Burden of Proof: The Three Standards and Who Carries Each

The burden of proof is a party's duty to prove a disputed claim, and it has two parts: the burden of production (offering enough evidence on an issue for the trier of fact to decide it rather than have it decided as a matter of law) and the burden of persuasion (convincing the trier of fact that the disputed proposition is true under the applicable standard). The party that bears the burden in a given case loses if the evidence is in equipoise. Three standards govern almost every American court proceeding: preponderance of the evidence, clear and convincing evidence, and beyond a reasonable doubt.

The Three Burdens at a Glance

Standard	Probability	Where It Applies
Preponderance of the evidence	More likely than not (greater than 50%)	Most civil cases: contracts, torts, employment, family, ordinary fraud
Clear and convincing evidence	Highly probable (~70-80%)	Civil fraud, termination of parental rights, civil commitment, punitive damages, will contests
Beyond a reasonable doubt	Near certainty	Every element of every criminal offense in state and federal court

Who Bears the Burden?

The general rule is that the party making an affirmative claim bears the burden on that claim. The plaintiff bears the burden on every element of every cause of action in the complaint. The defendant bears the burden on every affirmative defense: contributory negligence, statute of limitations, accord and satisfaction, fraud, duress, waiver, estoppel, and the rest of the list in Federal Rule of Civil Procedure 8(c). In criminal cases, the prosecution bears the burden of proving every element beyond a reasonable doubt, but a defendant who pleads an affirmative defense like self-defense or insanity bears the burden of producing some evidence of that defense; some states then require the defendant to persuade the jury by a preponderance, and others shift the burden back to the prosecution to disprove the defense beyond a reasonable doubt.

Preponderance of the Evidence

"Preponderance" is the lowest civil standard. The fact-finder must conclude that the disputed fact is more likely true than not, even if only by the slightest margin. The standard is usually described to juries as "more probably than not" or as "tipping the scales of justice ever so slightly to one side." It applies to almost every civil claim that does not involve punishment, fraud, or the loss of fundamental rights.

Clear and Convincing Evidence

The middle standard requires the fact-finder to be persuaded that the truth of the contention is "highly probable" or that the evidence produces a "firm belief or conviction." The Supreme Court has held that this standard is constitutionally required in cases involving the deprivation of important interests, including termination of parental rights (Santosky v. Kramer) and civil commitment (Addington v. Texas). Most jurisdictions also apply it to punitive damages, civil fraud, and contests of testamentary capacity.

Beyond a Reasonable Doubt

The criminal standard is the highest in American law. The Supreme Court held in In re Winship that due process requires proof beyond a reasonable doubt of every fact necessary to constitute the crime charged. Reasonable doubt is "such a doubt as would cause a reasonable, prudent person to hesitate to act in the most important affairs of life," not every conceivable doubt. Pattern jury instructions in every federal circuit and almost every state codify a version of this language; deviating from the pattern is a frequent ground for appeal.

Burden of Production vs. Burden of Persuasion

The two are often conflated but operate differently. The burden of production governs whether the case goes to the jury at all: if the party with the burden offers no evidence on an essential element, the court grants a summary judgment motion or a directed verdict and the case ends without the jury voting. The burden of persuasion governs how the jury is instructed to vote once the case is submitted: even with evidence on both sides, the jury must find for the party with the burden only if the evidence meets the applicable standard.

Shifting Burdens

In some causes of action, the burden shifts after one party meets its initial showing. The classic example is the McDonnell Douglas framework in employment discrimination: the plaintiff makes a prima facie case, the defendant articulates a legitimate non-discriminatory reason, and the burden shifts back to the plaintiff to prove pretext. Other shifting frameworks appear in res ipsa loquitur, products liability under Restatement section 402A, and certain ERISA fiduciary claims.

Why the Burden Decides Cases

Cases where the evidence is roughly balanced are decided by who bears the burden. That is why affirmative defense pleading matters so much in answer drafting: each unpleaded affirmative defense is waived under Rule 8(c), shifting an issue the defendant could have won onto an issue the plaintiff need not prove. Our litigation team drafts answers and complaints that allocate burdens correctly the first time.

Frequently Asked Questions

What is burden of proof in simple terms?

The burden of proof is the duty to prove a disputed claim. The party that bears the burden must offer enough evidence to satisfy a legal standard ranging from "more likely than not" in most civil cases, to "clear and convincing" in cases involving fundamental rights or fraud, to "beyond a reasonable doubt" in every criminal case. If the evidence is in balance, the party with the burden loses.

What are the three burdens of proof?

The three standards are preponderance of the evidence (more likely than not, used in most civil cases), clear and convincing evidence (highly probable, used in fraud, punitive damages, parental-rights termination, and civil commitment), and beyond a reasonable doubt (near certainty, used in every criminal case for every element of the offense).

Who has the burden of proof in a civil case?

The plaintiff bears the burden of proving every element of every claim by a preponderance of the evidence. The defendant bears the burden of proving every affirmative defense, also by a preponderance, unless a statute or constitutional doctrine raises the standard. A few causes of action shift the burden mid-trial under frameworks like McDonnell Douglas or res ipsa loquitur.

Who has the burden of proof in a criminal case?

The prosecution bears the burden of proving every element of every charged offense beyond a reasonable doubt. A defendant who pleads an affirmative defense like self-defense or insanity may bear an initial burden of production, but the constitutional rule from In re Winship requires the prosecution to disprove every element of the offense to the highest standard.

When to Hire a Litigation Lawyer

The burden of proof is allocated on the face of the pleadings. A complaint that pleads the wrong elements, or an answer that omits an affirmative defense, can lose a case before the first deposition. Our litigation team drafts complaints and answers that allocate every burden correctly under the applicable substantive law.