Walk Me Through an LBO: How to Answer This Classic IB Interview Question (With a Worked Example)

"Walk me through an LBO" is one of those questions you can almost guarantee will come up, especially if you're interviewing for a group that works with private equity clients. The good news: there's a clean, repeatable structure for answering it.

In this post, you'll get a 30-second answer you can say out loud, a step-by-step breakdown of each part, a worked example with real numbers, and the follow-up questions interviewers like to ask next.

What the Interviewer Is Really Testing

When someone asks you to walk through an LBO, they're not looking for a lecture on private equity. They want to see three things:

• You understand the logic: a buyer uses a lot of debt to acquire a company, then aims to sell it later for a strong return on its equity.
• You can structure an answer: clear steps, in order, without rambling.
• You know what drives returns: this is where strong candidates separate themselves.

Keep your answer to 60 to 90 seconds. If they want more detail, they'll ask.

The Short Answer You Can Say Out Loud

Here's a version you can adapt and practice:

"In an LBO, a private equity firm acquires a company using a combination of debt and equity, with debt usually making up the majority of the funding.

First, you make assumptions about the purchase price, usually as a multiple of EBITDA, and how the deal will be financed. That gives you your sources and uses.

Second, you project the company's financial statements over the holding period, typically 3 to 7 years, focusing on free cash flow.

Third, you use that free cash flow to pay down debt over time.

Fourth, you assume an exit, usually by applying a multiple to EBITDA in the final year, and subtract the remaining net debt to get the equity value at exit.

Finally, you compare the equity the sponsor gets back at exit to the equity it put in, and calculate returns using IRR and the multiple of invested capital."

That's it. Five steps. Now let's unpack each one so you can handle the follow-ups.

Step-by-Step: What Happens in Each Stage

Step 1: Set the Purchase Price and Financing

The buyer, often called the financial sponsor, first decides how much to pay. This is usually expressed as a multiple of the company's EBITDA, like "10x EBITDA."

Then it decides how to fund that price. The sources and uses table lays this out:

• Uses: where the money goes (buying the equity, refinancing existing debt, paying transaction fees)
• Sources: where the money comes from (new debt, sponsor equity, sometimes cash on the balance sheet)

Sources must always equal uses. If they don't, something is wrong.

Step 2: Project the Financials

Next, you build out projections for the holding period. The key items are revenue growth, EBITDA margins, capital expenditures, changes in working capital, interest expense, and taxes.

The number you care most about is free cash flow, because that's the cash available to pay down debt.

Step 3: Pay Down Debt

Each year, free cash flow goes toward repaying debt. As debt falls, interest expense falls too, which frees up even more cash in later years.

This is one of the quiet engines of LBO returns. Even if the business doesn't grow at all, paying down debt shifts value from lenders to the equity holders.

Step 4: Assume an Exit

At the end of the holding period, you assume the sponsor sells the company (or takes it public). The standard approach:

• Exit Enterprise Value = Final-year EBITDA × Exit multiple
• Exit Equity Value = Exit Enterprise Value minus Net Debt at exit

A common, conservative assumption is that the exit multiple equals the entry multiple, so you're not relying on the market getting more generous.

Step 5: Calculate Returns

Finally, you measure what the sponsor earned on its equity:

• MOIC (multiple of invested capital): Equity at exit ÷ Equity invested
• IRR (internal rate of return): the annualized return, which accounts for how long the money was tied up

Sponsors typically look for IRRs somewhere around 20% or higher, though targets vary by firm and market conditions.

A Worked Example With Real Numbers

Let's put numbers on this so it actually sticks. To keep the math clean, we'll ignore transaction fees and assume the company is acquired cash-free and debt-free.

The Setup

• Company EBITDA today: $100 million
• Purchase multiple: 10x
• Purchase price (Enterprise Value): $1,000 million
• Financing: 60% debt, 40% equity

The Holding Period

Over 5 years, assume:

• EBITDA grows from $100M to $150M (roughly 8.4% per year)
• The company generates $300M of cumulative free cash flow, all used to repay debt
• Debt falls from $600M to $300M

The Exit

• Exit multiple: 10x (same as entry)
• Exit Enterprise Value: $150M × 10 = $1,500M
• Less remaining debt: $300M
• Exit Equity Value: $1,200M

The Returns

• MOIC: $1,200M ÷ $400M = 3.0x
• IRR: a 3.0x return over 5 years works out to roughly 25%

That's a solid result for a sponsor.

Where Did the Returns Come From?

This is the part that impresses interviewers. The sponsor's equity grew from $400M to $1,200M, a gain of $800M. You can break that gain into three drivers:

• EBITDA growth: $50M more EBITDA × 10x multiple = $500M
• Debt paydown: $600M down to $300M = $300M
• Multiple expansion: entry and exit at 10x = $0

Total: $500M + $300M + $0 = $800M. It ties out perfectly.

If you can explain an LBO through these three levers of returns, you're already ahead of most candidates.

Why Leverage Matters So Much

Imagine the sponsor had bought the same company with 100% equity, putting in the full $1,000M.

At exit, the company would still be worth $1,500M. Even after adding the cash it would have built up (a bit more than $300M, since it wouldn't be paying interest), the sponsor would end up with less than 2.0x its money.

Compare that to 3.0x with leverage. Same business, same growth, same exit price. The difference is that debt let the sponsor control a $1,000M company with only $400M of its own money. That's the whole point of the "leveraged" in leveraged buyout.

Of course, leverage cuts both ways. If the business struggles, those fixed debt payments can wipe out the equity entirely.

Handy IRR Shortcuts to Memorize

Interviewers sometimes ask you to estimate IRR in your head. These approximations will save you:

• 2.0x in 5 years: about 15%
• 3.0x in 5 years: about 25%
• 2.0x in 3 years: about 26%
• 3.0x in 3 years: about 44%

Notice how time matters: doubling your money in 3 years is a much better outcome than doubling it in 5.

Follow-Up Questions You Should Expect

Once you nail the walkthrough, be ready for these:

"What makes a company a good LBO candidate?"

Focus on anything that makes it safe to carry a lot of debt and easy to exit:

• Stable, predictable cash flows
• Low capital expenditure needs
• Strong market position
• Room for operational improvements
• A credible path to sell the business later

"How can a sponsor increase its returns?"

Go back to the levers: grow EBITDA, pay down more debt, buy at a lower multiple or sell at a higher one, use more leverage, or exit sooner if the gains come early (which boosts IRR).

"What happens to returns if the exit multiple drops?"

Returns fall, sometimes sharply. In our example, if the exit multiple drops to 9x, Exit EV becomes $1,350M, equity becomes $1,050M, and MOIC falls to about 2.6x. That's why sponsors often assume no multiple expansion: it keeps the model honest.

"Why would a sponsor use less debt?"

More debt raises potential returns but also raises the risk of default. Lenders also cap how much they'll lend, often based on multiples of EBITDA and the company's ability to cover interest.

Common Mistakes to Avoid

• Diving into tiny details too early. Don't open with debt tranches and amortization schedules. Start high level.
• Forgetting the debt paydown step. It's one of the main return drivers, so skipping it makes your answer look incomplete.
• Mixing up Enterprise Value and Equity Value. The sponsor's return is based on equity, so always subtract net debt at exit.
• Rambling. If you're past two minutes, you've lost them.

Practice It Until It's Automatic

The best way to lock this in is to say your answer out loud, time yourself, and then rebuild the worked example on a blank sheet of paper from memory. Once you can do both without notes, you'll be ready for the original question and whatever follow-up comes after it.

Master this one, and you'll also have a head start on the paper LBO tests that many PE-focused interviews include.