Discounted Cash Flow Interview Questions & Answers  Advanced
These more advanced questions cover how you use a DCF "in real life" and some of the complexities that arise when you're using it to value real companies. Most of these are more likely if you're experienced and are interviewing for other investment banking or private equity positions.
1.Explain why we would use the midyear convention in a DCF.
You use it to represent the fact that a company's cash flow does not come 100% at the end of each year  instead, it comes in evenly throughout each year.
In a DCF without midyear convention, we would use discount period numbers of 1 for the first year, 2 for the second year, 3 for the third year, and so on.
With midyear convention, we would instead use 0.5 for the first year, 1.5 for the second year, 2.5 for the third year, and so on.
2.What discount period numbers would I use for the midyear convention if I have a stub period  e.g. Q4 of Year 1  in my DCF?
The rule is that you divide the stub discount period by 2, and then you simply subtract 0.5 from the "normal" discount periods for the future years. Example for a Q4 stub:

Q4 
Year 1 
Year 2 
Year 3 
Year 4 
Year 5 
Normal Discount Periods with Stub: 
0.25 
1.25 
2.25 
3.25 
4.25 
5.25 
MidYear Discount Periods with Stub: 
0.125 
0.75 
1.75 
2.75 
3.75 
4.75 
3. How does the terminal value calculation change when we use the midyear convention?
When you're discounting the terminal value back to the present value, you use different numbers for the discount period depending on whether you're using the Multiples Method or Gordon Growth Method:
• Multiples Method: You add 0.5 to the final year discount number to reflect the fact that you're assuming the company gets sold at the end of the year.
• Gordon Growth Method: You use the final year discount number as is, because you're assuming the cash flows grow into perpetuity and that they are still received throughout the year rather than just at the end.
4.If I'm working with a public company in a DCF, how do I calculate its pershare value?
Once you get to Enterprise Value, ADD cash and then subtract debt, preferred stock, and minority interest (and any other debtlike items) to get to Equity Value.
Then, you need to use a circular calculation that takes into account the basic shares outstanding, options, warrants, convertibles, and other dilutive securities. It's circular because the dilution from these depends on the pershare price  but the pershare price depends on number of shares outstanding, which depends on the pershare price.
To resolve this, you need to enable iterative calculations in Excel so that it can cycle through to find an approximate pershare price.
5.Walk me through a Dividend Discount Model (DDM) that you would use in place of a normal DCF for financial institutions.
The mechanics are the same as a DCF, but we use dividends rather than free cash flows:
 Project out the company's earnings, down to earnings per share (EPS).
 Assume a dividend payout ratio  what percentage of the EPS actually gets paid out to shareholders in the form of dividends  based on what the firm has done historically and how much regulatory capital it needs.
 Use this to calculate dividends over the next 510 years.
 Discount each dividend to its present value based on Cost of Equity  NOT WACC  and then sum these up.
 Calculate terminal value based on P / E and EPS in the final year, and then discount this to its present value based on Cost of Equity.
 Sum the present value of the terminal value and the present values of the dividends to get the company's net present pershare value.
6.When you're calculating WACC, let's say that the company has convertible debt. Do you count this as debt when calculating Levered Beta for the company?
Trick question. If the convertible debt is inthemoney then you do not count it as debt but instead assume that it contributes to dilution, so the company's Equity Value is higher. If it's outofthemoney then you count it as debt and use the interest rate on the convertible for Cost of Debt.
7. We're creating a DCF for a company that is planning to buy a factory for $100 in cash (no debt or other financing) in Year 4. Currently the present value of its Enterprise Value according to the DCF is $200. How would we change the DCF to account for the factory purchase, and what would our new Enterprise Value be?
In this scenario, you would add CapEx spending of $100 in year 4 of the DCF, which would reduce Free Cash Flow for that year by $100. The Enterprise Value, in turn, would fall by the present value of that $100 decrease in Free Cash Flow.
The actual math here is messy but you would calculate the present value by dividing $100 by ((1 + Discount Rate)^{^}4)  the "4" just represents year 4 here. Then you would subtract this amount from the Enterprise Value.