Merger Model and Accretion/Dilution Structure
Executive Summary
Key Takeaways
- ✓ A merger model requires clean, independent standalone three-statement projections for both the acquirer and the target before any combination mechanic — purchase price allocation, financing, synergies — is layered on top, since every subsequent calculation depends on those two baselines being correct and clearly separable from the pro-forma result.
- ✓ Purchase price allocation determines how the price paid in excess of the target's identifiable net assets is recorded as goodwill, and drives the incremental depreciation and amortization the combined entity carries going forward.
- ✓ The financing structure — cash, newly issued acquirer stock, new debt, or a combination — determines the pro-forma share count and incremental interest expense, both of which flow directly into the accretion/dilution result and can each independently swing the answer from accretive to dilutive.
- ✓ Synergy assumptions should be traced to specific income statement or cost lines and phased in over a stated timeline, not entered as a single aggregate addition to combined EBITDA, because an untraceable synergy figure is one of the most common ways a merger model's headline result is manipulated or overstated.
- ✓ Accretion/dilution measures the deal's effect on pro-forma earnings per share in the near term; it is not a substitute for a standalone valuation of whether the acquirer is paying a fair price, which the acquirer's own DCF or comparable company analysis of the target should independently confirm.
Institutional Definition¶
A merger model combines standalone financial projections for an acquirer and a target with the mechanics specific to a proposed acquisition — purchase price allocation, the financing structure, and expected synergies — to calculate the transaction's effect on the acquirer's pro-forma earnings per share, known as accretion/dilution analysis. This guide covers the correct build sequence in full: standalone projections first, then purchase price allocation, then the financing structure, then synergies, and finally the accretion/dilution calculation itself.
Step 1: Standalone Projections¶
Before any combination mechanic is introduced, the acquirer and target each need their own clean, independent three-statement projection, built with standard statement linking discipline. These standalone projections are the baseline every subsequent calculation is layered on top of — if either is unreliable, every downstream figure, including the final accretion/dilution result, inherits that error with no way to isolate its source. Keep the two standalone models structurally separate and clearly labelled, rather than building directly into a combined structure from the outset.
Step 2: Purchase Price Allocation¶
The price paid for the target is allocated between the target's identifiable net assets, recorded at fair value, and goodwill — the residual representing value the acquirer is paying beyond those identifiable assets. See Purchase Price Allocation for the full definition of goodwill within this allocation.
Goodwill = Purchase Price − Fair Value of Identifiable Net Assets Acquired
Where identifiable intangible assets (customer relationships, technology, brand) are separately identified and valued as part of the allocation, they typically carry their own amortization schedule, distinct from goodwill (which is not amortized under most accounting frameworks but is tested for impairment). The combined entity's post-transaction depreciation and amortization must reflect both the target's existing schedule and any new schedules arising from this allocation — see Purchase Price Allocation for the full mechanics.
Step 3: Financing Structure¶
How the transaction is funded — cash on hand, newly issued acquirer stock, new debt, or a combination — determines two inputs that flow directly into the accretion/dilution result:
| Financing Source | Effect on Pro-Forma EPS Inputs |
|---|---|
| Cash on hand | Reduces the acquirer's interest income (opportunity cost of cash used), no change to share count |
| New debt | Adds incremental interest expense, no change to share count |
| Newly issued acquirer stock | Increases pro-forma share count, no new interest expense |
Because share count and interest expense move in opposite directions between a stock-funded and a debt-funded deal, the financing mix alone can swing a transaction from accretive to dilutive, holding the purchase price and the target's own standalone performance entirely constant. This is why financing structure is treated as its own distinct build step, not folded into the purchase price allocation step above.
Step 4: Synergies¶
Synergies — cost savings or revenue benefits expected from combining the two businesses — should be traced to specific income statement or cost lines (a specific duplicated function eliminated, a specific procurement volume discount achieved) and phased in over a stated, realistic timeline, rather than entered as a single aggregate addition to combined EBITDA.
Incorrect: Combined EBITDA = Acquirer EBITDA + Target EBITDA + $50M Synergies (unexplained)
Correct: Combined EBITDA = Acquirer EBITDA + Target EBITDA
+ Procurement savings (traced, phased 40%/80%/100% over Years 1-3)
+ Duplicate function elimination (traced, phased 100% from Year 1)
An untraceable, unphased synergy figure is one of the most common ways a merger model's headline accretion/dilution result is overstated — see Synergies for the full treatment, including the distinction between cost synergies (generally more reliably achievable) and revenue synergies (generally less reliable and more frequently overestimated).
Step 5: The Accretion/Dilution Calculation¶
Pro-Forma EPS = (Acquirer Standalone Net Income + Target Standalone Net Income
+ After-Tax Synergies − After-Tax Incremental Interest Expense
− Incremental D&A from Purchase Price Allocation)
÷ Pro-Forma Diluted Share Count
Accretion / (Dilution) % = (Pro-Forma EPS ÷ Acquirer Standalone EPS) − 1
A positive result is accretive (pro-forma EPS exceeds the acquirer's standalone EPS); a negative result is dilutive. See Accretion/Dilution for the complete worked calculation and the general rule of thumb linking relative P/E multiples and financing mix to the accretion/dilution direction.
Structural Checks Specific to This Model Type¶
| Check | What It Catches |
|---|---|
| Standalone models remain separable and traceable within the combined structure | A pro-forma result that cannot be decomposed back into its acquirer, target, and deal-specific components |
| Every synergy line traces to a specific, named driver and phasing schedule | An unsupported aggregate synergy figure inflating the accretion/dilution result |
| Pro-forma share count reconciles to the stated financing mix | A stock-funded deal's dilutive share issuance silently omitted or miscounted |
| Incremental D&A from purchase price allocation flows into pro-forma net income | An accretion/dilution result that ignores the real earnings drag from acquired intangible amortization |
| Incremental interest expense reflects the actual incremental debt at the deal's actual cost of debt | A debt-funded deal's financing cost understated by using the acquirer's pre-deal average cost of debt rather than the marginal cost of new acquisition debt |
Relationship to Valuation¶
Accretion/dilution analysis measures a deal's near-term effect on the acquirer's earnings per share — a financing and structuring question. It does not, by itself, answer whether the acquirer is paying a fair price for the target, which is a valuation question independently addressed through the target's own DCF, comparable company analysis, or precedent transactions analysis. A deal can be accretive and still overpriced, or dilutive and still strategically and financially sound depending on the acquirer's investment horizon and strategic rationale — the two questions should always be assessed independently, not conflated.
Continue Reading¶
Prerequisites¶
- Corporate Financial Modelling — the parent pillar
- Statement Linking Mechanics
Related Glossary¶
Related Technical Guides¶
Related Checklists¶
Related Pillars¶
Related Case Studies¶
How OXXON tests thisRun a free structural check with FMAE
Frequently Asked Questions
What is a merger model?
A financial model that combines an acquirer and a target's standalone financial projections with the mechanics specific to a proposed acquisition — purchase price allocation, the financing structure, and expected synergies — to calculate the deal's effect on the acquirer's pro-forma earnings per share, known as accretion/dilution analysis.
What is accretion/dilution analysis?
A comparison of the acquirer's pro-forma (post-transaction, combined) earnings per share against its standalone (pre-transaction) earnings per share. A deal is accretive if pro-forma EPS is higher than standalone EPS, and dilutive if it is lower — see Accretion/Dilution for the full calculation.
Why must standalone acquirer and target projections be built before any combination mechanic?
Because every subsequent calculation — purchase price allocation, pro-forma financing, synergy phasing, the accretion/dilution result itself — is built on top of these two baselines. If either standalone projection is unreliable, every downstream calculation inherits that error, and there is no way to isolate whether a pro-forma result reflects the deal's genuine economics or an error already present in one of the standalone models.
What is purchase price allocation, and what does it determine?
The process of allocating the price paid for a target between its identifiable net assets (at fair value) and goodwill, the residual representing value the acquirer is paying for beyond those identifiable assets. It determines the incremental depreciation and amortization the combined entity carries going forward — see Purchase Price Allocation.
How does the financing structure affect the accretion/dilution result?
The financing structure determines two inputs that flow directly into accretion/dilution — the pro-forma share count (increased if the acquirer issues new stock to fund the deal) and incremental interest expense (increased if the acquirer takes on new debt). Both an all-stock deal and an all-debt deal can independently swing a transaction from accretive to dilutive relative to an all-cash alternative, even holding the purchase price and target's own performance constant.
How should synergy assumptions be built into a merger model?
Traced to specific income statement or cost lines — a specific overlapping function eliminated, a specific procurement saving identified — and phased in over a stated, realistic timeline, rather than entered as a single aggregate addition to combined EBITDA with no supporting detail. An untraceable synergy figure is one of the most common ways a merger model's headline accretion/dilution result is overstated.
Does a merger model replace the need for a standalone valuation of the target?
No. Accretion/dilution measures the deal's near-term effect on the acquirer's earnings per share, which is a financing and structuring question, not a valuation question. Whether the acquirer is paying a fair price for the target should be independently assessed through a standalone DCF, comparable company analysis, or precedent transactions analysis of the target — see the existing Discounted Cash Flow Valuation pillar.
How is a merger model different from an LBO model?
Both are transaction models built on top of standalone three-statement projections, but they answer different questions. A merger model tests the near-term EPS effect of a strategic acquirer combining with a target. An LBO model tests the internal rate of return a financial sponsor achieves by acquiring a target with a high proportion of debt and exiting after a defined hold period — see the existing How to Build an LBO Valuation guide.
Related Articles
Corporate Financial Modelling
Corporate financial modelling is the discipline of building financial models for operating companies — as distinct from a single asset, project, or development. Nearly every corporate model type is built on the same foundation, a fully integrated three-statement structure, and then specializes that foundation toward a specific purpose: a budget model constrains it to a fixed annual period, a driver-based model rebuilds it from operational units rather than percentage growth, a consolidation model extends it across multiple legal entities and currencies, a management reporting model extracts and re-presents its outputs as KPIs, and a transaction model (a merger model, an LBO) repurposes it to answer a specific capital-structure or ownership-change question. This page is the hub for the Knowledge Centre's corporate financial modelling content: the shared three-statement foundation, how each model type specializes it, and where each mechanic is covered in full technical depth elsewhere on this platform.
Purchase Price Allocation
Purchase price allocation (PPA) is the process, required under both IFRS and US GAAP acquisition accounting, of allocating the price paid for an acquired business between its identifiable net assets, recorded at fair value as of the acquisition date, and goodwill, the residual representing value the acquirer paid beyond those identifiable assets. The allocation directly determines the combined entity's post-transaction depreciation and amortization, since revalued tangible assets and newly recognized intangible assets each carry their own schedule going forward, distinct from goodwill, which is not amortized but is tested periodically for impairment.
Synergies
Synergies are the cost savings or revenue benefits a combined entity is expected to achieve that neither the acquirer nor the target could achieve standalone — eliminating a duplicated corporate function, negotiating better procurement terms at greater combined scale, or cross-selling one company's products through the other's customer base. In a merger model, synergies should be traced to specific, named drivers and phased in over a stated, realistic timeline rather than entered as a single aggregate addition to combined EBITDA, since an untraceable synergy figure is one of the most common ways a deal's headline accretion is overstated.
Accretion/Dilution
Accretion/dilution analysis compares an acquirer's pro-forma (post-transaction, combined) earnings per share against its standalone (pre-transaction) earnings per share to determine whether a proposed acquisition would increase (accretive) or decrease (dilutive) the acquirer's EPS. It is the headline output of a merger model, and depends on the combined entity's pro-forma net income (driven by both companies' standalone earnings, synergies, and incremental depreciation and interest from the deal itself) and the pro-forma diluted share count (driven by the financing mix).
How to Build an LBO Valuation
Building an LBO-implied valuation requires constructing a full leveraged buyout model and solving it backward for the entry price consistent with a target return. This guide walks through the build in order — the sources and uses of funds, the opening debt and equity structure, the debt paydown mechanics over the hold period, the exit multiple assumption, and the final step of solving for the maximum entry price at a target IRR or multiple of money — along with the structural checks that confirm the model is internally consistent and the resulting entry price is defensible.
Acquisition Model Checklist
This checklist covers the structural checks specific to acquisition and M&A models, on top of the general financial model audit baseline. It focuses on the mechanics unique to deal models — synergy assumption traceability, purchase price allocation, debt and equity funding structures, and consistency between standalone and pro-forma combined entity figures. It is intended for buy-side and sell-side teams, and advisors, reviewing a model ahead of a transaction decision.
LBO Valuation
LBO-implied valuation derives the maximum price a financial sponsor could pay for a target and still achieve a target internal rate of return or multiple of money at a defined exit, given an assumed capital structure and debt paydown schedule over the hold period. Unlike DCF, comparable company analysis, or asset-based valuation, which each build a value estimate forward from cash flows, market multiples, or assets, LBO valuation works backward from a required return — it is properly understood as an implied-value technique used alongside the three classical valuation approaches in a private equity context, not as a substitute for them.
Three-Statement Model
A three-statement model is a financial model in which the income statement, balance sheet, and cash flow statement are dynamically linked into a single integrated system, so that a change in any assumption flows through correctly to all three, and the balance sheet balances in every forecast period as a direct consequence of that linkage rather than as a plug engineered to force it. It is the structural foundation most other financial models — DCF, LBO, project finance — are built on top of.
Diluted Share Count
Diluted share count is the number of shares used as the divisor when converting total equity value into value per share, and it differs from basic shares outstanding by including the potential dilutive effect of options, warrants, convertible debt, and convertible preferred stock. Options and warrants are incorporated using the treasury stock method; convertible securities are incorporated using the if-converted method, which also requires adding back the interest or dividend the company would no longer pay if conversion occurred. Using the correct diluted share count is the final step in a DCF's enterprise-to-equity value bridge, and understating dilution is a common source of overstated value per share.
Enterprise Value (EV)
Enterprise value (EV) is the total value of a company's core operating business, independent of its capital structure — it represents what the business as a whole is worth to all capital providers combined, before distinguishing between debt and equity claims. Enterprise value is the direct output of discounting unlevered free cash flow (FCFF) at WACC. To move from enterprise value to the value attributable to equity holders specifically, net debt, minority interests, and other non-operating adjustments must be deducted — the enterprise-to-equity bridge.