Walk Me Through a DCF: The 2-Minute Answer That Lands Every Time

If you're interviewing for investment banking, you will hear "Walk me through a DCF." It's one of the most common technical questions out there, and interviewers use it to separate candidates who memorized a definition from those who actually understand valuation.

The good news: you can nail it in about two minutes with a simple five-step structure. Below you'll get the exact script, a worked example with real numbers, and the follow-up questions that usually come next.

What the Interviewer Is Really Testing

This question isn't about reciting a textbook. Your interviewer wants to see three things:

• Structure: Can you explain a multi-step process in a logical order without rambling?
• Understanding: Do you know why each step exists, not just what it is?
• Composure: Can you deliver a clean answer under pressure, like you would to a client?

Two minutes is the sweet spot. Shorter sounds shallow. Longer and you'll lose them in the weeds.

The 2-Minute Answer (Use This Script)

Here's a version you can adapt and practice out loud:

"A DCF values a company based on the present value of the cash flows it will generate in the future.

First, I'd project the company's unlevered free cash flow, usually over five to ten years. Unlevered free cash flow is the cash available to all capital providers, both debt and equity. I'd start with revenue, work down to EBIT, subtract taxes to get NOPAT, then add back D&A, subtract capital expenditures, and subtract the increase in net working capital.

Second, I'd calculate the discount rate, which is the weighted average cost of capital, or WACC. That blends the cost of equity, usually from CAPM, with the after-tax cost of debt, weighted by the company's capital structure.

Third, I'd estimate a terminal value to capture all the cash flows beyond the projection period. I can use either the perpetuity growth method, which assumes cash flows grow at a modest constant rate forever, or the exit multiple method, which applies a multiple like EV/EBITDA to the final year's metric.

Fourth, I'd discount the projected cash flows and the terminal value back to today using WACC, and add them up. That gives me enterprise value.

Finally, to get to equity value, I'd subtract net debt and other non-equity claims like preferred stock and noncontrolling interests. Dividing by diluted shares outstanding gives an implied share price, which I can compare to the current market price."

That's it. Clear, ordered, and complete.

Breaking Down Each Step

Knowing the script is step one. Understanding it is what gets you through the follow-ups.

Step 1: Project Unlevered Free Cash Flow

The standard formula:

Unlevered FCF = EBIT × (1 − tax rate) + D&A − CapEx − Increase in NWC

Why "unlevered"? Because you're valuing the whole business, independent of how it's financed. Interest payments are excluded so that the cash flow belongs to everyone who funded the company.

Step 2: Calculate WACC

WACC = (E / (D + E)) × Cost of Equity + (D / (D + E)) × Cost of Debt × (1 − tax rate)

• Cost of equity usually comes from CAPM: risk-free rate + beta × equity risk premium.
• Cost of debt is taxed-affected because interest is tax-deductible.

The discount rate has to match the cash flow. Unlevered FCF goes to all investors, so you discount it at the blended rate all investors require.

Step 3: Estimate Terminal Value

You have two options:

• Perpetuity growth (Gordon growth): TV = Final Year FCF × (1 + g) / (WACC − g)
• Exit multiple: TV = Final Year EBITDA × an EV/EBITDA multiple

The growth rate in the perpetuity method should be modest, typically in line with long-term inflation or GDP growth. A company can't outgrow the economy forever.

Step 4: Discount Everything Back

Each year's cash flow gets divided by (1 + WACC) raised to the number of years out. The terminal value is discounted using the final projection year's factor, since it represents value as of that point.

Step 5: Bridge to Equity Value

Equity Value = Enterprise Value − Debt + Cash − Preferred Stock − Noncontrolling Interests

Then divide by diluted shares (including the effect of options and convertibles) to get the implied share price.

A Worked Example With Real Numbers

Let's run a simplified DCF so the steps feel concrete. All figures are in $ millions.

Assumptions:

• Unlevered FCF for Years 1 to 5: 100, 110, 120, 130, 140
• WACC: 10%
• Terminal growth rate: 3%
• Debt: 400, Cash: 150
• Diluted shares: 50 million

Present Value of Projected Cash Flows

Terminal Value

• TV = 140 × 1.03 / (0.10 − 0.03) = 144.2 / 0.07 = 2,060
• PV of TV = 2,060 × 0.6209 = about 1,279

From Enterprise Value to Share Price

• Enterprise Value = 447.7 + 1,279 = about 1,727
• Net Debt = 400 − 150 = 250
• Equity Value = 1,727 − 250 = about 1,477
• Implied Share Price = 1,477 / 50 = about $29.54

Notice something? The terminal value makes up roughly 74% of enterprise value. That's normal for a DCF, and it's exactly why interviewers love to ask about it.

The Follow-Up Questions You Should Expect

Once you finish your answer, the interviewer will often dig into one piece. Be ready for these:

"Why do we use unlevered free cash flow?"

Because a DCF typically values the entire enterprise. Unlevered FCF ignores the capital structure, so it reflects cash available to both debt and equity holders. That's why it pairs with WACC.

"What's the difference between the two terminal value methods?"

The perpetuity growth method is grounded in the company's own fundamentals. The exit multiple method is grounded in how the market values comparable companies today. Bankers often calculate both and use each as a sanity check on the other. For example, you can back out the implied growth rate from an exit multiple and see if it's reasonable.

"Which assumptions matter most?"

WACC and the terminal value assumptions (growth rate or exit multiple), since terminal value usually drives most of the valuation. Small changes there can swing the result a lot. That's why DCFs are usually shown with sensitivity tables.

"What happens to the valuation if WACC goes up?"

Value goes down. A higher discount rate means future cash flows are worth less today.

"What's the mid-year convention?"

It assumes cash flows arrive in the middle of each year instead of at the end, which better reflects how businesses actually earn cash. It slightly increases the valuation because cash is discounted over shorter periods.

"When would you not use a DCF?"

When cash flows are very hard to predict, such as early-stage startups with no profits. It's also less common for banks and insurance companies, where debt is part of operations rather than just financing, so analysts tend to use equity-based approaches instead.

Common Mistakes That Cost Candidates

Avoid these and you're already ahead of a lot of the pack:

• Mixing levered and unlevered: Discounting unlevered FCF at the cost of equity (or levered FCF at WACC) is a red flag.
• Forgetting the equity bridge: Stopping at enterprise value when the question implies a share price.
• Rambling into details: You don't need to explain beta regression in your first answer. Save depth for follow-ups.
• Using basic shares instead of diluted: It's a small detail that shows you know what you're doing.
• Sounding memorized: If you recite it like a robot, the interviewer will probe until you crack.

How to Practice So It Sounds Natural

• Say it out loud daily for a week. Time yourself and aim for 90 seconds to 2 minutes.
• Record yourself and listen for filler words and hesitations.
• Explain it to a non-finance friend. If they roughly follow, you understand it.
• Build a mini DCF in Excel with the numbers above. Changing WACC or the growth rate and watching the output move will make every follow-up easier.

The Bottom Line

"Walk me through a DCF" rewards structure over complexity. Hit the five steps in order: project unlevered FCF, calculate WACC, estimate terminal value, discount to enterprise value, and bridge to equity value. Then be ready to explain the why behind each one.

Master this answer and you won't just survive the question. You'll use it to show the interviewer you already think like an analyst.