Skip to main content

    Merger Model & M&A Interview Questions

    M&A questions are the second most tested category in IB interviews after accounting. Interviewers want to know that you understand deal mechanics, can think about accretion/dilution intuitively, and can discuss real transactions intelligently. This guide covers the key concepts and most common questions. For a detailed breakdown, see Accretion/Dilution Analysis Explained.

    Accretion/dilution analysis

    A deal is accretive when the acquirer's pro forma EPS is higher than its standalone EPS — the acquisition adds more earnings per share than it costs. A deal is dilutive when pro forma EPS is lower. The key drivers: (1) In an all-stock deal, accretion depends on whether the acquirer's P/E is higher than the target's P/E — if you're buying 'cheaper' earnings, the deal is accretive. (2) In a cash/debt deal, accretion depends on whether the target's earnings yield exceeds the after-tax cost of debt — if the earnings you're acquiring exceed the interest cost of borrowing, the deal is accretive. (3) Synergies always push toward accretion because they add earnings without adding cost of acquisition.

    Synergies

    Synergies are the additional value created by combining two businesses. Cost synergies (headcount reduction, facility consolidation, procurement savings) are more credible and easier to quantify — they typically have a 70–80% realization rate. Revenue synergies (cross-selling, geographic expansion, new product bundling) are less certain — realization rates are typically 30–50%. In models, bankers phase in synergies over 1–3 years and present both a 'with synergies' and 'without synergies' case.

    Goodwill

    Goodwill = Purchase Price – Fair Market Value of Net Identifiable Assets. It represents the premium paid above the fair value of what the acquirer actually receives in tangible and identifiable intangible assets. Goodwill is not amortized under US GAAP but is tested for impairment annually. If the acquired business underperforms, goodwill is written down — a non-cash charge that reduces book value but signals the acquisition destroyed value.

    Sample Interview Questions & Answers

    QWalk me through a merger model.

    Calculate acquirer standalone EPS. Determine purchase price, financing mix (cash/debt/stock), and resulting adjustments — new interest expense (if debt), lost interest income (if cash), new shares issued (if stock). Add target's net income plus after-tax synergies, subtract new after-tax costs. Divide combined net income by new share count. Compare to acquirer standalone EPS — higher means accretive, lower means dilutive.

    QAcquirer P/E is 20x, target P/E is 10x, all-stock deal. Accretive or dilutive?

    Accretive. The acquirer is trading at a higher earnings yield per dollar of stock issued. You're issuing 'expensive' stock (high P/E = expensive) to buy 'cheap' earnings (low P/E = high earnings yield per dollar). The math: you buy more EPS than you dilute.

    QWhen would a stock deal be dilutive?

    When the acquirer's P/E is lower than the target's — you're issuing cheap stock to buy expensive earnings. Also possible with large premiums above market price, which increases the effective P/E of the target.

    QHow do synergies affect accretion/dilution?

    Synergies increase combined net income without increasing the purchase price or share count, so they always push the deal toward accretion. A deal that is slightly dilutive before synergies can become accretive once you factor in cost savings.

    QA buyer pays $200M for a target with $50M book equity. Fair value of net assets is $120M. How much goodwill?

    $80M. Goodwill = purchase price ($200M) minus fair market value of identifiable net assets ($120M) = $80M.

    Common Mistakes

    • ✗Confusing accretive/dilutive with whether the deal is 'good' — a dilutive deal can still be strategically valuable
    • ✗Forgetting to tax-affect synergies and interest expense in the accretion/dilution calculation
    • ✗Not understanding the P/E intuition for stock deals — this is the #1 M&A follow-up question
    • ✗Mixing up goodwill calculation — it's purchase price minus FMV of net assets, not book value

    Expert Tips

    • Know 1–2 recent real M&A deals and be prepared to discuss whether they were likely accretive
    • Practice the P/E shortcut for stock deals — it's the fastest way to answer accretion/dilution intuitively
    • Understand both buyer and seller motivations in M&A — interviewers often ask 'why would the target sell?'

    Related Concepts

    Merger Model

    A merger model (also called an [accretion/dilution](https://www.ibflash.com/concepts/accretion-dilution) model) is a financial model that combines the income statements of an acquirer and target to determine the pro forma impact on the acquirer's [earnings per share](https://www.ibflash.com/concepts/earnings-per-share) (EPS). It answers the fundamental question: does this deal increase or decrease the acquirer's EPS?

    Revenue Model & Build

    A revenue model (or revenue build) is the section of a financial model that projects future revenue by breaking it down into its component drivers rather than simply growing the top line at a flat rate. The two primary approaches are top-down (starting with market size and market share) and bottom-up (building from units, pricing, customers, or contracts). A well-constructed revenue model captures the key levers management can pull, enables meaningful [sensitivity analysis](https://www.ibflash.com/concepts/sensitivity-analysis), and provides the foundation for the entire [three-statement model](https://www.ibflash.com/concepts/three-statement-model).

    Gordon Growth Model

    The Gordon Growth Model (GGM), also known as the [Dividend Discount Model](https://www.ibflash.com/concepts/dividend-discount-model) for a constant-growth perpetuity, values an asset as the next period's expected cash flow divided by the discount rate minus the long-term growth rate. In investment banking, the GGM is most commonly applied to calculate the [terminal value](https://www.ibflash.com/concepts/terminal-value) in a [discounted cash flow](https://www.ibflash.com/concepts/discounted-cash-flow) analysis, but it is also used to value dividend-paying stocks directly. The model assumes cash flows grow at a constant rate in perpetuity, which makes it elegantly simple but sensitive to the growth rate assumption.

    Merger Arbitrage

    Merger arbitrage (also called risk arbitrage) is an event-driven hedge fund strategy that seeks to profit from the spread between a target company's current trading price and the announced acquisition price. After a deal is announced, the target's stock typically trades at a discount to the offer price, reflecting the risk that the deal may not close. Merger arbitrage funds buy the target's stock (and sometimes [short](https://www.ibflash.com/concepts/short-selling) the acquirer in stock deals) to capture this spread when the deal closes.

    Dividend Discount Model (DDM)

    The Dividend Discount Model (DDM) is an intrinsic valuation method that prices a stock based on the present value of its expected future dividend payments. It operates on the principle that a stock is worth the sum of all future dividends discounted back to present value at the [cost of equity](https://www.ibflash.com/concepts/cost-of-equity). The DDM is most applicable to mature, dividend-paying companies such as utilities, REITs, and large banks.

    Capital Asset Pricing Model (CAPM)

    The Capital Asset Pricing Model (CAPM) is the standard method for estimating a company's [cost of equity](https://www.ibflash.com/concepts/cost-of-equity) — the return shareholders demand for bearing risk. It says expected return equals the risk-free rate plus a risk premium scaled by [beta](https://www.ibflash.com/concepts/beta), the stock's sensitivity to overall market movements. The risk premium is beta multiplied by the [equity risk premium](https://www.ibflash.com/concepts/equity-risk-premium). CAPM's output feeds directly into [WACC](https://www.ibflash.com/concepts/wacc) and therefore into every [discounted cash flow](https://www.ibflash.com/concepts/discounted-cash-flow) valuation.

    Firms That Test This

    Prepare for these firms with our firm-specific interview guides.

    Goldman SachsMorgan StanleyJ.P. MorganBank of AmericaCitigroupBarclaysDeutsche BankUBS

    Practice These Questions with AI Scoring

    Get real-time feedback on your answers — the same evaluation a VP would give you during a live interview.

    Start Free Trial

    More Interview Guides

    DCF Interview QuestionsEnterprise Value vs. Equity ValueLBO Interview QuestionsAccounting Interview QuestionsBehavioral Interview Questions for Investment BankingValuation Methods Interview QuestionsFinancial Modeling Interview QuestionsPrivate Equity Interview QuestionsHedge Fund Interview QuestionsConsulting Case Interview QuestionsRestructuring Interview QuestionsStock Pitch Interview GuideBrain Teasers & Mental Math Interview QuestionsComparable Companies Analysis (Comps) Interview QuestionsPrecedent Transactions Analysis Interview QuestionsEquity Research Interview QuestionsECM & DCM Interview QuestionsComparable Company Analysis Interview QuestionsPrecedent Transaction Analysis Interview QuestionsTerminal Value Interview QuestionsBehavioral Interview Questions for FinanceVenture Capital Interview QuestionsWACC & Discount Rate Interview QuestionsWorking Capital Interview QuestionsFinancial Ratios Interview QuestionsBrainteaser & Market Sizing Interview QuestionsPitch Book Interview QuestionsDebt Structuring & Leveraged Finance Interview QuestionsAdvanced Restructuring Interview QuestionsPaper LBO Interview Questions