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Hey {{first_name}} 👋, hope you had a great week! In the last issue, we discussed why tracking Customer Retention Cost matters, and now we are moving with the next topic from Financial Metrics content.

Let’s talk about ⬇️

Most SaaS founders track cash flow.

Far fewer track free cash flow correctly — and even fewer can speak fluently about why it matters when an investor asks.

But here's the thing: as your company scales toward later-stage rounds or an eventual IPO, free cash flow stops being a back-office metric and becomes one of the most scrutinized numbers on your financials.

Investors don't just want to know how much cash is moving through your business. They want to know how much is actually yours after you've covered everything required to keep the lights on and the engine running.

Today I want to walk you through exactly what FCF is, the multiple ways to calculate it, what "good" looks like for SaaS, and the metric most founders should be tracking alongside it.

Let's dig in:

1️⃣ What Free Cash Flow Actually Measures

2️⃣ The Three Ways to Calculate FCF

3️⃣ Why FCF Matters — From Two Different Angles

4️⃣ Free Cash Flow Margin — The Metric You Should Track Alongside FCF

5️⃣ The Hidden Challenge With FCF

The goal here is to understand how much cash your business has left over after covering everything required to operate.

Free cash flow is the cash remaining after you've paid for operating costs (payroll, rent, software, insurance) and capital expenditures (equipment, infrastructure, technology investments).

What's left over is the cash you can actually deploy strategically — to pay down debt, fund acquisitions, distribute dividends, invest in new product lines, or return capital to shareholders.

Why it matters: Operating cash flow tells you whether your core business generates cash. FCF tells you whether you have any of it left after the cost of running and growing the business. The difference is significant — especially as you mature.

For private SaaS companies, FCF often gets overlooked in favor of ARR and burn metrics. But once you're approaching Series C, late-stage rounds, or an IPO, FCF becomes one of the first numbers investors and lenders zero in on.

The goal here is to use the calculation method that fits the data you have available.

There's no single universal formula — but the methods all converge on roughly the same number. Here are the three most common approaches:

Method 1: The simplest version

Start with operating cash flow from your cash flow statement, subtract CapEx, and you have FCF. This is the cleanest method if your accounting is in order.

Method 2: From net operating profit

Useful if you're working from income statement data and want to back into FCF without relying on a fully built cash flow statement.

Method 3: From the top down

Helpful when modeling forward-looking scenarios — you can flex revenue and cost assumptions to see how FCF responds.

All three should produce roughly the same result. If they don't, that's a signal something in your underlying data is misclassified — and worth investigating before the next board meeting.

I'm Aleksandar, fractional CFO at Fiscallion, where we help founders like you achieve financial clarity, streamline reporting, and build investor-ready forecasts.

Ready to level up your finances?

The goal here is to understand how FCF reads from inside the business vs. from an investor's seat.

These are two very different perspectives, and both matter:

Internally, FCF tells you how much flexibility you actually have. Can you fund a new product line without raising? Can you make an acquisition? Can you weather an unexpected revenue dip without layoffs? Without clear FCF visibility, those decisions get made on instinct rather than data.

Externally, FCF is one of the cleanest signals an investor can use to evaluate financial health. It's harder to manipulate than revenue, more honest than EBITDA, and a direct read on whether your business is generating real economic value.

Here's the nuance most founders miss: FCF doesn't have to be positive to be good. A growth-stage SaaS company strategically investing in expansion might have negative FCF for years — and that can be the right call. What matters is showing investors how the cash is being deployed and what return it's generating.

A company with negative FCF and no clear narrative looks reckless. A company with negative FCF and a clear, measurable strategy looks ambitious. The numbers are the same. The story is everything.

The goal here is to understand how efficiently your business converts revenue into actual cash.

FCF tells you the absolute dollar amount. FCF margin tells you the efficiency:

FCF Margin = (Free Cash Flow ÷ Total Revenue) × 100

A higher margin means more of every revenue dollar is making it through to free cash flow — a sign you're managing operating costs and capital investments efficiently.

For SaaS, here's what "good" looks like:

These benchmarks aren't gospel. A high-growth Series B company won't hit 25% FCF margin and shouldn't try to. A scaled, late-stage SaaS business should be approaching it. Context is everything — but knowing where you stand against these benchmarks is non-negotiable.

Here's something most founders don't realize until they're deep into IPO prep:

FCF doesn't have standardized disclosure requirements.

Unlike GAAP metrics, there's no universal rule for how it must be reported. Which means if you don't proactively break it out and contextualize it, investors and analysts will calculate their own version — and potentially miss the strategic context behind the numbers.

A year-over-year drop in FCF might look concerning at first glance. But it could actually reflect a deliberate acquisition, a major capital investment in infrastructure, or a one-time strategic spend with multi-year payback. Without your narrative attached, the number tells the wrong story.

That's why the strongest finance teams don't just track FCF — they track it in real time, automate the calculations, and build the narrative around it before someone else does.

When you can walk into a board meeting and explain not just what your FCF is but why it's where it is, you stop being on the defensive. You start driving the conversation.

That's the difference between reporting on the past and shaping the future.

Hit reply and tell me: are you currently tracking FCF margin alongside FCF, and how does it compare to the Rule of 40 benchmark for your business? I read every response — and I'm curious how widely the gap varies across SaaS at different stages.

Chat soon,

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