M&A

Asset deals versus stock deals

6 min read · updated July 8, 2026

There are only two legal ways to buy a company, and the choice between them decides who inherits the risks and who gets a tax break. One buyer pays the same price for the same business and walks away with a very different deal depending on which structure they pick. So even though this sounds like lawyer trivia, it is a favorite interview topic, and the logic is simple once you see it.

The two structures are a stock deal and an asset deal. In a stock deal you buy the target's shares. In an asset deal you buy the target's assets directly and leave the shares behind. That one difference drives everything else.

Stock deal: you buy the whole entity

When you buy the stock, you buy the legal entity itself, exactly as it stands. Every asset comes with it, and so does every liability. Not just the debt you can see on the balance sheet, but the ones you cannot: a lawsuit that has not been filed yet, an unpaid tax bill from three years ago, an environmental cleanup nobody disclosed. These hidden or uncertain obligations are called contingent liabilities, and in a stock deal they are now your problem.

There is also a tax consequence. In a stock deal the tax basis of the target's assets usually carries over unchanged. Tax basis is the value the tax authorities let you depreciate an asset down from. If the target had been depreciating a factory for years, you inherit that same low, worn-down basis. You get no fresh tax deductions from the deal. This matters more than it sounds, and the next section shows why.

Asset deal: you pick what you buy, and you get a step-up

In an asset deal you buy specific assets and assume only the liabilities you agree to take. You can leave the messy contingent liabilities with the seller. That alone is a big reason buyers like this structure.

The bigger prize is the tax treatment. In an asset deal you get a step-up: the tax basis of the assets you bought is reset up to their current fair value, the price you actually paid. Now you get to depreciate and amortize those assets from a higher starting number.

Key insight

A step-up is real cash in the buyer's pocket. Higher asset basis means more amortization and depreciation expense in future years. That expense is tax-deductible, so it lowers the taxable income the buyer reports and shrinks the cash taxes they actually pay. The asset did not change. The tax deductions did, and those deductions are worth money.

Here is a clean example. You buy a piece of equipment for $100 in an asset deal. Its old tax basis was $40. You step it up to $100 and depreciate the full $100 over its life instead of the leftover $40. That extra $60 of deductions, at a 25% tax rate, saves you $15 of cash taxes spread over the years ahead.

How the step-up ties to goodwill

The step-up connects straight to purchase accounting. When you buy a business, you spread the price across everything you got. First you write the identifiable assets up to fair value. Anything you paid above the fair value of those net assets becomes goodwill. In an asset deal, that goodwill is often tax-deductible too, amortized over 15 years for tax purposes, which is another slice of the same shield. In a plain stock deal, it usually is not deductible at all.

Who prefers what, and why

Buyers generally prefer asset deals. They get the step-up, and they leave the hidden liabilities behind. Two wins in one structure.

Sellers often prefer stock deals, for two reasons. First, a stock sale is cleaner: the whole entity walks out the door, contracts and licenses intact, nothing to untangle asset by asset. Second, and this is the big one, an asset sale can trigger double taxation for a C-corp seller. The company pays tax when it sells the assets at a gain, and then the owners pay tax again when the after-tax cash is distributed to them. The same profit gets taxed twice.

Common mistake

Assuming both sides can just agree on whichever structure is "better." They usually cannot, because the buyer's step-up gain is the seller's tax bill. The buyer wants the asset deal for the deductions; the C-corp seller resists it to dodge double taxation. This tension is exactly why the price and the structure get negotiated together, never separately.

The 338(h)(10) election: buy stock, treat it as assets

There is a bridge between the two. A 338(h)(10) election lets the buyer legally purchase the stock but elect to treat the deal as an asset purchase for tax purposes. The buyer gets the step-up as if it had bought the assets, while still acquiring the shares and keeping the entity clean.

It is not available on every deal. It requires an eligible seller, typically an S-corp or a corporate subsidiary being sold by its parent. For those sellers, an asset-style tax result does not create the same double-taxation hit, so both sides can agree to it. When you can use it, you get the best of both worlds: shares change hands, and the buyer still collects the tax shield.

Interview tip

If asked "asset deal or stock deal, and who prefers which," lead with the trade, not a list. Say it in one breath: "Buyers like asset deals for the step-up in tax basis and to avoid unknown liabilities. Sellers like stock deals because they are cleaner and an asset sale can double-tax a C-corp." Then, if they push, name the bridge: "A 338(h)(10) election lets you buy stock but treat it as an asset deal for tax, so the buyer still gets the step-up, but only with an eligible seller like an S-corp." Naming that election unprompted is what signals you actually understand deal structure.

Glossary

New to the lingo? Every term used above, in plain English.

Stock deal (equity purchase): A structure where the buyer purchases the target’s shares and takes over the entire legal entity, inheriting all of its assets and liabilities, including unknown ones.
Asset deal: A structure where the buyer purchases specific assets of a company and assumes only the liabilities it chooses, leaving the target’s shares and unwanted obligations behind.
Tax basis: The value the tax authorities let you depreciate or amortize an asset down from. A higher basis means larger future tax deductions.
Step-up (in basis): Resetting the tax basis of acquired assets up to the price paid (fair value), which creates extra future depreciation and amortization that lowers the buyer’s cash taxes.
Contingent liability: A potential obligation that is uncertain or not yet visible, such as an unfiled lawsuit or a future cleanup cost. In a stock deal the buyer inherits these along with the entity.
Double taxation: When the same profit is taxed twice: once at the company level and again when the after-tax cash is distributed to the owners. A classic issue for C-corp sellers in an asset sale.
C-corporation (C-corp): A company taxed as its own separate entity. Its profits are taxed at the company level, and again when paid out to shareholders, which is where double taxation comes from.
S-corporation (S-corp): A company whose profits are passed through and taxed only once, at the owners’ level, instead of at the company level. Its status can make a 338(h)(10) election possible.
338(h)(10) election: A tax election that lets a buyer legally purchase a target’s stock but treat the deal as an asset purchase for tax, so the buyer gets a step-up. It requires an eligible seller such as an S-corp or a corporate subsidiary.
Goodwill: An accounting plug created when a buyer pays more for a company than the fair value of its identifiable net assets. It captures things like brand and customer relationships.
Amortization: Spreading the cost of an intangible asset (like a patent or software) over its useful life. It is the intangible-asset version of depreciation, and it is also non-cash.
Purchase accounting: The rules for recording an acquisition: the target assets are marked to fair value, any extra paid becomes goodwill, and write-ups can create a deferred tax liability.
Fair value: What an asset is actually worth today in an arm’s-length transaction, rather than the older book value carried on the accounts. Acquired assets are marked to fair value in a deal.

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