Key takeaways
- MRR shows the size and direction of the business.
- Churn shows whether customers stay.
- Gross margin shows whether each sale is worth making.
- CAC payback shows how long it takes to earn back the cost of winning a customer.
- Runway shows how long you can keep going.
Why a finance view matters
SaaS dashboards are full of numbers. A finance person narrows them down to the few that predict whether the business will still be standing in two years. These five are where I start with any SaaS product.
1. Monthly recurring revenue (MRR)
MRR is the total subscription revenue you can expect every month, with annual plans divided by 12.
Track it in four parts, not just one total:
- New MRR from new customers;
- Expansion MRR from upgrades;
- Contraction MRR from downgrades;
- Churned MRR from cancellations.
A flat total can hide strong sales and heavy cancellations cancelling each other out.
2. Churn
Customer churn = customers lost in the month ÷ customers at the start of the month.
Revenue churn does the same with MRR. Revenue churn matters more, because losing one large customer hurts more than losing several small ones. If expansion from existing customers exceeds churn, you have net negative churn, which is the healthiest sign a SaaS business can show.
3. Gross margin
Gross margin = (revenue − cost of delivering the service) ÷ revenue.
Cost of delivery includes hosting, third-party APIs (including AI model usage), payment fees and customer support. AI features can quietly push this cost up, so measure it per customer and per plan.
4. CAC payback
Customer acquisition cost (CAC) = sales and marketing spend ÷ new customers won.
CAC payback (months) = CAC ÷ (monthly revenue per customer × gross margin).
The shorter the payback, the faster growth pays for itself. A long payback means every new customer drains cash for months before contributing.
5. Cash runway
Runway (months) = cash in the bank ÷ average monthly net burn.
Use the burn after collections, not the profit and loss figure. Annual plans paid upfront improve cash even when MRR is unchanged — which is one reason to offer them.
Putting it together
Review these five every month on one page. When one moves the wrong way, it usually tells you where to look next: churn points to product or onboarding, margin to hosting and API costs, payback to sales and marketing.
FAQ
Is revenue growth enough to judge a SaaS business?
No. Growth with high churn or a long CAC payback can burn cash faster than it creates value. Look at growth together with churn, margin and payback.
How often should these numbers be reviewed?
Monthly for MRR, churn and cash; quarterly for gross margin and CAC payback, once there is enough data to be meaningful.
About the author
Zubair Akbar
Chartered Accountant, Group CFO and FTA-approved Tax Agent (TAAN 20059440) with 16+ years in audit, tax and finance across the UAE and Pakistan.
More about Zubair →