A sworn written statement.

"Sworn" means the person signing it affirms the contents are true, usually under penalty of perjury. "Written" matters because a declaration is meant to put facts in the record without hauling everyone into court for live testimony at every turn. And "statement" means it should stick to facts the signer personally knows, not rumor, argument, or a dramatic retelling that would never survive a hard look. In lawsuits, declarations are often filed to support or oppose motions, explain documents, verify events, or lay out what a witness saw, did, or experienced.

Practically, a declaration can shape how a case moves before trial. In an injury claim, one might come from the injured person, a treating provider, or a witness who saw the crash, fall, or unsafe condition. A clear declaration can help establish notice, timing, pain levels, lost work, or why certain evidence matters. A sloppy one can be ignored, challenged, or used against the person who signed it.

In Massachusetts, declarations can matter early and often, but they do not extend filing deadlines. Personal injury claims are generally governed by the three-year statute of limitations in Mass. Gen. Laws ch. 260, § 2A (2024). Miss that deadline, and even the strongest declaration usually will not rescue the case.