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What is a Merger Model?

A merger model (also called a merger consequences analysis or accretion/dilution analysis) is a financial model that answers the fundamental question in any acquisition: “What happens to the acquirer’s earnings per share (EPS) when they buy the target?” If pro forma EPS goes up, the deal is accretive (good for shareholders). If it goes down, the deal is dilutive (requires justification). The mechanics work like this: when Company A buys Company B, Company A gains Company B’s net income (plus expected synergies) but also incurs costs — the financing expense of debt raised to fund the deal, the dilution from new shares issued if paying with stock, the amortization of intangible assets created in purchase price allocation, and the loss of interest income on cash used. The merger model combines all of these effects to calculate whether the combined entity earns more or less per share than the acquirer did alone. Merger models are built for every M&A transaction at every investment bank. They are a core component of board presentations, fairness opinions, proxy statements, and negotiation discussions. An investment banking analyst will typically build dozens of merger models during their first two years.

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Why It Matters

  • Board-level decision making: The acquirer’s board of directors needs to see accretion/dilution before approving any deal. A significantly dilutive deal requires compelling strategic justification
  • Negotiation tool: Sensitivity tables showing accretion/dilution at different prices and synergy levels help both sides understand the economics during negotiations
  • Fairness opinions: The financial advisor’s formal opinion on whether a deal is “fair” to shareholders relies heavily on merger model outputs
  • Deal structure optimization: Merger models help determine the optimal cash/stock mix, how much debt to raise, and what synergy targets are needed for the deal to work financially
  • Regulatory filings: Accretion/dilution data appears in proxy statements filed with the SEC

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Key Concepts

TermDefinition
AccretivePro forma EPS is higher than standalone EPS — the deal adds value per share
DilutivePro forma EPS is lower than standalone EPS — the deal reduces value per share
Sources & UsesHow the deal is funded (sources: cash, debt, stock) and where the money goes (uses: equity purchase, debt payoff, fees)
SynergiesCost savings or revenue enhancements expected from combining the two companies
Purchase Price Allocation (PPA)Accounting exercise that allocates the purchase price to identifiable assets, with the remainder as goodwill
GoodwillThe premium paid over the fair value of identifiable assets — tested annually for impairment
Intangible AmortizationNon-cash expense from amortizing identified intangible assets (customer relationships, technology, brand)
Breakeven SynergiesThe minimum synergies needed for the deal to be EPS-neutral in Year 1
Exchange RatioIn a stock deal, the number of acquirer shares issued per target share

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Worked Example: Acme Corp Acquires WidgetTech

Walk through a complete merger model from inputs to accretion/dilution.

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Step 1: Gather Inputs

Acquirer: Acme Corp (ACM)
MetricValue
Share Price$50.00
Shares Outstanding200M
Market Cap$10.0B
Net Income (NTM)$800M
EPS (NTM)$4.00
P/E Multiple12.5x
Pre-tax Cost of Debt5.5%
Tax Rate25%
Cash on Balance Sheet$2.0B
Existing Debt$3.0B
Target: WidgetTech (WDGT)
MetricValue
Share Price$30.00
Shares Outstanding50M
Market Cap$1.5B
Net Income (NTM)$100M
EPS (NTM)$2.00
P/E Multiple15.0x
Net Debt$200M
Deal Terms:
TermValue
Offer Price$40.00 per share (33% premium)
Consideration50% cash / 50% stock
New Debt$800M at 5.5%
Expected Cost Synergies$50M pre-tax (Year 2 run-rate)
Synergy Phase-in50% in Year 1, 100% in Year 2
Transaction Fees$50M
Financing Fees16M(216M (2% of 800M debt)
PPA: Intangible Assets$500M (amortized over 10 years)

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Step 2: Purchase Price Analysis

Offer price per share:          $40.00
Premium to current price:       33.3% ($40 / $30 - 1)

Equity Value:                   $40 x 50M shares = $2,000M
Plus: Net Debt Assumed:         $200M
Enterprise Value:               $2,200M

Implied EV/EBITDA:              $2,200M / $180M = 12.2x
Implied P/E:                    $2,000M / $100M = 20.0x

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Step 3: Sources and Uses

SOURCES                          USES
─────────────────────            ─────────────────────
New Debt         $800M           Equity Purchase    $2,000M
Cash on Hand     $266M           Refinance Debt      $200M
New Shares       $1,000M         Transaction Fees     $50M
(20M shares x $50)               Financing Fees       $16M
─────────────────────            ─────────────────────
Total Sources    $2,066M         Total Uses         $2,266M

Wait -- Sources don't equal Uses. Adjust:
Cash on Hand needs to be: $2,266M - $800M - $1,000M = $466M
But Acme only has $2,000M in cash.

Revised:
New Debt         $1,066M         Equity Purchase    $2,000M
Cash on Hand     $200M           Refinance Debt      $200M
New Shares       $1,000M         Transaction Fees     $50M
                                  Financing Fees       $16M
─────────────────────            ─────────────────────
Total Sources    $2,266M         Total Uses         $2,266M  ✓

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Step 4: Pro Forma EPS Calculation

                                    Year 1      Year 2
Acquirer Standalone Net Income      $800M       $840M
Target Net Income                   +$100M      +$105M
Cost Synergies (50M pre-tax)
  Year 1: 50% phase-in             +$18.75M    ─
  Year 2: 100% run-rate            ─            +$37.5M
  (after-tax: $50M x phase-in x (1-25%))

Foregone Interest on Cash Used
  $200M x 5.5% x (1-25%)          -$8.25M     -$8.25M

New Debt Interest
  $1,066M x 5.5% x (1-25%)        -$43.95M    -$43.95M

Intangible Amortization
  $500M / 10 years x (1-25%)      -$37.5M     -$37.5M

Pro Forma Net Income               $829.05M    $892.80M

Standalone Shares                   200M        200M
New Shares Issued                   +20M        +20M
Pro Forma Shares                    220M        220M

STANDALONE EPS                      $4.00       $4.20
PRO FORMA EPS                      $3.77       $4.06

ACCRETION / (DILUTION)             ($0.23)     ($0.14)
ACCRETION / (DILUTION) %           (5.8%)      (3.3%)
Key insight: This deal is dilutive in both Year 1 and Year 2, primarily because:
  1. Acme is paying 20x P/E for a target (WidgetTech’s implied P/E at the offer price) when Acme itself only trades at 12.5x P/E. Buying a higher-multiple company with stock is inherently dilutive.
  2. Intangible amortization of $37.5M per year (after tax) is a significant drag on pro forma EPS.

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Step 5: Sensitivity Analysis

Accretion/Dilution vs. Synergies and Offer Premium:
$0M Syn$25M Syn$50M Syn$75M Syn$100M Syn
20% premium ($36)(3.2%)(1.5%)0.2%1.9%3.6%
25% premium ($37.50)(4.1%)(2.4%)(0.7%)1.0%2.7%
33% premium ($40.00)(7.5%)(5.8%)(4.1%)(2.4%)(0.7%)
40% premium ($42.00)(9.3%)(7.6%)(5.9%)(4.2%)(2.6%)
Note: Highlighted cell is the base case ($50M synergies, 33% premium). The deal is dilutive under most reasonable assumptions. Accretion/Dilution vs. Cash/Stock Mix:
100% Cash75/2550/5025/75100% Stock
Year 1(3.8%)(4.5%)(5.8%)(7.1%)(8.4%)
Year 2(0.8%)(1.5%)(3.3%)(4.8%)(6.1%)
Key insight: More cash = less dilution (because you issue fewer shares). But more cash means more debt, which means more interest expense. The optimal structure depends on the acquirer’s cost of debt vs. cost of equity.

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Step 6: Breakeven Synergies

What is the minimum pre-tax synergies needed for EPS neutrality in Year 1?

Set Pro Forma EPS = Standalone EPS and solve for synergies:

Pro Forma Net Income = Standalone Net Income
$800M + $100M + Synergies(AT) - $8.25M - $43.95M - $37.5M = $800M / (200/220)

Simplified:
$810.3M + Synergies(AT) = $800M x (220/200) = $880M

Synergies(AT) = $880M - $810.3M = $69.7M

Pre-tax synergies = $69.7M / (1 - 25%) = $92.9M

BREAKEVEN SYNERGIES: ~$93M pre-tax

Management is projecting $50M. The deal requires 86% more synergies
than projected to break even in Year 1. This is a key discussion
point for the board.

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Step 7: One-Page Summary

MERGER CONSEQUENCES SUMMARY
Acme Corp (ACM) Acquisition of WidgetTech (WDGT)

TRANSACTION OVERVIEW:
Offer Price: $40/share (33% premium)
Equity Value: $2.0B | Enterprise Value: $2.2B
Consideration: 50% Cash / 50% Stock
Implied Multiples: 12.2x EV/EBITDA, 20.0x P/E

ACCRETION / (DILUTION):
                Year 1      Year 2
Pro Forma EPS   $3.77       $4.06
Standalone EPS  $4.00       $4.20
Accr/(Dil) %    (5.8%)      (3.3%)

BREAKEVEN SYNERGIES: $93M pre-tax
(vs. $50M management estimate -- deal is dilutive even with
full synergies at management projection level)

KEY CONSIDERATIONS:
1. Deal is dilutive in Year 1-2 under base case assumptions
2. At management's $50M synergy estimate, the deal remains
   dilutive through Year 2
3. A higher cash component (75/25) reduces dilution to (4.5%)
4. Strategic rationale must justify 3-6% dilution to the board
5. If acquirer multiple were 15x (vs. current 12.5x), deal
   would be approximately EPS-neutral at $50M synergies

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Full Skill Workflow (From SKILL.md)

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Phase 1: Gather Inputs

Acquirer data: Share price, shares outstanding, NTM EPS (GAAP and adjusted), P/E multiple, pre-tax cost of debt, tax rate, cash on balance sheet, existing debt. Target data: Share price (if public), shares outstanding, NTM EPS or net income, enterprise value, net debt. Deal terms: Offer price or premium, consideration mix (% cash vs. % stock), new debt to raise, expected synergies and phase-in, transaction fees and financing fees, PPA assumptions (intangible value and amortization period), expected close date.

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Phase 2: Purchase Price Analysis

Calculate: offer price per share, premium to current, equity value, enterprise value, and implied multiples (EV/EBITDA, P/E).

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Phase 3: Sources and Uses

Build the funding table. Sources must equal uses. Common sources: new debt, cash on hand, new equity issued. Common uses: equity purchase price, refinance target debt, transaction fees, financing fees.

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Phase 4: Pro Forma EPS Calculation

Year-by-year (Year 1-3):
  1. Start with acquirer standalone net income
  2. Add target net income
  3. Add synergies (after tax, with phase-in schedule)
  4. Subtract foregone interest on cash used (after tax)
  5. Subtract new debt interest expense (after tax)
  6. Subtract intangible amortization (after tax)
  7. Divide by pro forma share count (standalone + new shares)
  8. Compare to standalone EPS for accretion/dilution percentage

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Phase 5: Sensitivity Analysis

Build two sensitivity tables:
  • Accretion/Dilution vs. Synergies and Offer Premium: Vary synergy amounts across columns and premium levels across rows
  • Accretion/Dilution vs. Cash/Stock Mix: Vary consideration mix from 100% cash to 100% stock

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Phase 6: Breakeven Synergies

Calculate the minimum pre-tax synergies for EPS neutrality in Year 1. This is a key negotiation data point.

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Phase 7: Deliver Output

Excel workbook with: assumptions tab, sources and uses, pro forma income statement, accretion/dilution summary, sensitivity tables, and breakeven analysis. Plus a one-page merger consequences summary for pitch book use.

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Common Mistakes (and How to Avoid Them)

What goes wrong: Acme uses 200Mofcashtofundthedeal.ThemodeladdstargetnetincomebutdoesnotsubtracttheinterestincomeAcmewasearningonthat200M of cash to fund the deal. The model adds target net income but does not subtract the interest income Acme was earning on that 200M. Pro forma EPS is overstated.How to avoid it: Always calculate: Cash Used x Pre-tax Interest Rate x (1 - Tax Rate) and subtract from pro forma income. Even at low rates (2-3%), 200Mofcashgenerates200M of cash generates 3-4.5M of after-tax income that is lost when the cash is spent.
What goes wrong: The model projects 50Mofrun−ratesynergiesandappliesthefull50M of run-rate synergies and applies the full 50M in Year 1. In reality, synergies take time to achieve — restructuring must occur, systems must be integrated, and cost savings must materialize. Year 1 typically captures only 25-50% of run-rate synergies.How to avoid it: Apply a phase-in schedule: 25-50% in Year 1, 75-100% in Year 2, 100% in Year 3. For the pitch book, show accretion/dilution both with and without synergies so the board can assess the deal on standalone economics.
What goes wrong: The model calculates accretion on a cash EPS basis (excluding intangible amortization) and presents it as “the deal is accretive.” But GAAP EPS includes amortization, and the deal is actually dilutive on a GAAP basis. The board sees a different number in the proxy statement.How to avoid it: Show both GAAP and adjusted (cash) EPS. GAAP includes intangible amortization. Adjusted excludes it. Many boards focus on cash EPS, but the proxy statement reports GAAP. Present both so there are no surprises.
What goes wrong: The sources total 2.1Bandtheusestotal2.1B and the uses total 2.3B. There is a 200Mgap.Eitherthedealneeds200M gap. Either the deal needs 200M more debt, $200M more equity, or the assumptions are wrong. The model is broken but the error is not caught.How to avoid it: Build a formula check: =Sources - Uses. This cell should always equal zero. If it does not, the model has an error. This is the most basic integrity check in a merger model.
What goes wrong: The acquirer issues 20M new shares to fund the stock portion of the deal. The model calculates pro forma net income correctly but divides by 200M shares (standalone) instead of 220M shares (pro forma). EPS is overstated by 10%.How to avoid it: Pro forma shares = standalone shares + new shares issued. The new shares issued = stock consideration / acquirer share price. Double-check this calculation — it is the denominator of the entire accretion/dilution analysis.
What goes wrong: Synergies are taxed at 25%, interest adjustments at 21%, and amortization at 28%. Three different tax rates for items that should all use the acquirer’s marginal rate. The result is internally inconsistent.How to avoid it: Use one tax rate (the acquirer’s marginal tax rate) for all adjustments: synergies, foregone interest, new debt interest, and intangible amortization. Typically 25% for US companies (21% federal + state).
What goes wrong: The merger model shows the deal is dilutive, but the presentation does not include the breakeven synergy number. The board asks “how much more savings do we need to make this work?” and the analyst cannot answer immediately.How to avoid it: Always calculate and prominently display the breakeven synergy number. This is the single most important negotiation data point. If breakeven synergies are 93Mbutmanagementprojects93M but management projects 50M, the board needs to understand that gap.
What goes wrong: The acquirer trades at 12.5x trailing P/E but the model uses forward P/E for the accretion/dilution calculation. The comparison periods are mismatched, making the result unreliable.How to avoid it: Use NTM (next twelve months) EPS for both the acquirer standalone and the pro forma. This ensures an apples-to-apples comparison. If using LTM, use LTM for both. Never mix trailing and forward.
What goes wrong: The model shows one deal structure (50/50 cash/stock). The board asks “what if we used more cash?” or “what if we offered more stock?” and the analyst has to rebuild the model from scratch.How to avoid it: Build the sensitivity table for cash/stock mix from the start (100% cash to 100% stock in 25% increments). This shows the board how deal structure affects shareholder value and enables real-time negotiation support.
What goes wrong: The model shows 5.8% dilution in Year 1. The board rejects the deal because “it is dilutive.” But the strategic value (market entry, technology acquisition, competitive elimination) is worth far more than 5.8% EPS dilution.How to avoid it: Always present accretion/dilution alongside strategic rationale. “The deal is 5.8% dilutive in Year 1, but the acquisition provides: (1) entry into a $3B adjacent market, (2) proprietary technology that would take 3-5 years to develop internally, and (3) elimination of our most disruptive competitor. The NPV of these strategic benefits exceeds the dilution.”

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Practice Exercise

Exercise: Build a Merger Model Mega Industries (MEGA) is considering acquiring SmallCo (SMCO). Acquirer (MEGA): Share price 80,500Msharesoutstanding,NTMnetincome80, 500M shares outstanding, NTM net income 2.0B, NTM EPS 4.00,pre−taxcostofdebt6.04.00, pre-tax cost of debt 6.0%, tax rate 25%, cash on balance sheet 5.0B. Target (SMCO): Share price 25,100Msharesoutstanding,NTMnetincome25, 100M shares outstanding, NTM net income 200M, net debt $500M. Deal terms: 30% premium (32.50/share),6032.50/share), 60% cash / 40% stock, expected synergies 80M pre-tax (50% Year 1, 100% Year 2), transaction fees 75M,financingfees75M, financing fees 20M, PPA intangibles $800M (15-year amortization). Task 1: Calculate the purchase price analysis (equity value, enterprise value, implied multiples). Task 2: Build the sources and uses table. Verify sources = uses. Task 3: Calculate pro forma EPS for Year 1 and Year 2. Is the deal accretive or dilutive? Task 4: Calculate breakeven synergies. Are management’s projected synergies ($80M) sufficient? Task 5: Build the sensitivity table for accretion/dilution at different premium levels (20%, 25%, 30%, 35%, 40%) and synergy levels (0M,0M, 40M, 80M,80M, 120M, $160M).

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How to Add to Your Local Context

claude plugin install investment-banking@financial-services-plugins

{
  "mcpServers": {
    "market-data": {
      "command": "market-data-mcp",
      "args": ["--provider", "bloomberg"]
    }
  }
}

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Best Practices

  • Include purchase price allocation: Goodwill and intangible amortization matter for GAAP EPS
  • Synergy phase-in is critical: Year 1 typically captures only 25-50% of run-rate synergies
  • Do not forget foregone interest: Cash used to fund the deal was earning interest
  • Tax rate consistency: All adjustments should use the acquirer’s marginal tax rate
  • Show the breakeven clearly: Boards want to know the minimum needed for the deal to work
  • Test multiple structures: Run cash/stock mix sensitivity to show structural impact

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Dependencies

Required:
  • XLSX skill for Excel model creation
Optional:
  • Market data for real-time share prices
  • Financial data for consensus estimates