A non-compete agreement is a contract, usually between an employer and an employee, that restricts the employee from competing — working for a rival or starting a competing business — for a set period of time and within a set geographic area after the employment ends. It is one of several restrictive covenants employers use to protect their business when an employee leaves.
In Missouri, a non-compete is enforceable only when it is reasonable and protects a legitimate business interest, not when it is used simply to block ordinary competition.
How a non-compete works in Missouri
Missouri enforces reasonable non-competes but treats them as restraints of trade that are valid only to the extent they protect a legitimate interest — typically the employer's trade secrets, confidential information, or customer relationships (goodwill). Courts weigh three dimensions of reasonableness: the duration of the restriction, its geographic scope, and the range of activities it bars. A one-year term tied to the area where the employer actually does business is far more likely to be upheld than a long, industry-wide ban.
The governing statute, RSMo § 431.202, confirms that reasonable covenants are not unlawful restraints of trade and adds specific rules, including protections for certain employees — for example, the statute does not allow a non-compete to be enforced against a worker who provides only secretarial or clerical services. If an agreement is overly broad, a Missouri court can "blue-pencil" it — modifying the duration or geography to make it reasonable — and enforce it as modified rather than striking it down entirely.
Why it matters
For employees, a non-compete can limit where you work after leaving a job, so understanding whether it is reasonable, and what it actually restricts, matters before you sign or change jobs. For employers, a tightly drawn agreement tied to a real protectable interest is far more enforceable — and easier to defend in court — than an overreaching one. Because the analysis turns on specific terms and facts, both sides benefit from knowing what Missouri law requires.
Frequently Asked Questions
Are non-compete agreements legal in Missouri?
Yes. Missouri enforces non-competes that are reasonable and protect a legitimate interest such as trade secrets, confidential information, or customer relationships. A covenant meant only to prevent ordinary competition is not enforceable.
How long can a Missouri non-compete last?
There is no fixed statutory limit, but one-year restrictions are routinely upheld and two years is often acceptable when the protected interest justifies it. Longer terms face significant enforceability challenges.
Can a court change an overly broad non-compete?
Yes. Under Missouri's blue-pencil approach, a court may modify an unreasonable covenant — for example by shortening its duration or narrowing its geography — and enforce it as modified rather than voiding it entirely.
Legal Disclaimer
This page provides general legal information about Missouri law and is not legal advice. It does not create an attorney-client relationship. Every situation depends on its own facts, deadlines, and documents; consult a qualified Missouri attorney before acting.