Does a Buy-Sell Agreement Control How a Business Is Divided in an Illinois Divorce?

 Posted on July 26, 2026 in Asset Division

If you or your spouse owns a business with other partners, a buy-sell agreement signed years ago could affect what happens to those shares in a 2026 divorce. These agreements may provide a valuation method or restrict who can become an owner. A St. Charles, IL business owner divorce attorney can review your buy-sell agreement and explain how it applies to your case.

What Is a Buy-Sell Agreement?

According to the 2025 U.S. Small Business Administration's Office of Advocacy, Illinois had 1.4 million small businesses, many of which had more than one owner, as of March 2024.

A buy-sell agreement is a contract among business owners. It sets rules for what happens when an owner leaves the business, whether through retirement, death, disability, or divorce. Many agreements also set a formula or method for valuing the business when one of these events happens.

Buy-sell terms may appear in different business documents:

• A corporation may include them in a shareholder agreement.

• An LLC may include them in an operating agreement.

• A partnership may include them in its partnership agreement.

No matter which document contains the buy-sell terms, during a divorce, a court looks at the specific language in the agreement.

Buy-sell agreements often include a right of first refusal. This means other owners get the first chance to buy an interest before it can go to someone outside the business. Without this protection, a court could otherwise award business shares directly to a non-owner spouse.

Does a Buy-Sell Agreement Set the Final Value of a Business in Divorce?

Illinois divorce courts value marital property under 750 ILCS 5/503, and this statute does not bind a judge to a buy-sell price. Courts may consider the agreement as evidence of value, but they are not required to use its price or formula. 

The court can also consider appraisals, expert testimony, and other financial evidence of what the business interest is worth. That evidence often includes sensitive company records. Illinois courts can issue protective orders to limit who sees documents like client lists or pricing details during the case. The final valuation may differ from the agreement's formula. 

Under 750 ILCS 5/503(f), marital property generally must be valued as of the date of trial or another date as close to trial as possible. This means a buy-sell price set years earlier may not reflect the business's current value. A valuation formula in the agreement may still be useful, but the court must decide what the business interest is worth based on the evidence presented.

A buy-sell agreement may address valuation and transfer, but it does not decide whether the business interest is marital property in the first place. A business owned before marriage may be separate property. Its value growth usually stays separate, but the marital estate may have a reimbursement claim if marital funds contributed to the business or if a spouse’s significant personal effort caused substantial appreciation and the marital estate did not receive adequate compensation. The contribution must be traced by clear and convincing evidence.

Can a Buy-Sell Agreement Stop a Spouse From Receiving Business Shares in a Divorce?

A buy-sell agreement can affect whether a non-owner spouse ends up owning part of the business or receives its value in cash. If the agreement restricts who may hold shares and lists divorce as a trigger event, the court may consider those restrictions when deciding how to divide the business interest. The owner spouse may keep the shares while the other spouse receives cash or other marital property. 

However, not every agreement covers divorce, and some buy-sell agreements only address death or retirement. When that gap exists, the outcome is more open to negotiation or a judge's decision.

A business with no buy-sell agreement at all gives a court even more freedom to decide how ownership gets handled, through a business appraisal, a court-ordered buyout, or in rare cases, a forced sale.

Talk to a Kane County, IL Divorce Attorney About Protecting Your Business

The attorneys at Weiler & Associates, P.C. can review your buy-sell agreement and explain how it may affect your divorce. Tim Weiler is a Certified Financial Litigator with specific experience in complex financial matters like business ownership disputes in divorce. Call 630-331-9110 to schedule an appointment with a St. Charles, IL business owner divorce lawyer.