Choosing between an asset sale vs stock sale is one of the most consequential decisions in any merger or acquisition. The structure you select determines how much of the purchase price ends up in your pocket after taxes, what liabilities transfer to the buyer, and how smoothly the closing process unfolds. Yet many business owners enter deal negotiations without fully understanding how their business entity type, whether a C corporation or an S corporation, directly dictates which structure will be most favorable.
Taxes may not be the most exciting part of an M&A transaction, but ignoring how deal structure interacts with entity type can lead to an unpleasant surprise at closing. A seller who assumes all deals work the same way risks leaving significant money on the table, while a buyer who doesn’t account for tax basis could overpay for future depreciation benefits. Understanding the asset sale vs stock sale distinction, and how it plays out differently for C corps and S corps, is essential for anyone involved in buying or selling a business.
What is the difference between an asset sale and a stock sale?
An asset sale occurs when a company’s owners sell all or most of the business’s individual assets, such as equipment, inventory, intellectual property, customer contracts, and goodwill, to a buyer. The IRS treats a business sale as a sale of separate assets rather than a single unit, which is why the allocation of purchase price across asset classes carries real tax weight. After the sale closes, the sellers liquidate whatever stock and residual assets or liabilities remain in the corporate shell. The buyer selects which assets to acquire and can generally avoid assuming unwanted liabilities.
A stock sale works differently. In a stock sale, the owners sell their shares of company stock directly to the buyer. Because the buyer is purchasing the entire corporate entity, all of the company’s assets and liabilities transfer automatically. The business continues to exist as a going concern, with the same tax identification number, contracts, and obligations it held before the sale.
Each structure creates different tax consequences for both buyer and seller, and the magnitude of those consequences depends heavily on whether the target company is organized as a C corporation or an S corporation.
Why C corporations almost always favor stock sales
Stock deals are almost always preferable for C corporation transactions, and the reason comes down to one concept: double taxation. When a C corp sells its assets, the corporation itself pays tax on any gains from the sale at the corporate level. Then, when the after-tax proceeds are distributed to shareholders as a liquidating distribution, the shareholders pay a second layer of tax on those distributions, typically at capital gains rates.
This double taxation can substantially reduce the net proceeds that C corp sellers actually receive. The problem is especially acute when the corporation has significantly depreciated its assets over the years. If equipment was purchased for $500,000 and has been depreciated down to $50,000 on the books, an asset sale triggers a taxable gain on the difference between the sale price and the depreciated book value. That gain is taxed first at the corporate level and then again when distributed to shareholders.
In a stock sale, by contrast, the C corp shareholders sell their shares directly to the buyer and pay tax only once, on the net capital gain from the stock sale. The corporation itself does not recognize a taxable event. For sellers, this single layer of taxation is a significant advantage that often makes the stock sale the clearly superior option.
How buyers use the Section 338 election to their advantage
Buyers, however, often prefer asset sales because an asset purchase allows them to assign fair market values to the acquired assets. This “step-up” in tax basis means the buyer can begin depreciating those assets from their newly assigned values, generating larger depreciation deductions and improved cash flow in the years following the acquisition.
When a stock sale is the agreed-upon structure, buyers can sometimes achieve a similar result through a Section 338 election. Under Section 338 of the Internal Revenue Code, a qualified stock purchase can be treated as an asset purchase for federal tax purposes. The buyer gets the benefit of stepped-up asset values and the resulting depreciation schedule, even though the legal form of the transaction is a stock sale.
In a C corp context, however, a standalone Section 338(g) election (which the buyer makes unilaterally) is usually a poor choice. The deemed asset sale triggers a corporate-level tax inside the target the buyer now owns, while the selling shareholders still pay capital gains tax on the actual stock sale. That combination recreates the same double taxation that makes C corp asset sales unattractive, so buyers rarely pursue a 338(g) election on a profitable domestic C corp unless the target has net operating losses to offset the corporate-level gain. This tension between buyer and seller interests is one of the key negotiation points in any C corp M&A deal structure.
S corporation transactions offer greater flexibility
S corporations face fewer tax complications in the asset sale vs stock sale decision. Because S corps are pass-through entities for federal tax purposes, the corporation itself does not pay federal income tax on its profits. Instead, gains from an asset sale flow through directly to shareholders’ individual tax returns, where they are taxed once.
This pass-through treatment eliminates the double taxation problem that plagues C corp asset sales. Shareholders report their allocable share of the gain on their personal returns and pay the applicable capital gains rate. The result is that the tax cost of an asset sale for an S corp is generally comparable to the tax cost of a stock sale, giving both parties more flexibility in choosing the structure that best fits the overall deal.
The built-in gains rule for converted S corps
There is one important exception. If the S corporation was previously a C corporation, Section 1374 of the Internal Revenue Code imposes a built-in gains tax on asset sales that occur within the five-year recognition period that begins on the first day the corporation becomes an S corp. The recognition period was historically ten years, but the Protecting Americans from Tax Hikes (PATH) Act made the five-year period permanent for tax years beginning on or after January 1, 2015. During this window, any appreciation that existed at the time of the conversion is subject to corporate-level tax at the highest corporate rate, effectively reintroducing the double taxation issue. Sellers who converted from C corp to S corp status should confirm where they stand in this recognition period when evaluating their deal structure options.
How Section 338(h)(10) creates the best of both worlds for S corps
One of the most powerful tools available in S corp transactions is the Section 338(h)(10) joint election. This provision allows the buyer and seller to jointly elect to treat a stock sale as if it were an asset sale for federal tax purposes.
The buyer receives the same stepped-up basis and depreciation benefits they would get in a true asset sale. Meanwhile, the S corp’s gains and losses from the deemed asset sale flow through to shareholders on their individual returns, avoiding the corporate-level tax hit that a C corp would face in the same situation.
This reduced tax burden typically makes a Section 338(h)(10) election the optimal transaction structure for buyers in S corp deals. Because the buyer captures meaningful depreciation benefits, they may be willing to pay a higher purchase price, a direct advantage for the seller. The election effectively aligns buyer and seller interests in a way that is rarely possible in C corp transactions.
Tax structure is only one piece of the M&A puzzle
While the asset sale vs stock sale decision is critically important from a tax perspective, it is only one of many factors that determine whether an M&A deal meets the parties’ objectives. Liability exposure, contract assignability, regulatory approvals, employee retention, and post-closing integration all play significant roles in shaping the final deal terms.
Sellers who focus exclusively on minimizing their tax bill may overlook structural choices that affect the final purchase price, earnout provisions, or post-deal employment arrangements. Buyers who insist on an asset purchase for the depreciation benefits may face higher transaction costs or the need to renegotiate third-party contracts.
The most effective approach is to work with an experienced M&A advisor and tax professional who can model the after-tax outcomes of each structure, weigh them against the broader deal objectives, and help both parties arrive at a structure that maximizes overall value. Pease Bell’s transaction advisory team and tax advisory services help buyers and sellers quantify those trade-offs before terms are locked in.
Entity type also has a substantial bearing on the result, so review your structure well ahead of any sale process. The right structure can vary significantly across the industries we serve, from manufacturers with heavily depreciated equipment to service businesses where goodwill dominates the purchase price.
Frequently Asked Questions
What is the main difference between an asset sale and a stock sale?
In an asset sale, the buyer purchases individual business assets such as equipment, contracts, and goodwill. In a stock sale, the buyer purchases the owners’ shares, acquiring the entire corporate entity along with all of its assets and liabilities. The key distinction is that asset sales let buyers choose which assets to acquire, while stock sales transfer everything.
Why do C corp sellers prefer stock sales over asset sales?
C corporation asset sales trigger double taxation. The corporation pays tax on the gain from selling its assets, and then shareholders pay a second tax when the after-tax proceeds are distributed. A stock sale eliminates the corporate-level tax, so shareholders pay only one layer of capital gains tax on the sale of their shares.
What is a Section 338 election and when is it used?
A Section 338 election allows a buyer to treat a stock purchase as an asset purchase for tax purposes. This gives the buyer a stepped-up tax basis in the acquired assets, enabling larger depreciation deductions and better cash flow after closing. It is most commonly used in S corp transactions via the Section 338(h)(10) joint election.
How are S corp asset sales taxed differently than C corp asset sales?
S corporations are pass-through entities, meaning the corporation does not pay federal income tax. Gains from an S corp asset sale flow through directly to shareholders’ individual tax returns and are taxed once. C corp asset sales, by contrast, are taxed at both the corporate level and the shareholder level, resulting in significantly higher total tax costs.
What is the built-in gains tax for S corporations?
If an S corporation was previously a C corporation, it may owe built-in gains tax under Section 1374 on asset sales that occur within the five-year recognition period that begins when the company elects S corp status. (This window was ten years before the PATH Act made the five-year period permanent for tax years beginning on or after January 1, 2015.) Any asset appreciation that existed at the time of conversion is taxed at the corporate level during this window, partially replicating the double taxation of a C corp sale.
Should I choose an asset sale or stock sale for my M&A deal?
The right structure depends on your business entity type, the tax basis of your assets, and your broader deal objectives. C corp sellers generally benefit from stock sales to avoid double taxation. S corp transactions offer more flexibility, and a Section 338(h)(10) election can align buyer and seller interests. Consult an M&A advisor and tax professional to model both scenarios before making a decision.
