suggesting a Software as a Service (SaaS) organization’s combined revenue growth rate and profit margin should equal or exceed 40% to demonstrate financial health to potential investors.
The Rule of 40 balances revenue growth and profitability for SaaS companies by requiring their sum to reach or exceed 40%.
Definition
The Rule of 40 adds a company’s year-over-year revenue growth rate (in percentage) to its profit margin, typically EBITDA margin, though alternatives like operating or free cash flow margins apply. Popularized by Brad Feld, it assesses sustainability in high-growth tech firms where pure growth or profit alone misleads.
Calculation
Compute as: Rule of 40 = Revenue Growth Rate (%) + EBITDA Margin (%). For example, 30% growth plus 15% margin equals 45%, passing the rule; 20% growth plus 15% equals 35%, falling short. Use trailing periods like three to twelve months for stability, and weight growth higher (e.g., 1.33x) for early-stage firms.
Usage in Investing
Investors favor scores above 40% as it signals efficient scaling without excessive losses, guiding valuations and M&A.
Track trends over time: improving scores indicate health, while drops below 30-40% flag risks in competitive markets. Mature firms may prioritize margins, while startups lean on growth.
Source: https://www.paylocity.com/resources/glossary/rule-of-40/