Trustee Duty of Care: Prudent Person Standard and Breach Remedies

The trustee duty of care, often called the prudent person standard, requires anyone managing a trust to invest and administer its assets the way a reasonably careful person would in the same circumstances, taking into account the trust’s purposes, terms, and beneficiaries. Under the Uniform Prudent Investor Act, adopted in nearly every U.S. jurisdiction, courts judge a trustee on process and judgment rather than on whether a particular investment made or lost money.¹ Fall short of that process, and the trustee can be personally liable for losses.

What the Standard Actually Requires

The rule is objective. The question is never whether the trustee believed they were doing their best, but whether a reasonable person with ordinary financial knowledge would have made the same choices on the same facts.

Three qualities have to show up together: care, skill, and caution. Care means paying attention to what is happening with trust property. Skill means possessing, or obtaining, the financial knowledge needed to make informed decisions. Caution means not gambling with someone else’s money. A trustee who lacks investment expertise does not get a pass for ignorance. The law expects them to develop the knowledge or hire someone who already has it.

One detail catches individual trustees off guard: the standard also requires a reasonable effort to verify facts before acting on them.¹ Acting on a friend’s stock tip or assuming real estate will appreciate without checking the local market is a shortcut that can create personal liability.

The line courts draw is simple to state and harder to live with. A well-researched investment that loses value in a downturn is not a breach. Failing to research the investment at all, or ignoring risks that were knowable at the time, is a breach even if the market happens to recover. Compliance is judged on the facts available at the time of the decision, not with hindsight.

A Higher Bar for Professional Trustees

A bank, trust company, or financial advisor serving as trustee is held to a stricter standard than a family member stepping into the role. A trustee who has special skills, or who was appointed because they claimed to have those skills, has a duty to actually use them.¹ A corporate trustee that manages hundreds of trust accounts cannot defend itself by saying it acted like an ordinary person. The court will ask whether it acted like a professional investment manager.

So a family member who makes a naive mistake may receive more leeway than a professional who should have known better. If a trust company advertises its expertise as the reason it should be appointed, the law takes it at its word.

How the Standard Applies to Investments

Older law restricted trustees to a “legal list” of approved investments, mostly government bonds and certain mortgages. The UPIA dismantled that approach. A trustee can now invest in any kind of property or investment type, provided the overall strategy fits the prudent investor standard.¹ Stocks, mutual funds, real estate, and other asset classes are all permissible if they fit the trust’s risk profile.

Individual investments are no longer judged in isolation. A volatile stock that would look reckless on its own may be perfectly appropriate as a small slice of a balanced portfolio. Courts look at whether the trustee’s overall strategy had risk and return objectives suited to the trust.¹

When building and adjusting a portfolio, a trustee is expected to weigh several factors tied to the trust and its beneficiaries:

General economic conditions, including interest rates and market trends
Inflation risk, so the portfolio maintains purchasing power rather than just nominal value
Tax consequences of investment decisions and their timing
Other resources the beneficiaries have outside the trust
Liquidity needs for upcoming distributions or expenses
Assets with special value to the trust’s purposes or to a beneficiary, such as a family business or a home

The list is not exhaustive, but it reflects what courts look for when evaluating prudence.¹

Diversification Is the Default

A trustee must diversify trust investments unless there is a specific reason not to. The UPIA treats diversification as a default obligation: diversify unless the trustee reasonably determines that special circumstances mean the trust’s purposes are better served without it.¹ Concentrating assets in a single company, industry, or asset type leaves the entire estate exposed to one bad outcome.

Special circumstances that might justify a concentrated position include a family business the trust was designed to hold, real estate named in the trust document, or tax consequences so severe that selling would hurt beneficiaries more than the concentration risk. The trustee bears the burden of documenting why diversification was not appropriate. “I thought the stock would keep going up” does not qualify.

Delegating When You Lack Expertise

A trustee who lacks investment expertise is not expected to run a portfolio alone. The UPIA explicitly permits a trustee to delegate investment and management functions to a qualified agent, and a trustee who delegates properly is not liable for the agent’s decisions.

Proper delegation has three parts. First, careful selection: the trustee must use reasonable care in choosing a qualified agent, such as a registered investment advisor or professional money manager. Second, clear terms: the delegation agreement must define the agent’s authority, investment guidelines, and reporting obligations consistent with the trust’s purposes. Third, ongoing monitoring: the trustee must periodically review the agent’s performance to make sure the agent is sticking to the agreement.¹

Delegation is not abdication. A trustee who hires an advisor and never checks in again has failed the monitoring requirement and stays on the hook for losses. The agent, for their part, owes a duty to the trust to follow the terms of the delegation.

The Duty Runs Continuously

The duty of care does not end once a trustee sets up an investment strategy. It runs for the entire life of the trust. A trustee must regularly review portfolio performance, reassess whether the risk level still fits the beneficiaries’ needs, and adjust when circumstances change. A strategy that was prudent five years ago may no longer be appropriate after a beneficiary retires, a child reaches adulthood, or economic conditions shift.

In practice, this means reviewing quarterly statements, evaluating the performance and fees of any hired advisors, and keeping trust expenses reasonable. Documenting those reviews matters. If a beneficiary later challenges management, the records are evidence that the trustee followed a disciplined process. During periods of market volatility, courts care far more about whether the process was sound than about whether the portfolio lost value.

What a Breach Costs the Trustee

A breach of the duty of care happens when the trustee fails to follow the process a prudent person would have used. Beneficiaries who prove a breach have several remedies under the Uniform Trust Code:

Surcharge, meaning the trustee must personally repay the trust for losses caused by the breach, including income or growth the trust would have earned under proper management
Removal, with a court appointing a replacement trustee
Voiding improper transactions, including liens or constructive trusts on wrongfully transferred property
Reduction or denial of the trustee’s compensation
Compelled performance, where a court orders the trustee to complete specific tasks such as filing an accounting or making required distributions

Limits on Exculpatory Clauses

Some trust documents include exculpatory clauses that try to limit the trustee’s liability for mistakes. Those clauses have real limits. Under the Uniform Trust Code, an exculpatory clause is unenforceable if it purports to shield the trustee from liability for actions taken in bad faith or with reckless indifference to the beneficiaries’ interests. State variations exist. Some states draw the line at willful misconduct, others at failure to exercise reasonable care. No jurisdiction allows a trust document to give a trustee blanket immunity for intentional wrongdoing or gross negligence.

Beneficiary Consent

A trustee is generally not liable for a breach if the affected beneficiary consented to the conduct, ratified the transaction, or released the trustee. The defense fails if the trustee used improper conduct to obtain the consent, or if the beneficiary did not know their rights or the material facts when they agreed. A trustee who pressures a beneficiary into signing a release, or who omits key information before asking for approval, cannot later hide behind that document.

Time Limits on Claims

Beneficiaries cannot wait indefinitely. Under the Uniform Trust Code, once a trustee sends a report that adequately discloses a potential breach and includes notice of the time limit for legal action, a beneficiary has a limited window to sue. The specific period varies by state, but commonly runs from six months to one year after the beneficiary receives the report. If the trustee never provides adequate disclosure, a longer fallback period applies, typically measured from the trustee’s removal, death, or the trust’s termination.

That creates a practical incentive for trustees to provide thorough, transparent accountings. Detailed reports that clearly disclose investment decisions, fees, and distributions start the clock running. Vague reports do not, which means a trustee who hides information may face claims years later.

1
National Conference of Commissioners on Uniform State Laws. Uniform Prudent Investor Act (UPIA) of 1994