Power of Attorney, Explained

A power of attorney, or POA, is a legal document that lets someone else act on your behalf.^[1] You are the principal. The person you name is your agent, called an attorney-in-fact in some states. The agent does not have to be a lawyer, and usually is not. Most people name a spouse, an adult child, or a sibling.

The document works only while you are alive. That single fact confuses more people than anything else about POAs. Searches for "power of attorney after death" outnumber almost every other POA question, and the answer is always no. The moment you die, the document is void, and the executor named in your will takes over through probate. We wrote about that half separately: your power of attorney dies when you do. This story is about the living half, which is the half that actually protects you.

So what does a power of attorney do? While you are alive, it lets your agent pay your bills, sell your property, file your taxes, and handle business when you cannot or do not want to.^[1] If a stroke, dementia, or a long hospitalization takes you out of commission, the agent is the person who keeps your financial life running. That is real power, and the Consumer Financial Protection Bureau describes it without decoration: a POA "gives someone else a great deal of authority over your finances without regular oversight."^[1] Choose the person accordingly.

A plain, nondurable power of attorney has a built-in failure. It stops working the moment you become incapacitated.^[3] That is exactly the moment most people need it. Estate law developed two fixes, and one works far better than the other.

Durable means the document survives your incapacity. If dementia or a coma takes your capacity, your agent keeps paying the mortgage, managing investments, and filing tax returns.^[3] In the roughly 31 states plus D.C. that have adopted the Uniform Power of Attorney Act, approved by the Uniform Law Commission in 2006, a power of attorney is presumed durable unless the document says otherwise.^[2][8] In the remaining states, the document must state that it survives incapacity, or it will not.^[3]

Springing means the document sits dormant until you become incapacitated, then springs into effect. It sounds safer. You keep full control until you actually lose it. In practice it usually backfires, for one structural reason: someone has to prove you are incapacitated before the document works.

• Most springing POAs require one or two physicians to certify that you can no longer manage your affairs. Doctors are often reluctant to make that call, especially when a condition fluctuates.^[3]
• HIPAA can block providers from sharing the certification, or the medical records behind it, with your agent unless you signed a separate HIPAA authorization while you were still competent.^[3]
• Every institution holding your money must accept the incapacity paperwork before it lets your agent act. Each round of scrutiny adds days or weeks during which nobody can pay your bills.

This is why many attorneys steer clients toward immediately effective durable documents instead.^[3] The honest version of the choice is this: if you do not trust your agent with authority today, the fix is a different agent, not a springing clause.

"Power of attorney" without a modifier usually means the financial kind: money, property, taxes, accounts. There is a second document for your body.

A medical power of attorney, also called a health care proxy or durable power of attorney for health care, names a health care agent: "someone you choose to make health care decisions for you when you cannot."^[4] Unlike a financial agent, whose authority can start the day you sign, a health care agent acts only when you cannot decide for yourself.^[4] In most states that agent can choose or refuse life-sustaining treatment, agree to treatment and then stop it if you do not improve, access and release your medical records, and authorize organ donation unless you stated otherwise.^[4]

The two documents do not overlap. "Your health care agent has no control over your money."^[4] Your financial agent has no say over your treatment. You can give both jobs to the same person or split them, and splitting is often the smarter call. The child who is good with money is not always the one who can stand in an ICU and refuse a ventilator on your behalf.

The medical POA usually lives inside an advance directive, next to a living will that records your treatment wishes in your own words. We cover the whole package in our advance directive guide, and our advance directive tool walks you through your state's form.

What can a power of attorney do? Exactly what the document grants, and nothing more. Statutory forms list categories of authority, such as real estate, banking, taxes, and retirement accounts, and you initial only the powers you want to hand over.^[2] You can grant everything, or you can grant one narrow task, like signing the closing papers on a single house sale. Both are valid powers of attorney.

Whatever you grant, your agent takes it as a fiduciary. Under the Uniform Power of Attorney Act, power of attorney duties include acting in good faith, staying within the granted authority, following your known wishes, and keeping records.^[2] An agent who violates those duties is liable for what your estate lost, not merely for what the agent gained.^[2]

The hard limits hold no matter how broadly the document is written:

• No self-dealing. Your money never becomes the agent's money. The CFPB lists spending the principal's funds on themselves and making unauthorized gifts as textbook misuse.^[1]
• No beneficiary games. Changing the beneficiaries on your insurance or retirement plans without authorization is abuse, not administration.^[1]
• No touching your will. An agent cannot make, change, or revoke your will. A will requires your own intent and your own signature in front of witnesses, and no one can supply either for you. A POA clause claiming to allow it is invalid.^[5]

One caveat on that last point. An agent cannot rewrite your will, but an agent's financial decisions can still reshape what your heirs receive. Selling the house your will leaves to your son, or draining an account to pay for your care, changes inheritance outcomes without touching the document itself.^[5]

A power of attorney is one of the cheapest documents in estate planning and one of the most consequential. There are two routes.

The free route. Many states publish free statutory POA forms, fill-in-the-blank documents written directly into state law.^[6] Online form services sell the same outcome with more hand-holding for $35 to $150.^[6]

Execution. A signature alone is not enough. Nearly every state requires notarization, and many also require witnesses; Florida and New York demand both.^[3][6] Standard notary fees run about $5 per notarial act, with state caps between $2 and $25.^[6] A mobile notary who comes to a home or hospital adds $25 to $100.^[6] Total for the free-form route: under $30.^[6]

The attorney route. A lawyer-drafted power of attorney typically costs a flat $200 to $500 per document, with the average around $380.^[6][7] Packages that bundle a POA with a will and health care documents run $500 to $1,000.^[7] Pay for the lawyer when anything about your situation is complicated: a business, property in more than one state, a blended family, or an agent choice your siblings will fight about.

Whichever route you take, make copies. Give one to your agent and put another where the person handling an emergency can actually find it. A flawless POA locked in a safe deposit box that only you can open protects no one.

Every power of attorney carries the same final expiration date: your death. The document ends immediately when you die, and an agent who keeps signing after learning of your death is acting without authority.^[2] It does not matter that your daughter held the POA for ten years. At death, authority moves to the executor named in your will, through probate. The full explanation is here: Your Power of Attorney Dies When You Do.

A POA also ends when:

• You revoke it. That is the next section.
• The document contains its own expiration date and the date passes.^[3]
• You divorce an agent-spouse. In many states, divorce automatically strips an ex-spouse of the appointment.^[3]
• A court removes the agent after finding abuse.^[3]
• You become incapacitated and the document was not durable.^[3]

You can revoke a power of attorney at any time, for any reason, as long as you are mentally competent.^[1] It is not a contract with your agent. It is a grant of authority, and the grant is yours to withdraw.

Do it in writing. Sign a revocation with the same formality you used for the original, notarized, so no one can argue about it later. Then close every loop the old document opened:

• Deliver the signed revocation to the agent and ask for every copy of the old POA back.
• Send the revocation to every bank, brokerage, and office that has the old document on file. A revoked POA that a bank never heard about still works at that bank's counter.
• If the old POA was recorded with a county, which real estate POAs often are, record the revocation too. Revocation filings run $50 to $200.^[7]

If you are replacing the agent rather than going without, sign the new POA and state inside it that all prior powers of attorney are revoked. Then repeat the notification list above with the new document.

That is the whole system. One notarized page, signed while you are competent, decides who can act for you when you cannot, and the free-form version costs under $30.^[6] People who skip it are not avoiding the decision. They are deferring it to the worst possible week.