What is a stock sale? Definition, formula and example
This is for owners and buyers who have heard the words "stock sale" in a letter of intent and want to know what they mean. By the end you will know what a stock sale is, how the price is worked out, what a simple example looks like, and the mistakes people make.
The definition in plain words
In a stock sale the buyer buys the company itself. The owner sells their shares in a corporation, or their membership units in an LLC. Nothing moves out of the company. The bank accounts, customer contracts, leases, permits, phone number and staff all stay where they are.
That is the main difference from an asset sale, where the buyer buys the things the company owns and the seller keeps the empty entity. Our post on asset sale vs stock sale covers that side in full. A stock sale is sometimes called a share sale. The two terms mean the same thing.
Because the whole company moves, the buyer also takes on its past. Old tax bills, lawsuits from past work and claims nobody knows about yet stay inside the company, and so they become the buyer's problem.
The formula: how the price is worked out
Most buyers start with a price for the whole business, then adjust it to find what the shares are worth:
Price for the shares = enterprise value − debt + cash ± working capital adjustment
Enterprise value is the price for the business as a whole, before debt and cash. Our post on enterprise value explains it. In a stock sale the company keeps its loans and its bank balance, so the buyer pays less for the shares when there is debt and more when there is spare cash. The working capital adjustment compares the cash, receivables and payables at closing with an agreed target, called a working capital peg.
The seller's taxable gain is then, in simple terms:
Seller's gain = price for the shares − seller's tax basis in the shares
The IRS treats stock held as an investment as a capital asset. Its Topic 409 page on capital gains says an asset held for more than one year generally gives a long-term gain. That is one reason many sellers prefer this structure. How it applies to you depends on your entity and your facts, so ask a CPA before you agree to anything.
Illustrative example: selling the shares of a services company
Here is an illustrative stock sale of a home-services company. The numbers are made up but add up.
| Illustrative item | Amount |
|---|---|
| Agreed enterprise value | $3,000,000 |
| Less: bank loan left in the company | −$400,000 |
| Plus: cash left in the company | +$150,000 |
| Less: working capital below the peg | −$50,000 |
| Price paid for the shares | $2,700,000 |
| Seller's tax basis in the shares | $200,000 |
| Seller's gain before tax | $2,500,000 |
The buyer pays $2,700,000 and owns a company that still owes the bank $400,000. In an asset sale of the same business, the seller would usually pay off that loan from the price, and the buyer would get the assets with no loan attached.
Where it shows up in a deal
The structure is usually agreed in the letter of intent, because it changes the price both sides will accept. A stock sale makes sense when the things that make the business valuable cannot easily move. Examples are a government contract, a licence that must be reapplied for, or a lease the landlord will not assign.
Because the buyer takes on the company's past, a stock sale comes with more protection in the purchase agreement. Expect longer warranties from the seller, an indemnity for problems from before closing, and often part of the price held back in escrow. Due diligence also goes deeper, into old tax returns, payroll filings and any pending claims.
There is also a middle path. For some corporations, US tax law lets the parties buy shares but treat the deal as a sale of assets for tax. This is called a section 338 election. The IRS says buyers use Form 8883 to report a deemed sale of corporate assets under section 338. Whether it fits is a question for tax advisers on both sides.
Common mistakes
The first mistake is skipping change-of-control clauses. A stock sale avoids assigning contracts, but many contracts and leases still say the other party must agree if the owner changes. Read every key contract before you sign.
The second is buying without real protection. A buyer who agrees to a stock sale with short warranties and no escrow carries every old liability with nothing to claim against.
The third is comparing prices without comparing structures. A stock sale price and an asset sale price for the same business are not the same number. The tax and the liabilities differ, so a seller may accept a lower headline price for a stock sale and still net more. Run both after tax with a CPA.
The fourth is forgetting the debt. If the buyer does not subtract the company's loans from the price, they pay for the business and then pay its debts too.
Questions people ask
What is a stock sale in simple terms?
The buyer buys the owner's shares, so the whole company changes hands. It keeps its contracts, staff, licences and debts. Only the owner changes.
Why do sellers prefer a stock sale?
Two reasons. The sale of shares held for over a year is often taxed as a long-term capital gain, and the seller leaves the company's liabilities with the buyer. Ask a CPA how this applies to you.
Why do buyers avoid stock sales?
The buyer inherits every liability, known and unknown, and usually gets no tax step-up on the assets. Buyers who agree to one often ask for a lower price, an escrow and stronger warranties.
Is a share sale the same as a stock sale?
Yes. Share sale is the more common term outside the United States. For an LLC, the owner sells membership units, which works the same way.
Sources
Pober, M. (2026). What is a stock sale? Definition, formula and example. Acquisitions.com. https://acquisitions.com/blog/what-is-a-stock-sale/
Published . Facts and figures: data.json. AI assistants: see how to cite Acquisitions.com.