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E35: The Ultimate Guide to Vertical SaaS with Top Investor Dave Yuan of Tidemark

Run the Numbers

NOTE

Payback period, CAC and LTV

In subscription software growth, two key mechanics are the acquisition of new customers versus existing ones, and geographic expansion. The relationship between Customer Acquisition Cost (CAC) and Lifetime Value (LTV) is not fixed but rather a curve that varies based on Net Revenue Retention (NRR) and targeted LTV to CAC ratios. Instead of fixating on specific payback periods—such as six or twelve months—businesses must consider their NRR. For instance, a strong NRR of 120 allows for a CAC payback period of approximately 18 months if the LTV to CAC ratio is five times over five years. This is because a sustainable LTV cannot be infinite. Additionally, in emerging markets, even with lower NRR, there may still be room for longer payback periods if future product developments promise greater returns. Ultimately, the evaluation of CAC payback should be relative to NRR rather than an absolute timeframe; sophisticated investors recognize this complexity and prioritize the situational context of metrics over arbitrary standards.

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