General legal information, published for everyone. It does not apply the law to anyone’s particular situation and is not legal advice. Laws change and differ by place; check the primary sources below.
Quick summary
- Every state except Montana starts from at-will employment.
- At-will employment does not allow terminations for reasons the law prohibits, such as discrimination or retaliation for protected activity.
- Contracts, collective bargaining agreements, and employer policies can limit at-will termination.
- Separate rules govern final pay, mass layoffs, health-coverage continuation, and severance releases.
What it means
Under the at-will default, an employer does not need a good reason, or any stated reason, to end employment, and an employee can quit without notice. What the employer cannot do is terminate for an unlawful reason or in breach of a promise that limits its right to terminate.
Most disputes about termination are therefore about why the termination happened and what was promised, not about whether the employer had "cause."
Key terms
- At-will employment
- Employment that either party may end at any time, with or without cause or notice, subject to legal limits.
- Wrongful termination
- A general term for a termination that violates a statute, a contract, or a recognized public-policy rule.
- Protected characteristic
- A trait, such as race, sex, religion, national origin, age (40+), or disability, that anti-discrimination laws protect.
- Protected activity
- Conduct such as complaining about discrimination, taking protected leave, or acting together with coworkers about working conditions, which the law protects from retaliation.
- For-cause termination
- A termination based on reasons defined in a contract or policy, used where at-will employment has been limited.
- Release
- An agreement, often in a severance package, in which an employee gives up legal claims in exchange for payment or benefits.
How the law works
The at-will default and Montana
At-will employment is a common-law presumption in every state except Montana. Montana's Wrongful Discharge from Employment Act (Mont. Code Ann. § 39-2-901 and following) generally requires good cause to discharge an employee after a probationary period.
Statutory limits: discrimination and retaliation
Federal laws prohibit termination because of protected characteristics, including Title VII of the Civil Rights Act of 1964 (race, color, religion, sex, and national origin; employers with 15 or more employees), the Age Discrimination in Employment Act (workers 40 and older; employers with 20 or more employees), and the Americans with Disabilities Act (employers with 15 or more employees). These laws also prohibit retaliation for opposing discrimination or participating in an investigation or proceeding. Many state and local laws cover smaller employers and additional characteristics.
Other laws protect specific activity: the Family and Medical Leave Act prohibits interference with and retaliation for protected leave (employers with 50 or more employees), and the National Labor Relations Act protects most private-sector employees who act together about pay or working conditions, whether or not they are in a union.
Contract and policy limits
An employment contract for a fixed term, or one that allows termination only "for cause," changes the at-will default. Collective bargaining agreements usually require just cause and a grievance process. In some states, statements in handbooks or offer letters can create enforceable promises unless the employer clearly disclaims them. Some states also recognize a public-policy exception (for example, for terminations because an employee refused to break the law or served on a jury) or an implied covenant of good faith.
Final pay, benefits, and notice
- Final paycheck. Federal law does not set a deadline for a final paycheck; state laws do, and they vary. California, for example, generally requires immediate payment on discharge (Cal. Lab. Code § 201) and imposes waiting-time penalties for late payment (§ 203).
- Mass layoffs. The WARN Act generally requires employers with 100 or more employees to give 60 days' written notice of a plant closing or mass layoff (29 U.S.C. § 2102). Some states have their own "mini-WARN" laws.
- Health coverage. COBRA lets employees covered by a group health plan of an employer with 20 or more employees continue coverage for a period at their own cost (29 U.S.C. § 1161 and following).
- Unemployment insurance. Eligibility is set by state law; a termination for misconduct can affect eligibility.
Severance agreements and releases
Federal law generally does not require severance pay. When severance is offered in exchange for a release of claims, the release must be knowing and voluntary. Releases of age-discrimination claims must meet the Older Workers Benefit Protection Act requirements, including at least 21 days to consider the agreement (45 days in a group program) and 7 days to revoke after signing (29 U.S.C. § 626(f)). Some rights, such as filing a charge with the EEOC, cannot be waived.
Examples
Hypothetical example
A termination with no stated reason
An employer in an at-will state ends a sales associate's employment and gives no reason. Without a contract limiting termination, the absence of a reason is not itself unlawful. Whether a claim exists would depend on whether evidence shows an unlawful reason, such as discrimination or retaliation.
Hypothetical example
A termination soon after protected leave
An employee returns from FMLA leave and is terminated the following week. Timing alone does not establish retaliation, but close timing is one kind of evidence courts consider alongside the employer's documented reasons.
Common questions
Does an employer have to give a reason for a termination?
Under at-will employment, federal law generally does not require a stated reason. Some states require a written notice of separation or a service letter on request, and contracts or policies may require reasons.
Is two weeks' notice legally required?
Not under at-will employment, for either side, unless a contract or collective bargaining agreement requires it. The WARN Act is a separate notice rule for large layoffs.
Can an employer terminate someone who is on medical leave?
Being on leave does not make an employee immune from termination for reasons unrelated to the leave, but the FMLA and the ADA prohibit terminating because of protected leave or a disability, and prohibit interfering with leave rights.
Does federal law require severance pay?
Generally no. Severance is usually a matter of contract, policy, or negotiation. When it is offered in exchange for a release, specific rules apply, especially for employees aged 40 or older.
Important distinctions
"Unfair" vs. "unlawful"
A termination can be unfair or poorly handled without being unlawful. Legal claims generally depend on a statute, a contract, or a recognized public-policy rule.
Layoff vs. termination for cause
A layoff ends employment for business reasons such as restructuring; a for-cause termination is based on conduct or performance. The distinction can matter for unemployment eligibility, severance policies, and WARN Act notice.
Primary sources
- StatuteMont. Code Ann. § 39-2-901 et seq.Montana Wrongful Discharge from Employment ActMontana
- Statute42 U.S.C. § 2000e-2Title VII — unlawful employment practicesUnited States (federal)
- Statute42 U.S.C. § 2000e-3(a)Title VII — retaliationUnited States (federal)
- Statute29 U.S.C. § 623Age Discrimination in Employment Act — prohibited practicesUnited States (federal)
- Statute42 U.S.C. § 12112Americans with Disabilities Act — discrimination in employmentUnited States (federal)
- Statute29 U.S.C. § 2615Family and Medical Leave Act — prohibited actsUnited States (federal)
- Statute29 U.S.C. §§ 157, 158National Labor Relations Act — employee rights and unfair labor practicesUnited States (federal)
- Statute29 U.S.C. § 2102WARN Act — notice required before plant closings and mass layoffsUnited States (federal)
- Statute29 U.S.C. § 1161COBRA continuation coverageUnited States (federal)
- Statute29 U.S.C. § 626(f)Older Workers Benefit Protection Act — waiver requirementsUnited States (federal)
- StatuteCal. Lab. Code §§ 201, 203California final pay and waiting-time penaltiesCalifornia
- Agency guidanceU.S. Department of Labor — last paycheckUnited States (federal)Explains that final-pay timing is governed by state law.
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- Last updated
- Oct 8, 2026
- Jurisdiction
- United States (federal), with state variations
- Written by
- House Legal editorial (AI-assisted)