The pros and cons of naming co-trustees come down to a trade: you gain shared oversight, complementary skills, and a built-in check against self-dealing, but you take on the risk of deadlock, higher administrative costs, and a legal duty for each trustee to monitor the other. Whether that trade works for your trust depends on the people you would name, how the trust document handles disagreement, and the size and complexity of the assets involved.
The Case for Co-Trustees
The strongest reason to name co-trustees is combining skills that no single person has. A family member understands the beneficiaries’ needs, personalities, and circumstances in a way no institution ever will. A corporate trustee brings professional investment management, regulatory compliance experience, and continuity that outlasts any individual. Pairing them gives the trust both perspectives without asking either to perform a role they are not equipped for.1
Co-trustees also create a natural check on each other’s conduct. With a single trustee, no one is watching the books in real time. A co-trustee arrangement means every significant decision gets a second set of eyes, which reduces the risk of self-dealing, negligent investment choices, or outright theft. For grantors who worry about giving one person unchecked control over substantial assets, this oversight function is often the primary motivation.
There is also an emotional dimension. When a grantor has two adult children and names only one as trustee, the other may feel slighted or suspicious. Naming both as co-trustees avoids that perceived favoritism. Whether it actually reduces family conflict depends on how well the siblings work together, but the gesture of equal authority carries weight.
The Case Against Co-Trustees
The day-to-day friction of co-trusteeship is where the arrangement most often breaks down. Two co-trustees with different investment philosophies can turn a simple portfolio rebalancing into a months-long negotiation. One trustee may want to hold concentrated stock positions for tax reasons while the other insists on diversification. Neither is necessarily wrong, but the trust cannot move until they agree.
Financial institutions add another layer. Banks typically require all co-trustees named on an account to sign off on certain transactions, regardless of what the trust document says about authority. Opening accounts, changing investments, or transferring funds may require coordinated signatures, which slows down routine operations. Co-trustees who live in different states or keep different schedules feel this constantly.
Costs climb too. Each co-trustee is generally entitled to reasonable compensation. When one of them is a corporate trustee, annual fees typically run between 1% and 1.5% of trust assets under management. A family member co-trustee may also take a fee, though many waive it. Beyond compensation, coordinating between co-trustees generates its own overhead: more phone calls with attorneys, more document review, more back-and-forth before decisions get made. For trusts with modest assets, the combined cost can outweigh the benefit.
Then there is personal liability. Every co-trustee independently owes the full fiduciary duties of loyalty, prudence, and impartiality to the beneficiaries. Those duties are not diluted by having a co-trustee. Under the Uniform Trust Code, a co-trustee who does not join in another co-trustee’s action is generally not liable for that action, but each co-trustee must exercise reasonable care to prevent a co-trustee from committing a serious breach of trust and to compel a co-trustee to fix one.1 Passive neglect is where co-trustees get into trouble. If one co-trustee embezzles funds and the other ignored warning signs or failed to review account statements, the passive co-trustee faces real liability for their own negligence in failing to act.
This can feel uncomfortable in practice. You are not just responsible for your own decisions. You have an affirmative obligation to monitor your co-trustee and intervene when something looks wrong. For a family member serving alongside a professional trustee, the standard is reasonableness, not forensic accounting: pay attention, ask questions, and act when something does not add up.
How Co-Trustees Actually Make Decisions
The trust document is the starting point. It can require unanimous consent, allow majority rule, or carve out specific powers for individual co-trustees. When the document is silent, the default in most states following the Uniform Trust Code is that co-trustees who cannot reach a unanimous decision may act by majority. That default matters more than people realize, because many trust documents say nothing specific about voting mechanics.
With exactly two co-trustees, the majority-rule default is essentially meaningless because there is no majority without unanimity. Every decision requires both to agree. This is the arrangement most likely to deadlock, and it is also the most common co-trustee setup in family trusts. When one trustee wants to sell real estate and the other refuses, administration stalls until they resolve the dispute or a court steps in.
Three or more co-trustees have a practical advantage: two out of three can move forward even if the third disagrees. A dissenting trustee who is outvoted and who documented the dissent at or before the time of the action is generally not liable for the majority’s decision, provided it does not amount to a serious breach of trust. That protection matters. A co-trustee can lose a vote without inheriting legal exposure for the outcome.
Limits on Handing Off Responsibility
Co-trustees cannot simply pass their responsibilities to one another. Under the Uniform Trust Code, a trustee may delegate certain functions to a co-trustee but cannot delegate any function the trust’s creator reasonably expected all trustees to perform together. Investment decisions, distribution choices, and other core management tasks typically fall into that category. Each co-trustee has a personal duty to participate, and checking out is not an option.
There is one narrow exception. If a co-trustee is unavailable due to illness, absence, or legal disqualification, and prompt action is needed to protect trust property, the remaining co-trustees can act without them. This prevents paralysis when one trustee is hospitalized or traveling, but it is not a workaround for a co-trustee who simply does not want to be involved.
Planning for Deadlock Before It Happens
Deadlock between two co-trustees is the single biggest operational risk, and a well-drafted trust document plans for it explicitly. The grantor who assumes their chosen co-trustees will always get along is the grantor whose trust ends up in court.
The most effective safeguard is naming a tie-breaking authority directly in the trust. This person, sometimes called a trust protector or trust director, has the power to cast a deciding vote or issue a binding directive when co-trustees are deadlocked. A trust protector who holds this limited power does not manage the trust day to day; they step in only when the co-trustees cannot resolve a specific disagreement. The document must explicitly grant the authority, because trust protectors have only the powers the document gives them.
An alternative is requiring co-trustees to use mediation or binding arbitration before petitioning a court. Mediation brings in a neutral third party who helps the trustees negotiate a resolution. Arbitration goes further and produces a binding decision. Either approach is faster and cheaper than litigation, but only works if the trust document mandates it. Without a mandatory dispute resolution clause, an angry co-trustee can go straight to court.
When the trust document provides no dispute resolution mechanism, any co-trustee or beneficiary can petition a court for instructions. A judge can order the trustees to take a specific action, modify the trust’s administrative terms, or remove a trustee. Court intervention is expensive, slow, and drains trust assets through legal fees. It is the option of last resort.
Alternatives That May Fit Better
Co-trusteeship is not the only way to get the benefits people associate with it. Before defaulting to co-trustees, consider whether a different structure achieves the same goals with less friction.
A single trustee paired with a trust protector can replicate the oversight benefit without requiring two people to agree on every decision. The trustee manages the trust independently while the trust protector holds specific powers, such as the ability to remove and replace the trustee, modify distribution provisions, or veto certain transactions. Under the Uniform Trust Code, a person who holds a power to direct trust actions is presumptively a fiduciary, which means they cannot exercise those powers carelessly.
A directed trust is another option. An investment advisor or distribution advisor directs the trustee on specific matters, and the trustee follows those directions as long as they do not constitute a serious breach of fiduciary duty. This separates investment management from administrative duties without creating the deadlock risk inherent in co-trusteeship.
A single family member trustee with access to professional advisors, paid from trust assets, may accomplish what many grantors want from a co-trustee arrangement: personal knowledge of the family plus competent financial management. The trustee hires and fires the advisors, avoiding the power-sharing conflicts that co-trustees face. The tradeoff is that the single trustee has final authority, which means less built-in oversight.
When Co-Trustees Make Sense
None of these structures is universally better than co-trustees. For large trusts with sophisticated assets and a family that communicates well, co-trustees can work beautifully, especially when one is a professional with investment expertise and the other knows the beneficiaries personally. The oversight is real, the skills are complementary, and the perceived fairness among family members has value in itself.
For smaller trusts, the math shifts. Trustee compensation and administrative overhead consume a larger share of a modest trust, and the benefits of dual oversight may not justify the drag. For families with a history of conflict, two co-trustees who dislike each other will not suddenly cooperate because the trust tells them to; the deadlock risk is close to a certainty, and a simpler structure will serve the beneficiaries better. The right answer depends on who you would name, how the document is drafted, and whether the trust is big enough to absorb the extra friction.