Headline revenue growth can hide serious problems. Growth accounting decomposes that number into components — revealing whether growth is healthy, sustainable, and efficient.

The Growth Accounting Equation

Net Revenue Growth = New Revenue + Expansion Revenue - Contraction Revenue - Churned Revenue

Each component tells a different story about your business.

The Components

New Revenue (New MRR)

Revenue from new customers. This is the output of your acquisition engine.

Questions it answers:

• Is our acquisition machine working?
• Are we bringing in enough new customers?
• What's our average starting MRR?

Expansion Revenue (Expansion MRR)

Revenue growth from existing customers through upgrades, upsells, and usage increases.

Questions it answers:

• Are customers getting more value over time?
• Is our product sticky?
• Is our land-and-expand strategy working?

Contraction Revenue (Contraction MRR)

Revenue decline from existing customers through downgrades and reduced usage.

Questions it answers:

• Are customers finding less value?
• Is economic pressure affecting us?
• Are there product or service issues?

Churned Revenue (Churned MRR)

Revenue lost from customers who leave entirely.

Questions it answers:

• Why are customers leaving?
• Is churn concentrated in certain segments?
• What's our net revenue retention?

Net Revenue Retention (NRR)

NRR = (Starting MRR + Expansion - Contraction - Churn) / Starting MRR

The most important metric in SaaS.

• NRR > 100%: You're growing even without new customers
• NRR = 100%: Flat; need new customers to grow
• NRR < 100%: Leaky bucket; acquisition can't outrun churn

Best-in-class SaaS: 120-140% NRR

Logo Retention vs. Revenue Retention

Logo retention counts customers. Revenue retention counts dollars.

A company can have:

• 90% logo retention (10% of customers churn)
• 95% revenue retention (small customers churn more)
• 110% net revenue retention (expansion offsets churn)

Logo retention matters for understanding customer satisfaction. Revenue retention matters for understanding business health.

Visualizing Growth Accounting

The Waterfall Chart

• Start with beginning MRR
• Add new MRR (green)
• Add expansion MRR (green)
• Subtract contraction MRR (red)
• Subtract churned MRR (red)
• End with ending MRR

This visualization makes the components instantly clear.

The Cohort Revenue Curve

Plot monthly revenue from each customer cohort over time. Curves that flatten are retaining. Curves that increase are expanding. Curves that decline are churning.

Using Growth Accounting for Decisions

Acquisition vs. Retention Investment

If NRR > 100%, doubling down on acquisition is efficient — every new dollar keeps growing. If NRR < 100%, fix retention first — you're filling a leaky bucket.

Diagnosing Problems

• High churn + Low expansion = Product value problem
• High contraction + Low churn = Pricing or packaging problem
• Low new MRR + Healthy retention = Acquisition bottleneck

Forecasting

Growth accounting enables bottoms-up forecasting:

• Project new MRR from pipeline
• Apply historical retention rates to existing base
• Model expansion based on customer maturity

Segment-Level Analysis

Overall growth accounting hides segment dynamics. Break down by:

• Customer size (SMB, Mid-Market, Enterprise)
• Vertical or industry
• Product/plan
• Acquisition channel
• Cohort (signup month)

Different segments often have dramatically different retention profiles.

Common Mistakes

Focusing only on net growth: Healthy net can hide unhealthy components.

Ignoring contraction: Contraction is churn in slow motion.

Celebrating expansion from price increases: Not all expansion is earned.

Treating all churn equally: Voluntary vs. involuntary churn have different causes and fixes.

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Growth accounting turns a single number (revenue growth) into a diagnostic story. Every component is a lever. Understanding which levers are working — and which aren't — is the foundation of growth strategy.