The SaaS "Leaky Bucket" Phenomenon
Projecting SaaS revenue isn't just about how many new customers you can acquire. It's about the relationship between your Monthly Gross Growth Rate and your Gross Churn.
What is a Good Growth Rate?
In the current market, venture capital expectations have shifted toward sustainable growth. However, high-growth paths still dictate milestones for ambitious startups:
- Early Stage: 15-20% month-over-month gross growth is often targeted.
- Growth Stage: 100%+ year-over-year gross growth remains a strong signal.
- Mature SaaS: 30-40% year-over-year gross growth aligns with Rule of 40 benchmarks.
Why Churn is the Silent Killer
A 5% monthly churn rate might seem small, but it means you lose 46% of your customers every year. To simply stay flat, you have to replace nearly half your business annually. This makes "Negative Churn" (where expansion revenue from existing customers outweighs lost revenue) the holy grail of SaaS unit economics.
Strategic Insight: ARR vs. MRR
While MRR helps you manage day-to-day operations, Annual Recurring Revenue (ARR) is the metric used for valuation. Most SaaS companies are valued at a multiple of their year-end ARR.