Easy

Walk me through a DCF

How to answer it in an investment banking interview: what is being tested, a step-by-step framework, a sample answer and the mistakes to avoid.

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What the interviewer is testing

Whether you can give a clean, ordered walk-through in about a minute, and whether you understand the logic behind each step: why unlevered free cash flow, why WACC, and why the terminal value deserves a sensitivity table.

Answer framework

  1. Project unlevered free cash flow for 5 to 10 years from revenue, margins, taxes, capex and working capital.
  2. Calculate a terminal value at the end of the projection period with the Gordon Growth method or an exit multiple.
  3. Discount the cash flows and the terminal value to today at the weighted average cost of capital (WACC).
  4. Sum them to get enterprise value.
  5. Subtract net debt and other claims to get equity value, then divide by diluted shares to get value per share.

Sample answer

I would project the company's unlevered free cash flows, usually for 5 to 10 years, from revenue, margins, taxes, capex and working capital. Unlevered free cash flow is EBIT x (1 - tax rate) + D&A - capex - increase in net working capital.

Then I calculate a terminal value at the end of the projection period, using either the Gordon Growth method or an exit multiple. I discount the projected cash flows and the terminal value back to today at WACC.

The sum is enterprise value. I subtract net debt and other claims to get equity value and divide by diluted shares to get value per share. Because the terminal value is often the majority of the value, I would show the result with sensitivity tables on WACC and the terminal assumptions.

Likely follow-ups

Why use unlevered free cash flow? Because the discount rate (WACC) reflects all capital providers, so the cash flow must be before debt payments too.
If you raise the discount rate by 1%, what happens? Value goes down. A one-point change commonly moves DCF value by roughly 10% to 15%, depending on the gap between the discount rate and the terminal growth rate.

Common mistakes

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Related questions

Based on questions #26, #49, #14, #30, #50 in the full question bank.