Oct 08, 2026 by Offer

How do you calculate free cash flow (With Examples): Interview Answer Guide 2027

This free cash flow interview question is mechanical once you see it. Take a hypothetical company with $70 million of NOPAT, $30 million of D&A, $40 million of capex, and a $10 million working capital increase: FCF = $70m + $30m − $40m − $10m = $50 million — cash available to all capital providers after reinvestment.

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.

How to Answer This Free Cash Flow Interview Question

Build it for a hypothetical company. EBIT is $100 million and the tax rate is 30%, so NOPAT = $100m × 0.70 = $70 million — operating profit as if unlevered. Add back $30 million of depreciation and amortization (non-cash): $100 million. Subtract $40 million of capex — real cash reinvested in the asset base: $60 million.

Sanity-check the story the numbers tell: the business earned $70 million after tax on operations but only $50 million was truly “free” after funding growth. If capex had been $90 million instead — a heavy reinvestment year — FCF would collapse to $10 million despite identical profit, which is precisely why investors value cash flow rather than earnings.

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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