How do you calculate free cash flow (Explained): Interview Answer Guide 2027
This free cash flow interview question is asking for the cash a business truly generates for its capital providers: unlevered free cash flow equals NOPAT plus depreciation and amortization, minus capital expenditure, minus the increase in net working capital. It strips out financing to measure the operating assets alone — which is why the DCF discounts it at WACC.
What This Free Cash Flow Interview Question Tests
Free cash flow is the cash a company generates after paying for the investments needed to sustain and grow the business — the amount genuinely available to capital providers.
Each adjustment has a logic. D&A is added back because it reduced accounting profit without consuming cash. Capex is subtracted because it is real cash spent to maintain or expand the asset base — the “free” in free cash flow means after this reinvestment. The working capital change captures cash trapped in (or released from) receivables, inventory, and payables.
How to Answer This Free Cash Flow Interview Question
State the build in order: start from NOPAT (or equivalently EBIT × (1 − tax rate)), add back D&A, subtract capex, subtract the increase in net working capital. Give each line its one-line logic — non-cash add-back, real reinvestment, cash timing.
Common Mistakes on the Free Cash Flow Interview Question
- Starting from net income without adjusting for interest. Net income is after interest; FCFF must be before it. Either start from NOPAT/EBIT×(1−t) or add back after-tax interest to net income.
- Flipping the working capital sign. An increase in net working capital consumes cash and is subtracted; a decrease releases cash and is added. This sign error is the most common mechanical mistake.
- Confusing capex with depreciation. Depreciation is the non-cash accounting charge (added back); capex is the actual cash spent (subtracted). They are rarely equal, and the gap between them matters.
This is the kind of technical question that commonly decides interview rounds — candidates report that one hesitant or rambling answer here can end the process on the spot. Practice saying your answer out loud until it sounds calm, structured, and confident.
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FAQ
FCFF vs. FCFE — what's the difference?
FCFF is cash available to all capital providers (debt and equity) before debt service; FCFE is cash available to equity holders after interest and debt repayments. FCFF discounts at WACC, FCFE at the cost of equity.
Why start from NOPAT instead of net income?
NOPAT measures operating profit as if the company had no debt, matching the unlevered perspective. Net income already subtracts interest, which would wrongly penalize the operating cash flow for a financing choice.
Can free cash flow be negative for a good company?
Yes — heavy growth investment (capex, working capital build) can make FCF negative while the business is healthy. The question is whether the reinvestment earns good returns, not whether FCF is positive this year.
How does FCF link to dividends and buybacks?
FCFE is the theoretical ceiling for shareholder distributions. Interview format may vary by role and region — check the official careers page for the current process.
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