A power of attorney lets one person act on behalf of another, but only within the scope the document sets
A power of attorney is a legal document that gives another person — called the agent or attorney-in-fact — the authority to make decisions or sign documents on your behalf. The person who grants this authority is called the principal. The agent does not need to be a lawyer; they can be a family member, friend, or professional fiduciary.
The agent's powers are limited to exactly what the document says they can do. If the document says the agent can pay bills and manage bank accounts, they cannot sell your house or make medical decisions unless those powers are also written in. The document itself is the boundary. Once you sign it and have it notarized (in most states), it takes effect when ready — unless you specify a later date — and remains in effect until you revoke it, you die, or the document itself says it expires.
The agent must act in your best interest and keep records of what they do with your money or property. They cannot use your assets for themselves, cannot change the document, and cannot delegate their authority to someone else unless the document explicitly allows it. If they violate these duties, you or your heirs can sue them.
Key Takeaways
- A power of attorney document must specify exactly which powers the agent has — paying bills, managing investments, selling property, or making medical decisions — and the agent can only do what is written.
- The document takes effect when you sign and have it notarized, unless you write a future date into it, and it stays in effect until you revoke it, die, or the document expires on its own terms.
- The agent must act in your interest, keep records, and cannot use your assets for themselves; violating these duties can result in a lawsuit against them.
- A durable power of attorney remains valid even if you become mentally incapacitated, while a regular one ends if you lose capacity unless it is also marked durable.
The difference between durable and non-durable powers of attorney
A durable power of attorney stays in effect even if you become mentally incapacitated or unable to make decisions. A non-durable power of attorney ends automatically if you lose capacity. Most people choose durable because the whole point of naming an agent is to have someone act for you if you cannot — whether that is because of illness, injury, or cognitive decline.
To make a power of attorney durable, the document must include specific language stating that it survives your incapacity. The exact wording varies by state, but it typically says something like "This power of attorney shall not be affected by the principal's subsequent incapacity." Without that language, the document is non-durable by default in most states, and it becomes worthless the moment you cannot sign your name or understand what you are signing.
You can also create a springing power of attorney, which does not take effect until a specific event happens — usually your incapacity. A doctor's letter confirming you cannot manage your affairs might be the trigger. Springing powers are less common because they create delays and disputes: banks and other institutions sometimes refuse to honor them because proving the trigger event happened can be difficult and time-consuming.
What powers you can and cannot grant
You can grant broad powers or narrow ones, depending on what you need. Common powers include paying bills, managing bank accounts, buying or selling property, managing investments, filing taxes, and making gifts. Some documents let the agent do all of these; others limit the agent to one or two specific tasks.
You cannot grant power over medical decisions through a regular power of attorney. Medical decisions require a separate document called a healthcare power of attorney, healthcare proxy, or medical power of attorney — the name varies by state. This document lets your agent make decisions about surgery, medication, life support, and other medical care if you cannot. It is a different legal instrument with different rules.
You also cannot use a power of attorney to change your will, create a new will, or revoke an old one. The agent has no authority over your estate planning documents themselves. If you want someone to manage your property during your lifetime but you want a different person or arrangement to take over after you die, you need both a power of attorney and a will or trust.
How the agent actually uses the power of attorney
When the agent needs to act, they present the original signed power of attorney document to whoever they are dealing with — a bank, a real estate agent, a government office, or a business. The institution reviews the document to confirm the agent has the authority to do what they are asking. Some institutions have their own power of attorney forms they prefer; if so, you may need to sign their version in addition to your own, or the agent may need to get a certified copy of your document.
Banks and title companies are often slow to accept powers of attorney because they worry about fraud or the document being revoked without their knowledge. The agent may need to provide a certified copy from the county clerk, a notarized statement that the document is still in effect, or a letter from an attorney confirming the document's validity. This can take weeks, so if you need the agent to act quickly, tell them in advance and ask the institution what paperwork they need.
The agent must keep records of everything they do — deposits, withdrawals, purchases, sales, and gifts. If you are still alive and capable, you can review these records anytime. If you die or become incapacitated, your heirs or a court may ask to see the records to confirm the agent acted properly. An agent who cannot produce records or who has spent your money on themselves is at risk of being sued.
When a power of attorney ends
A power of attorney ends in several ways. You can revoke it anytime by signing a revocation document and giving copies to your agent and to any institution that has a copy of the original. You can also create a new power of attorney that explicitly revokes the old one. If you die, the power of attorney ends when ready — the agent has no authority over your estate after death, and your will or trust takes over instead.
If the document includes an expiration date, it ends on that date unless you renew it. Some people set expiration dates of five or ten years to force a review and update. If there is no expiration date and the power of attorney is durable, it stays in effect for your entire life unless you revoke it.
If you become incapacitated and the power of attorney is not durable, it ends automatically. At that point, if no one has authority to manage your affairs, a family member or friend may need to go to court and ask to be appointed as your guardian or conservator. This is more expensive and more restrictive than a power of attorney, so naming a durable agent in advance is usually the better path.
Who can be your agent and what to look for
Your agent can be anyone you trust — a spouse, adult child, sibling, friend, or professional such as an accountant or attorney. You can name more than one agent, either to act together (both must agree and sign) or separately (each can act alone). You can also name alternate agents who take over if your first choice cannot or will not serve.
Choose someone who is organized, honest, and willing to keep records. Choose someone who will not disappear or ignore your wishes. If you name a family member and family relationships are strained, the agent may face pressure or conflict. A professional fiduciary — someone licensed to manage other people's affairs — costs money but removes family drama and provides accountability.
Tell your agent what you expect. Walk them through your finances, your property, your debts, and your values. If you have strong feelings about gifts, charitable giving, or how money should be spent, put those in writing or discuss them clearly. The agent is legally required to act in your best interest, but knowing your preferences in advance prevents misunderstandings and makes their job easier.
State-by-state differences in power of attorney law
Power of attorney law varies significantly by state. Some states require the document to be notarized; others do not. Some states have their own statutory form that is widely accepted by banks and institutions; others do not. Some states allow agents to make gifts; others restrict it. Some states let you name an agent to make healthcare decisions in the same document; others require a separate healthcare proxy.
If you own property in more than one state, you may need separate powers of attorney for each state, or you may need to have your document certified or re-notarized in the other state. If you move to a new state, your old power of attorney may still be valid, but it is worth having an attorney in your new state review it to confirm it meets local requirements.
Because the rules are different everywhere, it is worth consulting a local attorney before you sign, especially if your situation is complex — if you own real estate, have significant assets, or have a blended family. An attorney can make sure your document is valid in your state and covers what you actually need.
Frequently Asked Questions
Can my agent use my money to pay themselves?
No, unless the power of attorney document explicitly allows it. Even then, the agent can only take reasonable compensation for their work — they cannot take large sums or use your money for personal expenses. If they do, you or your heirs can sue them for breach of fiduciary duty and force them to repay what they took.
What happens if my agent dies or becomes unable to serve?
If you named an alternate agent in the document, that person takes over automatically. If you did not name an alternate and your agent dies or refuses to serve, the power of attorney is no longer valid. You would need to sign a new one naming a new agent, or if you are incapacitated, a family member would need to go to court to become your guardian.
Can I have a power of attorney and a will at the same time?
Yes. A power of attorney controls your affairs while you are alive; a will controls what happens to your property after you die. They serve different purposes and work together. Your agent under the power of attorney has no authority after you die — your executor (named in your will) or your trustee (if you have a trust) takes over then.
Do banks have to accept my power of attorney?
Banks can refuse a power of attorney if they believe it is invalid, forged, or revoked. Most banks accept documents that are notarized and clearly written, but some have their own forms they prefer. If a bank refuses your document, you can ask why, provide additional proof (like a certified copy or an attorney's letter), or switch banks. Persistent refusal is rare.
What if I want to revoke my power of attorney?
Sign a revocation document, have it notarized, and give copies to your agent and to any institution that has a copy of the original power of attorney. Tell your agent in writing that they no longer have authority. If your agent has already acted on the power of attorney, the revocation does not undo what they did — it only stops them from acting going forward.