Good-cause standard after probation — Montana's rejection of at-will employment
Montana is the only US state that replaced the at-will employment doctrine with a statutory good-cause termination standard. Under the Wrongful Discharge from Employment Act, a discharge is wrongful if it was not for good cause and the employee had completed the employer's probationary period. This means that post-probation employees in Montana cannot be terminated without a job-related reason, distinguishing Montana from the 49 other states that generally allow at-will termination.
Source: Mont. Code Ann. § 39-2-904(1)(b)
Good-cause definition — four statutory prongs and the off-duty conduct exclusion
The Montana Wrongful Discharge from Employment Act defines "good cause" as "any reasonable job-related grounds for an employee's dismissal" based on one of four statutory prongs. This definition sets the substantive standard that determines whether a post-probation termination is lawful in Montana.
The four prongs
Good cause exists when the dismissal is based on:
(a) the employee's failure to satisfactorily perform job duties;
(b) the employee's disruption of the employer's operation;
(c) the employee's material or repeated violation of an express provision of the employer's written policies; or
(d) other legitimate business reasons determined by the employer while exercising the employer's reasonable business judgment.
Prong (d) functions as a general reasonableness standard that captures terminations outside the first three categories, so long as the employer's decision is job-related and reflects reasonable business judgment. The phrase "reasonable job-related grounds" in the chapeau qualifies all four prongs; personal animus or reasons unrelated to the employment relationship do not satisfy the statute.
Off-duty lawful conduct exclusion
The statute carves out an explicit exclusion: "The legal use of a lawful product by an individual off the employer's premises during nonworking hours is not a legitimate business reason, unless the employer acts within the provisions of 39-2-313(3) or (4)." This means an employer cannot terminate an employee for off-duty tobacco use, alcohol consumption (where lawful), or other legal product use during non-work hours, subject only to the narrow exceptions in Mont. Code Ann. § 39-2-313(3) (bona fide occupational requirement) and (4) (avoiding a conflict of interest or violation of a federal regulation or law).
Legislative history — the 2021 expansion
The current four-prong definition was enacted in 2021. Prior to 2021, the statute defined good cause more generally as "reasonable job-related grounds for dismissal based on a failure to satisfactorily perform job duties, disruption of the employer's operation, or other legitimate business reason." The 2021 amendments added prong (c) (written-policy violations) and prong (d) (reasonable business judgment), replacing the earlier catch-all with more specific enumeration and expressly tying the employer's discretion to reasonable business judgment.
Source: Mont. Code Ann. § 39-2-903(5)