What's Your Number?

What a CFO listens for on a first call

By Chad Kalebic, CFO, Propeller 

Every founder I talk to has a number.

Typically it's ARR. Sometimes it's payment volume or contract value. It’s the number they run the business on, and it's on the first slide of the investor deck. 

Their number is rarely GAAP revenue. 

I'm a CFO at Propeller, and most of my clients are SaaS and tech companies. I also sit in on a lot of first calls with tech founders who are shopping for a “fractional CFO” and deciding whether they need us. After enough of these calls, I’ve started listening for what people don’t say. 

The number you run on, and the number that gets tested

ARR is a good number: it shows how the business is trending, and investors use it to compare you to every other company in their pipeline. I'd never tell a founder to stop using it. But it doesn’t tell the whole story, much less the most accurate one.

But auditors, lenders, and diligence teams test GAAP revenue. When your number and GAAP don't connect, and nobody can explain why, you have a number you can't defend. In tech, this disconnect usually hides in deferred revenue that doesn't match the billing system, or in an ARR figure that your board deck and your model define in two different ways. Usage-based revenue is another common hiding spot: it often gets added to ARR and can look recurring, even though it might drop the next month.

Here’s how the disconnect shows up across tech under different names.

The pressure on that number is going up. More than 60% of venture dollars raised on Carta in Q1 2026 went to AI companies, so many tech founders now get measured against an AI growth story.

Getting GAAP right is your foundation, as any good accounting team knows. The advice lives in the bridge between your number and GAAP. You need to know why the two differ, and you need to be able to explain it to your investors before someone outside the company checks.

What I'm listening for

On every first call with a client, I'm trying to answer three questions.

Why now? With tech companies, it's usually a capital event that brings them. According to Charles River Ventures, an upcoming raise is the clearest signal that a company needs a CFO, because diligence exposes weak numbers when you’re in a crunch to fix them. Other reasons companies come to us for CFO guidance include a first audit, a finance lead leaving, or a pricing change.

What's broken? Usually it’s one number: revenue that doesn't tie out, for example, or a model the board has stopped trusting. Once we find that number, the rest of the conversation hangs off it.

What does waiting cost you? In a lot of businesses, waiting might mean a slower close and some late nights. For a venture-backed tech company, it can cost you the round, or leverage in your cap table. The raise might slip or close at a lower valuation. Sometimes an audit finding lands in front of investors.

What founders say, and what I ask next

Founders rarely open a call by naming the problem. It comes out in throwaway sentences.

When a founder tells me they just moved to usage-based pricing, I can usually guess what's about to get harder in their revenue recognition and their forecast. These questions come from watching the same situations play out across 1,500+ current and alumni clients.

When to hire a CFO: a tale of two founders

I've met some version of these two founders many times. Here’s how each one goes about looking for a CFO. 

Founder A: the calm one

Their company makes B2B software for mid-market logistics teams, they have about $12 million in ARR, and they’re growing a bit over 40%. They moved to a platform fee plus usage model this year. Series B is planned for the first half of next year, and investors are already making intros. They have a bookkeeper and an outside tax firm, and “honestly, our numbers are pretty clean.” The board has been asking for better cohort reporting, so the CEO has been building it in spreadsheets on weekends. “Mostly I want to understand what a fractional CFO would do for us before the raise.”

Nothing in that sounds like a problem. To me, though, it sounds like diligence is about six months out. “Clean” by a bookkeeper's standard won't be the standard that diligence uses. Usage revenue is probably sitting inside that $12 million number, and nobody has built the bridge to GAAP. The CEO is exposed with the board, and knows it. 

My question: “How does your ARR connect to GAAP revenue, and has anyone tested it?” This founder needs a CFO in the room before the raise. Brian Roberts of a16z advises companies to measure your current finance leader against what your company will need over the next six to twelve months. He also warns that delaying the decision can feel safe, but carries a hidden cost in the form of missed opportunities. (Propeller tip: hiring an embedded CFO is way less time-consuming than searching for the right FTE).

As for “what a fractional CFO would do for a tech company at this stage”: the title undersells what a Series B needs. At Propeller, the CFO comes with an embedded team that's already inside the numbers when diligence starts, and that team builds the bridge from ARR to GAAP before an investor asks for it.

Founder B: the stressed one

They run an AI startup building computer-vision tools for construction sites. They closed about $6 million in seed funding this spring and have a few pilots, maybe $800K in revenue this year. The books are a mess. The founder has been doing everything in QuickBooks, bills are piling up, and the co-founder keeps asking where the money's going. Fundraising isn't on the radar until they have more customers.

Founder B sounds like the one in trouble, and it’s true, they do need help fast: clean books and someone to keep them clean. Their next raise will want buttoned-up financials, though, so cleanup done now is diligence prep for the Series A. 

My question: “When you raise your Series A, what will investors want to see in your numbers?” The CFO conversation happens when that raise comes into view.

Does your tech startup need a CFO?

The calm founder needs a CFO more than the stressed one, which just goes to show you that how you feel about your accounting isn’t a reflection of how prepared your company is to grow, and whether you need CFO guidance ASAP or 18 months from now. If you’re a tech or SaaS founder, here are the questions you should be asking:

• Is a raise, audit, or diligence process on your calendar in the next 12 months?
• Can you bridge from your headline number to GAAP revenue, and has anyone outside the company checked the math?
• Is your board asking a question you can't answer yet?
• Did you change your pricing this year?
• Is anyone building your forecast for the next 18 months?
• Is your finance seat empty, or about to be?

So: what's your number?

If you’re a new client, this is the first thing I want to know about you. Then, I want to know why it differs from GAAP, and whether it'll hold up when someone checks. At Propeller, we start by getting the books right. As an embedded finance partner we know which questions come next, because we've seen it unfold over 18 years and 1,500+ companies.

If you're not sure whether your number would survive diligence, let's talk before someone else asks. Learn more about our embedded teams for high-growth software and technology companies, or schedule a free consultation.

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Frequestly asked questions about fractional CFOs, ARR and diligence

What does a fractional CFO do for a SaaS/tech company?

For a SaaS company, the CFO's first job is usually the bridge between ARR and GAAP revenue, along with the forecast and board reporting that depend on it. At Propeller, the CFO works with an embedded team that keeps the books, so the person advising you is working from numbers they trust. That matters most in the months before a raise.

When should a tech company hire a CFO?

Usually when a raise or diligence process comes into view. A board asking questions the CEO can't answer is another signal, and so is a pricing change. If your books are messy and nothing is on the calendar yet, start with cleanup and plan for CFO support before your next raise.

How does ARR tie to GAAP revenue?

ARR is an operating metric: your recurring revenue, annualized, at a point in time. GAAP revenue is recognized as it's earned under ASC 606, so prepayments sit in deferred revenue and usage is recognized as customers use it. The bridge between the two should reconcile to your billing system, and someone outside the company should be able to follow it.

What do investors check in financial due diligence?

For a Series B tech or SaaS company, expect them to test revenue first. They'll look at whether ARR ties to GAAP, how you recognize usage and multi-year contracts, and whether deferred revenue matches billing. Cohort retention, burn and forecast accuracy usually come next.

What's the difference between a bookkeeper and a CFO?

A bookkeeper records what already happened. A CFO uses those records to plan what happens next, from the forecast to the raise. Good books come first for both, which is why Propeller's CFOs work alongside an accounting team instead of advising from someone else's books.