ARR Waterfall

What an ARR Waterfall Is

An ARR waterfall — also called an ARR bridge — is a structured decomposition of how annual recurring revenue changed over a period, broken into four labeled buckets: new ARR from net-new logos, expansion ARR from existing customers buying more, contraction ARR from customers downgrading, and churned ARR from customers who canceled entirely. The waterfall starts with beginning-of-period ARR, applies each movement sequentially, and lands on ending ARR. It is the closest instrument SaaS has to a standardized income statement for revenue quality — and it exposes things a single ARR growth number never would.

How an ARR Waterfall Is Built

The arithmetic is additive:

Ending ARR = Beginning ARR + New ARR + Expansion ARR − Contraction ARR − Churned ARR

Each bucket maps to a distinct motion in the business:

When Expansion ARR exceeds Churned ARR, the company achieves net negative churn — the existing customer base alone grows total ARR, even if new logo sales stop entirely.

Worked ARR Waterfall Example

A SaaS company starts Q2 with $10,000,000 ARR:

Net ARR growth for the quarter: $850,000. Net revenue retention from the existing base (excluding new ARR): $10,050,000 / $10,000,000 = 100.5%. The base is growing without new logos. That's a different business than one that posted $850,000 of net ARR growth through $2M of new ARR offset by $1.15M of combined churn and contraction — same ending number, opposite unit economics.

Who Uses the ARR Waterfall

The waterfall is standard for board reporting in venture-backed SaaS. Investors use it to separate growth efficiency from gross momentum: a company growing 40% YoY through high new ARR masked by rising churn is a much riskier investment than one growing 25% with stable retention. The waterfall makes that distinction visible in a single slide.

RevOps builds the waterfall from CRM and billing system data. Finance presents it. The VP of Sales owns the New ARR line and defends it. The VP of Customer Success owns the Contraction and Churned lines and sweats both. When contraction ARR spikes, the board asks why. The answer almost always traces to either a weak customer health score system that missed risk signals, or to sales closing customers who were wrong-fit to begin with — misaligned ICP, oversold capability, underpriced for the value they'd extract.

CFOs love the waterfall because it connects revenue movements to team accountability. There is no ambiguity about who owns which line.

What the ARR Waterfall Doesn't Reveal — and How It Gets Gamed

The waterfall shows amounts, not causes. $400,000 of expansion ARR is a single number — it doesn't distinguish between an account executive who earned a cross-sell through rigorous land-and-expand execution and a renewal manager who got lucky with a reorg that automatically added seats. Attribution at the expansion line is aggressively politicized in organizations where CS and Sales both claim credit for the same dollar.

Contraction ARR is the most frequently manipulated bucket. The exploit: renewing an at-risk account at a discounted rate rather than allowing a formal downgrade event. A $100,000 account renewed at $70,000 should register $30,000 of contraction ARR. Many RevOps teams instead record it as $100,000 renewed (no contraction) with a $30,000 "retention discount" buried in a non-ARR budget line. The waterfall looks clean. Gross revenue retention is the cross-check — if GRR and the waterfall's contraction line are moving in opposite directions, something is being reclassified.

A second pattern: new ARR inflation via placeholder contracts. Deals signed December 31 for $1 of contract value to register a logo in Q4, with the real subscription commencing January 1, inflate the new ARR bucket for Q4 and the expansion bucket for Q1. Boards that read only the waterfall totals miss it entirely. The fix is reconciling new ARR amounts against actual go-live dates — a hygiene check few companies run consistently.