Intuition
Why FCF matters: It's the only metric that shows what cash is actually available to investors after the company has done everything it needs to sustain itself.
- Net income is polluted by non-cash charges, accounting elections, and interest expense specific to capital structure.
- EBITDA ignores the very real cash demands of CapEx and working capital.
- FCF answers the question: "If I bought this entire company today, debt and equity included, how much cash could I pull out each year without destroying the business?"
This is why DCF valuations discount FCF, not earnings. Cash is what ultimately gets distributed to investors.
What FCF Buys You: FCF is optionality. Once generated, management chooses the weapon:
| Use | The Implication |
|---|
| Pay Down Debt | De-risks the balance sheet. Kills interest expense. |
| Dividends | Cash to shareholders. Signals stability (and often maturity). |
| Buybacks | Shrinks share count. Boosts EPS. Tax-efficient. |
| Acquisitions | Fuel for inorganic growth. |
| Reinvest | The flywheel. Compounds future FCF. |
- In an LBO: FCF retires debt. Every dollar repaid flows directly to equity value at exit.
- In a DCF: You discount FCF. It is the intrinsic value. Everything else is noise.
Components
NOPAT: tax-effected operating profit
What It Is: NOPAT (Net Operating Profit After Taxes) is EBIT adjusted for taxes. It isolates the operating profitability of the business independent of capital structure.
NOPAT=EBIT×(1−Tax Rate)
How to Calculate It: Take EBIT directly from the income statement. Multiply by (1 - Tax Rate). Use the marginal tax rate for projections; use effective tax rate if analyzing historical performance.
Key Consideration: We use EBIT, not Net Income, because FCF measures cash available to all capital providers. Interest expense is a financing decision, not an operating one. Including it would double-count the cost of debt when calculating enterprise value.
Depreciation & amortization: the non-cash add-back
What It Is: D&A represents the accounting allocation of past capital expenditures across their useful lives. It reduces reported earnings but involves no actual cash outflow in the current period.
How to Calculate It: Pull D&A from the income statement (often embedded in COGS or SG&A) or from the cash flow statement's operating section. The cash flow statement is more reliable.
Key Consideration: D&A is already subtracted in EBIT. Adding it back converts EBIT from an accrual number toward a cash number. You're reversing the non-cash expense to see true cash generation.
Change in net working capital: the cash timing trap
What It Is: Net Working Capital (NWC) equals operating current assets minus operating current liabilities. The change in NWC captures cash tied up (or released) by day-to-day operations.
NWC=Accounts Receivable+Inventory−Accounts Payable−Accrued Liabilities
How to Calculate It: Compare NWC at the end of the period to NWC at the beginning. An increase in NWC is a cash outflow (subtract it). A decrease is a cash inflow (add it).
Key Consideration: Growing companies often see NWC increase. They're building inventory and extending credit to customers faster than they're collecting. This drains cash even when profits look strong. Negative FCF is often just the cost of funding rapid expansion.
Capital expenditures: investing to stay in business
What It Is: CapEx is cash spent on property, plant & equipment (PP&E) and capitalized intangibles. It represents investment required to maintain and grow the asset base.
How to Calculate It: Use the cash flow statement's investing section. Alternatively, calculate from the balance sheet:
CapEx=Ending PP&E−Beginning PP&E+Depreciation
Key Consideration: CapEx is a real cash outflow, unlike D&A. Analysts distinguish between maintenance CapEx (keeping existing assets operational) and growth CapEx (expanding capacity). In a steady-state DCF, maintenance CapEx roughly equals depreciation. Growth CapEx exceeds it.
DCF Nuance: In Terminal Value, you assume steady-state. Deduct Maintenance CapEx only. If you deduct Growth CapEx forever, you're penalizing the company for optional expansion it wouldn't make in maturity.
How to calculate FCF
Two paths, one destination.
1. The shortcut (from CFO)
FCF=CFO−CapEx
Why: CFO already handles working capital and non-cash items. Just subtract the fixed asset spending.
2. The derivation (from EBIT)
FCF=EBIT×(1−t)+D&A−CapEx−ΔNWC
Why: Transparency. You see every lever.
Unlevered vs. levered FCF
Two flavors. Different owners.
The Trap: If you mix these up in a DCF (e.g., discounting Unlevered FCF by Cost of Equity), the valuation is dead.
EBITDA: the lazy proxy
EBITDA is the quick and dirty proxy for cash, used for speed. It is not FCF.
EBITDA=EBIT+D&A
You add back D&A because those are paper charges. No cash went out the door for them this period. What you land on is the closest number the income statement has to the cash the operation generates. Closest is as far as it goes.
- The Love: It smooths out volatile CapEx cycles, making it easy to compare companies.
- The Hate: It ignores CapEx entirely. A company burning $500M on machinery looks identical to one spending $0.
- The Fix: "EBITDA - Maintenance CapEx" is the true proxy for steady-state cash flow.
FCF yield: the bullshit detector
FCF Yield=Share PriceFCF per Share
- 10% Yield: You get $0.10 of real cash flow for every $1.00 you invest.
- The Signal: High FCF Yield + Low P/E = Value (or a dying business). Earnings can be manipulated; FCF Yield cuts through the accounting fog.
The cash conversion cycle (CCC)
How fast does inventory turn into cash?
CCC=Days Inventory+Days Sales Outstanding−Days Payable
- The Holy Grail: A negative CCC.
- The Amazon Model: Sell the goods and collect cash today; pay the suppliers in 60 days. You're growing using the supplier's money. This floats the business and pushes FCF up.
Interview script
Free Cash Flow is the cash a company generates after funding its operations and maintaining its asset base. It's what's actually available to distribute to all capital providers without compromising the business. Net income is polluted by non-cash charges and accounting elections, and EBITDA ignores CapEx and working capital needs. FCF tells you how much cash you could pull out each year without destroying the business. That's why DCF valuations discount FCF. Cash is what ultimately gets distributed to investors.
