The Rule of 40 for SaaS Businesses

For a very long time, the golden advice to any SaaS founder was: grow fast, the profits will come later.

That advice has expired. If you are raising now, planning an exit, or simply wondering why your valuation is not what you imagined, you need to know there is a benchmark in this market called the Rule of 40.

In today’s market, growth without efficiency is no longer an advantage. So what is the Rule of 40?

The concept is very simple, and slightly deceptive. The rule says: add your annual revenue growth rate to your profit margin, and the result must equal 40% or more.

Growth % + Profit % ≥ 40%

That equation forces hard trade-offs, and it splits companies into two types:

Rocket companies. If you are growing 100% a year, an investor can accept a profit margin of −60% — you are burning cash. Because 100 − 60 = 40. You are safe.

Steady companies. If your growth has slowed to 10%, you need a 30% profit margin to stay attractive. Because 10 + 30 = 40.

If you are growing 20% and losing 10% — a total of 10 — you are burning money without the growth rate that would justify the burn.

Why does this change the valuation?

The market is not being generous right now. Companies that break the 40% barrier take excellent valuations. Companies that fail it face a valuation discount of 25% to 40%, regardless of their technology or how good the team is.

Investors have stopped paying for revenue that arrives at an unsustainable cost.

So what do I do to improve against the Rule of 40?

If you have run your numbers and found yourself under 40, there are three things to work on.

Net revenue retention

Churn is enemy number one. Whoever comes in should not leave. The cost of replacing lost income is very high.

Strong software companies target between 115% and 120%. That means even if you add no new customers at all, your business grows 15–20% simply by selling more services or higher tiers to the customers you already have. If that number is below 100%, you have a problem.

Break the link between headcount and revenue

Historically, to increase sales you hired more salespeople. To serve more customers, you hired more support. Now the smart companies use AI and automation to break that rule.

We are seeing companies target gross margins of 60–70% by making a great deal happen automatically. If you can double your revenue while increasing headcount by only 10%, your valuation goes to the sky.

Before the new financial year

Calculate your result in this equation. If you are under 40, you have a decisive choice in front of you: either find a way to accelerate growth without increasing costs, or reduce costs to protect your profit.

I work with companies, founders, product managers, government entities and experts across the Middle East and North Africa to build and grow SaaS and AI products. I share practical thinking, frameworks and real lessons from the ground here, free, on how to build AI-supported SaaS with genuine impact in our region.

And if you need deeper work, I provide advisory and training services to help teams build the right product for the right audience in the right context.