How Retaliation Claims Work

Reviewed by Cleo Delmar (CD), Editor-in-Chief — Employment & Civil Rights Practice. Updated May 2026.

A retaliation claim in the employment law context has a specific legal structure: three elements that the employee must prove, each of which has a distinct legal definition that courts and juries apply. Understanding these elements — and the specific legal standards that govern them — is essential for evaluating whether a retaliation claim has merit and how to build the evidence needed to support it.

Element 1: Protected Activity

Protected activity is the legally recognized conduct that triggers anti-retaliation protection. Not all employee complaints or disputes with an employer are "protected" in the legal sense — the activity must fall within the specific categories defined by the applicable statute. Protected activity divides into two categories under most federal statutes:

Opposition activity is conduct where the employee opposes what they reasonably believe to be an unlawful employment practice. This includes: filing an internal complaint with HR; sending an email to management objecting to discriminatory treatment; consulting an attorney about rights; refusing to implement a policy the employee reasonably believes is discriminatory; and organizing coworkers around a wage complaint. The belief must be reasonable — courts do not require that the underlying practice actually be illegal, only that the employee’s belief that it was illegal was reasonable.

Participation activity is involvement in formal proceedings: filing an EEOC charge, testifying in a judicial or administrative discrimination proceeding, or participating as a witness in an employer’s internal investigation. Participation activity receives the strongest protection because it relates directly to the enforcement machinery Congress created.

The scope of protected activity varies by statute. FLSA protection covers filing wage complaints and participating in DOL investigations. OSHA Section 11(c) covers reporting safety hazards, requesting inspections, and refusing imminently dangerous work. Workers’ compensation statutes protect the act of filing a claim. State whistleblower statutes often extend protection to internal reports and reports to any government agency, not just specific agencies — a significant expansion over the more targeted federal frameworks.

Element 2: Materially Adverse Action

The second element requires an adverse action by the employer. The Supreme Court defined the standard for Title VII retaliation in Burlington Northern & Santa Fe Railway Co. v. White, 548 U.S. 53 (2006): the employer must have taken an action that would have been materially adverse to a reasonable employee — meaning an action that would dissuade a reasonable employee in the same position from making or supporting a charge of discrimination.

The Burlington Northern standard is broader than the standard for direct discrimination claims. It does not require economic harm in every case, and it does not require termination. Courts have found materially adverse actions in:

What does not meet the standard: petty slights, minor annoyances, personality conflicts, and snubs that would not affect a reasonable employee’s decision to report. The standard is objective — the question is not whether the specific plaintiff found the action adverse, but whether a reasonable employee in that position would.

Element 3: Causation

The employee must prove that the protected activity caused the adverse action. The causation standard for Title VII retaliation was established by the Supreme Court in University of Texas Southwestern Medical Center v. Nassar, 570 U.S. 338 (2013): the employee must prove that the protected activity was the but-for cause of the termination — that is, the employer would not have taken the adverse action but for the protected activity. This is a higher standard than the "motivating factor" test that applies to direct Title VII discrimination claims.

Employees establish causation through direct or circumstantial evidence. Direct evidence is a statement by a decision-maker expressing hostility to the protected activity (e.g., a supervisor saying "you got yourself fired by going to HR"). This is rare. Circumstantial evidence is more common and includes:

Damages by Statute

Once the three elements are established, the damages available depend entirely on which statute or statutes apply:

See the types of protected activity guide, the what to do after retaliatory firing guide, or return to the calculator.