When you buy a small online business, you can buy its assets or buy the company that owns them, and the choice changes everything about what you inherit. In an asset purchase, you buy the website, the domain, the customer list, the code, and the brand — and you leave the old company's debts, lawsuits, and tax problems behind. In a stock purchase, you buy the shares of the company itself, which means you inherit everything: the assets, the contracts, the liabilities, and the history. For small online deals, the asset purchase is the default for a reason.

Buyers prefer asset purchases because they control the risk. You pick exactly which assets transfer and which liabilities stay with the seller. Old tax disputes, a pending chargeback claim, or a contractor the seller never paid — none of that follows you. You also get a tax advantage: the purchase price can be allocated across the assets, and items like the customer list or software can often be amortised, which reduces your future tax bill. The downside is paperwork. Every contract, every subscription, and every payment account has to be re-signed or re-created in your name, and some contracts cannot transfer at all.

Sellers usually prefer stock purchases, and the reason is simple: a clean exit. They sell the company, walk away, and keep the structure intact — contracts, payment accounts, and licences all stay in place. Stock sales can also be more tax-efficient for the seller in some jurisdictions, which is why they push for them. But for the buyer, a stock purchase means inheriting every liability the company ever created, including ones that have not surfaced yet. That is why stock deals come with warranties, indemnities, and often a holdback of part of the price.

Whichever structure you choose, three things matter. First, intellectual property: confirm the seller actually owns the code, the content, and the brand, and that no freelancer or contractor holds a claim. Second, contracts: check whether key agreements — hosting, software licences, affiliate deals — allow assignment to a new owner. Third, tax: the structure changes how both sides are taxed, so get advice from an accountant who knows online-business deals before you sign a letter of intent.

For most small online businesses, the asset purchase is the safer choice for the buyer and the standard the marketplaces expect. Accept a stock purchase only when there is a clear reason — a licence that cannot transfer, a contract that would be lost, or a tax benefit that outweighs the inherited risk — and price that risk into the deal with warranties and a holdback. The structure is not a detail; it is the deal.

Whichever structure you choose, the purchase agreement does the real work, and four clauses matter most. Representations and warranties are the seller's promises about the business — that they own the IP, that the financials are accurate, that there are no undisclosed liabilities — and they are your remedy if a promise turns out false. Indemnities set who pays when something goes wrong after closing, and for how long. Escrow or holdback provisions keep part of the price with a neutral third party for 30 to 90 days, giving you leverage if a warranty is breached. And the transition services clause commits the seller to help you take over — typically 30 to 90 days of support, with the hours and scope in writing. Get a lawyer who has done online-business deals to draft or review the agreement, because a generic template will miss the IP assignment, the data transfer, and the non-compete that actually protect you.