When a power of attorney names more than one agent, the principal has to decide whether those co-agents act jointly (every agent must agree and sign) or severally (any one agent can act alone). That choice controls how quickly decisions get made, how much oversight exists between the agents, and what happens when they disagree. In most states that have adopted the Uniform Power of Attorney Act, the default when the document is silent is several authority, meaning each co-agent can act independently without the other’s consent.1
What the Default Rule Says If You Don’t Specify
This is the single most important thing to understand before signing anything. If a power of attorney names two co-agents but says nothing about how they must act together, the rule in a majority of states is that each agent can act alone. The Uniform Power of Attorney Act, adopted in some form by most states, provides that unless the document says otherwise, each co-agent may exercise authority independently and the consent of all co-agents is not required for a transaction to be valid. Florida, West Virginia, and many other states follow this rule.
The logic is practical. Requiring unanimous agreement as a baseline would stall the principal’s affairs every time one agent was traveling, ill, or unreachable. Lawmakers chose independent authority as the default to keep things moving, and principals who want tighter controls have to opt into joint authority explicitly. If you want both agents to sign off on every decision, the document has to say so. Relying on the default to protect against a rogue agent is a mistake in most states.
Several Authority: Any One Agent Can Act Alone
When a power of attorney grants several authority, sometimes written as “jointly and severally” or “each agent may act independently,” a single agent can handle transactions without the other’s knowledge or approval. One agent can pay the mortgage, manage investment accounts, or sign medical release forms while the other is unavailable. Financial institutions will accept the signature of a single agent under several authority as long as the power of attorney is presented and verified.
That flexibility is the whole point. Several authority works well when the principal trusts both agents equally, when the agents live far apart, or when quick action may be needed on routine matters like paying bills or filing insurance claims. The tradeoff is obvious: less oversight. Either agent can move money or sign contracts without a second pair of eyes, which means the principal is relying entirely on each agent’s individual judgment and honesty.
Joint Authority: Every Agent Must Agree
Joint authority requires all named co-agents to agree on and participate in every transaction. No single agent can sell property, withdraw funds, or sign binding documents alone. Banks and title companies will require every agent’s signature before processing a transaction, and a deal can’t close until all agents have signed.
Principals choose joint authority as a deliberate safeguard. It prevents any one agent from making unilateral decisions about large financial matters, and it forces co-agents to communicate and reach consensus before acting. Families sometimes use this structure when the principal wants adult children to work together rather than operate in silos, or when the principal has concerns about one agent’s judgment but doesn’t want to exclude that agent entirely.
The downside is real. If one co-agent is unreachable, hospitalized, or simply uncooperative, the other agent’s hands are tied. Even urgent matters like paying property taxes before a deadline or authorizing emergency home repairs can stall. And if one co-agent dies or becomes incapacitated, the remaining agent may lose the ability to act at all unless the document addresses that scenario or names a successor. If you choose joint authority, build in contingency language for exactly these situations.
Majority Rule and Tie-Breakers for Three or More Agents
When a principal names three or more co-agents, the power of attorney can specify that a majority vote controls. This prevents a single dissenting agent from blocking decisions the others believe serve the principal’s interests. If two out of three agents agree on a course of action, that decision binds all three even if the third objects. The majority is typically calculated based on the number of agents currently authorized to act; agents who have died, resigned, or become incapacitated are excluded from the count.
For an even number of co-agents, the principal can designate a specific person as a tie-breaker. That person’s vote resolves any deadlock, and the decision becomes legally binding. Tie-breaker provisions are especially useful when a principal names two agents with equal authority but anticipates they may disagree on significant matters like whether to sell a family home or change investment strategies. Without a tie-breaker, an even split between agents under joint authority creates a stalemate that may require court intervention to resolve.
A Hybrid Approach for Mixed Situations
You don’t have to choose one model for everything. A common middle ground: grant several authority for routine matters below a specified dollar threshold and require joint authority for major transactions like selling real estate, changing beneficiaries, or making gifts. This gives agents flexibility for day-to-day management while preserving oversight where it matters most.
Several authority tends to fit best when the principal fully trusts each agent and values speed, such as paying bills, managing routine financial matters, or handling medical decisions when time is short. Joint authority fits when the principal wants a built-in check on large or irreversible decisions, or when the agents have complementary expertise and the principal wants both perspectives on every decision. A hybrid lets you draw the line where it actually matters for your estate.
What Happens When Co-Agents Disagree
Disagreements between co-agents are common, particularly when the principal is incapacitated and can’t weigh in. Under several authority, disagreements are less disruptive because each agent can still act, but they can create conflicting transactions or contradictory instructions to financial institutions. Under joint authority, a disagreement is an immediate roadblock.
The first step is checking the power of attorney itself. Well-drafted documents include dispute resolution procedures, such as requiring mediation or designating one agent’s authority as superior on specific matters. If the document doesn’t address disputes, the next option is state law. Under the Uniform Power of Attorney Act, a broad list of people can petition a court to interpret the power of attorney or review an agent’s conduct. That list includes the agents themselves, the principal’s spouse, parents, or descendants, healthcare decision-makers, government agencies, and anyone asked to accept the power of attorney.
A court can resolve the dispute, modify the agents’ authority, or remove an agent who is acting against the principal’s interests. If the principal still has capacity, the court must dismiss the petition if the principal asks; the principal always retains ultimate control. Court intervention is slow and expensive, which is why building dispute-resolution mechanisms into the original document saves families significant grief.
Planning for an Agent Who Can’t Continue
A well-drafted power of attorney anticipates that co-agents may not serve forever. An agent might resign, move away, become seriously ill, or die. The principal can designate one or more successor agents who step in when a predecessor can no longer serve. Unless the document says otherwise, a successor agent typically holds the same authority as the original.
Timing matters here, especially under joint authority. In most states following the Uniform Power of Attorney Act, a successor agent cannot act until all predecessor agents, including co-agents, have resigned, died, or become incapacitated. If one co-agent resigns but the other is still serving, the successor doesn’t automatically fill the empty seat. The remaining original agent continues alone under whatever authority structure the document specifies. Principals who want a successor to replace a departing co-agent, rather than waiting until all original agents are gone, need to say so explicitly.
A principal can also revoke one co-agent’s authority while leaving the other’s intact. This doesn’t require revoking the entire power of attorney. The revocation should be in writing, with copies going to the removed agent, the remaining agent, and any financial institutions or other third parties that have been dealing with the agents. Executing a new power of attorney does not automatically revoke a previous one unless the new document specifically says so.
Duties Every Co-Agent Carries, Whichever Structure You Pick
The joint-versus-several decision controls how authority is exercised, not whether agents are accountable. Every co-agent who accepts the role takes on fiduciary obligations to the principal, and those duties exist regardless of whether the agents act jointly or independently. They can’t be waived by the power of attorney.
At the core, each agent must act loyally in the principal’s best interest, in good faith and consistent with the principal’s known wishes, with the care and competence a reasonable person would use in similar circumstances, and must keep records of all receipts, disbursements, and transactions. Agents chosen for special expertise, such as a CPA handling finances, are held to a higher standard reflecting that expertise. Agents are also expected to preserve the principal’s estate plan to the extent they know it, which means not making gifts, retitling assets, or changing beneficiaries in ways that would disrupt the principal’s intended distribution.
Several authority creates one additional risk worth naming. Under the Uniform Power of Attorney Act, a co-agent who has actual knowledge that another agent is breaching or about to breach a fiduciary duty must take action: notify the principal, and if the principal is incapacitated, take whatever steps are reasonably appropriate to protect the principal, which might include contacting a court, an attorney, or adult protective services. An agent who knows about misconduct and does nothing can be held personally liable for the losses that could have been avoided. You’re not expected to audit every transaction your co-agent makes, but if you see unexplained withdrawals or know your co-agent is using the principal’s funds for personal expenses, looking the other way exposes you too.