Cash Flow Trough
When you need this method
You plan to raise the growth rate and expect your cash balance to carry it. In a subscription model, more growth initially deepens the capital need rather than covering it: every additional customer costs money today and pays back over months. Without a modeled trough you hit a liquidity gap mid-scale or lose your investors' confidence.
Approach
- 1Model the cash curve of a single customer: acquisition cost today, recurring contribution over the lifetime.
- 2Aggregate these curves for the planned pace of new customers over several years.
- 3Determine the depth and timing of the cash trough and the point where cash flow turns positive.
- 4Check the trough against runway and financing capacity, including higher-pace scenarios.
- 5Use the model actively in conversations with investors so the investment level is jointly supported.
Typical application
A typical case: a software vendor with a working sales machine wants to raise its new-customer rate substantially. The simple planning logic of "more customers equals more cash" misses that each new customer only turns cumulatively positive after many months. The team models the trough for several growth scenarios and finds the most aggressive one overruns the runway. It picks a pace whose trough the existing financing can carry and lays out the capital need for the next stage.
Limits and counter-indications
The model is only as good as the assumptions on churn, payback and sales productivity; young companies should work with ranges. It does not answer whether the growth is strategically right, only whether it is financeable. With highly variable deal sizes, cohort modeling is needed instead of an average customer.
How to measure impact
Maximum depth of the cumulative cash trough and the month cumulative cash flow turns positive, per growth scenario.
Related methods
Sources
- 1.SaaS Economics · Part 1: The SaaS Cash Flow Trough, David Skok (forEntrepreneurs) (opens in a new tab) · forEntrepreneurs · o. J. · practitioner sourceBenennt und quantifiziert das Cash-Flow-Tal als Folge der Vorleistung im Vertrieb und weist Tiefe des Tals sowie Monate bis zur Rückgewinnung an einem durchgerechneten Fall aus.
- 2.SaaS Metrics 2.0 · A Guide to Measuring and Improving what Matters, David Skok (forEntrepreneurs) (opens in a new tab) · forEntrepreneurs · o. J. · practitioner sourceTrägt den Kernsatz der Methode, dass ein höheres Tempo bei der Kundengewinnung das Tal vertieft und Wachstumsbeschleunigung mit einem Druck auf Ergebnis und Kassenstand einhergeht.
- 3.Valuing Customers, Gupta, Lehmann & Stuart, Journal of Marketing Research (opens in a new tab) · American Marketing Association / Columbia Business School (Volltext) · 2004 · academic and scholarly literatureStützt die zugrunde liegende Ökonomik, dass vorgezogene Akquisitionsausgaben schnell wachsende Unternehmen rechnerisch verlustreich erscheinen lassen, obwohl Kundenwert aufgebaut wird.
Origin: Skok
Last reviewed: 2026-07-25 by Dr. Oliver Gausmann