Missouri Non-Compete Law: Enforceability, Reasonableness, and Defenses

Missouri non-compete law enforces these agreements when they protect a legitimate business interest and stay reasonable in how long they last, how far they reach, and what they prohibit. Two statutes do the heavy lifting: Section 431.202 governs employer-employee covenants, and Section 431.204 covers covenants tied to selling or leaving a business. Around those statutes, decades of case law give Missouri courts wide discretion to decide whether a specific restriction goes too far, and to narrow it if it does.

What Missouri Actually Enforces

The statutes set up a two-track system. Which track applies depends on whether you signed the agreement as an employee or as a business owner.

Employee Covenants

Under Section 431.202, a non-compete between an employer and employee is enforceable when it protects confidential or trade-secret information, or customer and supplier relationships, goodwill, and loyalty. Customer and supplier relationships are explicitly named as protectable employer interests.¹

The statute also allows non-competes without a specific protectable interest, so long as the restriction lasts no more than one year after employment ends. A covenant tied to a protectable interest and running one year or less carries a conclusive presumption of reasonableness, which makes it much harder to challenge.¹

Business-Owner Covenants

When someone sells their stake in a business or leaves ownership, Section 431.204 governs. A restriction on recruiting former employees is presumed enforceable for up to two years. A restriction on soliciting customers the owner personally dealt with is presumed enforceable for up to five years.²

Section 431.204 also tells courts what to do with an overbroad owner covenant: narrow it and enforce the modified version, rather than throw it out.²

What Counts as a Protectable Interest

A general wish to keep former employees out of the market isn’t enough. In Healthcare Services of the Ozarks, Inc. v. Copeland, the Missouri Supreme Court held that non-competes are enforceable only in limited circumstances where the restriction is reasonable and tied to a genuine business need.³

Missouri courts consistently recognize three categories of legitimate interest:

Trade secrets and confidential information — proprietary formulas, processes, pricing strategies, internal financial data, and similar material the employer took steps to keep private.
Customer and supplier relationships, where an employee developed personal goodwill with clients on the employer’s behalf.
Specialized training investments, when the employer put substantial resources into skills or knowledge unique to the business.

Many non-compete disputes turn on this element. If the employer can’t point to something concrete on this list that the restriction actually protects, the agreement is vulnerable regardless of how it’s drafted.

Reasonableness: Time, Place, and Activity

Even a legitimate interest doesn’t rescue an unreasonable restriction. Courts evaluate three dimensions together, and a failure on any one can sink the agreement.

How Long It Lasts

One year or less, tied to a protectable interest, is presumed reasonable under Section 431.202.¹ Two years can hold up with strong justification, such as senior-level client responsibility or deep trade-secret access. Longer than two years for an employee covenant draws heavy scrutiny. For owner covenants, the statutory outer limits are two years on employee solicitation and five years on customer solicitation.²

How Far It Reaches

The geographic scope has to roughly match where the employer actually does business. A statewide restriction fails when the employer only operates in one metro area. In Systematic Business Services, Inc. v. Bratten, the Missouri Court of Appeals struck down a non-compete whose geography stretched well beyond the employer’s actual footprint.⁴

What It Prohibits

The banned activities need to line up with the employee’s actual role and the interests at risk. A blanket ban on any work for any competitor is the kind of overreach that gets agreements struck down. In AEE-EMF, Inc. v. Passmore, the court invalidated a non-compete that was too vague and sweeping in the activities it restricted.⁵ Restrictions that target specific threats — soliciting existing clients, using proprietary methods, recruiting former colleagues — hold up better than sweeping prohibitions.

Consideration: Signing After You’re Already Hired

Signing a non-compete on your first day is straightforward. The job itself is the consideration, and that rarely gets challenged successfully.

Signing one later is different. The Missouri Supreme Court held in Baker v. Bristol Care that an employer’s promise to continue employing an at-will employee wasn’t sufficient consideration to enforce a restrictive covenant. That case involved an arbitration agreement, but the reasoning applies to non-competes as well. If your employer asks you to sign one after you’ve been working there, they should pair it with something tangible: a raise, a promotion, a bonus, or new responsibilities. Without that, the consideration argument is one of the strongest defenses available.

Who Has to Prove What

The employer carries the burden. To enforce a non-compete, the employer has to prove the agreement protects a legitimate interest and is reasonable in time and geographic reach. The Missouri courts reaffirmed this allocation in Jefferson City Medical Group, P.C. v. Brummett (2024), where an injunction enforcing a physician’s non-compete was upheld.

The practical effect: an employee doesn’t have to prove the agreement is unreasonable. The employer has to prove it’s reasonable. If the employer’s evidence is thin on any element, the agreement fails.

What Happens if the Agreement Is Overbroad

Missouri follows a “reasonable alteration” approach. Rather than voiding the whole agreement, courts can narrow the geographic area, shorten the duration, or limit the restricted activities to what’s reasonably necessary. Section 431.204 codifies this for owner covenants and directs courts to modify and enforce.²

For employee covenants the authority comes from case law. In Whelan Security Co. v. Kennebrew, the Missouri Supreme Court found the non-competes unreasonable as written but modified their terms to reflect the parties’ intent rather than voiding them.⁶

The consequences cut both ways. Employees can’t count on an overbroad agreement being tossed. Employers can’t safely draft aggressively and rely on courts to rewrite the terms, because the modified version is unpredictable. Getting the drafting right at the start is the only reliable strategy.

Defenses Employees Commonly Raise

No protectable interest. The employer can’t point to trade secrets, confidential information, or customer relationships the restriction actually guards. Generic “competitive advantage” claims aren’t enough.
Unreasonable scope. Duration, geography, or prohibited activities go beyond what the employer’s interests require.
Lack of consideration. The agreement was signed after employment began with nothing new offered in return, invoking the Baker v. Bristol Care reasoning.
Unequal bargaining power. The agreement was a take-it-or-leave-it condition with no room to negotiate. In Mid-States Paint & Chemical Co. v. Herr, the court weighed the absence of bargaining power as an important factor.⁷
Less restrictive alternatives. A confidentiality clause or a narrow non-solicitation agreement would adequately protect the employer’s interests, making a full non-compete unnecessary.

Employees terminated without cause may have stronger arguments on fairness grounds, though Missouri courts haven’t categorically exempted involuntarily terminated employees from non-compete obligations. The specific facts matter.

What Happens if You Violate One

The most common remedy is an injunction ordering the employee to stop the competing activity. Missouri courts have held that the fact of an employee working in a competing field can itself justify injunctive relief, without the employer needing to first prove that specific customers were solicited or specific trade secrets disclosed. Once a valid non-compete exists and the employee is competing, harm is presumed.

Employers can also recover monetary damages when they show actual financial harm, such as lost customers or diverted revenue. Attorneys’ fees may be recoverable if the agreement includes a fee-shifting clause, but courts have limited fee recovery where they had to modify the agreement before enforcing it, on the reasoning that the employer didn’t fully prevail on the original terms.

For an employee, ignoring a non-compete you think is unenforceable is a gamble. If a court disagrees with your read, you can be pulled out of your new job by injunction and hit with damages on top. Challenging the agreement’s validity up front, or at the moment you start competitive work, is safer than assuming your employer won’t act.

The Clerical Worker Carve-Out

Section 431.202 explicitly excludes employees who provide only secretarial or clerical services from the provision allowing non-competes without a specific protectable interest.¹ If you’re in a clerical role and your employer has no trade secrets or customer relationships tied to your work, a non-compete against you is unlikely to hold up.

Federal Rule Status

The Federal Trade Commission’s 2024 rule attempting to ban most non-competes nationwide did not survive. Federal courts struck it down, and on September 5, 2025, the FTC voted to dismiss its appeals. The rule was formally removed from the Code of Federal Regulations effective February 12, 2026.⁸

The FTC still has authority under Section 5 of the FTC Act to challenge individual non-competes it considers unfair, particularly those affecting lower-level workers or involving exceptionally broad terms. But there is no federal ban. If you’re working under a Missouri non-compete, the state’s statutes and case law are what govern it.

1
Missouri Revisor of Statutes. Missouri Revised Statutes – Section 431.202
2
Missouri Revisor of Statutes. Missouri Revised Statutes – Section 431.204
3
Justia. Healthcare Services v. Copeland
4
Justia. Systematic Business Services Inc v. Bratten
5
Justia. AEE-EMF Inc v. Passmore
6
Justia. Whelan Security Co v. Kennebrew
7
Justia. Mid-States Paint and Chemical Co v. Herr
8
Federal Register. Revision of the Negative Option Rule, Withdrawal of the CARS Rule, Removal of the Non-Compete Rule