Home ›
Faq ›
What Is Zombie MRR in SaaS?
What Is Zombie MRR in SaaS?
Zombie MRR is subscription revenue from customers who are paying — every month — but have effectively abandoned the product. They haven't logged in. They haven't opened a support ticket. They're paying out of inertia, forgetfulness, or because cancellation is too hard. For SaaS acquirers, zombie MRR is dangerous because it inflates both MRR and implied retention rates. When those zombies finally cancel — and they will — the churn rate spikes and the buyer absorbs the decay.
Deeper context: What Is Zombie MRR in SaaS
This question — 'What Is Zombie MRR in SaaS?' — is one of the most common questions a SaaS acquirer asks during diligence, and the answer a seller provides is almost always simpler than the underlying reality. The short answer is a useful starting point, but a buyer making a seven-or-eight-figure decision needs to understand why the answer is what it is, what assumptions are baked into it, and how it changes under different definitions.
The deeper truth is that any single-number answer to this question hides more than it reveals. The right answer depends on the target's customer segment (SMB vs mid-market vs enterprise), pricing model (monthly vs annual, seat-based vs usage-based), cohort vintage (are newer customers retaining better or worse than older ones?), and the definitional choices the seller made when computing the number they put in the data room. A benchmark range is a sanity check — the reconstruction from the revenue ledger is the actual diligence.
When you encounter this question in a live deal, the workflow is: (1) get the benchmark range to establish what 'good' looks like, (2) request the revenue ledger and recompute the metric under a standardized definition, (3) segment by cohort and customer type to find the variance behind the blended number, and (4) compare the reconstructed figure to the seller's reported figure. The gap — and in our experience there is almost always a gap — is the diligence finding.