Walk Me Through a Merger Model
A merger model figures out whether buying a target makes the acquirer's EPS go up (accretive) or down (dilutive). You set the price, pick the funding mix (cash/debt/stock), combine the income statements with adjustments, and divide combined net income by the new share count.
Definition
'Walk me through a merger model' asks you to explain how an acquirer buying a target affects the combined company's earnings per share (EPS) — the core output being whether the deal is accretive (EPS goes up) or dilutive (EPS goes down). The interviewer is testing whether you understand how the purchase price, the financing mix (cash, debt, stock), and the combination of the two companies' financials flow through to pro forma EPS. The headline answer is four steps: (1) determine the offer/purchase price, (2) decide how it's funded, (3) combine the two income statements with deal adjustments, and (4) compute pro forma EPS and run the accretion/dilution test.
Step 1 — Purchase Price & Offer
Start with the target's equity value: offer price per share = current share price + a control premium (typically ~20-40%). Multiply by diluted shares to get the offer equity value. State it cleanly: 'Say we offer a 30% premium to acquire the target.' This is the consideration the acquirer must fund.
Step 2 — Financing Mix (Cash, Debt, Stock)
The acquirer funds the deal with some combination of cash on hand, new debt, and newly issued stock. The mix matters enormously for accretion/dilution because each source has a different 'cost': cash forgoes interest income (low cost), new debt adds interest expense (after-tax cost of debt), and new stock dilutes the share count (cost of equity, usually the most expensive). A simple rule of thumb: cash and debt-funded deals tend to be accretive when the acquirer's cost of cash/debt is below the target's earnings yield; all-stock deals are accretive when the acquirer's P/E is higher than the target's P/E (it's buying cheaper earnings with expensive shares).
Step 3 — Combine the Statements with Adjustments
Add the two companies' pre-tax incomes (or EBIT), then layer the deal adjustments: subtract new interest expense from debt raised, subtract foregone interest income on cash used, add after-tax synergies if assumed, and subtract incremental D&A from any asset write-up and intangibles created in purchase price allocation. Tax-effect the combined pre-tax income to get pro forma net income. (Goodwill itself isn't amortized, but written-up tangible assets and finite-life intangibles create new D&A that hits earnings.)
Step 4 — Pro Forma EPS & the Accretion/Dilution Test
New share count = acquirer's existing shares + any new shares issued to fund the stock portion. Pro forma EPS = combined net income ÷ new share count. Compare to the acquirer's standalone EPS: if higher, the deal is accretive; if lower, dilutive. Bankers also compute the breakeven synergies (the synergy level needed to make a dilutive deal neutral) and the premium the buyer can afford. Accretion/dilution is a 'first screen' on whether a deal makes financial sense — it's not a measure of value creation, but boards and analysts watch it closely.
Common Follow-Ups
Expect: 'What makes a deal accretive vs dilutive?' (compare cost of financing to the yield on what you're buying; for all-stock, compare P/E multiples). 'Why might a company do a dilutive deal anyway?' (strategic value, synergies that build over time, defensive consolidation, EPS isn't everything). 'What's the impact of synergies?' (after-tax cost/revenue synergies flow straight to combined net income and push toward accretion).
Worked Example — With Real Numbers
Acquirer: net income $200M, 100M shares → standalone EPS $2.00. It acquires a target earning $50M net income, funded with $500M of new debt at 5% (after-tax cost = 5% × (1−25%) = 3.75%). New interest = $500M × 5% = $25M; after-tax cost = $25M × 0.75 = $18.75M. Combined net income = $200M + $50M − $18.75M = $231.25M. Shares unchanged (all-debt deal) = 100M. Pro forma EPS = $231.25M ÷ 100M = $2.31. EPS rose from $2.00 to $2.31 → the deal is **accretive** by ~16%. (Illustrative EXAMPLE figures.)
Key Takeaways
The core output is accretion/dilution — does combined EPS go up or down vs the acquirer standalone?
Four steps: purchase price → financing mix → combine statements with adjustments → pro forma EPS
Financing mix drives the result: stock dilutes shares, debt adds interest, cash forgoes interest income
All-stock rule of thumb: accretive if acquirer P/E > target P/E (buying cheaper earnings)
Synergies and write-up D&A are the key deal adjustments that swing the EPS result
Common Mistakes in Interviews
Forgetting deal adjustments — new interest expense, foregone interest on cash, and write-up D&A all hit EPS
Saying goodwill is amortized — it isn't; only written-up tangible assets and finite-life intangibles create new D&A
Confusing accretion/dilution with value creation — accretive deals can still destroy value and vice versa
Mixing pre-tax and after-tax: synergies and interest must be tax-effected before adding to net income
Forgetting to add new shares to the denominator in a stock-funded deal
How Interviewers Test This
Lead with the punchline — 'a merger model tells you if the deal is accretive or dilutive to the acquirer's EPS' — then walk the four steps. Have the all-stock P/E rule of thumb ready, since it's the most common follow-up. If they push, reference purchase price allocation for where write-up D&A comes from.
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