SaaS Business Model

Selling software as a recurring subscription, and why investors value it.

Also known as: SaaS, software as a service, subscription software

SaaS sells software as an ongoing subscription instead of a one-time license: customers pay monthly or yearly for access, and revenue recurs as long as they stay. The model compounds — each month’s new sales stack on top of retained old ones — which is why growing SaaS revenue is so valuable and why churn is its mortal enemy.

license (old):  $10k once → hunt the next deal forever
SaaS:           $500/mo × retained customers → revenue stacks month after month

The model’s health is read in a small dashboard: MRR growth, churn, expansion, CAC payback. Together they say whether growth pays for itself. Investors prize SaaS because contracted recurring revenue is plannable in a way project income never is.

The classic mistakes:

Subscription pricing on something bought once. Recurring billing needs recurring value — ongoing use, fresh content, managed operations. Charging monthly for a static tool invites cancellations.
Ignoring the retention half. Teams celebrate new logos while churn quietly eats them. A SaaS business with 5% monthly churn must replace half its base yearly just to stand still.
Pricing below the cost to serve. Support-heavy products at $19/month lose money per customer forever. Price against fully-loaded cost, not hosting cost.
Annual contracts as the only retention plan. Lock-in delays churn; it does not prevent it. The product must earn renewal every month regardless of billing frequency.

When SaaS fits: ongoing value, reachable buyers in volume, and unit economics where lifetime value comfortably exceeds acquisition cost (see LTV:CAC). Otherwise consider transactions, services or one-time sales honestly.