Buy-Sell Agreement Law in the United States

What Is a Buy-Sell Agreement?

A buy-sell agreement is a contract among business owners that governs the transfer of ownership interests upon specified triggering events. The agreement creates either obligations for surviving owners to purchase a departing owner's interest (cross-purchase) or obligations for the business entity itself to redeem the interest (entity redemption). These agreements ensure business continuity, provide liquidity for departing owners or their estates, establish valuation mechanisms, and prevent unwanted outsiders from acquiring ownership interests.

What must a buy-sell agreement include?

While no federal statute mandates specific contractual provisions, most effective buy-sell agreements contain the following elements shaped by federal tax considerations:

Valuation Mechanics

The agreement must specify how the purchase price will be determined. Common approaches include:

• Fixed price — stated dollar amount updated periodically
• Formula — book value, multiple of earnings, or other objective metric
• Appraisal — independent third-party valuation at triggering event

Federal tax law controls this choice—get it wrong and the IRS disregards your price. Under 26 U.S.C. § 2703, any option, agreement, or restriction that sets a price below fair market value is disregarded for estate and gift tax purposes unless the agreement satisfies a three-part safe harbor: (1) it is a bona fide business arrangement, (2) it is not a device to transfer property to family members for less than full and adequate consideration, and (3) its terms are comparable to similar arm's length arrangements (26 U.S.C. § 2703(b)).

A regulatory safe harbor provides clearer protection: if more than 50 percent by value of the restricted property is owned by non-family members subject to the same restriction, the agreement is deemed to satisfy all three requirements (26 C.F.R. § 25.2703-1(b)(4)(i)).

Triggering Events

Most agreements specify when the purchase obligation arises:

• Death of an owner
• Disability or incapacity
• Retirement or voluntary withdrawal
• Involuntary termination of employment
• Bankruptcy or insolvency
• Attempted transfer to non-permitted transferees

Funding Mechanisms

Life insurance is the most common funding source for death-triggered purchases. However, the structure matters critically for tax purposes. In Connelly v. United States, 602 U.S. 257 (2024), the Supreme Court held that where a corporation owns life insurance to fund a redemption obligation, the proceeds increase the corporation's fair market value for estate tax purposes—and the redemption obligation does not offset this increase. The Court noted that the parties "could have used a cross-purchase agreement (where shareholders buy each other's shares directly) rather than a redemption agreement to achieve different tax results."

Transfer Restrictions

Most agreements restrict owners' ability to sell or transfer interests to outsiders. Under 26 U.S.C. § 2703(a)(2), such restrictions are disregarded for estate tax valuation unless the § 2703(b) safe harbor applies.

Is my buy-sell agreement enforceable?

Tax Classification of Redemptions

For entity redemptions, 26 U.S.C. § 302 determines whether the distribution qualifies for capital gains treatment or is taxed as ordinary income. A redemption qualifies as a sale or exchange if it meets one of five tests:

If all tests fail, the distribution is treated as a dividend to the extent of corporate earnings and profits.

Constructive ownership rules under 26 U.S.C. § 318 attribute stock ownership from family members (spouse, children, grandchildren, parents), partnerships, estates, trusts, and corporations. For complete redemptions, family attribution may be waived under 26 U.S.C. § 302(c)(2) if the distributee has no corporate interest after redemption, acquires none within 10 years, and files a written agreement to notify the Secretary of the Treasury.

Life Insurance Transfer-for-Value Rule

When policies are transferred to fund buy-sell obligations, 26 U.S.C. § 101(a)(2) limits the income-tax-free death benefit unless an exception applies. The transfer-for-value limitation does not apply when the transfer is to: the insured; a partner of the insured; a partnership in which the insured is a partner; or a corporation in which the insured is a shareholder or officer (26 U.S.C. § 101(a)(2)(B)).

Timing and Modification Effects

If you created or changed your agreement after October 8, 1990, special tax rules apply. Under 26 C.F.R. § 25.2703-1(c), discretionary modifications that result in more than de minimis changes to rights or values are treated as creating new restrictions. Adding a family member as a party is generally a substantial modification unless mandatory under the agreement's terms.

What mistakes make a buy-sell agreement fail?

The Connelly Trap: Entity Redemption with Corporate-Owned Insurance

Using a redemption agreement funded by corporate-owned life insurance creates estate tax exposure that the redemption obligation does not offset. Life insurance proceeds increase corporate assets; the obligation to redeem shares does not reduce corporate value.

Failure to Update Valuations

In Connelly, the brothers' agreement required annual Certificates of Agreed Value and independent appraisals at death—neither was ever executed in 12 years. This procedural failure contributed to the agreement's failure to satisfy § 2703(b).

Substantial Modifications Without Recognition

Adding family members or changing valuation terms may trigger de novo § 2703 analysis as a substantial modification.

Transfer-for-Value in Cross-Purchase Structures

Transferring policies among shareholders to align funding may trigger § 101(a)(2) unless structured to qualify for the partner or shareholder exception.

Redemption Misclassification

Pro rata redemptions or structures where constructive ownership prevents disproportionate results typically fail § 302(b) tests, producing dividend treatment.

Second Class of Stock in S Corporations

Buy-sell terms that create commercial differences in shareholders' rights to distributions or liquidation proceeds may terminate S corporation status. Under 26 C.F.R. § 1.1361-1(l)(2)(iii), an agreement is taken into account only if both (1) a principal purpose is to circumvent the one-class-of-stock requirement, and (2) the price is significantly above or below fair market value. Safe harbors exist for book value pricing and for agreements triggered by death, divorce, disability, or termination of employment.

How do cross-purchase and entity redemption structures compare?

The structural choice has profound tax consequences.

What are the critical tax safe harbors and thresholds?

Where State Law Goes Further

This page addresses the federal baseline for estate and gift tax valuation, income tax characterization of redemptions, constructive ownership attribution, life insurance taxation, and S corporation qualification. These rules apply uniformly nationwide.

State law governs critical dimensions not addressed here:

• Contract formation and enforceability requirements
• Corporate and partnership law governing shareholder and member agreements
• Remedies for breach, including specific performance
• Fiduciary duty rules affecting director or officer approval of redemption terms
• Community property regimes that may affect spousal consent requirements

For state-specific requirements, see our state-by-state comparison or select your state: /law/state/[state]/documents/buy-sell-agreement/rules.

Open Questions Requiring Fact-Specific Analysis

Several areas remain incompletely addressed in available sources and require case-by-case analysis:

• Specific evidentiary standards for demonstrating "comparable" arm's length arrangements under § 2703(b)(3)
• Income tax basis consequences for purchasers in cross-purchase versus entity redemption structures
• Estate tax valuation rules specifically applicable to cross-purchase agreements (distinct from the entity redemption framework in Connelly)

Because the tax consequences of your buy-sell agreement depend on your specific business structure, ownership composition, and funding method, Ask Sawyer researches your specific structure to answer questions about your facts.