Resource
Merger model guide
How to build a merger model that tests pro forma capitalisation, accretion / dilution and financing mix — the mechanics that determine whether a transaction adds to the surviving shareholder’s earnings.
Written by CA Pranay Bhansali, Founder & Principal, Volaxi — Chartered Accountant (ICAI), former senior buy-side research analyst.
Last reviewed September 2026 · LinkedIn
The guide in summary
| Topic | What it covers |
|---|---|
| Purpose | Merger models test EPS accretion/dilution for a combined entity. |
| Capitalisation | Pro forma structure balances sources and uses of funds. |
| Accretion/Dilution | Comparison of combined versus standalone earnings determines transaction impact. |
| Financing Mix | Choice of cash, debt or equity shifts deal impact and leverage. |
| Synergies | Conservative phasing of synergies is critical to realistic model outputs. |
| PPA Link | Intangible amortisation and goodwill directly affect combined pro forma earnings. |
| Review | Model robustness relies on traceable reconciliations and consistent assumptions. |
01
What a merger model is testing
A merger model tests whether a combination of two businesses is financially viable under a given offer structure and financing mix. It combines the acquirer and target into a single pro forma entity, then compares the combined earnings per share to the acquirer’s standalone EPS to determine whether the transaction is accretive or dilutive.
The model is not a valuation of the target on its own. It is a deal-execution tool that answers a narrower question: given the price, the consideration mix, the debt raised and the synergies assumed, does the transaction improve earnings for the surviving shareholders? If it does not, the model shows which lever — price, debt, equity or synergies — must move.
02
Pro forma capitalisation
The first mechanical step is to build the combined capitalisation. The acquirer and target balance sheets are laid out side by side, then adjusted for the transaction mechanics at close.
Purchase price
Offer price per share multiplied by diluted shares, plus debt to be refinanced and transaction fees.
Sources of funds
Cash on hand, new debt issuance, equity issued to target shareholders and any preferred or convertible instrument.
Uses of funds
Payment to target shareholders, refinancing of target debt, repayment of fees and other transaction costs.
Goodwill and intangibles
The excess purchase price over the fair value of net identifiable assets, split between goodwill and separately valued intangibles.
Combined equity
Acquirer’s existing equity plus new shares issued, adjusted for any repurchased or cancelled target shares.
03
Accretion / dilution analysis
Accretion / dilution compares the acquirer’s standalone EPS to the combined pro forma EPS. A transaction is accretive when combined EPS exceeds standalone EPS; it is dilutive when it falls short. The calculation is straightforward in principle, but the adjustments make or break the conclusion.
Standalone EPS
Acquirer net income divided by diluted shares outstanding before the transaction.
Combined net income
Acquirer net income plus target net income, less incremental interest, foregone interest on cash, new depreciation and amortisation, and tax effects.
Share count impact
New equity issued increases the denominator; the exact share count depends on the exchange ratio and any convertibles.
Synergy contribution
Cost and revenue synergies are phased in and taxed; only those that are expected to be realised should be included.
Diluted share treatment
Options, restricted stock and convertible instruments must be included on a combined basis.
04
Financing mix scenarios
The financing mix is the most controllable driver of accretion / dilution. Debt is usually the most accretive source because it replaces equity with a fixed cost of interest; equity is the least accretive because it dilutes the denominator. Cash sits between the two, depending on the opportunity cost of deploying it.
All-cash offer
Lowest share-count impact, but consumes liquidity and may require new debt to fund it.
All-equity offer
Preserves acquirer cash but maximises denominator dilution; often used when target shareholders want continued exposure.
Debt-financed cash
Most accretive if the target’s return on invested capital exceeds the after-tax cost of debt — but adds leverage and covenant pressure.
Mixed consideration
Balances liquidity, dilution and leverage; common in public and cross-border transactions.
Contingent / earn-out consideration
Deferred or performance-linked payments reduce initial cash outflow and align management, but create complexity and earn-out liability.
05
Synergy phasing and risk
Synergies are the only place where a merger model becomes forward-looking rather than mechanical. Revenue synergies are usually the hardest to justify and the last to arrive; cost synergies are more predictable but are bounded by the target’s cost base. A disciplined model separates the two, phases them conservatively and applies a probability haircut where the case is uncertain.
Synergies should be linked to the same EBITDA definition used in the transaction and debt covenants. They must be taxed and must include any implementation costs or one-time charges. A common error is to show run-rate synergies immediately without phasing, which overstates the first-year accretion.
06
Link to purchase price allocation
The merger model and the purchase price allocation cannot be built independently. The PPA determines the intangible assets and goodwill on the opening balance sheet, which in turn drives incremental amortisation expense in the accretion / dilution calculation. A high allocation to identifiable intangibles creates more amortisation than goodwill, which reduces pro forma earnings.
Deferred tax assets and liabilities from the PPA also affect combined net income and the tax shield on new debt. The model should pull the same opening balance sheet and depreciation / amortisation assumptions that the valuation and PPA work produces, so that a reviewer can trace the numbers from the offer to the combined EPS.
07
Review questions for a merger model
A merger model is only useful if the mechanics can be traced. Before the model is presented to a committee or counterparty, test the following.
Balance sheet reconciliation
Does the combined balance sheet balance at close and in every forecast period?
Standalone vs combined comparability
Are acquirer and target accounting periods, EBITDA definitions and tax rates aligned?
Financing sources = uses
Do the sources of funds exactly equal the uses of funds before any operating forecast is layered in?
Interest on new debt
Is interest calculated on the correct balance, with the right margin and any amortisation or sweep?
Synergy realism
Are revenue synergies phased and probability-adjusted, and are cost synergies capped by the target cost base?
Share count
Does the diluted share count include all new equity, convertibles and options on a combined basis?
PPA linkage
Do goodwill and intangible amortisation flow from the PPA into the income statement correctly?
Discuss an Engagement
If you require support with financial modelling, business valuation or financial due diligence for a live transaction or strategic engagement, we'd be pleased to discuss your requirements.