← Business Metric: Operational (all topics)
Rule of 40 & the growth-profitability trade-off
What it is
A rule of thumb for subscription businesses that revenue growth rate plus profit margin should exceed 40%. It formalises the idea that fast growth justifies losses and slow growth does not
A company growing 60% may lose 20% and still qualify; one growing 10% must earn 30%
Impact on industries
- Compresses the growth-versus-profit debate into one testable number, so a business cannot claim credit for both narratives at once
- Forces a loss-making company to demonstrate that its growth actually justifies the spending
- The 40% threshold is a convention rather than a finding, and it fits software economics far better than capital-intensive businesses
- It is a screening heuristic, not a valuation method, and it says nothing about how durable either the growth or the margin is