In a power of attorney, the principal is the person who grants legal authority over their own affairs, and the agent is the person who accepts that authority and uses it on the principal’s behalf. The relationship between principal and agent in a power of attorney is defined entirely by the document the principal signs: it names the agent, lists which decisions the agent can make, and sets the conditions under which that authority starts and ends. Once signed, the agent steps into a fiduciary role, meaning they are legally obligated to put the principal’s interests first in every action they take.
Who Can Be the Principal and Who Can Be the Agent
The principal is the one creating the document, and the only hard requirement is mental capacity at the moment of signing. Capacity here means you understand the nature of the document, recognize what property you own, and appreciate the consequences of letting someone else control your affairs. If a court later finds you lacked that capacity when you signed, the entire power of attorney is void. That’s why the time to sign one is while you’re healthy and clear-headed, not after a diagnosis has started to progress.
The agent, sometimes called an attorney-in-fact, does not need to be a lawyer despite the title. States generally require the agent to be a legal adult of sound mind, and after that the choice is the principal’s. Spouses, adult children, trusted friends, and professional fiduciaries are all common picks. The person you name will stand in your financial and legal shoes, so the choice deserves real thought. Whoever accepts has to be willing to take on the legal obligations the role carries.
What Authority the Principal Grants
The principal’s main job is to decide what the agent can do, when that authority starts, and how long it lasts. Those choices shape every later question about the agent’s role.
Durable or Non-Durable
A durable power of attorney stays in effect even if the principal later becomes mentally incapacitated. The document has to say so explicitly. A non-durable power of attorney terminates automatically the moment the principal loses the ability to make decisions. Because preparing for possible incapacity is one of the main reasons people sign these documents in the first place, the durable version is far more common. Most states will treat a document as non-durable by default if the durability language isn’t there.
General or Limited
A general power of attorney gives the agent broad authority over nearly all the principal’s financial and legal affairs, from bank accounts and investments to tax returns and real estate. A limited (or special) power of attorney narrows the agent’s authority to one specific task or category, such as signing closing documents on a particular property or managing a single brokerage account. The scope is whatever the document says it is, and nothing more.
Financial or Healthcare
A financial power of attorney and a healthcare power of attorney are separate documents covering different decisions. The financial version handles money, property, and business matters. The healthcare version, sometimes called a healthcare proxy or medical power of attorney, lets the agent talk to doctors and make medical decisions. You can name the same person for both or split the roles. A financial power of attorney alone won’t give an agent authority over treatment decisions, and the reverse is also true.
Immediate or Springing
An immediate power of attorney takes effect the moment the principal signs it. The agent can act right away, even while the principal is fully capable. A springing power of attorney only activates when a specific triggering event occurs, usually a physician’s written certification of incapacity. Springing documents sound appealing because they prevent premature use, but in practice they cause problems. Doctors are cautious about certifying incapacity, so getting the paperwork can take days. Banks and other institutions may refuse to honor the document until the trigger is beyond doubt. Disputes over whether the trigger has actually occurred can stall urgent decisions. Most estate planning professionals now recommend an immediate durable power of attorney with a well-chosen agent over a springing one.
The Agent’s Fiduciary Duties
Accepting the agent role is not a casual family favor. It imposes a fiduciary obligation, the most demanding standard of legal duty that exists. As a fiduciary, you have to put the principal’s interests ahead of your own in every decision, and that obligation is enforceable in court.
Loyalty
The duty of loyalty prohibits self-dealing. The agent cannot use the principal’s money to benefit themselves, lend themselves funds from the principal’s accounts, buy the principal’s property at a discount, or redirect business opportunities to their own ventures. Even transactions that look harmless can cross the line if the agent personally benefits. The safest working rule: any transaction where you appear on both sides is off limits unless the document specifically authorizes it.
Care
The duty of care requires the agent to manage the principal’s affairs with the same caution and diligence a reasonable person would use with their own money. If you have professional expertise in a relevant area, such as accounting or investment management, you’re held to the higher standard your skills make possible. Careless investment decisions, missed bill payments, or neglected property maintenance can all count as a breach.
Obedience
The agent’s authority comes from the document, and the document sets the boundaries. The duty of obedience means following the specific instructions and limitations the principal wrote in. If the document authorizes managing bank accounts but not selling real estate, selling the principal’s house exposes the agent to personal liability for any loss that results.
Record-Keeping
Agents must keep thorough, accurate records of every financial transaction. That means the amount, the date, the reason, and who was involved for each payment or deposit. Keep receipts for everything, including small purchases. Avoid paying for the principal’s expenses in cash when possible, and if you must, document exactly what the cash went to. If you reimburse yourself for out-of-pocket expenses, keep the original receipts along with a written record of what you paid, why, and when you repaid yourself.
Those records have to be ready to share. The principal, a court-appointed guardian or conservator, a personal representative of the principal’s estate after death, or a government agency investigating potential exploitation can all demand an accounting. Sloppy records are one of the fastest routes to a legal challenge, even when no money has actually been misused. Courts tend to view incomplete records with suspicion.
No Commingling of Funds
Never mix the principal’s money with your own. The principal’s funds must stay in accounts titled in the principal’s name, separate from the agent’s personal accounts. Commingling makes it nearly impossible to trace what belongs to whom, which is exactly why courts treat it as a serious breach. Depositing the principal’s Social Security check into your personal checking account “for convenience” already crosses the line. Violations can lead to civil suits for restitution, removal as agent, and in cases involving significant sums, criminal charges for embezzlement or theft. Courts can order the agent to repay lost funds along with interest and the principal’s legal fees.
Limits the Document Can’t Quietly Override
Even when a power of attorney grants wide authority, two areas trip up agents who assume the document covers everything.
Gifts and the Medicaid Look-Back
Some power of attorney documents give the agent authority to make gifts from the principal’s assets. This provision deserves extreme caution because of how it interacts with Medicaid. Federal law imposes a 60-month look-back period before a Medicaid application for long-term care. During that window, the state Medicaid agency reviews every asset transfer the applicant or their spouse made. If assets were given away or sold for less than fair market value, the applicant faces a penalty period of Medicaid ineligibility, calculated by dividing the total value of improper transfers by the average monthly cost of nursing home care in that state.1Office of the Law Revision Counsel. 42 USC 1396p – Liens, Adjustments and Recoveries, and Transfers of Assets There is no cap on how long that penalty period can last.
Here is the trap. The IRS allows individuals to gift up to $19,000 per recipient in 2026 without filing a gift tax return, but that tax exemption has no effect on Medicaid rules.2Internal Revenue Service. Gifts and Inheritances An agent who makes annual gifts to the principal’s grandchildren thinking the IRS exclusion protects them can inadvertently disqualify the principal from Medicaid coverage years later when nursing home care is needed. An agent with gifting authority should consult an elder law attorney before transferring any assets, especially if there’s any chance the principal may need long-term care within five years.
Tax Representation Before the IRS
A general power of attorney does not automatically let the agent deal with the IRS on the principal’s behalf. For an agent to represent the principal before the IRS or receive tax information, the principal has to file IRS Form 2848, Power of Attorney and Declaration of Representative, which names the specific individual and identifies the tax matters and years covered.3Internal Revenue Service. Topic No 311, Power of Attorney Information If the goal is only access to tax records without representation in disputes, Form 8821 (Tax Information Authorization) is the appropriate alternative.
Signing the actual tax return is more restricted still. Treasury regulations allow an agent to sign an income tax return in only three situations: the principal is unable to sign because of disease or injury, the principal has been continuously outside the United States for at least 60 days before the filing deadline, or the IRS grants specific permission for other good cause. The power of attorney must include specific language referencing the applicable Treasury regulation and stating the reason for the agent signing.4Internal Revenue Service. Instructions for Form 2848 Joint filers must each execute their own separate Form 2848.
Compensation and Reimbursement
Serving as an agent is real work. The power of attorney document itself is the primary authority on whether the agent gets paid and how compensation is calculated. If the document authorizes compensation, the agent is entitled to a reasonable fee for services performed. If the document is silent, agents should not set their own fees unilaterally. In most states, an agent who wants payment when the document doesn’t address it has to seek court approval.
Reasonable compensation depends on the actual services performed, not the size of the principal’s estate. What matters is the time spent, the complexity of the tasks, the level of responsibility involved, and the going rate for comparable fiduciary or administrative services locally. An agent managing a complex investment portfolio and coordinating with multiple financial institutions can justify a higher fee than one who pays a few monthly bills. Detailed time records help: what work was done, when, and how long it took.
Reimbursement for out-of-pocket expenses is separate from compensation. If the agent spends their own money on the principal’s behalf, including gas for trips to the bank, postage for legal mail, or filing fees, those reasonable costs can be reimbursed. Every expense needs a receipt and a note showing it served the principal’s interests. Blurring the line between compensation and reimbursement invites challenges from family members and courts reviewing the accounting later.
How the Relationship Ends
A power of attorney doesn’t last forever. Knowing when authority terminates keeps former agents from accidentally or deliberately overstepping.
Automatic Termination
The most straightforward trigger is the principal’s death. The moment the principal dies, the agent’s authority ends completely, and control over the principal’s affairs passes to the executor or personal representative of the estate. A non-durable power of attorney also terminates automatically if the principal loses mental capacity. Divorce can terminate the agent’s authority in states where the former spouse was named as agent, though the specific rules vary.
Revocation by the Principal
As long as the principal is mentally competent, they can revoke the power of attorney at any time. The standard process is to sign a written revocation and deliver it to the agent, in person or by mail. The principal should also notify every financial institution, government agency, and other third party that has a copy of the original document. Until a third party receives actual notice of the revocation, they can keep relying on the power of attorney in good faith, which means the former agent could still complete transactions institutions would honor. Prompt written notice to every relevant institution is how you actually shut down the former agent’s access.
Court-Appointed Guardianship
If a court finds that the principal can no longer manage their own affairs, it may appoint a guardian or conservator. A power of attorney is voluntary; a guardianship is court-ordered and takes away the principal’s legal right to make their own decisions. Because guardianships are court-supervised, they generally take precedence over a power of attorney when the two conflict. Courts often have authority to modify or terminate an existing power of attorney entirely, though some will respect a previously established document if the principal was competent when they signed it and the document adequately addresses current needs. One advantage of signing a durable power of attorney early is that it can reduce the likelihood of a guardianship proceeding in the first place.
Resignation and Post-Termination Liability
An agent can step down at any time by submitting a written resignation to the principal or a named successor agent. Once authority ends, by revocation, resignation, or any other event, the former agent has no legal right to access accounts or make decisions. A former agent who knowingly keeps acting after termination faces personal liability for any resulting harm. If a former agent acts in good faith without knowing the power of attorney has been revoked, most states will not hold them personally liable for transactions completed before they received notice. The same protection extends to third parties who honor the document before learning of the revocation.