CAC Payback by Segment and Cash Conversion Score
When you need this method
You measure an aggregate CAC payback and do not know whether it is good or bad. Without segment context the number is barely interpretable: an enterprise business may pay back more slowly than a self-service one. The level above is often missing too: how efficiently does the company as a whole turn raised capital into recurring revenue?
Approach
- 1Calculate CAC payback separately per segment (SMB, mid-market, enterprise) on a gross-margin basis.
- 2Compare against the segment thresholds: under 12, 18 and 24 months respectively.
- 3Calculate the cash conversion score: current ARR divided by total capital raised (net of cash).
- 4Classify the score: 0.25 to 0.5 solid, 0.5 to 1.0 good, above 1.0 outstanding.
- 5Use both levels together: segment payback steers the motion, the score disciplines capital allocation.
Typical application
A typical case: a vendor serves small customers via self-service and large accounts via field sales but reports only a blended payback. The blended figure looks unremarkable yet hides that the SMB segment badly misses its threshold while enterprise is healthy. After separating the segments, SMB onboarding is automated and sales effort there reduced. In parallel, the cash conversion score shows investors that the company converts raised capital into ARR with above-average efficiency.
Limits and counter-indications
The thresholds are benchmark conventions from a VC-shaped environment, not a guarantee of a healthy business. The cash conversion score structurally penalizes capital-intensive models and speaks only to past efficiency, not the future. Small segments produce volatile paybacks; trend over single values.
How to measure impact
CAC payback in months per segment against the 12/18/24 thresholds, plus the cash conversion score as a capital-efficiency measure.
Related methods
Sources
- 1.Gordon, Myron J.: The Payoff Period and the Rate of Profit. The Journal of Business 28(4), 1955, S. 253–260 (opens in a new tab) · 1955 · academic and scholarly literature · supports the underlying mechanismThe reciprocal of the payoff period estimates a proposal's rate of profit, most accurately when the proposal's life exceeds its after-tax payoff period, the reason a recovery period works as a measure of return at all.
- 2.Scaling to $100 Million, Bessemer Venture Partners (BVP Atlas) (opens in a new tab) · Bessemer Venture Partners · BVP Atlas, n.d. · investment, consulting and analyst firms, industry bodies and public agencies · provides benchmark figuresStates the segment-dependent targets verbatim: under twelve months for small customers, under eighteen in mid-market, under twenty-four in enterprise.
- 3.Cash Conversion Score, Bessemer Venture Partners (BVP Atlas) (opens in a new tab) · Bessemer Venture Partners · BVP Atlas, n.d. · investment, consulting and analyst firms, industry bodies and public agencies · describes the methodDefines the capital efficiency metric as annual recurring revenue divided by equity and debt raised less cash on hand, with bands of 0.25 to 0.5, 0.5 to 1.0 and above 1.0. The bands are Bessemer's own convention, not an industry-wide measured distribution.
- 4.Navigating Unpredictability: Introducing the Resiliency Rubric for SaaS Companies (2023), ICONIQ Growth (opens in a new tab) · ICONIQ Growth · 2023 · investment, consulting and analyst firms, industry bodies and public agencies · provides benchmark figuresRuns CAC payback as one of five diagnostics and calculates it explicitly on a gross-margin basis, sales and marketing expenses in the period divided by gross new customers times ARPU, multiplied by gross margin. Under twelve months counts as exceptional. It does not break the figure down by customer segment; for the current environment it reports 20 to 30 months.
- 5.Weingartner, H. Martin: Some New Views on the Payback Period and Capital Budgeting Decisions. Management Science 15(12), 1969, S. B594–B607 (opens in a new tab) · 1969 · academic and scholarly literature · supports the underlying mechanismAnalyses payback both as an investment criterion and as a liquidity constraint, and as a device for handling uncertainty about project life, which is what justifies differentiated allowable periods across segments.
- 6.Dwyer, F. Robert: Customer Lifetime Valuation to Support Marketing Decision Making. Journal of Direct Marketing 3(4), 1989, S. 8–15 (opens in a new tab) · 1989 · academic and scholarly literature · supports the underlying mechanismEstablishes lifetime value as the basis for budgeting customer acquisition programmes and separates estimation approaches by relationship type (retention vs. migration).
Origin: Bessemer
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