Walk Me Through a Paper LBO: The Interview Answer

"Walk me through a paper LBO" is a different question from "walk me through an LBO," even though the two sound almost identical. The full LBO walkthrough is about explaining the mechanics of a leveraged buyout in words. A paper LBO is a timed math exercise: no Excel, no calculator, just a pen, a blank sheet of paper, and a handful of assumptions the interviewer reads out loud. You are expected to land on an IRR and a multiple on invested capital in five to ten minutes, entirely in your head.

It shows up constantly in private equity recruiting and in some growth equity and later-round investment banking interviews, usually as a screening step before a full modeling test. This guide covers the five-step framework for working through it, a full worked example using round numbers you can actually do in your head, and the shortcut for estimating IRR without a calculator, which is the part that trips up most candidates who otherwise know the mechanics cold.

What Makes a Paper LBO Different

A paper LBO strips out everything that makes a real LBO model complicated. There is no working capital schedule, no separate revenue and margin build, and usually no distinction between different tranches of debt. The interviewer hands you an entry multiple, a rough capital structure, a growth assumption, and an exit multiple, and expects you to move through the deal at that same simplified level of detail.

That is also what makes it a fair test of whether you actually understand LBO mechanics rather than having memorized how to operate a model. If you can only get to the right answer by building out a full three-statement model in Excel, a paper LBO will expose that immediately, since none of that structure is available to lean on.

The 5-Step Framework

The steps mirror a full LBO model, just compressed to numbers you can carry through mental math.

1. Entry valuation. Multiply LTM EBITDA by the entry multiple to get the entry enterprise value.
2. Capital structure. Split that entry enterprise value into debt and equity using the leverage ratio you're given, usually expressed as a percentage or as a multiple of EBITDA.
3. Operating assumptions. Round the EBITDA growth rate to something clean and project EBITDA out over the holding period, typically five years.
4. Debt paydown. Apply whatever cash flow assumption you're given, often a flat percentage of EBITDA or free cash flow, to pay down the debt balance year by year, or just estimate a lump sum reduction if the interviewer gives you one directly.
5. Exit and return. Multiply the exit-year EBITDA by the exit multiple to get exit enterprise value, subtract the remaining debt to get exit equity value, then divide by the original equity check to get your multiple on invested capital, and convert that into an approximate IRR.

Say all five steps out loud as you go. Interviewers running a paper LBO are watching your process as much as your final number, and narrating each step gives them the chance to correct a misheard assumption before it compounds through the rest of the math.

A Worked Example

Here is a version built entirely around numbers you can carry in your head, the same way you would want to set one up for yourself in an actual interview.

The target has $100M of LTM EBITDA, and the sponsor pays a 5.0x entry multiple, putting entry enterprise value at $500M. The deal is financed 60 percent debt and 40 percent equity, so that's $300M of debt and a $200M equity check.

Assume EBITDA grows by a clean $10M a year for five years, taking it from $100M to $150M at exit. Assume the company pays down half its original debt balance over the hold, bringing debt from $300M down to $150M by exit.

At exit, assume the multiple holds flat at 5.0x. Exit enterprise value is $150M times 5.0x, or $750M. Subtract the $150M of remaining debt, and exit equity value comes out to $600M.

The sponsor put in $200M and got back $600M, a multiple on invested capital of 3.0x. That's the number a paper LBO wants from you, clean and defensible, built entirely from round figures you chose on purpose. If you get turned around at any point on which figure is enterprise value versus equity value, that's the exact distinction this calculation is testing at both the entry and exit steps.

The IRR Shortcut: Getting From MOIC to a Return Without a Calculator

Getting to a MOIC is the easy part. Converting that multiple into an IRR without a calculator is where most candidates either freeze or guess, and it's usually the actual thing being tested once the MOIC is on the table.

The way around it is a lookup table, memorized ahead of time, that maps common MOIC outcomes to their approximate IRR over a five-year hold:

• 1.5x MOIC over 5 years is roughly an 8% IRR
• 2.0x MOIC over 5 years is roughly a 15% IRR
• 2.5x MOIC over 5 years is roughly a 20% IRR
• 3.0x MOIC over 5 years is roughly a 25% IRR
• 4.0x MOIC over 5 years is roughly a 32% IRR

These come from the same compounding relationship as any return calculation, MOIC equals (1 plus IRR) raised to the number of holding years, but reversing that algebra in your head under time pressure is not realistic. Memorizing the table ahead of time is the actual skill being tested, not the algebra behind it.

Applied to the worked example above, a 3.0x MOIC over a five-year hold lands at roughly a 25% IRR, comfortably inside the 20 percent-plus range most private equity firms target on a deal like this.

If your holding period isn't five years, adjust directionally: the same MOIC over a shorter hold implies a higher IRR, and over a longer hold implies a lower one, since the same return is being compounded over fewer or more years.

Where Most People Lose Points

A few mistakes come up repeatedly enough to call out directly. The first is losing track of an assumption midway through, usually the entry multiple or the debt split, because it wasn't written down or repeated back to the interviewer at the start. The second is trying to do the math with unrounded numbers the interviewer gave loosely, instead of proposing a clean approximation out loud and confirming it's fine to use. The third is landing on a MOIC and having no way to convert it into an IRR, which turns a mostly correct answer into an incomplete one.

None of these come down to weak modeling skills. They come down to not having run the mental math enough times for the process to feel automatic under a countdown clock.

Where to Go From Here

A paper LBO rewards repetition more than any other interview question, since the format never changes, only the round numbers plugged into it. Offcycle has paper LBO scenarios, the IRR-to-MOIC shortcut table, and the surrounding LBO and valuation concepts built into structured flashcards you can work through by topic and difficulty.

Beyond flashcards, you get custom practice sets you can build around whatever you're weakest on, quizzes that test the same material a different way, and a readiness score that tracks your progress across accounting, valuation, DCF, M&A, and LBO topics so you know exactly where you stand before you walk into the room.

The trial is free for 7 days and doesn't require a card to start.