“Walk me through a DCF” – A question candidates must know insideandout for an investment banking interview or even a coffee chat. Showing up unprepared for this question is like wearing a suit without putting on a tie.
❌The bad news: Stumbling on this question and you’re out of the race!
✔️The GOOD news: We’re here to give you the best answer with killer techniques and tips for a successful interview.
1. Walk me Through A DCF: Always Start with A Big Picture
Interview: In a Superday, spitting out everything they know is how inexperienced candidates tend to do it when interviewees give out this question. However, such an approach can only result in a poorly communicated message and decrease your chance of advancing to the next round. 
Be SUCCINCT! A Concise Answer Is All You Need!
At least for the first 2 – 3 minutes. In extreme cases, bankers might even time you on how quickly you can answer this question!
SUPER FAST ANSWER:
 Build a 5year forecast of free cash flow to the firm (FCFF) based on reasonable assumptions
 Calculate a terminal value
 Discount all cash flows to their net present value using a discount rate (often WACC)
“But it’s more complicated than that!”
“But if everyone says the same thing, isn’t that boring?”
Yes, it’s simplified. And yes, it’s structured. Yet, what differs one candidate from another is how crisp they can be on elaborating each step because there are always followup questions.
2. Walk Me Through A DCF: A Detailed Stepbystep Answer
It’s rewind time!
What exactly is DCF anyway?
 DCF (Discounted Cash Flow) analysis is a valuation method for projects, assets, or companies using the concept of the time value of money.
 Simply put, if you consider buying a house for lending to others, you will want to know whether the profit you get in the future is worth the price you are paying today or not?
Why does net present value matter?
 Do you want a dollar now or a dollar in the future? I hope your answer is NOW!
 The general assumption is that $1 today is always worth more than $1 tomorrow! Because, as we all know, INFLATION.
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Step 1 – Building A Longterm Forecast for FCFF
Let’s look at the example of buying a house again. If you want to know whether it’s worth it to invest in the house or not, the first step is always to guess how much money the house can generate for you in the future.
On a bigger scale, in DCF analysis, you need to build a longterm forecast of the project to get the cash flows based on the three financial statements for a period of time. 5 years is the most used number, but a project can be shorter (2 – 3 years) or longer (7 – 8 years) than that.
Important! Anything that goes beyond 10 years should be taken with a grain of salt.
When I say “cash flow”, I mean unlevered cash flow or free cash flow to the firm. It is called “free” because it’s unburdened by debt and available to the entire firm. Although there are 2 types of cash flows, bankers just want you to use the unlevered one. (So make sure you clarify which one you use!)
Free Cash Flow to Firm Formula mostly used by analysts:
FCFF = EBIT(1 – t) + DEPRECIATION & AMORTIZATION – CAPEX – NET CHANGE IN WC
For further reading about how to derive Free Cash Flow and detailed explanation, visit this article:
Since we have “unlevered”, there is definitely “levered” one. In case you’re curious about that, here is a quick comparison:
Levered Cash Flow
 The amount of cash a business has after it has met its financial obligations
 Crucial figures for investors since it is a better indicator of the actual level of a company’s profitability
Unlevered Cash Flow
 The amount of cash the business has before paying its financial obligations
 Cash available to both debt holders and equity holders, representing industry norm and allow for appletoapple comparison > widely used in a DCF model
Step 2 – Calculate the Terminal Value
Reminder!
Enterprise Value = PV of projected cash flows + PV of terminal value
First thing first, what is terminal value?
Terminal value is the present value of all future cash flows beyond the projection period.
Referencing Terminal Value here with detailed explanation.
How do I calculate it?
Again, we have another fight between 2 approaches to calculate the terminal value including Perpetual Growth and Exit Multiple.
Perpetuity Growth (Gordon Growth Method) – Professors’ ToGo:
 Can a business last forever? Maybe, but maybe not. It doesn’t matter. What matters is the assumption that a business can operate at a constant rate forever so we can get a terminal value.
 Choosing the constant rate:
 Since this rate is forever, we have to be extra careful in choosing it.
 A good rule of thumb is to choose either the average longterm expected GDP growth or the inflation growth rate.
 Example: US GDP grows < 3%, so anything less than 3% is a reasonable rate for USbased companies. Anything beyond it, you must have very good reason for choosing that!
 Formula:
 FCF = terminal free cash flow
 R: discount rate
 G: growth rate
 Why Professor’s Togo? Because hardly any bankers use it! The assumption that a business will grow constantly at a fixed rate sounds ridiculous! However, there are many explanation and proofs that have gone into the study of this method, so:
Exit Multiple – Bankers’ Favorite:
 Considering selling the business at the end of the project? Then you need to value it on a market multiple basis.
 Two common market multiples: EV/EBITDA and EV/EBIT
 Is one better than the other? It depends on the company’s assumptions and the industry.
 Formula:
 Terminal value = NTM/LTM EBITDA/EBIT x Exit multiple
 Choosing exit multiple:
 Is this a cyclical industry? If current multiples are 12.0x, but the historical average is 8.0x, it is NOT appropriate to select 11.0x – 13.0x as your exit multiple ranges.
 How are you deriving the exit multiple? Are there good comparables? > Always conduct comparable company analysis to choose a good industry multiple.
If it’s bankers’ favorite, does this mean Exit Multiples win?
Unfortunately, the answer is no!
Why? Because it’s easy to pick a multiple that makes no sense at all!
Good news: Fixing this is easy since you can always crosscheck!
Best practice: Calculate the EBIT/EBITDA multiples implied by a perpetuity growth terminal value and vice versa as a test of reasonableness.
Step 3 – Discount Cash Flows Using WACC for Net Present Value
Once we have projected cash flows and terminal value, it’s time to discount them!
In analysts’ world, WACC is the only discount rate that should be used in a DCF model.
What is WACC then?
 WACC or Weighted Average Cost of Capital is the required rate of return for a firm given the risk to investors from investing in the business.
 Since a firm can either be financed through debt or equity, it’s obvious that
 Cost of Capital = Cost of Debt + Cost of Equity
Visit Weighted Average Cost of Capital for further reading.
Why this one?
 Because it is a function of all alternative investment opportunities available to the firm and the riskiness of making an investment compared to those available alternative returns
Put simply, if you spend money on buying a house, that money cannot be spent on anything else (not just other houses), so you have to factor in the lost opportunities other things can give you.
The golden formula to remember:
WACC = KE + [E / (D+E)] +KD * (1 – T) * [D / (D + E)]
where:
 KE: cost of equity
 KD: cost of debt
 E: market value of equity
 D: market value of debt
 T: marginal tax rate
If this formula doesn’t look familiar to you, it’s time you get a full revision of how to calculate WACC.
The final final step
So you’ve got the discount rate, simply plug it in the formulate to get net present value of all unlevered free cash flows to get the enterprise value of the business, like this:
HOORAY! Now we’re done with “Walk me through a DCF”!
Actually, we’re not quite done, yet… A professional banker will continue to conduct extensive sensitivity and scenario analysis to get a reasonable range of values for a project, instead of relying on a single number and let fate decide the result.
Examples of sensitivity analysis:
 Revenue Growth vs. Terminal Multiple
 EBITDA Margin vs. Terminal Multiple
 Terminal Multiple vs. Discount Rate
 LongTerm Growth Rate vs. Discount Rate
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3. Pros and Cons of DCF
It’s never enough to just know how to do a DCF analysis without truly understanding its strengths and weaknesses.
PROs  CONs 



4. Other DCF Commonly Asked Questions & Answers
A technology company, because technology is viewed as a “riskier” industry than manufacturing.
Levered Free Cash Flow gives you Equity Value rather than Enterprise Value, since the cash flow is only available to equity investors (debt investors have already been “paid” with the interest payments).
Cost of Equity since we’re not concerned with Debt or Preferred Stock as we’re calculating Equity Value, not Enterprise Value.
Only when there are no good Comparable Companies or if you have reason to believe that multiples will change significantly in the industry several years down the road. For example, if an industry is very cyclical you might be better off using longterm growth rates rather than exit multiples.
The median multiples may change greatly in the next 510 years so it may no longer be accurate by the end of the period you’re looking at. This is why you normally look at a wide range of multiples and do a sensitivity to see how the valuation changes over that range.
The “standard” answer: if significantly more than 50% of the company’s Enterprise Value comes from its Terminal Value, your DCF is probably too dependent on future assumptions.
In reality, almost all DCFs are “too dependent on future assumptions” – it’s actually quite rare to see a case where the Terminal Value is less than 50% of the Enterprise Value.
But when it gets to be in the 8090% range, you know that you may need to rethink your assumptions…
The togo answer: “it depends”, but most of the time the 10% difference in revenue will have more of an impact.
That change in revenue doesn’t affect only the current year’s revenue, but also the revenue/EBITDA far into the future and even the terminal value.
Again, it should be “it depends”, but the discount rate is likely to have a bigger impact on the valuation.
Just estimate WACC based on work done by auditors or valuation specialists, or based on what WACC for comparable public companies is.
Banks use debt differently: they create products instead of reinvesting.
Interest is a critical part of banks’ business models and working capital takes up a huge part of their Balance Sheets > a DCF for a financial institution would not make much sense.