Cash vs. stock: how a deal is paid for
6 min read · updated July 2, 2026
Before an acquirer worries about strategy, it has to answer a plainer question: how do we pay for this? Cash, borrowed money, its own stock, or some mix. That choice isn't cosmetic. It changes the earnings per share math, it changes the risk the buyer takes on, and it tells the market what the buyer thinks its own shares are worth.
Three ways to fund a purchase. Each carries a different "cost" that eats into combined earnings.
| Consideration | What it costs the buyer | Rough size of that cost | |---|---|---| | Cash on hand | Forgone interest income | Low (a few percent) | | New debt | After-tax interest expense | Low to moderate | | New stock | A slice of every future dollar of earnings | High for most buyers |
This is the whole game. Understand why the three costs differ and the accretion/dilution answer falls out almost every time. Skip it, and you'll memorize a rule that breaks the moment the deal mix changes.
Cash and debt are usually cheap
Say a company sits on idle cash earning 4%. Use it to buy a business and you give up that 4% (less tax). That forgone interest is the only "cost" of paying cash. Now compare it to the earnings you're buying: if the target earns a 10% return relative to its price, you're swapping a 4% yield for a 10% one. EPS goes up. The deal is accretive.
Debt works the same way, just with borrowed money. If a buyer issues debt at 6% and the interest is tax-deductible, the after-tax cost of that debt at a 25% tax rate is only 4.5%. That deductibility is a real tax shield. Again you're funding an earnings stream that yields more than the financing costs, so EPS rises.
Cash and debt look accretive for the same reason: their after-tax cost is usually lower than the earnings yield of the company being bought. When financing is cheaper than what you're buying, combined EPS climbs. Stock is the expensive option because you hand over a permanent claim on every future dollar the combined company earns, not a fixed 4% or 6% coupon.
Stock deals live and die by relative P/E
When the buyer pays in shares, it prints new stock and gives it to the seller. There's no interest cost. The cost is dilution of the share count: more shares now split the same pool of earnings. Whether EPS ends up higher or lower comes down to one comparison, and it's the thing interviewers want you to say cold.
The intuition. A P/E is just price divided by earnings, so its inverse (the earnings yield) is what you get back per dollar spent. A high-P/E buyer is issuing "expensive" shares, meaning shares the market prices richly, to buy "cheaper" earnings. Each new share it hands over brings in more net income than that share dilutes away, so EPS rises.
A quick worked example
A buyer trades at a 20x P/E. Its target trades at a 10x P/E. The buyer earns $100 of net income on 100 shares, so EPS is $1.00 and the share price is $20. The target earns $50, and at 10x it's worth $500.
Paying $500 in stock at a $20 share price means issuing 25 new shares.
EPS went from $1.00 to $1.20. Accretive, exactly as the rule predicts, because 20x beats 10x. Now flip it: if the target traded at 40x instead of 10x, its $50 of earnings would cost $2,000, so the buyer would issue 100 new shares at $20 each. Pro-forma EPS falls to $150 / 200 = $0.75. Dilutive. Same companies, opposite answer, driven entirely by relative P/E.
Assuming stock deals are "always dilutive" because you're printing shares. Wrong. A stock deal is accretive whenever the buyer's P/E tops the target's, and high-multiple acquirers (think a richly valued tech company buying a slower, cheaper one) do accretive all-stock deals all the time. The deeper error is skipping the buyer-vs-target P/E comparison entirely and just eyeballing the new share count. The share count alone tells you nothing until you weigh it against the earnings those shares buy.
The signal a stock deal sends
There's a second reason the funding choice matters, and it has nothing to do with arithmetic. How you pay is a message.
A buyer that pays cash is saying: we think our own shares are worth at least what they trade for, so we'd rather part with cash than dilute you. A buyer that pays stock can be read the other way: management may believe its shares are richly priced (a nice currency to spend) and wants the seller to share the risk if the deal disappoints. Empirically, all-stock deals tend to draw a more skeptical reaction from the buyer's investors for exactly this reason.
That's also why the mix matters for who carries the risk. Pay cash and the buyer's shareholders keep 100% of the upside and the downside. Pay stock and the seller's holders become part-owners of the combined company, so they ride along on whatever happens next, good or bad.
Putting it together
A mixed deal (part cash, part debt, part stock) blends all three costs, and you'd weight each piece to get the combined answer. The P/E shortcut only cleanly applies to a 100% stock deal. For anything with cash or debt in it, you fall back to comparing each funding source's after-tax cost against the target's earnings yield. If you want the full pro-forma EPS build, see accretion / dilution. And remember from that lesson: accretive does not mean "good deal." It's an EPS test, not a verdict on value.
One more link worth making. The purchase price you're funding is an equity value figure for the target's shares, not enterprise value, so keep the two straight when you size the check. If that distinction is fuzzy, revisit enterprise value vs. equity value.
When you get "is this deal accretive or dilutive?", don't jump to numbers. Say the framework first, in one breath: "It depends how they pay. Cash or debt is usually accretive because the after-tax financing cost is below the target's earnings yield. For all-stock, I'd compare the buyer's P/E to the target's: higher buyer P/E means accretive." Leading with that structure, then walking one clean example, is the fluency that separates you in a Superday. Anyone can plug a calculator. Few can explain why the answer moves.
Glossary
New to the lingo? Every term used above, in plain English.
- Accretion
- A deal is accretive when it raises the buyer’s earnings per share (EPS).
- Dilution
- A deal is dilutive when it lowers the buyer’s earnings per share (EPS).
- EPS (Earnings Per Share)
- A company’s profit divided by its number of shares. It is the per-share slice of earnings that each shareholder owns.
- P/E ratio (Price to Earnings)
- A company share price divided by its earnings per share. It shows how many dollars investors pay for each dollar of profit, and lets you compare how expensive stocks are.
- Net income
- A company profit after all expenses, interest, and taxes are taken out. It is the bottom line of the income statement, also called earnings.
- Cost of debt
- The rate a company pays to borrow. Because interest is tax-deductible, the after-tax cost of debt is what goes into WACC, and it is cheaper than equity.
- Tax shield
- The tax a company saves because an expense is deductible. Depreciation, for example, lowers taxable income, so it saves cash on taxes even though it is non-cash.
- Equity Value
- The slice of a company that belongs to its shareholders. For a public company this is the market capitalization (share price times shares outstanding).
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