Aiding and abetting a breach of fiduciary duty is a tort that holds a third party liable for knowingly and substantially helping a fiduciary violate their obligations, even though the third party owes no fiduciary duty of their own. The claim has three elements: an underlying breach of fiduciary duty by the fiduciary, the third party’s actual knowledge of that breach, and the third party’s substantial assistance in carrying it out. Most states recognize the cause of action, which is rooted in the Restatement (Second) of Torts ยง 876(b), though some jurisdictions have limited or declined to adopt it. The knowledge and assistance requirements set a high bar, and how each one is proven usually decides the case.
The Underlying Breach Has to Be Real
Every aiding and abetting claim depends on a fiduciary who actually breached a duty. If the primary fiduciary did nothing wrong, there is nothing for anyone else to have assisted. The breach can involve a duty of care, loyalty, or good faith, and it must cause identifiable harm to the person the fiduciary was supposed to protect. Common examples include a corporate director steering a deal to benefit themselves at the expense of shareholders, or a trustee misappropriating trust assets.
Once that underlying breach is on the table, the analysis turns to the outsider. Courts look at two things: what the defendant knew, and what the defendant did. Both must be proven. A defendant who knew about the breach but did nothing to help it along is not liable, and someone who unwittingly assisted a transaction that turned out to be harmful is not liable either. The claim lives at the intersection of awareness and action.
Proving Actual Knowledge
The knowledge element is where most aiding and abetting claims succeed or fail. Courts overwhelmingly require actual knowledge, meaning the defendant subjectively understood that the fiduciary was violating their duties. Constructive knowledge, the idea that the defendant “should have known” through reasonable diligence, is not enough. Allegations that a defendant “knew or should have known” about the breach are routinely rejected as insufficient to state a claim.
The defendant does not need to understand every legal nuance of fiduciary law, but they must grasp the wrongful nature of what the fiduciary is doing. Evidence typically comes from internal emails, meeting notes, deal memos, or direct communications showing that the defendant understood the fiduciary’s conduct was improper. A financial advisor who receives a letter from a board member warning that a proposed transaction violates the company’s interests, for example, would have a hard time claiming ignorance.
Willful Blindness as a Substitute
Some courts treat willful blindness as the functional equivalent of actual knowledge. Under this standard, a defendant who deliberately avoids learning about obvious wrongdoing can be treated as though they actually knew. Two conditions must be met: the defendant was aware of a high probability that the fiduciary was acting improperly, and the defendant consciously and deliberately avoided confirming that fact. Mere carelessness or negligence in failing to investigate does not qualify. The distinction prevents defendants from engineering their own ignorance by refusing to read documents or ask obvious questions while benefiting from the fiduciary’s misconduct.
What Falls Short
Suspicion alone is not enough. Encountering a few red flags during a complex transaction does not automatically mean a defendant knew about a breach. Sophisticated business dealings routinely involve unusual terms or structures that are perfectly legitimate. The line sits between a defendant who noticed something odd and moved on, and one who understood the fiduciary was betraying their principal and chose to participate anyway. Which side of that line a defendant sits on is often the single most contested issue in the case.
What Counts as Substantial Assistance
The defendant’s involvement must be more than incidental. Substantial assistance means the defendant actively contributed to the breach in a way that made a real difference. Courts look at whether the fiduciary could have pulled off the breach without the defendant’s help, what specific role the defendant played, and how closely the defendant’s actions were tied to the wrongful conduct rather than to legitimate business activity.
Concrete examples help mark the line. Preparing fraudulent documents, helping conceal the movement of assets, providing financing structured specifically to circumvent fiduciary obligations, or crafting a valuation designed to mislead a board of directors all constitute substantial assistance. On the other side, providing routine banking services, filing standard paperwork, or offering general business advice that happens to be used in furtherance of a breach typically does not meet the threshold. The question is whether the defendant’s contribution was specifically tailored to enable the improper conduct, or was simply a normal service that the fiduciary repurposed.
Encouragement counts too. A defendant who does not personally execute any part of the scheme, but actively urges the fiduciary to go through with it or provides reassurance that the plan will work, can be found to have provided substantial assistance. The Restatement (Second) of Torts recognizes that advice or encouragement operates as moral support to a wrongdoer, and if the encouraged act is known to be wrongful, the adviser bears the same liability as someone who physically participated.
Who Gets Sued
Certain professionals show up as defendants in these cases far more often than others, because their roles give them both the access and the technical capability to meaningfully assist a fiduciary’s misconduct.
- Investment banks and financial advisors who structure transactions, provide fairness opinions, and advise boards on major deals. In a well-known Delaware case, a financial advisory firm was held liable for aiding and abetting directors’ breaches even though the directors themselves were exculpated from personal liability under the company’s charter.
- Law firms that draft agreements, issue legal opinions, or structure transactions designed to circumvent fiduciary obligations.
- Accounting firms that help conceal financial irregularities, prepare misleading financial statements, or verify inflated valuations.
- Banks and lenders that process unusual transfers or provide financing for transactions clearly violating a client’s obligations.
- Corporate officers who help a director carry out a disloyal transaction. Officers owe their own fiduciary duties, but they can also face secondary liability for assisting a director’s separate breach.
These defendants are frequently targeted in part because they tend to carry professional liability insurance or hold substantial assets, making them viable sources of recovery when the fiduciary who committed the primary breach cannot satisfy a judgment alone.
Available Remedies
A successful claim opens up several categories of recovery. Compensatory damages cover the actual financial loss the plaintiff suffered as a result of the breach. In corporate cases, that might be the difference between the price shareholders received in a transaction and what they should have received absent the breach. In trust disputes, it could be the value of misappropriated assets plus lost investment returns.
Courts may also order disgorgement, requiring the third party to surrender any profits they earned from participating in the breach. That matters because advisors, banks, and attorneys often collect substantial fees for their role in the very transactions that harmed the plaintiff. Equitable remedies go beyond dollar amounts. A court can impose a constructive trust over specific assets obtained through the misconduct, effectively treating the defendant as holding those assets for the benefit of the injured party. Punitive damages may be available in cases of particularly egregious or intentional conduct, though many jurisdictions limit them or require a showing of malice or willful misconduct.
Whether the defendant faces joint and several liability alongside the primary fiduciary depends on the jurisdiction. Some states allow the plaintiff to collect the full judgment from either the fiduciary or the aider. Others allocate fault proportionally. In one notable case, a court assigned 83% of the damages to the financial advisor that aided and abetted the breach, reflecting the advisor’s outsized role in making the transaction happen.
Common Defenses
Defendants have several avenues to contest liability, and experienced defense counsel will typically raise more than one at once.
Lack of Knowledge
The most direct defense is that the defendant simply did not know the fiduciary was breaching their duties. Because actual knowledge is required, a defendant who can show they were unaware of the impropriety, or reasonably believed the transaction was legitimate, can defeat the claim. This defense works best when the defendant was not involved in designing the transaction and received no warnings or red flags suggesting misconduct.
No Substantial Assistance
Even if the defendant knew something was wrong, they can argue their involvement was too minor. Routine services that were not specifically tailored to enable the breach generally fall below the threshold. An accountant who prepared a standard tax return that happened to include improperly obtained income is in a different position than one who created shell entities to hide the fiduciary’s self-dealing.
In Pari Delicto
Translated roughly as “in equal fault,” this doctrine bars a plaintiff from recovering when they participated in the same wrongdoing they are complaining about. In corporate cases, courts sometimes apply agency principles to attribute the knowledge and misconduct of a company’s insiders to the company itself, which can bar the company from suing third parties who assisted the breach. If the company, through its agents, was an active participant in the scheme, it cannot turn around and seek damages from others who participated alongside it.
The defense has an important exception. When the insider completely abandoned the company’s interests, such as by outright looting or embezzling for purely personal gain, courts may refuse to impute that misconduct to the company. But this “adverse interest” exception is interpreted narrowly. If the company received any benefit from the insider’s scheme, even a short-term or incidental one, the exception typically does not apply. Some jurisdictions, notably Delaware for entities organized under its laws, also recognize a fiduciary duty exception that prevents in pari delicto from blocking core fiduciary claims.
Failure to State a Claim
Defendants frequently challenge these claims at the pleading stage, arguing that the complaint lacks the factual specificity needed to survive a motion to dismiss. Conclusory allegations about a defendant’s “awareness” or “participation” will not survive judicial scrutiny. The plaintiff must plead specific facts showing what the defendant knew and what they did to help.
Filing Deadlines and the Discovery Rule
The filing deadline generally tracks the statute of limitations for the underlying breach of fiduciary duty. That period varies by jurisdiction but commonly falls between three and six years. Some states apply a shorter period when the breach involves fraudulent conduct and a longer one for non-fraudulent breaches. Under federal law, ERISA fiduciary breach claims carry a six-year limitations period, with an extension for fraud or concealment that runs six years from the date of discovery.
The discovery rule matters here because fiduciary breaches are often concealed by the very people who committed them. Under this rule, the limitations clock does not start until the plaintiff discovers, or reasonably should have discovered, the breach. Courts look at when the plaintiff first encountered facts sufficient to arouse the suspicions of a reasonable person. Once that threshold is crossed, the plaintiff has a duty to investigate rather than wait for the full picture to emerge.
Fraudulent concealment can extend the deadline further, but only if the plaintiff did not yet have enough information to suspect wrongdoing. If the plaintiff already had reason to be suspicious and knew they had been harmed, active concealment by the defendant does not reset the clock. Plaintiffs also have to plead the specific circumstances of discovery, including the timeline and what triggered their awareness, so the court can evaluate whether the claim was filed in time.
The Federal Securities Boundary
If the dispute involves securities fraud rather than a common-law fiduciary breach, the rules change. In Central Bank of Denver v. First Interstate Bank of Denver (1994), the Supreme Court held that there is no private right of action for aiding and abetting under the federal securities laws. Individual investors cannot sue third parties for aiding and abetting securities fraud in federal court. The Dodd-Frank Act later gave the SEC enforcement authority to pursue aiders and abettors, but that power belongs to the agency, not to private plaintiffs. State common-law aiding and abetting claims remain available alongside or as alternatives to federal securities claims, which is one reason these state-law theories continue to be actively litigated even in cases with a strong securities-fraud flavor.
How It Differs From Civil Conspiracy
Aiding and abetting and civil conspiracy are often pleaded together, but they work differently. The central distinction is the agreement requirement. Civil conspiracy requires proof that two or more people agreed to participate in wrongful conduct. Aiding and abetting requires no such agreement. Instead, it focuses on whether the defendant knowingly gave substantial assistance to someone else’s wrongful act.
The difference has practical consequences. A conspiracy claim can reach defendants far removed from the actual harm, as long as they were part of the agreement. An aiding and abetting claim demands closer involvement, since the defendant must have actually done something to help the breach along. On the other hand, aiding and abetting does not require the plaintiff to prove a meeting of the minds. And under conspiracy liability, each conspirator is liable for the acts of every other conspirator within the scope of the agreement. Under aiding and abetting, the primary fiduciary is not automatically liable for the independent wrongs of the aider unless a conspiracy is also proven.