In a typical first-round banking or M&A technical desk, accretion is the question that ends the conversation for half the room. Not because the arithmetic is hard, but because candidates treat a higher pro forma EPS as proof the deal is good. It is not. Accretion is a financing and share-count artifact. Economic value is whether after-tax synergies clear the premium you paid. That distinction is what the scoring sheet rewards.
This piece is for consulting candidates cross-applying to banking, or for anyone who meets merger math inside an M&A case. Strategy framing lives in the sibling guide on M&A case structure. Here we stay on the technical questions: accretion/dilution, purchase price allocation and goodwill, synergies versus premium, and cash versus stock consideration. After you finish, you should be able to walk a whiteboard through each of those with original numbers and still sound like you have read a real 8-K.
What the interviewer is listening for
I stop listening when a candidate says "the deal is accretive, so I would do it." That sentence collapses three different tests into one. The interviewer wants to hear that you can:
- Build pro forma EPS from buyer NI, target NI, financing cost, and share count.
- Separate identifiable intangibles from residual goodwill under acquisition accounting.
- Compare the premium paid to the present value of synergies, not to the EPS outcome.
- Explain why an all-cash deal and an all-stock deal with the same headline price produce different EPS answers.
Public filings make the same separations. Capital One's Discover merger was structured as an all-stock deal at a fixed 1.0192 exchange ratio. Microsoft's Activision Blizzard close was an all-cash purchase that later showed $75.4 billion of consideration with most of the residual booked as goodwill. Different consideration mix, same accounting logic.
Accretion and dilution, with numbers you can reproduce
A deal is accretive when pro forma EPS exceeds the buyer's standalone EPS, and dilutive when it falls short. Nothing more. Interviewers usually give you a cash-and-debt case first, then flip you into stock to watch the share count bite.
Invented example. Harbor Logistics (buyer) acquires Northwind Freight (target). Tax rate 25%. Harbor has 100 million shares and $400 million of net income ($4.00 EPS). Northwind contributes $80 million of net income. Harbor pays $1,000 million for Northwind's equity.
| Financing | Cost assumption | After-tax annual cost | New shares | Pro forma NI | Pro forma shares | Pro forma EPS | vs $4.00 |
|---|---|---|---|---|---|---|---|
| All cash | Forgone interest 4% | $30m | 0 | $450m | 100m | $4.50 | Accretive |
| All debt | Interest 6% | $45m | 0 | $435m | 100m | $4.35 | Accretive |
| All stock | Harbor issues at $50 | $0 explicit | 20m | $480m | 120m | $4.00 | Flat |
Cash case: combined NI starts at $480m; you lose $1,000m × 4% × (1 − 0.25) = $30m of after-tax interest income, so $450m / 100m = $4.50. Debt case: $1,000m × 6% × 0.75 = $45m after-tax interest, so $435m / 100m = $4.35. Stock case: no cash interest hit, but 20 million new shares, so $480m / 120m = $4.00 exactly.
The all-stock shortcut interviewers like: compare seller earnings yield to buyer earnings yield. Harbor trades at $50 / $4.00 = 12.5x, so equity "cost" is 1 / 12.5 = 8%. If you bought Northwind for $1,000m against $80m of NI, purchase P/E is 12.5x and seller yield is also 8%. Flat accretion matches the full build. Raise the purchase P/E and the stock deal goes dilutive before cash or debt would.
Cash versus stock: same price, different EPS
Consideration mix is not a preference question. It changes the math and the ownership story.
| Source | What hits the income statement | What hits the share count | Typical accretion bias |
|---|---|---|---|
| Cash on hand | Forgone after-tax interest | Unchanged | Often accretive if cash earns little |
| New debt | After-tax interest expense | Unchanged | Usually accretive at investment-grade coupons |
| New stock | No explicit interest | Dilutes denominator | More often dilutive when buyer P/E is low vs purchase P/E |
Real deals pick a mix for reasons the model cannot invent. Discover stockholders received Capital One stock at a fixed 1.0192 ratio, so the dollar value of the consideration floated with Capital One's share price into close. Activision Blizzard stockholders received $95.00 per share in cash, so Microsoft's share count did not absorb the deal. In an interview, say both facts aloud: cash preserves the denominator and costs forgone interest; stock preserves the balance sheet cash and dilutes EPS unless the seller's yield beats the buyer's.
Purchase price allocation and goodwill
Under U.S. GAAP business-combination rules (ASC 805), the acquirer measures identifiable assets and liabilities at acquisition-date fair value. Goodwill is the residual: consideration transferred minus fair value of identifiable net assets. It is not a "synergy line item" you pick; it is whatever is left after you have written up inventory, PP&E, customer contracts, brands, and other identifiable intangibles.
Microsoft's completed Activision Blizzard allocation is a clean public template. On October 13, 2023, Microsoft closed for a total purchase price of $75.4 billion, consisting primarily of cash. The allocation (in millions) included cash $12,976, intangible assets $21,969, goodwill $51,001, and various liabilities netted against that total. Microsoft attributed the goodwill primarily to expected integration synergies; substantially all of it was expected to be non-deductible for tax. Identifiable intangibles were split into marketing-related ($11.6 billion, 24-year life), technology-based ($9.7 billion, 4-year life), and customer-related ($0.7 billion, 4-year life). Those finite-lived intangibles amortize. The goodwill does not.
Capital One's Discover pro forma exhibit shows the same residual logic on a stock deal: preliminary purchase consideration of about $51.6 billion, fair value of net assets acquired about $31.8 billion, and preliminary goodwill about $19.9 billion. The filing cites ASC 805 by name and states that excess consideration over fair value of assets acquired and liabilities assumed is recognized as goodwill.
For public companies, FASB guidance is that goodwill is not amortized; it is tested for impairment at least annually (private companies may elect a different alternative). In an interview, the line that earns the point is: "Write assets up, book identifiable intangibles, residual is goodwill, goodwill sits until impaired." Candidates who say "goodwill amortizes over 40 years" are answering a rule that U.S. public GAAP left behind.
Synergies versus the premium
This is where consulting training helps more than banking flashcards. Premium is what you pay above standalone value. Synergies are the incremental cash flows the combination creates. A deal can be EPS-accretive and still destroy value if the premium exceeds the after-tax PV of synergies. It can also be mildly dilutive in year one and still create value if cost takeout is delayed but durable.
Work the Harbor numbers again. Suppose Northwind's standalone equity value is $800 million and Harbor pays $1,000 million. Premium = $200 million. Harbor expects $40 million of pre-tax annual cost synergies (duplicate terminals, overlapping back office) that start in year two and last indefinitely, taxed at 25%, discounted at 10%. After-tax synergy annuity = $30 million; PV at 10% = $300 million. Premium $200 million, synergy PV $300 million: economic surplus exists even before you talk about EPS. Flip the synergy estimate to $20 million pre-tax and the surplus disappears while the cash deal above still looked accretive.
Public filings often refuse to put synergy run-rates into the Article 11 pro formas. Capital One's Discover exhibit explicitly says the unaudited pro forma information does not reflect anticipated synergies or cost savings. That is a useful interview sentence: pro forma EPS in an 8-K is a mechanical combination, not management's synergy case.
Ned's rule. Treat accretion as a consistency check on financing, not as a go/no-go. If you cannot show that after-tax synergy value covers the control premium, the EPS answer is entertainment.
How I would answer the four core questions out loud
Accretion/dilution. "Pro forma NI over pro forma shares versus buyer standalone EPS. Cash and debt cut NI through after-tax interest; stock cuts EPS through the share count. I would show both the full build and the all-stock yield shortcut."
PPA and goodwill. "ASC 805: fair-value the identifiable net assets, residual is goodwill. Finite-lived intangibles amortize; public-company goodwill usually does not. Microsoft's Activision close is the poster example: most of a $75 billion cash purchase became goodwill after writing up brands and technology."
Synergies versus premium. "Premium is price above standalone. Synergies are incremental cash flows. I compare PV of after-tax synergies to the premium. Accretion can disagree with that test."
Stock versus cash. "Cash hits interest income or debt interest and leaves share count alone. Stock issues new shares and can float the dollar value of consideration with the buyer's stock price, as in Capital One–Discover's fixed exchange ratio."
Practice this on a timer
Open the free quick math drill and time yourself on a 90-second accretion build: buyer NI, target NI, tax rate, cash/debt/stock mix, share count. Then walk the same deal through a Harbor-style premium-versus-synergy check on paper. If you want a full case that forces synthesis after the math, run the five-minute first rep at /start (no account) or the live voice interview at /interview. Everything on CoachNed is open for seven days with no card; then $120 for a recruiting season or $49 a month.
Frequently asked questions
What is accretion in a merger model interview?
Accretion means pro forma EPS is higher than the acquirer's standalone EPS after combining earnings, financing costs, and new shares. Dilution is the opposite. It is an accounting and financing result, not a judgment that the deal creates economic value.
How do you calculate goodwill in an acquisition?
Goodwill equals consideration transferred (plus any noncontrolling interest and previously held equity interest, if relevant) minus the fair value of identifiable net assets acquired. You do not "choose" a goodwill percentage; it is the residual after purchase price allocation under ASC 805.
Why are stock deals often more dilutive than cash deals?
Stock deals increase the share count, which lowers EPS unless the target's earnings yield exceeds the cost of the new equity. Cash and debt usually cost only after-tax interest, which is often a few percentage points, so they dilute less on EPS even when the headline purchase price is identical.
Is an accretive deal always a good deal?
No. A deal can raise EPS while still overpaying relative to the present value of synergies, especially if cheap cash or leverage masks a rich premium. Interviewers want that separation stated clearly.
Where do real merger proxies show purchase accounting?
Look for the joint proxy or Form 8-K Item 9.01 pro forma exhibits. Capital One's Discover merger 8-K and subsequent EX-99.3 pro formas, and Microsoft's Activision Blizzard business-combination note, are workable public examples of exchange ratios, cash consideration, and goodwill allocation.
Sources
- Capital One–Discover Form 8-K (Feb. 20, 2024) — all-stock exchange ratio of 1.0192 Capital One shares per Discover share. Checked 2026-09-24.
- Activision Blizzard DEFA14A (Jan. 18, 2022) — $95 per share all-cash transaction and ~45% premium to the Jan. 14, 2022 share price. Checked 2026-09-24.
- Microsoft Form 10-Q note, Business Combinations (Activision Blizzard) — $75.4 billion purchase price, $51.0 billion goodwill, $22.0 billion identifiable intangibles. Checked 2026-09-24.
- Capital One EX-99.3 unaudited pro forma (Discover) — ASC 805 acquisition method, preliminary $51.6 billion consideration, ~$19.9 billion goodwill; pro formas exclude synergies. Checked 2026-09-24.
- FASB ASU 2019-06 (Topic 350) — for entities not electing the private-company alternative, goodwill is not amortized and is tested for impairment at least annually. Checked 2026-09-24.
- Deloitte ASC 805 roadmap: measuring goodwill — goodwill measured as residual under ASC 805-30-30-1. Checked 2026-09-24.
CoachNed is not affiliated with McKinsey, BCG, Bain, Deloitte, or any bank or firm named above.