Most employment in the United States operates under the at-will doctrine, and understanding it is the starting point for everything else.
What at-will means
An employer can terminate employment at any time, for any lawful reason or no reason at all, without notice. And you can quit at any time, on the same terms.
At-will applies in 49 states. Montana is the only exception, where after a probationary period an employer needs good cause to terminate.
The word that matters: lawful
At-will is not unlimited. An employer cannot terminate you for a reason that is illegal, and there is a substantial list of those.
You cannot lawfully be fired because of:
- Race, colour, religion, sex or national origin — Title VII
- Disability — the ADA
- Age, if you are 40 or over — the ADEA
- Retaliation for reporting discrimination, safety violations or wage theft
- Taking leave you are legally entitled to
There is no notice requirement
Unlike most of the world, federal law requires no notice period and no severance pay. Neither is mandated by federal or state law.
Severance is a matter of contract or company policy, not entitlement.
The exceptions that do exist
Employment contracts, union collective bargaining agreements and some public sector arrangements displace at-will. If you have any of those, different rules apply.
Some states also recognise implied contract or public policy exceptions developed through case law.
The WARN Act
For mass layoffs and plant closings, the federal WARN Act requires advance notice from covered employers, and several states have their own stricter versions.
What this means practically
Your protection comes less from job security law and more from anti-discrimination and anti-retaliation law.
If you believe a termination was for an illegal reason, document what happened and when. That documentation is what a claim rests on.