Walk Me Through a Merger Model: Step-by-Step Interview Answer

Why the Merger Model Question Matters

"Walk me through a merger model" is one of the most common and most important technical questions in investment banking interviews. It tests whether you understand the mechanics of M&A transactions at a deep level -- not just the concept, but the actual financial modeling steps that drive deal analysis.

A merger model determines whether an acquisition is accretive or dilutive to the acquirer's earnings per share (EPS). This analysis directly influences whether a deal gets done, how it is structured, and at what price. Every M&A banker needs to build these models quickly and accurately, which is why interviewers use this question as a litmus test for technical readiness.

This guide walks you through every step of the merger model, from purchase price assumptions through accretion/dilution analysis, with practical detail that goes well beyond a surface-level answer.

---

Step 1: Establish the Purchase Price

The merger model starts with the transaction price. You need to determine how much the acquirer is paying for the target.

Offer Price Per Share: In public acquisitions, this is typically expressed as a price per share representing a premium to the target's current stock price. Premiums typically range from 20-40% depending on the sector, competitive dynamics, and whether the deal is hostile or friendly.

Equity Purchase Price: Multiply the offer price per share by the target's fully diluted share count. Remember to use the treasury stock method to account for in-the-money options and other dilutive securities.

Enterprise Value of the Transaction: Starting from equity value, add the target's net debt (total debt minus cash) to arrive at the implied enterprise value. This is the total cost of acquiring the business, not just the equity.

A strong interview answer specifies these components clearly. Many candidates stumble by conflating equity purchase price and enterprise value, so make sure you keep them distinct.

---

Step 2: Build Sources and Uses

The sources and uses table is the financial backbone of any acquisition. It answers: where does the money come from, and where does it go?

Uses of Funds

• Equity Purchase Price: The total payment to target shareholders
• Refinancing of Target Debt: If existing debt is being retired at close (often required by change-of-control provisions)
• Transaction Fees: Advisory fees, financing fees, and legal costs (typically 1-3% of deal value)

Sources of Funds

• Cash on Hand: The acquirer's existing cash balance used for the transaction
• New Debt Issuance: Term loans, bonds, or other debt raised to finance the deal
• Stock Issuance: New shares issued to target shareholders in a stock-for-stock or mixed consideration deal
• Assumed Debt: In some cases, the acquirer assumes the target's existing debt rather than refinancing it

Sources must equal uses. This is a check that interviewers expect you to mention. If the numbers do not balance, something is wrong with your assumptions.

---

Step 3: Create the Goodwill and Purchase Price Allocation Schedule

When an acquirer pays more than the book value of a target's net assets (which is almost always the case), the excess must be allocated on the combined balance sheet.

Purchase Price Allocation Process:

1. Fair value the target's tangible assets and liabilities. This may involve writing up certain assets (like PP&E or inventory) to fair market value, creating a deferred tax liability on the write-up.
2. Identify and value intangible assets. Customer relationships, technology, trade names, and other intangibles are assigned fair values. These will be amortized over their useful lives, creating a new non-cash expense on the combined income statement.
3. Calculate goodwill. Goodwill equals the equity purchase price minus the fair value of net identifiable assets (tangible assets plus intangible assets minus liabilities). Goodwill is not amortized but is tested annually for impairment.

For interview purposes, you should be able to explain this process conceptually and walk through a simplified numerical example. A common simplification is: goodwill = equity purchase price minus target's book value of equity, adjusted for any asset write-ups and identified intangibles.

---

Step 4: Estimate Synergies

Synergies are the value creation (or destruction) expected from combining two companies. They are a critical input to the merger model and often the difference between a deal being accretive or dilutive.

Revenue Synergies

Cross-selling opportunities, pricing power from increased market share, and access to new distribution channels. Revenue synergies are harder to achieve and take longer to realize, so the market typically discounts them more heavily.

Cost Synergies

Eliminating duplicate functions (two headquarters, two CFOs, overlapping sales teams), renegotiating vendor contracts with greater scale, and consolidating facilities. Cost synergies are more credible and usually modeled to phase in over one to three years.

How to Model Synergies

In the merger model, synergies flow through the combined income statement. Cost synergies reduce operating expenses, while revenue synergies increase the top line. Both are taxed at the combined company's marginal tax rate to arrive at after-tax synergy value.

A strong interview answer acknowledges that synergies look good in models but are difficult to achieve in practice. Integration costs -- restructuring charges, severance payments, systems integration -- partially offset synergy gains in the early years.

---

Step 5: Build the Combined Income Statement

This is where the model comes together. You are combining the acquirer's and target's income statements and layering in the transaction adjustments.

Line-by-Line Construction

Revenue: Acquirer revenue + target revenue + revenue synergies (if any).

Cost of Goods Sold and Operating Expenses: Acquirer COGS/opex + target COGS/opex - cost synergies + amortization of newly created intangible assets from PPA.

Interest Expense: This is where the financing structure matters. You need to include:

• The acquirer's existing interest expense
• Interest expense on any new debt raised to finance the deal
• Remove the target's old interest expense if its debt was refinanced
• Add interest expense on any assumed debt
• Subtract interest income lost on cash used for the transaction

Pre-Tax Income: Revenue minus all expenses including the adjusted interest expense.

Taxes: Apply the combined company's effective or marginal tax rate.

Net Income: Pre-tax income minus taxes.

Earnings Per Share: Divide net income by the acquirer's new fully diluted share count, which includes any shares issued as deal consideration.

---

Step 6: Perform Accretion/Dilution Analysis

The entire point of the merger model is to answer one question: is this deal accretive or dilutive to the acquirer's EPS?

Accretive: The combined company's pro forma EPS is higher than the acquirer's standalone EPS. This means the deal creates value for the acquirer's shareholders on an earnings basis.

Dilutive: Pro forma EPS is lower than the acquirer's standalone EPS. This means the deal reduces earnings on a per-share basis, at least in the near term.

The Math

Pro Forma EPS = Combined Net Income / Acquirer's New Share Count
Accretion/Dilution = Pro Forma EPS - Acquirer Standalone EPS
Accretion/Dilution % = (Pro Forma EPS - Standalone EPS) / Standalone EPS

Key Drivers of Accretion/Dilution

Several factors determine whether a deal is accretive or dilutive:

• Purchase price multiple vs. acquirer's trading multiple: If the acquirer trades at 20x earnings and buys a target at 15x earnings, the deal is naturally accretive (assuming similar growth profiles and all-stock consideration).
• Consideration mix: All-cash deals funded by cheap debt are more likely to be accretive since you are replacing a high-cost equity yield with lower-cost debt. All-stock deals at a premium to the target's current price tend to be more dilutive.
• Synergies: Cost and revenue synergies improve the combined earnings, pushing toward accretion.
• Financing costs: Higher interest rates on new debt increase interest expense and push toward dilution.
• Purchase price allocation: Amortization of intangible assets from PPA reduces earnings and pushes toward dilution.

---

Step 7: Sensitivity Analysis

No merger model is complete without testing how the output changes under different assumptions. Build sensitivity tables around:

• Purchase price premium: How does accretion/dilution change at 20%, 30%, and 40% premiums?
• Consideration mix: What happens with 100% cash, 100% stock, and 50/50?
• Synergy assumptions: Stress-test with 50%, 75%, and 100% of base-case synergies achieved.
• Interest rate assumptions: Model different rates on new financing.

Presenting a sensitivity table alongside your base case demonstrates analytical rigor and shows the interviewer that you think about deals the way senior bankers do.

---

Putting It All Together: The Interview Answer

Here is how to structure your verbal answer when an interviewer asks "Walk me through a merger model":

1. "A merger model analyzes whether an acquisition is accretive or dilutive to the acquirer's earnings per share."
2. "Start with the purchase price -- the offer price per share times fully diluted shares gives you the equity value. Add net debt to get enterprise value."
3. "Build the sources and uses table to show how the deal is funded -- cash, debt, stock -- and what the funds are used for."
4. "Allocate the purchase price by fair-valuing assets, identifying intangibles, and calculating goodwill as the residual."
5. "Estimate synergies -- cost synergies from eliminating redundancies and revenue synergies from cross-selling -- and phase them in over one to three years."
6. "Combine the income statements, adjusting for new interest expense, lost interest income, intangible amortization, and synergies."
7. "Divide combined net income by the new share count to get pro forma EPS, and compare to the acquirer's standalone EPS to determine accretion or dilution."

Practice this answer until it flows naturally. Interviewers want to see that you understand the logic and can explain it clearly, not that you have memorized a script.

---

Master the Merger Model with Practice

The merger model is a cornerstone of M&A analysis and a must-know topic for banking interviews. Understanding goodwill, purchase price allocation, synergies, and accretion/dilution at a deep level will differentiate you from candidates who only know the surface-level answer.

Use the IB Flash platform to drill merger model questions alongside related concepts like comparable companies analysis and DCF modeling. Repetition builds the fluency you need to deliver a crisp, confident answer under interview pressure. Start practicing today.