A power of attorney is a legal document that lets one person make decisions or sign documents on behalf of another

A power of attorney is a written agreement where you (the principal) give another person (the agent or attorney-in-fact) the legal authority to act for you. The agent can sign documents, make financial decisions, handle property, or manage medical choices—depending on what you write into the document. You stay in control: you decide exactly what powers the agent has, when those powers start, and when they end.

The agent is not a lawyer, despite the name "attorney-in-fact." They are straightforward someone you trust to handle your affairs. The document itself is what gives them the legal right to act. Without it, a bank will not let your adult child access your account, a hospital will not let your spouse make medical decisions if you cannot, and a landlord will not let anyone else sign a lease on your behalf.

Key Takeaways

  • A power of attorney is a document you create that gives another person legal authority to act or sign on your behalf in specific areas.
  • You decide what powers the agent has—financial only, medical only, or both—and the document must be signed and often notarized to be valid.
  • A durable power of attorney stays in effect even if you become mentally incapacitated, while a regular one ends if you lose capacity.
  • The agent has a legal duty to act in your best interest and keep records of what they do with your money or property.
  • You can revoke a power of attorney at any time while you are mentally able to do so, and it automatically ends when you die.

The difference between financial and medical powers of attorney

A financial power of attorney lets your agent handle money and property matters: pay bills, deposit checks, sell a house, manage investments, or file taxes. A medical power of attorney (also called a healthcare proxy or healthcare power of attorney) lets your agent make medical decisions if you cannot—choosing doctors, approving surgery, deciding on end-of-life care. Some people create both documents; others create only one.

The scope matters. You can write a financial power of attorney that covers only bank accounts, or one that covers everything. You can give your agent power to sell your house but not to change your will. You can make a medical power of attorney that covers all healthcare decisions or one that covers only specific situations. The more specific you are, the clearer your wishes are and the fewer questions your agent will face.

Durable versus non-durable powers of attorney

A durable power of attorney stays in effect even if you become mentally incapacitated—unable to make decisions yourself due to illness, injury, or age. A non-durable power of attorney ends automatically if you lose mental capacity. Most people choose durable because the whole point is to have someone act for you if you cannot.

If you do not specify "durable" in the document, many states treat it as non-durable by default. Check your state's rules or work with a lawyer to make sure the document says what you intend. A durable power of attorney is especially important if you are worried about future incapacity—it prevents your family from having to go to court and ask a judge to appoint a guardian, which is slower and more expensive.

What your agent can and cannot do

Your agent can only do what the document allows. If you give them financial power of attorney, they cannot make medical decisions. If you limit their power to "pay household bills," they cannot sell your house. If you say the power ends on a specific date, it ends on that date even if you are still alive and able to use it.

Your agent cannot change your will, make gifts to themselves (unless you explicitly allow it), or act after you die. They also cannot act before the power of attorney takes effect—some documents say "effective when ready" and others say "effective only if I become incapacitated" (called a springing power of attorney). Your agent has a legal duty to act honestly, keep records, and use your money only for your benefit, not their own. If they break that duty, you or your heirs can sue them.

How to create a power of attorney

You can write a power of attorney yourself using a template, buy a form from an office supply store, or work with a lawyer. The document must be in writing and signed by you in front of a notary public in most states. Some states also require witnesses. If you do not follow your state's rules, the document may not be valid, and banks or hospitals may refuse to honor it.

A lawyer can cost $200 to $1,000 depending on how complex your situation is and where you live. A notarized template or form costs $20 to $100. If your finances are straightforward and you know exactly what you want, a template may be enough. If you have a business, rental property, investments, or complicated family situations, a lawyer can help you avoid mistakes that could cost thousands later.

Keep the original signed, notarized document in a safe place—a safe deposit box, a fireproof safe at home, or with your lawyer. Give copies to your agent, your bank, your doctor's office, and anyone else who might need to see it. Tell your agent where the original is kept and what your wishes are.

When a power of attorney ends

A power of attorney ends when you die, when you revoke it in writing, when the date you set expires, or when the condition you set (like "if I become incapacitated") no longer applies. You can revoke it at any time while you are mentally able to do so—just sign a revocation document, have it notarized, and give copies to your agent and anyone who has a copy of the original.

If your agent dies or becomes unable to act, the power of attorney does not automatically transfer to someone else. You would need to create a new one naming a different agent. Some people name a backup agent in the original document so there is no gap.

Common mistakes to avoid

Do not name someone as your agent unless you trust them completely and have talked to them about it first. Many people assume a family member will say yes, only to find out later that the person does not want the responsibility or is not available when needed. Have the conversation before you sign.

Do not be too vague about what powers you are giving. "Handle my finances" is less clear than "pay bills, manage my bank accounts, and sell my house if needed." The more specific you are, the fewer questions will come up and the easier it is for your agent to act.

Do not forget to tell people where the document is. If your agent does not know where to find it, or if your family does not know your agent exists, the document is useless. Write down where the original is kept and give that information to your agent and a trusted family member.

Do not assume a power of attorney from another state is valid in your state. Some states accept out-of-state documents; others do not. If you move or your agent lives in a different state, check whether you need a new document.

Frequently Asked Questions

Can I name more than one person as my agent?

Yes, you can name co-agents who act together, or you can name a primary agent and one or more backup agents who step in if the primary agent cannot or will not act. Co-agents must agree on decisions, which can slow things down. Most people choose one primary agent and one backup.

What happens if my agent spends my money on themselves?

Your agent has a legal duty to use your money only for your benefit. If they steal or misuse it, you or your heirs can sue them for the money back plus damages. Keep records of what your agent does—ask them for receipts and account statements regularly—so you can catch problems early.

Does my agent need to tell me what they are doing?

That depends on your state and what the document says. Some states require agents to keep records and report to you; others do not. You can write into the document that your agent must give you regular updates. If you become incapacitated, your agent may not be able to report to you, but they should keep detailed records for your heirs or a court if needed.

Can I have a power of attorney if I am on Social Security or Medicaid?

Yes. A power of attorney does not affect your benefits. However, if your agent spends your money in certain ways, it could change how much Medicaid you receive. Talk to a lawyer or your local Medicaid office before giving your agent broad spending power if you receive means-tested benefits.

What is the difference between a power of attorney and a will?

A power of attorney lets someone act for you while you are alive. A will tells people what to do with your property after you die. You need both: the power of attorney handles your affairs if you become incapacitated, and the will handles what happens to your estate after you pass away.