Does Rule of 40 use EBITDA margin or net margin?

Most commonly EBITDA margin or free cash flow margin. Net margin includes one-time items and taxes that distort the operational view. EBITDA-based Rule of 40 is the standard.

Is Rule of 40 applicable to non-SaaS businesses?

It was designed for SaaS but is increasingly applied to other recurring-revenue models (consumer subscriptions, marketplaces with predictable take rate). It's less applicable to one-time-revenue or hardware businesses.

What if growth is high but margin is very negative?

Companies in heavy investment mode (e.g., growing 100% but losing 80% margin = score 20) underperform on Rule of 40. This is typically acceptable in years 1-3 but signals problems if it persists past ₹50Cr ARR.

Glossary

Rule of 40

Name: AletheiaAI
Author: Amit Tyagi

A SaaS health metric — growth rate + profit margin should sum to at least 40% for healthy SaaS companies at scale.

By Amit Tyagi, Fitoor Capital · AletheiaAI Glossary

Definition

Rule of 40 is a SaaS health metric stating that the sum of a company's growth rate and profit margin should equal or exceed 40%. It's used to evaluate the trade-off between growth and profitability.

Formula: Growth Rate (%) + Profit Margin (%) ≥ 40%. A company growing 60% and losing 20% margin still hits Rule of 40 (60 + (-20) = 40). A company growing 25% with 15% profit margin also hits 40.

Best-in-class SaaS companies hit Rule of 50 or Rule of 60. Public SaaS multiples correlate strongly with Rule of 40 score — companies above 40 trade at premium ARR multiples.

India Context

Indian SaaS investors in 2026 use Rule of 40 as the primary Series B and growth-stage health check. At Series B (₹25-75Cr ARR), Indian SaaS companies hitting Rule of 40 raise at premium 10-15x ARR multiples. Companies below 40 raise at 4-7x ARR or struggle to close at all.

At earlier stages (seed, Series A), Rule of 40 is less applicable because high growth often comes with large losses. The metric becomes meaningful around ₹15-25Cr ARR.

Example

An Indian B2B SaaS at ₹40Cr ARR is growing 50% YoY with an EBITDA margin of -5% (slight loss). Rule of 40 score = 50 + (-5) = 45. Above 40 — healthy. The same company growing 40% but with -10% margin = score 30, below the threshold.

Frequently Asked Questions

Related Terms

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Unit Economics

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