Defeating a statute of limitations motion: how to keep the case alive

A defendant has just filed a [motion](/insights/glossary/motion) to dismiss your client's complaint on [statute](/insights/glossary/statute) of limitations grounds. The math, on the face of the complaint, may look bad. The deadline appears to have passed. The defendant is asking the court to end the case before discovery, before any factual development, and with prejudice. This guide walks through how to respond.

The good news is that limitations is a fact-laden defense that often survives the pleading stage even when the surface numbers favor the defendant. The discovery rule, multiple tolling doctrines, the continuing-wrong theory, and Rule 15 relation-back all provide doctrinal paths to preserve a claim that looks time-barred at first glance. The plaintiff's job at the response stage is to identify which paths apply and to plead the underlying facts with the specificity courts require.

Why limitations motions often fail at the pleading stage

Statute of limitations is an affirmative defense. The defendant bears the burden of proof. Under Jones v. Bock, 549 U.S. 199, 215 (2007), an affirmative defense can support dismissal under Rule 12(b)(6) only when the applicability of the defense is "clear from the face of the complaint." That is a higher bar than defendants often acknowledge.

When the complaint pleads facts that, taken as true, leave any ambiguity about accrual, tolling, or the timing of the wrongful conduct, the limitations defense generally cannot be resolved on the pleadings. The defendant must either wait for summary [judgment](/insights/glossary/judgment) after a discovery record is built, or hope that the court will accept a narrow reading of the complaint that the plaintiff is not bound to accept. A well-pleaded response brief makes both options unattractive.

The response strategy has three components. First, contest accrual: show that the complaint plausibly alleges accrual within the limitations window. Second, plead tolling: identify the doctrines that pause or extend the clock and ensure the underlying facts are alleged. Third, frame the dispute as factual: argue that any limitations dispute that cannot be resolved on the four corners of the complaint must be deferred to summary judgment or trial.

The discovery rule

The single most important doctrine for the plaintiff facing a limitations motion is the discovery rule. The default rule in most jurisdictions and for most federal claims is that a cause of action accrues when the plaintiff knew or reasonably should have known of the injury and its cause.

The Supreme Court's articulation of the standard accrual rule appears in Wallace v. Kato, 549 U.S. 384, 388 (2007): a claim "accrues when the plaintiff has a complete and present cause of action." For most claims that moment coincides with when the plaintiff discovers the injury, though the precise formulation varies by claim type.

The Court has applied the discovery rule with particular care in fraud and concealment contexts. In Rotella v. Wood, 528 U.S. 549, 555-56 (2000), a civil RICO case, the Court adopted an "injury discovery" rule, holding that the claim accrued when the plaintiff discovered or should have discovered the injury, even if the racketeering pattern itself had not been fully discovered. The Court distinguished between discovering an injury (which starts the clock) and discovering every legal element of the claim (which does not).

The discovery rule has practical consequences for how the response brief should be structured. The complaint will allege facts about when the plaintiff actually became aware of the injury. The response should highlight those allegations and argue that, even if the wrongful conduct occurred years earlier, the limitations clock did not begin until the discovery event the complaint identifies. The defendant must accept those allegations as true at this stage.

A common defendant tactic is to argue that the plaintiff "should have discovered" the injury earlier, based on facts in the complaint suggesting opportunities for earlier discovery. That argument requires fact-finding the court cannot do on a 12(b)(6) motion. The response should point this out: whether the plaintiff exercised reasonable diligence in discovery is a quintessential fact question for the jury.

Fraudulent concealment

When the defendant actively concealed the wrong, equitable tolling pauses the clock until the plaintiff discovers or could reasonably have discovered the underlying claim. Holmberg v. Armbrecht, 327 U.S. 392, 397 (1946), is the leading federal authority: "where a plaintiff has been injured by fraud and remains in ignorance of it without any fault or want of diligence or care on his part, the bar of the statute does not begin to run until the fraud is discovered."

Fraudulent concealment tolling has teeth, but it requires specific pleading. Most courts require the plaintiff to allege:

1. A wrongful act by the defendant that was actively concealed.
2. The plaintiff's failure to discover the operative facts despite the exercise of due diligence.
3. The plaintiff's eventual discovery of the facts.

Rule 9(b) particularity often applies to concealment allegations, particularly in jurisdictions that treat concealment as a species of fraud. The response brief should walk through each element and identify the complaint paragraphs that allege it. If the complaint is thin on any element, consider seeking leave to amend to add the missing allegations.

Minority and incapacity tolling

In most jurisdictions, the limitations clock does not run against a person who is a minor or who is mentally incapacitated at the time the claim accrues. The clock begins when the disability is removed. The Supreme Court confirmed in Hardin v. Straub, 490 U.S. 536, 542-43 (1989), that state tolling rules for minority and incapacity apply to federal § 1983 claims that borrow state limitations periods. The Court emphasized the importance of giving full effect to state tolling provisions, not just the bare limitations period.

For the response brief, the move is straightforward. If the complaint pleads facts establishing the plaintiff's minority or incapacity at the time of accrual, identify the forum's tolling statute, calculate the tolled deadline, and show that the suit was filed within it. If the disability extended for years, the calculation may push the deadline well past the apparent surface deadline.

Practitioners should note that tolling for incapacity is not automatic. Most jurisdictions require a showing of incapacity sufficient to prevent the plaintiff from understanding the legal rights at stake. Mere illness, ordinary depression, or post-traumatic stress without specific functional impairment is usually not enough. The response should plead the underlying facts.

Continuing wrongs

Where the harm is ongoing rather than a single discrete event, the continuing-wrongs doctrine treats each new wrongful act as restarting the clock. The Supreme Court applied the doctrine in National Railroad Passenger Corp. v. Morgan, 536 U.S. 101, 117 (2002), holding that a hostile work environment claim is timely so long as one act contributing to the claim falls within the limitations period.

Morgan also drew a critical line. Discrete acts (a termination, a failure to promote, a denial of transfer) are time-barred if they occurred outside the limitations period, even if they are part of a longer pattern of related conduct. Id. at 113-14. Continuing-wrong tolling applies to the integrated, cumulative harm of a hostile environment but not to the discrete decisions that produced it.

The response brief must frame the conduct correctly. Where the case alleges a course of conduct that culminates in cumulative harm (nuisance, hostile environment, ongoing surveillance, repeated trespass), argue continuing wrong and identify the most recent actionable act. Where the case alleges a single decision with continuing consequences (a termination, a contract breach, a misdiagnosis), the doctrine does not apply and the response should rely on discovery-rule and tolling theories instead.

Equitable estoppel

When the defendant induced the plaintiff to delay filing through representations or conduct, the defendant may be estopped from raising limitations. The classic case is a settlement negotiation in which the defendant represents that the claim will be resolved without litigation and then asserts limitations after the period has expired. The doctrine is fact-intensive and rarely resolved on the pleadings.

For the response brief, equitable estoppel is usually a backup argument. Plead it if the facts support it, but expect the court to defer the question to summary judgment if the underlying conduct is contested.

Savings statutes

Most states have savings statutes that give the plaintiff a window (typically six months to one year) to refile after a non-merits dismissal. When an earlier filing was timely but was dismissed on procedural grounds, the savings statute can preserve the right to refile even if the original limitations period has since expired.

The response brief should check whether a savings statute applies. The analysis is jurisdictionally specific and turns on whether the original dismissal qualifies as a non-merits disposition. A dismissal for lack of personal [jurisdiction](/insights/glossary/jurisdiction) or improper venue almost always qualifies. A dismissal for failure to state a claim usually does not.

Relation back under Rule 15(c)

When the plaintiff needs to add a claim or change a party after the limitations period has run, Rule 15(c) provides the doctrinal vehicle. An amendment relates back to the date of the original pleading when the amendment asserts a claim arising out of the same conduct, transaction, or occurrence set out in the original pleading. For changes of party, the rule requires additional showings: the party to be added must have received notice of the action within the Rule 4(m) service period and must have known or should have known that the action would have been brought against it but for a mistake concerning the proper party's identity.

The Supreme Court clarified the mistake requirement in Krupski v. Costa Crociere S.p.A., 560 U.S. 538, 548 (2010), holding that the relevant question is "what the prospective defendant knew or should have known," not what the plaintiff knew or should have known. A plaintiff who genuinely confused two related corporate entities, named the wrong one in the original complaint, and sought to substitute the correct one after the limitations period can rely on Rule 15(c) so long as the correct entity had notice and understood that it was the intended target.

When responding to a limitations motion that turns on relation back, the brief should walk through the Rule 15(c) elements, identify the facts supporting each, and (where possible) attach a proposed amended complaint that crystallizes the relation-back argument.

Pleading tolling with particularity

A common failure mode in limitations responses is conclusory tolling allegations. "Plaintiff did not discover the injury until 2024" is not enough if the complaint elsewhere alleges facts that should have alerted a reasonable person to the injury earlier. "Defendant concealed the fraud" is not enough without specific acts of concealment.

The response brief should either:

1. Point to specific factual allegations in the complaint that plead the tolling elements with particularity. The judge needs to see the underlying facts, not just labels.

2. Seek leave to amend to add the necessary factual specificity. Most courts will grant leave at least once where amendment could cure a tolling deficiency. See Foman v. Davis, 371 U.S. 178, 182 (1962) (leave to amend should be "freely given when justice so requires").

A useful tactical move: in the response, attach a proposed amended complaint as an exhibit. This signals the court that any pleading defect is curable and makes dismissal with prejudice harder to justify.

How to structure the response brief

A clean limitations response has a predictable shape.

Introduction

State the doctrinal basis for the response in the first paragraph. "Defendant's motion ignores the discovery rule, which the complaint alleges shifted accrual to 2023, well within the limitations window. The motion further ignores the complaint's allegations of active concealment that toll the period regardless of accrual."

Statement of facts

Walk through the complaint's chronology with paragraph citations. Highlight every allegation relevant to accrual, discovery, concealment, or continuing conduct. This is where the response sets the factual frame the rest of the brief will use.

Legal standard

A short section explaining that limitations is an affirmative defense, that the defendant bears the burden, and that dismissal at the pleading stage requires the defense to be clear from the face of the complaint. Cite Jones v. Bock.

Argument

Organize by doctrine. For each tolling or accrual theory, state the elements, identify the complaint paragraphs that plead each element, and explain why the defendant's contrary reading is wrong. Lead with the strongest theory. If the discovery rule is your best argument, lead with it. If continuing wrong is the cleanest fit, lead with that.

Alternative request for leave to amend

A short section asking, in the alternative, for leave to amend to add additional facts supporting tolling. Identify what facts would be added. Attach a proposed amended complaint where practical.

Conclusion

Ask the court to deny the motion. Argue that any unresolved limitations question is factual and must be deferred to summary judgment.

Common pitfalls to avoid

Three recurring errors in limitations responses:

Conceding the accrual date. Defendants often state an accrual date in their opening brief and treat it as established. The response should never accept that framing without scrutiny. Identify the complaint's actual allegations about when the plaintiff knew or should have known of the injury and use those allegations to argue for a later accrual date.

Treating tolling as one-size-fits-all. Each tolling doctrine has its own elements. A response that argues "tolling applies" without identifying which doctrine and walking through its elements gives the court no doctrinal hook to deny the motion.

Forgetting to plead the factual basis for tolling. If the complaint does not allege the underlying facts, no amount of tolling argument in the brief will save it. The response brief either has the facts in the complaint or seeks leave to amend.

The bottom line

Limitations defenses can be devastating, but they are also more fragile than defendants often present them. The plaintiff's response wins when it: contests accrual using the complaint's own allegations, identifies the specific tolling doctrines that apply and pleads their elements, frames any disputed question as factual and unsuitable for 12(b)(6) resolution, and asks for leave to amend in the alternative. It fails when the response argues in generalities, concedes the defendant's accrual analysis without scrutiny, or treats tolling as a single undifferentiated argument.

The doctrine favors plaintiffs when the complaint plausibly alleges discovery within the limitations window, plausibly alleges concealment that tolls the period, or plausibly alleges continuing conduct that extends the actionable window. The job of the response brief is to make those plausibility showings concrete and to keep the case in court long enough to develop the factual record that limitations defenses ultimately turn on.