Capital, cash and fundraising · Answered by Golden Section from more than 400 B2B software companies observed
The Rule of 40 says a software company's revenue growth rate plus its profit margin should be at least 40%. A company growing 30% with a 10% EBITDA margin passes; one growing 60% while losing 30% scores 30 and does not. State which margin you use, EBITDA or free cash flow, because the score moves with it. For companies between $1M and $8M in annual revenue we treat it as a direction rather than a gate, because small-company growth swings and margins are largely chosen. What we want to see is 25% to 40% growth with a dated path to 10% net profit and then 20%, which puts the company at or above 40 by the time a buyer is looking. Compute it quarterly on a trailing twelve-month basis.
Below about $10M in annual revenue, use the Rule of 40 to check that growth and margin are moving the right way together, not as a pass or fail. By the time an exit process starts, expect to clear it on a trailing basis with the margin definition stated.
| Metric | Value | What it means | Source |
|---|---|---|---|
| Rule of 40 score | 40 or higher | revenue growth % + profit margin %SaaS Capital uses EBITDA margin and found scores generally declined from 2023 to 2025 across almost all ARR sizes | External benchmarkSaaS Capital, Growth, Profitability, and the Rule of 40 for Private SaaS Companies (August 2025) |
| EBITDA margin | 20%+ | EBITDA ÷ revenueGolden Section target trajectory at $10M+ ARR | Golden Section, publishedThe Balanced Path |
| 2022 drawdown by Rule of 40 | 58% above vs 78% below | peak-to-trough multiple compression, public softwarethe 2021–22 unwind punished companies below the rule far harder | Golden Section, publishedInvesting in Software |
| Mature cash-flow margin | 45–50% only with 80%+ gross margin and 95%+ gross retention; otherwise 25–35% | steady-state cash-flow margin, before stock compensationeach point of gross retention below 95% costs 1.3–2.0 points of margin | Golden Section, publishedInvesting in Software |
The rule exists because growth and profit trade against each other, and investors wanted one number that rewarded either. For a public company at scale it works reasonably well. For a $3M company, one large deal can move growth by 20 points, and a founder can move margin by 20 points by deciding whether to hire two sellers this quarter. The score ends up measuring timing as much as quality.
It still matters, because buyers use it. In the 2022 drawdown, public companies below the Rule of 40 lost 78% of their value against 58% for those above. Private equity buyers underwrite it directly, which is why it sits on the benchmark sheet in the meaningful exit plan. A company that arrives at a process scoring 25 is priced as one that cannot choose between growth and profit.
The durable way to score well is retention. Our addendum finds that gross retention, more than cost structure, sets the margin a software company can reach: every point below 95% costs 1.3 to 2.0 points of steady-state margin. Read the P&L with that in mind before targeting a score.
Two companies at $3M in annual revenue. The first grows 60% with a −25% EBITDA margin, a score of 35. The second grows 28% with a 12% margin, a score of 40, so on the rule alone it wins. But the first retains 110% net and books new ARR at $0.70 per dollar, so its loss buys revenue that stays. The second retains 92% net, and its margin comes partly from an unfilled sales role. A year on, their positions may well reverse. The score is a summary; the retention and efficiency underneath it decide which company is healthier. Both companies are invented.
The rule is least useful below about $2M in annual revenue, where both terms are noisy, and during a deliberate, time-limited investment such as a platform rebuild. In both cases track retention and burn multiple directly.
From the Golden Section mistakes list, each paired with the play that prevents it.
The score only means something when it is benchmarked consistently over time with a stated definition.
Chasing the growth half of the score on weak unit economics breaks the business faster.
Plans that promise to reach 40 through future acceleration rarely do.
In the order we would run them. Each is on its own page, most with a free Excel template.
Gets the margin half of the score right, line by line.
Defines growth and retention consistently against benchmarks.
Shows whether the growth half is buying customers that pay back.
Keeps the score and its drivers in front of the team monthly.
Tells you what score your intended buyer underwrites.
The Balanced Path Its growth, retention and EBITDA benchmarks give the Rule of 40 its practical targets for a smaller company.
Our portfolio path is 10% net profit first, then 20%, with a 20%+ EBITDA margin as the benchmark at $10M ARR and above. At full maturity a company with 80% gross margin and 95% gross retention can sustain far higher cash-flow margins; one below those levels should plan for 25% to 35%.
Positive and rising between $3M and $8M in annual revenue, and 20% or more at $10M and above. What makes a margin good is that it survives when growth spend is removed, which is a retention question as much as a cost question.
It matters as a direction and less as a threshold. Below about $10M, growth and margin swing enough that one quarter can move the score 20 points, so read it on a trailing basis. It becomes a threshold when you prepare for an exit, because buyers price it.
Our equity work moves companies toward a score buyers pay for, through net profit to 10% and then 20% while growth holds. A founder chasing the score with cuts that damage retention is solving the wrong problem, and capital will not fix it.
Growth equity →Reviewed by Dougal Cameron, CEO & Co-Founder on 2026-09-23. Golden Section observations are labeled separately from external benchmarks and illustrative arithmetic.