What Is a Buy-Sell Agreement? A Plain-English Guide

A buy-sell agreement is a binding contract among the co-owners of a business that controls what happens to an owner's share when a triggering event occurs, such as death, disability, divorce, or departure. It sets who may buy the share, at what price or valuation method, and how the purchase gets funded. Some people call it a business prenup.

Last updated July 2026. This is general information, not legal or tax advice. Talk to a business attorney and a CPA before you sign anything.

What is a buy-sell agreement?

A buy-sell agreement is a private contract signed by all owners of a company that decides, in advance, what happens to each owner's stake when they exit for any reason. It answers three questions: who can buy the departing share, what price applies, and where the money comes from. It is sometimes called a buyout agreement.

Think of it as the exit plan you write while everyone still gets along. Without one, a co-owner's death or messy divorce can drop a new and unwanted partner into your business, or force a fire-sale of the whole company. The agreement removes that guesswork. When the day comes, the terms are already settled and every owner has agreed to them in writing.

How does a buy-sell agreement work?

The agreement sits dormant until a listed event happens. At that point it turns on automatically: it names who has the right or obligation to buy the affected share, applies the agreed valuation method to set a price, and points to the funding source that pays for the buyout. Owners follow the steps they already agreed to.

In practice the mechanics look like this. An owner dies, and the agreement gives the surviving owners (or the company itself) the right to purchase that owner's interest from the estate. The price is calculated using the method written into the contract. A funding source, often a life insurance policy, provides the cash. The estate gets paid a fair amount, and the business stays in the hands of the remaining owners. You can sign a buy-sell agreement online so every owner executes the same version without chasing paper.

What are the types of buy-sell agreements?

There are three main structures. In a cross-purchase, the remaining owners buy the departing owner's share directly. In an entity-purchase (also called a redemption), the business itself buys the share back. A hybrid, or wait-and-see, agreement lets the parties decide at the time of the event which route makes more sense.

Partners often pair this with their partnership agreement, and many single-entity businesses fold buy-sell terms straight into their LLC operating agreement rather than keeping a standalone document.

What triggers a buy-sell agreement?

A triggering event is the specific circumstance that activates the buyout rights. The classic four are death, disability, divorce, and departure, but most agreements list more. Each trigger describes what happens: who gets the option or obligation to buy, and on what timeline the sale must close.

How is the price set in a buy-sell agreement?

Price is set by the valuation method written into the contract, chosen before anyone knows who will exit first. The three common approaches are a fixed price the owners agree on, a formula tied to earnings or book value, or an independent appraisal performed at the time of the event. Each has a place.

The fixed-price route is the simplest to understand and the easiest to get wrong. A number that felt fair the year you signed can be badly stale a decade later, after the business has grown or shrunk. If you use a fixed price, commit in the agreement to updating it on a schedule, for example once a year. A formula avoids that drift by recalculating from current financials. An appraisal at the time of the event tends to be the most accurate and the most defensible, though it costs money and takes time. Many owners use a formula as the default and an appraisal as a fallback if a party disputes the result.

How is a buy-sell agreement funded?

Funding is how the buyer actually pays for the share. The most common method is insurance: a life insurance policy covers the death trigger and a disability policy covers the disability trigger, so cash is available exactly when the event happens. Other options include installment payments over time or a sinking fund the business builds up in advance.

Insurance is popular because it converts an unpredictable event into a predictable payout, and it means the surviving owners are not scrambling to find money during a crisis. Whichever policies you rely on, review the coverage as the business value changes, and treat keeping every business insurance document current as part of the same maintenance habit as updating the agreement itself. Installment sales spread the cost over months or years, which eases cash flow but leaves the seller carrying some risk until the last payment clears. A sinking fund works when you have years of warning, such as a planned retirement, but does little for a sudden death. Plenty of agreements combine methods: insurance for the sudden triggers and installments for the planned ones.

Who needs a buy-sell agreement?

Any business with more than one owner needs a buy-sell agreement. That includes multi-member LLCs, partnerships, closely held corporations, and family businesses. If two or more people share ownership and there is no public market for the shares, you are exactly the audience this contract protects.

Single-owner businesses generally do not need one, since there are no co-owners to buy anyone out. But the moment you take on a partner, bring a child into a family company, or issue shares to a key employee, the calculus changes. The agreement is cheapest and easiest to negotiate while relationships are healthy and no one has an emergency. Waiting until a partner is sick, divorcing, or already gone is how these conversations turn into lawsuits.

Is a buy-sell agreement filed with the state?

No. A buy-sell agreement is a private contract among the owners. It is signed by all of them and kept with the company's records, but it is not filed with the state the way your articles of organization or incorporation are. That privacy is part of the point: the terms stay between the owners.

Because it is a private contract, its strength comes from careful drafting and clean execution. Every current owner should sign the same final version, and you should re-sign or amend it whenever ownership changes. A business attorney should draft or review the terms, and a CPA should weigh in on valuation and tax treatment, since the structure you pick affects both. When the document is ready, you can sign a buy-sell agreement online and store the executed copy alongside your other governing records.

This guide is general information and not legal or tax advice. Consult a qualified business attorney and CPA about your specific situation.