Free Cash Flow: Why It's the Most Honest Measure of Business Health
Free cash flow is harder to manipulate than earnings, more complete than EBITDA, and the metric that actually matters for long-term valuation. Here's how to calculate it and what it reveals.
Why FCF Is the Gold Standard Metric
Revenue can be accelerated through aggressive discounting. Earnings can be smoothed through accounting choices. EBITDA ignores capital spending. But free cash flow — actual cash generated after maintaining and investing in operations — is the hardest metric to manipulate. Cash either comes in or it doesn't. Warren Buffett has described "owner earnings" as the only metric that truly matters for valuing a business. Calculate your FCF with our free cash flow calculator.
How Free Cash Flow Is Calculated
FCF = Operating Cash Flow − Capital Expenditures. Operating cash flow starts with net income and adjusts for non-cash charges (depreciation, amortisation) and working capital movements (changes in AR, AP, inventory). Capex is subtracted because it represents cash spent to maintain or expand the asset base — a real cost, even though accounting depreciation spreads it over multiple years.
Why FCF Differs from Net Profit
Non-cash charges: A company with $5M net income and $2M depreciation generates $7M operating cash flow before working capital — FCF is higher than net income. Working capital timing: Fast-growing companies see AR growing faster than revenue, making net income look better than FCF. SaaS companies collecting annual subscriptions upfront build deferred revenue, making FCF look better than net income. Capital expenditures: Heavy capex investment shows strong earnings but weak FCF — particularly relevant for capital-intensive businesses.
FCF Margin Benchmarks for SaaS
- 20%+ FCF margin: Exceptional — top-tier SaaS businesses at scale
- 10–20%: Healthy — most profitable public SaaS companies
- 0–10%: Positive but thin — acceptable while scaling
- Negative FCF: Common for growth-stage SaaS; requires external funding
SaaS and the FCF Advantage
SaaS businesses have a structural FCF advantage: minimal physical assets mean low capex, so EBITDA and FCF stay close. Annual billing SaaS also collects cash before recognising revenue — creating deferred revenue that makes FCF systematically higher than net income during growth. A SaaS company with $10M in negative net income might simultaneously generate positive FCF due to annual prepayments, low capex, and non-cash charges. This is why investors in growth-stage SaaS focus on FCF rather than GAAP earnings.