What Is a Buy-Sell Agreement and Why Do Co-Owners Need One?
Sam's List Editorial | 2026-07-31
What Is a Buy-Sell Agreement and Why Do Co-Owners Need One? A buy-sell agreement is a binding contract among the owners of a business, and often the business itself, that governs what happens to an ownership interest when a defined event occurs. It sets who may buy, who must sell, how the price is determined, and how the purchase gets paid for. It is sometimes called a business prenup, which understates it. Here is the reason it matters. Without one, your next co-owner is chosen by someone else: a probate court dividing an estate, a divorce court dividing marital property, a bankruptcy trustee liquidating an interest, or a departing partner who sells to whoever will pay. You will still have a business partner. You just will not have picked them. The Triggering Events a Real Buy-Sell Agreement Covers Most agreements cover death. Fewer cover the events that actually happen more often. A complete agreement addresses death, long-term disability, voluntary retirement, voluntary departure to do something else, involuntary termination including for cause, divorce, personal bankruptcy or a creditor attaching an interest, loss of a required professional license, and a deadlock among owners who cannot agree. Divorce and disability deserve specific attention. Divorce can place a business interest in front of a family court, and an agreement that restricts transfers and gives the other owners a purchase right is what usually keeps an ex-spouse from becoming a shareholder. Disability is harder, because it requires defining disability, choosing who determines it, and setting a waiting period. Agreements that skip the definition tend to fail exactly when someone is too sick to negotiate. Deadlock is the one nobody wants to write. Two 50 percent owners who cannot agree have no mechanism to break the tie unless the document provides one, and there are established options: a buyout right at a formula price, a forced-sale provision where one owner names a price and the other chooses whether to buy or sell at it, or binding third-party resolution. How the Price Gets Set, and Where Buy-Sell Agreements Fail Valuation is where most buy-sell agreements break, and it usually breaks in one of three ways. A fixed price that goes stale. Owners agree on a number, write it in, and never revisit it. Ten years later the business is worth three times that figure and the agreement is a windfall for whichever side happens to be buying. A formula that stops describing the business. A multiple of trailing revenue or earnings is simple and can work well for years, then stops working when...
