What is the difference between horizontal and vertical integration?

Horizontal integration is when competitors in the same industry combine, typically to gain pricing power or scale; vertical integration is when companies at different points in the supply chain combine, typically to improve efficiency or control input costs. A buyer moving toward its end customer, such as a manufacturer acquiring a retailer, is doing forward integration; moving toward its suppliers is backward integration.

What is breakeven analysis in accretion/dilution?

Breakeven analysis solves for the purchase price, or the financing mix, at which pro forma EPS exactly equals the buyer's standalone EPS, meaning the deal is neither accretive nor dilutive. Above that price the deal turns dilutive; below it, accretive. Bankers use this to frame the top of a buyer's negotiating range.

Why do stock deals tend to be dilutive more often than cash deals?

Stock costs the buyer its own earnings yield, 1 divided by its P/E, which for a company trading in the low-to-mid teens works out to a high-single-digit percentage cost. Cash and debt typically cost only a few percent after tax. Because the target's earnings yield has to clear a lower bar with cash or debt, those financing sources are accretive more often than stock.

Is accretion the same thing as a good deal?

No. Accretion only measures whether EPS went up; it says nothing about whether the buyer overpaid relative to the target's intrinsic value. A heavily debt-financed deal can be accretive and still destroy shareholder value if the purchase price exceeds what the target is actually worth, which is why bankers also run a DCF alongside the accretion test.

What's the difference between a strategic buyer and a financial buyer?

A strategic buyer is an operating company, often a competitor or adjacent player, that can realize cost and revenue synergies from combining operations. A financial buyer, typically private equity, usually cannot capture those same synergies and instead focuses on returns from leverage, operational improvement, and eventual exit. Because strategic buyers can justify a higher price with synergy value, they tend to pay bigger premiums in competitive processes.

How do net operating losses (NOLs) come up in a merger model interview?

NOLs are a target's accumulated tax losses that can offset the combined company's future taxable income, subject to an annual limit under IRC Section 382 based on the equity purchase price and a prescribed long-term rate. Interviewers rarely expect you to compute the exact limit from memory; they want you to know NOLs reduce the combined company's cash taxes for a period, which is a small positive to combined net income in the model.

Merger Model Interview Questions & Answers

Merger model interview questions test whether you understand deal mechanics, not just vocabulary. Interviewers ask you to explain accretion and dilution, price out cash versus debt versus stock financing, walk through how goodwill gets created, and justify why a company would acquire another in the first place. Most questions build on a small set of rules: the after-tax cost of cash and debt is the rate times one minus the tax rate, the cost of stock is one divided by the acquirer's P/E, and a deal is accretive only when the seller's earnings yield beats the blended cost of financing. This hub covers 18 of the most common merger model and M&A interview questions with concise, model answers.

What are the most common merger model interview questions?

Interviewers move through a predictable progression: definitions first, then accretion/dilution math, then financing tradeoffs, then softer questions on rationale and integration. Breaking Into Wall Street notes that interviewers increasingly weight the fundamentals of accretion/dilution math over obscure transaction structures or tax details, so expect at least two or three quantitative follow-ups once you clear the conceptual questions. Below are 18 of the questions that come up most, grouped by topic, each with the answer an interviewer wants to hear.

What makes a deal accretive or dilutive?

A deal is accretive when the combined company's pro forma EPS is higher than the acquirer's standalone EPS, and dilutive when it's lower. You build this by combining both companies' net income, adjusting for the after-tax cost of whatever cash, debt, or stock funded the deal, then dividing by the new pro forma share count. If that number beats the buyer's pre-deal EPS, the deal accretes; if it falls short, it dilutes. The full mechanics, including a worked example, are in accretion/dilution analysis.

How do you quickly test an all-stock deal without building the full model?

For a pure stock deal, compare the buyer's cost of acquisition (1 divided by its own P/E) to the target's seller's yield (1 divided by the purchase P/E). Per Breaking Into Wall Street, if a buyer trading at 25x acquires a target for a purchase P/E of 15x in an all-stock deal, the cost of acquisition is 1/25, or 4 percent, and the seller's yield is 1/15, or 6.7 percent. Because the seller's yield exceeds the cost, the deal is accretive. Flip the multiples and the same shortcut turns dilutive, which is exactly what happens in Street of Walls' 11.0x buyer, 13.0x target example (see accretion/dilution analysis).

How does financing method change the accretion/dilution answer?

Cash, debt, and stock each carry a different cost, and the deal's outcome depends on which one you use. The after-tax cost of cash is the foregone interest rate times one minus the tax rate; the after-tax cost of new debt is the interest rate times one minus the tax rate; the cost of new stock is one divided by the buyer's P/E, since equity has no explicit interest payment but still costs the buyer earnings dilution.

Financing source	After-tax cost	Typically
Cash on hand	Foregone interest rate x (1 - tax rate)	Cheapest
New debt	Interest rate x (1 - tax rate)	Middle
New stock	1 / buyer's P/E (earnings yield)	Most expensive

Because cash and debt usually cost only a few percent after tax while a mid-teens P/E implies a high-single-digit cost of equity, cash and debt deals are more often accretive, and stock deals are more often dilutive. Full mechanics of choosing between them are in cash vs. stock vs. debt consideration mix.

Why do companies actually do M&A?

Per Wall Street Prep, deals happen for three main reasons: the target looks undervalued, the buyer's own organic growth has stalled, or the combination is expected to generate meaningful synergies. Strategic acquirers, meaning competitors or adjacent operators, typically pay higher premiums than private equity firms because they can capture cost and revenue synergies a financial buyer cannot. Interviewers ask this early to see whether you can connect the math to a business reason, not just recite the accretion test. The full rationale framework, including horizontal, vertical, and forward/backward integration, is in why companies do M&A.

What are synergies, and how do you value them in a merger model?

Synergies are the extra value created by combining two companies that neither could achieve alone, and they split into cost synergies and revenue synergies. Cost synergies, like closing duplicate offices or eliminating overlapping headcount, are more reliably realized because the buyer directly controls the cuts. Revenue synergies, like cross-selling the target's products to the buyer's customer base, are harder to achieve because they depend on customer behavior the buyer doesn't control. In a merger model, synergies add to combined net income after tax, which raises pro forma EPS and can flip a marginally dilutive deal to accretive. See synergies in M&A for how bankers size and phase them in.

What is goodwill, and how does an acquisition create it?

Goodwill is the amount the buyer pays above the fair value of the target's identifiable net assets, and it captures everything a balance sheet can't itemize: brand, customer relationships, and expected synergies. It gets created during purchase price allocation, where the buyer writes the target's assets up to fair value and books the remaining premium as goodwill on the combined balance sheet. Goodwill doesn't amortize under U.S. GAAP; it sits unchanged unless the buyer later determines it overpaid, at which point the company records an impairment charge. Full purchase accounting mechanics are in goodwill and purchase accounting.

What's the difference between a merger and an acquisition?

An acquisition typically means the buyer is significantly larger than the target and absorbs it outright, often retaining the target's brand if it has value, the way a large company buys a smaller one and keeps its product name. A merger typically implies the two companies are closer in size, and the combined entity sometimes takes a blended name. In practice, most deals labeled "mergers of equals" are still structured with one company as the legal acquirer for accounting purposes, so don't overthink the distinction in an interview; interviewers care more that you know the accretion/dilution mechanics apply either way.

How do you build the pro forma combined company in a merger model?

Building the combined entity means stacking the acquirer's and target's income statements, layering in the financing effects (new debt interest, foregone interest on cash used, new shares issued), then working down to a pro forma net income and EPS. You also combine balance sheets, adjusting for the purchase price allocation that creates goodwill and any asset write-ups. This is the step interviewers eventually walk you through with real numbers once you've cleared the conceptual questions, so know the order of operations cold. The full build sequence, including how enterprise and equity value combine, is in how to build a merger model.

Sources

Street of Walls, "Merger Model Questions": https://www.streetofwalls.com/articles/investment-banking/recruiting-interviewing/merger-model-questions/ (checked July 2026)
Wall Street Prep, "M&A Interview Questions": https://www.wallstreetprep.com/knowledge/ma-interview-questions/ (checked July 2026)
Breaking Into Wall Street, "Merger Model Interview Questions": https://breakingintowallstreet.com/kb/ma-and-merger-models/ma-interview-questions/ (checked July 2026)
Street of Walls, "Merger Model: Accretion/Dilution": https://www.streetofwalls.com/articles/investment-banking/recruiting-interviewing/merger-model-accretion-dilution/ (checked July 2026)

Merger Model Interview Questions: 18 Real Examples