Rule of 40 vs. Burn Multiple: The Rule of 40 measures the sum of revenue growth rate and EBITDA margin, with 40% considered the benchmark for healthy SaaS economics. Burn Multiple measures net burn divided by net new ARR. In 2026, PE investors and strategic buyers are weighting Burn Multiple more heavily as a signal of capital efficiency discipline.
Frequently Asked Questions
What’s the Rule of 40 formula and how do PE investors use it?
Rule of 40 = revenue growth rate + EBITDA margin %. Investors target 40+ as the efficiency threshold. PE portfolios optimize this by balancing growth investment with margin expansion.
Should PE portfolios target growth or profitability first?
Start with NRR stabilization and unit economics. Growth funded through improved retention and expansion outpaces new logo acquisition and carries lower risk.
Key Takeaways
- Net Revenue Retention — NRR measures how much existing customers increase spending annually, critical for SaaS unit economics.
- Annual Recurring Revenue — ARR provides predictable revenue foundation for SaaS financial planning and valuation multiples.
- Rule of 40 — Rule of 40 combines growth rate and profit margin as indicator of SaaS company maturity and health.
- Expansion Revenue — Expansion revenue from upsells and cross-sells extends customer LTV and improves unit economics.
How does Rule of 40 differ between Series C and PortCo stages?
Early-stage prioritizes growth; PortCos optimize the ratio toward profitability. For hold period exits, EBITDA margin becomes the dominant variable.
