Asset sale vs. stock sale: the deal structure decision that changes what you keep

A founder who built a $22 million regional distribution business over 19 years had a buyer, a signed LOI, and a number she was genuinely excited about. Three weeks into due diligence, her attorney flagged something she had glossed over: the deal was structured as an asset purchase.

She had assumed it was a stock deal. The buyer had not corrected her.

Why the structure gap cost $1.9 million

In a stock sale, a C-corp seller faces one layer of tax. The gain passes through at the shareholder level, taxed at long-term capital gains rates. In an asset sale, the C-corp pays corporate tax on the asset gains first, then the seller pays tax again on the distribution out of the corporation. The effective double-tax cost in her situation came to just under $1.9 million.

The buyer knew this. They had structured the LOI as an asset deal specifically because it gave them a stepped-up basis in the assets, which was worth real money to them in future depreciation. They had priced the difference in. She had not.

Her attorney tried to renegotiate. The buyer came up $400,000 on the purchase price and called it even. They were still ahead by over a million dollars.

Why buyers and sellers want opposite things

This is not an unusual story. Buyers and sellers have opposite preferences on deal structure for exactly the reason this story illustrates.

The buyer wants an asset sale. Buying assets gives them a fresh tax basis equal to the price paid. They can write off goodwill, customer relationships, and equipment through depreciation and amortization over future years. An asset deal also lets them choose which liabilities to assume and which to leave behind, which matters when there may be unknown historical exposure.

The seller wants a stock sale. Selling equity produces a single layer of capital gains tax. No asset retitling, no contract reassignments, no licensing re-issuance. The buyer steps into the owner's shoes with the corporate entity intact.

S-corps and LLCs have different dynamics

The double-tax problem is specific to C-corporations. S-corp and LLC sellers face a different version of the structure decision, with different trade-offs.

For S-corp sellers, there is a tax election (Section 338(h)(10)) that lets buyer and seller have a stock deal legally but an asset deal for tax purposes. The buyer gets the depreciation step-up they want. The seller gets capital-gains treatment because the gain passes through at the shareholder level. The seller typically agrees to the election in exchange for a gross-up on the purchase price. If the math is modeled properly, both sides can benefit relative to a straight asset deal.

For LLC sellers taxed as partnerships, the Section 754 election provides a partial step-up in the partnership's asset basis for the buyer's share, accomplishing a similar economic result. Owners of partnership interests should confirm whether a 754 election is in place well before going to market.

What should have happened before the LOI

Before she ever signed the LOI, her CPA and her M&A advisor should have modeled both deal structures side by side. The $1.9 million difference would have been visible before she had any psychological commitment to the deal. That is an easy conversation to have before you're in it.

For C-corp owners, that conversation should also include a look at whether the company qualifies for Section 1202 Qualified Small Business Stock treatment. The 2025 tax law expanded this exclusion meaningfully, and for some C-corp sellers it can reduce or eliminate federal tax on a portion of the gain entirely.

Deal structure is not a legal formality. It is tax strategy. The two should not be separated, and neither should be left for week three of diligence.