A retaliation claim under Title VII, the ADA, the ADEA, the FMLA, or most whistleblower statutes generally requires proof of three things: the employee engaged in protected activity, the employer took a materially adverse action against the employee, and a causal connection links the two. Unlike discrimination claims, retaliation claims do not require the underlying complaint to have been correct, only that the employee held a reasonable, good-faith belief the conduct opposed was unlawful.

The Supreme Court's decision in Burlington Northern & Santa Fe Railway v. White broadened what counts as an adverse action for retaliation purposes beyond the discrimination context: it need not affect the terms of employment directly, only be significant enough that it would dissuade a reasonable worker from engaging in protected activity. Causation is often the most contested element, and close temporal proximity between the protected activity and the adverse action is commonly used, though not always sufficient alone, to establish it.

Retaliation claims frequently ride alongside an underlying discrimination or leave claim and, in many EEOC charge datasets, are the single most commonly filed theory, in part because the causal-proximity showing can be easier to build than a full discrimination record. In Juricratic, the protected-activity, adverse-action, and causation elements are modeled as three linked dials so a simulation can isolate which element is actually driving a case's projected exposure rather than treating retaliation as automatically riding on the strength of the underlying claim.

Litigators build the timeline first, mapping every protected activity against every subsequent employment decision, because temporal proximity is often the strongest available circumstantial evidence of causation. Defense counsel works to document a legitimate, independently timed basis for the adverse action, ideally one that predates the protected activity, to break the causal inference.