When you buy an online business, the non-compete clause is the document that stops the seller from reopening next door the day after you pay them. Without one, a seller can launch a near-identical site, email your customers, and rebuild the business you just bought, using everything they learned running it. A strong non-compete is not about punishing the seller; it is about protecting the value you paid for.

A good non-compete covers three things: what the seller cannot do, where they cannot do it, and for how long. The activity ban should cover operating, owning, or working for a competing business in the same niche, not just an exact copy of the site you bought. The geographic scope for an online business is usually worldwide, since the customers are. The duration is typically two to three years for a small online business, which is long enough for you to establish your own relationships with customers and suppliers.

The non-solicitation clause is often more important than the non-compete itself. It stops the seller from contacting your customers, suppliers, or employees after the sale. A seller who cannot open a competing site can still damage your business by emailing the customer list or poaching the freelance writer who produces your content. Make sure the agreement covers customers, suppliers, contractors, and employees, and that it lasts at least as long as the non-compete.

Courts will only enforce a non-compete that is reasonable, and what counts as reasonable varies by jurisdiction. A clause that bans the seller from all online work forever will almost certainly fail, while a focused ban on the same niche for two years usually stands. The safest approach is to keep the clause narrow and specific: name the niche, the competing activities, and a realistic time period, and get a lawyer in the relevant jurisdiction to review it. Some jurisdictions, including several US states, restrict or ban non-competes for employees, so the rules for a business sale are different from the rules for an employment contract.

Sellers sometimes resist a non-compete, especially when they want to stay in the same industry. If the seller pushes back, offer something in return: a higher price, a consulting fee for their help during the transition, or a narrower clause that only covers the exact niche rather than the whole industry. A seller who agrees to a paid consulting role during the handover is far less likely to compete with you, because they are invested in your success. If the seller refuses any non-compete at all, treat that as a serious red flag and consider reducing your offer or walking away.

Enforcement is only useful if the clause is written to be enforced. Include a clear remedy, such as the right to seek an injunction, and a clause that the seller pays your legal costs if they breach. Keep a copy of the signed agreement with the rest of the deal documents, and monitor the niche for a few months after closing. Most breaches are obvious: a new site in the same niche, a familiar brand name, or customers telling you the old owner contacted them. Act quickly if you spot one, because delay weakens your position.

A non-compete works best alongside two related documents: a non-disclosure agreement and an intellectual property assignment. The non-disclosure agreement stops the seller from sharing your customer list, supplier details, and financials after the sale, while the intellectual property assignment transfers the domain, trademarks, content, and code to you in writing. All three should be signed at closing, not after, because once the money has changed hands your leverage is gone. Keep the signed documents with the purchase agreement, and make sure the assignment lists every asset by name, including domains, social accounts, and software licences.