What Is a Buy-Sell Agreement and Does Your Small Business Need One?

By Bill Stilwell · Last reviewed October 16, 2026

The short answer

A buy-sell agreement sets the rules for what happens to an owner’s share when that owner leaves, dies, becomes disabled, retires, or wants to sell. It says who can buy the share, how the price is set, and how the buyout gets paid. It can be its own document or part of your operating agreement or partnership agreement.

What this means

This page is the main home for both outline lines on this subject: 6.2.6 Buy-sell provisions and 8.7.8 Buy-sell agreement.

A buy-sell plan answers four questions:

What triggers a sale? Common triggers are death, disability, retirement, quitting, divorce, bankruptcy, losing a required license, or wanting to sell.
Who can buy? Often the business or the other owners get the first chance. Many agreements block sales to outsiders without approval.
What’s the price? The agreement sets a method, like a yearly agreed value, a formula, or an outside appraisal.
How is it paid? Cash, payments over time, or insurance money, for example.

Say two partners own a plumbing company. One dies suddenly. Without a buy-sell plan, the partner’s spouse may inherit half the company, with no plumbing license and no interest in running it. With a plan, the business buys the share at a set price, and the spouse gets paid.

Why it matters

Ownership can land with the wrong person. Without limits, a share can pass to an heir, an ex-spouse, or a buyer the other owners don’t know.
Price fights are bitter. People who are grieving or angry rarely agree on value.
There may be no money to buy. Without a funding plan, the other owners may not be able to afford the buyout.
Default rules may not fit. The Small Business Administration (SBA) lists buy-sell and transfer rules, including what happens when a member dies, among the things an operating agreement should cover. Without one, state default rules apply.

Who this applies to

Every business with two or more owners. It matters most where the business depends on a license, a key skill, or one owner’s relationships.

A single owner doesn’t need a buy-sell agreement but does need a plan for who runs or sells the business if they can’t (see 27.7 Succession Plan).

How to do it

List the trigger events you want to cover.
For each trigger, decide whether a sale is required or optional, and who buys: the business or the remaining owners.
Choose a pricing method. Options include an agreed value updated every year, a formula, or an appraisal by a qualified professional.
If you use an agreed value, put a reminder on the calendar to update it every year. An old number can be far off.
Decide payment terms: a lump sum, or payments over a set number of years with interest.
Ask an insurance professional whether insurance could fund buyouts for death or disability (see 6.3.4 Insurance Professional).
Add limits on selling to outsiders, like requiring the other owners to get the first chance to buy.
Have an attorney write the agreement, and have a certified public accountant (CPA) review the tax effects.
Sign it, and update your ownership ledger after any buyout (see 8.7.4 Ownership Ledger).
Review it whenever ownership changes, and at least once a year.

What proof to keep

The signed buy-sell agreement or operating agreement section
Each year’s signed agreed value, if you use one
Insurance policies that fund the buyout, if any
Appraisals and buyout payment records

Keep these in your legal records folder. Tell a trusted person where to find them.

Common mistakes

Never updating the agreed value. A price set five years ago can shortchange an heir or overcharge the buyers.
No funding plan. A great price formula doesn’t help if no one has the money.
Forgetting disability. Death gets planned for more often than a long illness or injury.
Ignoring divorce. A share can end up in a divorce settlement unless the agreement addresses it.
Licensed trades with no license plan. If a licensed owner leaves, the business may lose the right to do certain work.

When to get help from a pro

Attorney: to write the agreement for your state and your type of business. Ask:

Which trigger events should require a sale, and which should be optional?
How do we keep a share from going to a buyer we don’t approve?

CPA: for tax effects of the price and payments. Ask:

How will a buyout be taxed for the seller and the buyer?

Insurance professional: for funding options.

Bill’s note

[Bill: add a short story or opinion here. For example, a business where a partner’s death or exit caused a mess, or what you’ve put in place for SiteSmarty.]

How I did this for SiteSmarty

[Date I did this:]
[What I actually did, step by step: buy-sell terms or succession plan I set up]
[What it cost and how long it took: attorney and insurance costs]
[What surprised me or what I’d do differently:]
[Screenshot or photo to add, with private info blurred: the buy-sell section of the agreement]
[Result so far:]

Questions people ask

What happens if my business partner dies? It depends on your agreement and state law. Without a buy-sell plan, their share may pass to their heirs.

How is a partner’s share valued? By the method in your agreement, such as a yearly agreed value, a formula, or an appraisal.

How do owners pay for a buyout? Common options are cash, payments over time, or insurance. An attorney, CPA, and insurance professional can help you choose.

Can my partner sell to anyone they want? Only if your agreement allows it. Many agreements give the business or the other owners the first chance to buy.

Audit check

Question: Is there a signed buy-sell agreement that covers triggers, buyers, price method, and funding?
Pass looks like: A signed agreement listing trigger events, who buys, a pricing method updated at least yearly, payment terms, transfer limits, and a funding plan.
Fail looks like: No agreement. An old agreed value. No funding. No rules for disability or divorce.
Evidence to collect: The signed agreement, the latest agreed value, and any funding insurance policy.

Where this fits

Do this first: 6.2.1 Ownership Percentages and Capital Contributions, 6.2.5 Deadlock Procedures

Do this next: 6.2.7 Intellectual-Property Ownership

Sources

U.S. Small Business Administration, "Basic information about operating agreements" (checked October 16, 2026)

This page explains general rules and Bill's own experience. It is not legal, tax, or insurance advice. Talk to a qualified professional about your situation.