Walk Me Through a DCF: The 5-Step Interview Answer

"Walk me through a DCF" is the most common technical question in investment banking interviews. It is often the first technical question asked, and it does a specific job: it shows the interviewer whether you understand valuation as a structure or as a pile of memorized formulas. The interview answer is a different skill from building the model. You have about a minute, the interviewer has heard the answer hundreds of times, and everything you mention becomes fair game for a follow-up.

Key takeaway: Answer in five steps: project unlevered free cash flow for five to ten years, estimate a terminal value, discount both back at WACC to get enterprise value, bridge from enterprise value to equity value, and divide by diluted shares. Say it in under a minute, then let the interviewer pull the thread.

Why Interviewers Ask It

The question tests three things at once. First, whether you understand what a DCF actually claims: that a company is worth the present value of the cash it will generate. Second, whether you can communicate a technical process in order, without circling back or drowning in detail. Third, whether you can hand the interviewer a map: every term you name, from WACC to terminal value, is something they can now dig into. A good answer is complete but short, because the depth comes out in the follow-ups either way.

The Five-Step Answer

1. Project unlevered free cash flow for five to ten years. Get to EBIT, tax it at the marginal rate to reach NOPAT, add back depreciation and amortization, then subtract capital expenditures and the change in net working capital. The taxes are calculated on EBIT, not taken from the income statement, because reported taxes reflect the interest shield. Unlevered means before interest, so the cash flows belong to all investors, debt and equity alike.

2. Estimate a terminal value. The company does not stop existing when the projection ends. Capture everything beyond the window with either the perpetuity growth method, which grows the final year's cash flow at a modest rate forever, or an exit multiple applied to a terminal-year metric like EBITDA.

3. Discount everything back at WACC. The weighted average cost of capital blends the cost of debt and the cost of equity in proportion to the capital structure. Discounting the projected cash flows and the terminal value to today and summing them gives enterprise value.

4. Bridge to equity value. Subtract net debt, plus any preferred stock and minority interest, to get from the value of the whole business to the value that belongs to shareholders.

5. Divide by diluted shares. The result is an implied share price you can compare against where the stock trades, and against what the comps and precedent transactions say.

A Model Answer You Can Say

"A DCF values a company as the present value of its future cash flows. I would project unlevered free cash flow for five to ten years, then estimate a terminal value using either the perpetuity growth method or an exit multiple. I would discount the projected cash flows and the terminal value back to today at the weighted average cost of capital, which gives enterprise value. Then I would subtract net debt to get equity value and divide by diluted shares for an implied share price. Finally I would sanity check the result against comparable companies and run sensitivities on WACC and the terminal growth rate."

That is about forty-five seconds at a normal speaking pace. It names every concept the interviewer expects and nothing you cannot defend. One deliberate shortcut: the spoken answer compresses the bridge to net debt alone, which is the accepted short version. Know that the full bridge also subtracts preferred stock and minority interest, because that is a fair follow-up.

The Follow-Ups to Expect

Why unlevered free cash flow? Because it is independent of capital structure. Interest is a financing choice, not an operating result. Unlevered cash flows belong to all capital providers, which is exactly who WACC represents, so the numerator and the discount rate match. Discounting levered cash flows at WACC mixes two different claims on the business.

How do you calculate WACC? Weight the after-tax cost of debt and the cost of equity by their share of the capital structure, with the cost of equity usually estimated through CAPM. The mechanics are in our WACC guide and CAPM guide.

Exit multiple or perpetuity growth, which would you use? Cross-check one against the other. An exit multiple is grounded in market pricing but imports the comps' errors and makes the DCF partly circular. Perpetuity growth is internally consistent but hypersensitive to the spread between WACC and the growth rate. Compute the implied multiple from your perpetuity terminal value, or the implied growth rate from your exit multiple, and be ready to defend whichever you led with.

Could you build it with levered free cash flow? Yes. Levered free cash flow comes after interest and debt repayments, so it belongs to equity holders only. Discount it at the cost of equity instead of WACC and you get equity value directly, with no bridge. The pairing is the point: unlevered cash flows go with WACC, levered cash flows go with the cost of equity.

What terminal growth rate would you use? Use a rate at or below the long-run growth of the economy, typically two to three percent. Anything higher implies the company outgrows the economy forever, which no company does.

How much of the value sits in the terminal value? The terminal value usually holds most of it. In the worked example from our DCF valuation guide, the terminal value accounts for roughly three quarters of enterprise value. Interviewers ask this to see whether you understand that the model leans heavily on its furthest, least certain assumptions, which is why sensitivities matter more than any single output.

When is a DCF the wrong tool? It is the wrong tool for banks and insurers, where leverage is the business itself rather than a financing choice, and for companies without predictable cash flows, like early-stage businesses. It is also unreliable at cyclical peaks and troughs, when the base year misleads the whole projection.

What happens to the valuation if interest rates rise? WACC rises, the discount factors shrink, and value falls. The furthest cash flows, including the terminal value, lose the most.

Where Answers Go Wrong

The most common failure is formula recitation: naming Gordon Growth and CAPM inputs before establishing the five-step structure. The interviewer learns you memorized the guide, not that you understand the model. The second is skipping the bridge, jumping from enterprise value straight to a share price without mentioning net debt. The third is naming an assumption you cannot defend. If you say ten percent for WACC, the next question is why, and "that is what the guide used" ends interviews. The fourth is pace. A structured minute beats three unstructured minutes, because the interviewer decides where the detail goes.

Reading It Is Not the Same as Saying It

Most candidates read an answer like the one above, nod, and move on. Then the interview starts, someone is watching, and the five steps come out in the wrong order. The gap between recognizing the answer and delivering it is the part practice has to close.

That is what the Desk Dojo app's Interview Prep is built for. The AI interviewer asks you this exact question, you record your answer, and it grades what you said against the key points. The Interview Prep page covers how it works.

Conclusion

The DCF walkthrough is five steps: project unlevered free cash flow, estimate terminal value, discount at WACC to enterprise value, bridge to equity value, divide by diluted shares. Deliver the structure in under a minute, know why each step is there, and let the follow-ups show the depth.

For the full model mechanics with worked numbers, see our DCF valuation guide. For the discount rate, see WACC. For the bridge, see enterprise value. For the cash flow inputs, see free cash flow.