How to Answer Merger Model Questions in IB Interviews (2026)

Why Merger Model Questions Come Up in Every IB Interview

If you're preparing for investment banking interviews, you need to know the merger model inside and out. Alongside the DCF and LBO, the merger model is one of the "big three" technical frameworks that interviewers use to separate prepared candidates from everyone else. M&A interview questions test whether you understand how deals actually create (or destroy) value for shareholders, and that understanding is central to what investment bankers do every day.

This guide covers the complete merger model interview framework: what the model does, how to walk through it step by step, and how to handle the toughest follow-up questions on accretion/dilution, synergies, purchase price allocation, and goodwill.

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"Walk Me Through a Merger Model" — The Framework

When an interviewer asks you to walk through a merger model, they want a clear, structured answer. Here is the framework top candidates use at bulge bracket and elite boutique banks.

Step 1: Make Assumptions About the Transaction

Start by outlining the key deal parameters:

• Purchase price: What is the buyer paying for the target? This is typically expressed as a per-share offer price or as an enterprise value multiple (e.g., 10x EBITDA).
• Mix of consideration: Is the deal funded with all cash, all stock, or a combination? The funding mix is critical because it directly affects accretion/dilution.
• Sources of cash: If there's a cash component, where does it come from — cash on hand, new debt, or both? Each source has a cost (interest expense or foregone interest income) that flows into the pro forma analysis.

Interview tip: Always mention the consideration mix early. Interviewers want to see that you know it drives the entire accretion/dilution outcome.

Step 2: Calculate the Combined Income Statement

After establishing the deal structure, project the combined company's income statement:

1. Add together the buyer's and target's revenue and operating expenses to get combined operating income.
2. Layer in financing adjustments: add new interest expense if debt is raised to fund the cash portion, and remove interest income on any cash the buyer spends from its balance sheet.
3. Subtract any incremental D&A arising from purchase price allocation (more on this below).
4. Apply the combined tax rate to arrive at combined net income.

The goal is to build a clean pro forma income statement that reflects the economics of the merged entity.

Step 3: Estimate Synergies

Synergies are a major reason acquirers pay premiums. There are two types:

• Cost synergies (also called expense synergies): Savings from eliminating duplicate functions — overlapping corporate headquarters, redundant IT systems, headcount reductions. These are more predictable and are usually realized within 1-3 years.
• Revenue synergies: Incremental revenue from cross-selling, expanded distribution, or pricing power. These are harder to forecast and interviewers tend to discount them more heavily.

In your merger model, you add estimated synergies (net of any costs to achieve them) to the combined income statement. Be prepared to discuss how synergies are phased in over time and what percentage of announced synergies companies typically realize.

Key point: Synergies reduce the effective acquisition premium. A deal that looks expensive before synergies may be accretive once cost savings are factored in.

Step 4: Perform Purchase Price Allocation and Calculate Goodwill

Purchase price allocation (PPA) is the process of assigning the purchase price to the target's individual assets and liabilities at their fair market values. Here's how it works:

1. Revalue the target's assets and liabilities to fair market value. Tangible assets like PP&E may be written up or down. Intangible assets such as customer relationships, brand value, patents, and technology are recognized and assigned values.
2. Calculate goodwill: Goodwill is the residual — the difference between the purchase price (equity value paid) and the fair market value of the target's net identifiable assets (assets minus liabilities after revaluation).

Goodwill = Purchase Price − Fair Market Value of Net Identifiable Assets

3. Record incremental D&A: The write-ups to tangible assets and newly recognized intangible assets must be depreciated or amortized over their useful lives. This incremental depreciation and amortization is a non-cash expense that reduces the combined company's net income, which is why it matters for accretion/dilution.

Goodwill itself is not amortized under U.S. GAAP — it sits on the balance sheet and is tested annually for impairment. Under IFRS, goodwill is also not amortized but is subject to impairment testing. This is a common follow-up question, so be ready for it.

Step 5: Calculate Accretion/Dilution to Pro Forma EPS

This is the punchline of the merger model and the most tested concept in M&A interview questions.

Accretion/dilution analysis compares the buyer's standalone EPS to the combined company's pro forma EPS after the deal:

1. Calculate the buyer's standalone EPS: Buyer's net income divided by buyer's shares outstanding.
2. Calculate pro forma EPS: Combined net income (after synergies, financing costs, and incremental D&A) divided by the pro forma share count (buyer's original shares plus any new shares issued to pay for the target).
3. Compare: If pro forma EPS > standalone EPS, the deal is accretive. If pro forma EPS < standalone EPS, the deal is dilutive.

Pro Forma EPS = Combined Net Income / Pro Forma Shares Outstanding

Accretion/(Dilution) % = (Pro Forma EPS − Standalone EPS) / Standalone EPS

What Drives Accretion vs. Dilution?

Understanding the drivers is just as important as knowing the formula. Here are the main factors:

| Factor | Pushes Toward Accretion | Pushes Toward Dilution | |---|---|---| | P/E Arbitrage | Buyer has a higher P/E than the target | Buyer has a lower P/E than the target | | Consideration Mix | More cash (cheaper than equity when buyer P/E is high) | More stock (when buyer P/E is lower than target) | | Synergies | Larger, faster synergies | No synergies or synergies that take years to realize | | Financing Cost | Low interest rates on new debt | High borrowing costs | | Incremental D&A | Minimal write-ups | Large asset write-ups creating significant incremental D&A |

Quick rule of thumb: In an all-stock deal, if the buyer's P/E ratio is higher than the target's P/E ratio, the deal is accretive (before synergies and transaction adjustments). If the buyer's P/E is lower, the deal is dilutive.

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Common Follow-Up Questions

Interviewers will almost always drill deeper after your initial walk-through. Here are the follow-ups you should prepare for:

"What if the deal is dilutive — should the buyer still do it?"

Yes, potentially. A deal can be dilutive in the near term but still create long-term shareholder value. Reasons include strategic benefits (entering a new market, acquiring key technology), synergies that ramp up over time, or the target's faster growth rate that will make the deal accretive in future years. Accretion/dilution is a short-term metric and should not be the sole basis for a go/no-go decision.

"How do synergies affect accretion/dilution?"

Synergies increase combined net income without increasing the share count, so they push the deal toward accretion. You can calculate the breakeven level of synergies needed to make a dilutive deal accretive — this is a common modeling exercise.

"What happens to goodwill if the target's assets decline in value after the acquisition?"

Goodwill is tested for impairment annually. If the fair value of the reporting unit falls below its carrying value (including goodwill), the company records a goodwill impairment charge on the income statement. This is a non-cash charge but can be very large.

"How does the financing mix change the analysis?"

Using more debt adds interest expense but does not increase the share count. Using more stock avoids interest expense but increases shares outstanding, diluting existing shareholders. The optimal mix depends on the buyer's cost of debt vs. cost of equity, current capital structure, and credit rating considerations.

"Why might a buyer choose to pay a premium above the target's current share price?"

The premium reflects the value of synergies, strategic benefits, and the price needed to convince target shareholders to sell. Premiums typically range from 20% to 40% above the unaffected share price, though they vary widely by industry and market conditions.

"Walk me through goodwill in the context of a merger model."

Goodwill arises because the buyer pays more than the fair market value of the target's net identifiable assets. It represents intangible value such as brand strength, market position, assembled workforce, and expected synergies that cannot be separately identified and recorded. Unlike other intangible assets, goodwill is not amortized — it remains on the balance sheet until impaired.

"How does an all-cash deal vs. an all-stock deal differ in terms of accretion/dilution?"

In an all-cash deal, the share count does not change, but you lose interest income on cash spent (or add interest expense on new debt). In an all-stock deal, there is no financing cost, but the share count increases. The relative impact depends on the buyer's P/E, cost of debt, and the size of the deal relative to the buyer.

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Putting It All Together: A Quick Example

Suppose Company A (buyer) has net income of $100M and 50M shares outstanding (EPS = $2.00). It acquires Company B for $500M in an all-stock deal at Company A's current share price of $20, issuing 25M new shares.

• Company B has net income of $30M.
• Expected cost synergies: $10M (pre-tax), or $7.5M after tax at 25%.
• Incremental D&A from PPA: $5M pre-tax, or $3.75M after tax.

Pro forma net income = $100M + $30M + $7.5M − $3.75M = $133.75M Pro forma shares = 50M + 25M = 75M Pro forma EPS = $133.75M / 75M = $1.78

Standalone EPS was $2.00, so the deal is dilutive by approximately 11%. The buyer would need significantly higher synergies or a lower purchase price to make this deal accretive.

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How to Practice Merger Model Interview Questions

Merger model questions reward candidates who practice with real deal scenarios and build muscle memory on the key formulas. Knowing the concepts intellectually is not enough — you need to deliver crisp, structured answers under time pressure.

Here's how to prepare effectively:

1. Drill the walk-through until you can deliver it in under 90 seconds without notes.
2. Practice accretion/dilution math with different deal structures (all-cash, all-stock, mixed consideration).
3. Know the drivers cold — P/E arbitrage, synergies, financing costs, and incremental D&A.
4. Study real M&A transactions and think through whether they were likely accretive or dilutive.
5. Use a structured question bank to get reps on the full range of M&A interview questions.

If you haven't already, make sure you also have the DCF walk-through and LBO walk-through locked down — interviewers frequently ask all three in a single superday.

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Start Practicing Now

The best way to prepare for merger model interview questions is to practice under realistic conditions. IB Flash gives you hundreds of technical questions across M&A, valuation, accounting, and more — with instant AI feedback on your answers. Whether you're targeting Goldman Sachs, Moelis, or Centerview, start drilling merger model questions today so you walk into your interviews with total confidence.

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