Deep Dive: Free Cash Flow Explained — Why It Matters More Than Earnings
Wall Street fixates on earnings per share. Analysts build models around net income. Headlines scream about earnings beats and misses. But the most sophisticated investors — from Warren Buffett to private equity titans — have long argued that a different number matters more: free cash flow. Free cash flow strips away the accounting abstractions that cloud net income and answers a deceptively simple question: how much actual cash did this business generate after keeping the lights on and the factories running? It is the money available to pay dividends, buy back shares, reduce debt, or fund acquisitions — the real fuel for shareholder returns. In 2025, Apple generated $98.8 billion in free cash flow while reporting $112 billion in net income. Microsoft produced $71.6 billion in FCF against $101.8 billion in earnings. The gaps are enormous, and understanding why they exist is essential to evaluating any stock. This guide breaks down what free cash flow is, how to calculate it, why it diverges from earnings, and how to use it to compare companies across industries — from asset-light payment networks like Visa to capital-hungry tech giants like Alphabet and Amazon.