M&A and Merger Model Interview Questions Guide

M&A questions separate candidates who understand banking from candidates who memorized flashcards, because merger math forces you to combine everything else: accounting, valuation, and capital structure, inside one framework. Accretion/dilution is the signature topic, and interviewers use it because it can be asked at every level of difficulty, from a conceptual rule of thumb to a full pro forma EPS calculation in your head.

The core question a merger model answers is simple: after the acquirer pays for the target, issues whatever financing the deal requires, and absorbs the target's earnings, is pro forma earnings per share higher or lower than it would have been standalone? Everything in this guide builds toward answering that fluently. Real bank questions are appended below the article for practice.

What Interviewers Actually Test

First, mechanics: can you walk through a merger model, compute simple accretion/dilution, and explain what changes with cash, debt, or stock consideration. Second, accounting: goodwill, asset write-ups, and deferred taxes created in a deal. Third, judgment: why companies acquire, what makes synergies credible, and the crucial distinction between EPS accretion and actual value creation.

The best interviewers end with that last one. A deal can be accretive and still destroy value if the acquirer overpays, and a dilutive deal can create enormous value. Accretion/dilution is an earnings-mechanics screen, not a valuation. Candidates who volunteer that distinction, unprompted, signal they think like bankers rather than test-takers.

Accretion/Dilution: The Core Mechanics

A deal is accretive if pro forma EPS exceeds the acquirer's standalone EPS, and dilutive if it is lower. Pro forma net income equals the acquirer's net income, plus the target's net income, plus after-tax synergies, minus after-tax incremental costs of the deal: foregone interest on cash used, interest on new debt, and incremental D&A from any write-ups. Pro forma shares equal the acquirer's shares plus any new shares issued to fund the deal. Divide and compare.

The quick screens follow from comparing the cost of each funding source to the target's earnings yield, the inverse of the P/E paid:

• All-stock deal: accretive, before synergies and deal adjustments, if the acquirer's P/E is higher than the P/E paid for the target; the acquirer is exchanging expensive shares for cheaper earnings.
• Cash or debt deal: accretive, before synergies, if the target's earnings yield (net income / price paid) exceeds the after-tax cost of the funding, meaning the after-tax interest rate on new debt or the after-tax interest income foregone on cash.
• Effective cost of each source: cash costs the after-tax interest income you give up, debt costs the after-tax interest rate you pay, and stock effectively costs the acquirer's earnings yield (inverse of its P/E).
• Cash is usually the cheapest funding source and stock the most expensive, though this depends on interest rates and the acquirer's multiple, so hedge accordingly.
• Always state the caveat: these rules ignore synergies, transaction fees, and purchase accounting adjustments, any of which can flip the answer.

Purchase Accounting: Goodwill, Write-Ups, and Deferred Taxes

In an acquisition, the purchase price is allocated to the target's identifiable assets and liabilities at fair value. Goodwill is the plug: the excess of the equity purchase price over the fair value of the target's net identifiable assets, after writing assets up or down and recognizing identifiable intangibles like customer relationships. The target's existing goodwill and equity are wiped out in consolidation.

Two follow-ups appear constantly. First: why does goodwill exist? Because acquirers pay for things that do not sit on the balance sheet, expected synergies, brand, workforce, and a control premium. Under US GAAP, goodwill of public companies is not amortized; it is tested for impairment, while finite-lived intangible write-ups are amortized, creating an earnings drag with no cash cost.

Second: deferred taxes. In a typical stock acquisition, asset write-ups increase book depreciation and amortization but not tax depreciation, since the tax basis carries over. Book taxes fall below cash taxes, so a deferred tax liability is created, commonly estimated as the write-up times the tax rate. In an asset purchase (or a deal treated as one for tax purposes), the tax basis steps up too, the write-ups are tax-deductible, and no such DTL arises. Tax treatment varies by deal structure, so flag the assumption when you answer.

The Classic Questions and How to Think About Them

Walk me through a merger model: start with assumptions (purchase price and premium, consideration mix, synergies, fees), build sources and uses, adjust the combined balance sheet (write-ups, goodwill, new debt or shares, DTLs), combine the income statements with deal adjustments (synergies, incremental interest, foregone interest, incremental D&A), and compute pro forma EPS versus standalone to measure accretion or dilution. Deliver it as an ordered sequence, just like the DCF walk-through.

Why would one company buy another? Organize the answer: strategic reasons (market access, capabilities, consolidation, defense) and financial reasons (synergies, undervaluation). Then add the discipline point: the deal creates value only if the value of synergies and improvements exceeds the premium paid. Similarly, when asked whether a company should do an accretive deal, resist the bait: accretion is neither necessary nor sufficient for value creation.

Synergy questions reward specificity. Cost synergies (headcount overlap, facilities, procurement) are more credible and more commonly achieved than revenue synergies (cross-selling, pricing), and markets typically discount revenue synergies accordingly. If asked how synergies affect the math, remember they enter pro forma net income after tax. The live bank questions below this guide let you drill each of these families at increasing difficulty.

Common Mistakes

M&A questions have well-worn failure modes, and most of them come from applying a shortcut without its caveats.

• Quoting the P/E rule for stock deals without the pre-synergies caveat, or using the target's unaffected P/E instead of the P/E based on the price actually paid.
• Forgetting foregone interest on cash, treating the acquirer's cash as free money.
• Forgetting to add newly issued shares to the pro forma share count in stock deals.
• Confusing accretion with value creation, or being unable to explain why they differ.
• Computing goodwill off book equity without adjusting for fair-value write-ups and new intangibles.
• Ignoring the deferred tax liability created by write-ups in stock deals, or applying it to asset deals where the basis steps up.

How to Prepare

Merger math is a skill you build by doing small numeric examples repeatedly, not by rereading the rules. Make up simple numbers, two P/Es, a funding mix, an interest rate, and compute accretion or dilution in your head until the screens are instinct.

Then keep the conceptual layer sharp with active recall; the M&A deck in WACC Buddy sequences real bank questions from quick screens up to full pro forma walk-throughs.

1. 01Master the accretion/dilution screens for cash, debt, and stock, and practice stating each with its caveats in one sentence.
2. 02Do five-minute mental math reps: given two P/Es or an interest rate and an earnings yield, call accretive or dilutive and say why.
3. 03Learn the purchase accounting chain: allocation, write-ups, goodwill as the plug, DTL creation, and the earnings drag from intangible amortization.
4. 04Rehearse the merger model walk-through aloud as an ordered sequence.
5. 05Prepare a view on one real deal you can discuss: rationale, consideration, and whether you think it created value.

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