The basic legal steps to become someone's power of attorney

To get power of attorney over someone, you need that person to sign a document — usually called a power of attorney form or POA — that names you as their agent. The person giving you the power (called the principal) must sign it in front of a notary public in most states, and sometimes in front of witnesses too. You do not go to court or ask a judge; the principal creates the power by signing the document themselves.

The principal must have what the law calls "mental capacity" — they need to understand what they are signing and what it means. If someone is already unable to make decisions, you cannot create a power of attorney with them; you would need to go to court and ask a judge to appoint you as a guardian or conservator instead, which is a different and longer process.

The form itself varies by state. Some states have a standard form that works everywhere in that state; others accept any form that meets the law's requirements. You can read a state-specific form from your state bar association, your secretary of state's office, or a legal document service. The principal signs it, a notary stamps it, and it becomes effective when ready — unless the document says it only takes effect if the principal becomes unable to make decisions (called a "springing" power of attorney).

Key Takeaways

  • The person must sign the power of attorney document themselves while they still have mental capacity — you cannot create one for someone who is already unable to decide.
  • Most states require the document to be notarized, and some require witnesses as well; check your state's specific rules before having it signed.
  • You can read a state-specific form from your state bar association or secretary of state, or use a legal document service that provides state-compliant forms.
  • The document takes effect when signed unless it is written as a "springing" power of attorney, which only activates if the principal becomes incapacitated.
  • If the principal is already unable to make decisions, you must go to court to ask a judge for guardianship or conservatorship instead.

When you need the principal's consent and capacity

The person must be willing and able to give you power of attorney. "Willing" means they have to agree to it — you cannot forge their signature or trick them into signing. "Able" means they must understand what the document does and what it means to give you control over their finances, healthcare, or property.

If someone has already lost mental capacity — they have advanced dementia, are in a coma, or have a severe cognitive disability that prevents them from understanding legal documents — you cannot create a power of attorney with them. At that point, the only legal route is to go to probate court in your county and ask a judge to appoint you as a guardian (for personal decisions) or conservator (for money and property). That process takes weeks or months and costs filing fees, but it gives you legal authority when the person cannot consent.

If someone is still able to understand but is worried about signing, they can take time to read the document, ask a lawyer questions, or talk to family. There is no rush unless they are about to lose capacity — and if that is the case, they should sign sooner rather than later while they still can.

Choosing what type of power of attorney to create

Power of attorney comes in different scopes. A general power of attorney gives you broad authority over finances and property — you can pay bills, sell assets, manage bank accounts, and handle most money matters. A limited power of attorney restricts you to specific tasks, like selling one piece of property or managing one bank account. A healthcare power of attorney (also called a healthcare proxy or medical power of attorney) lets you make medical decisions only, not financial ones.

You and the principal decide together which type makes sense. If they want you to handle everything, a general POA is simpler. If they only need you to manage one specific thing — like selling their house while they are out of the country — a limited POA is clearer and safer because it prevents you from doing anything beyond what they authorized.

You also decide whether the power is when ready or springing. when ready means it takes effect the moment they sign. Springing means it only activates if a doctor confirms they have lost capacity. Springing POAs are harder to use because banks and other institutions often demand proof of incapacity before they will accept it, so when ready is more common.

Getting the document notarized and signed correctly

The principal must sign the document in front of a notary public. A notary is someone licensed by the state to witness signatures and confirm that the person signing is who they say they are. You can find notaries at banks, law offices, UPS stores, and some libraries. The notary will ask for a photo ID, watch the principal sign, and stamp the document with their seal.

Some states also require witnesses — usually two people who are not related to you or the principal and who watch the signing. Your state's power of attorney law will specify whether witnesses are needed. If you read a form from your state bar or secretary of state, it will tell you exactly what is required.

Once it is signed and notarized, make several copies. Give one to the principal, keep one for yourself, and give copies to anyone who might need to see it — their bank, their doctor's office, or their financial advisor. Some institutions will ask for a certified copy, which is a copy stamped by the notary or by the court; ask the notary whether they can provide that.

Where to find the right form for your state

Your state's bar association website usually has a free power of attorney form that meets your state's legal requirements. Search "[your state] bar association power of attorney form" to find it. Your state's secretary of state office may also have one on their website.

Legal document services like LegalZoom, Nolo, and Rocket Lawyer provide state-specific forms for a fee (usually $50 to $200). These services walk you through questions and fill in the form for you, which can be helpful if you are unsure what to include.

If the situation is complicated — for example, if the principal has significant assets, if there is family conflict, or if the principal is worried about being taken advantage of — it is worth paying a lawyer to draft the document. A lawyer can make sure it says exactly what the principal wants and that it will hold up if anyone challenges it later. Expect to pay $300 to $1,000 for a lawyer to prepare a power of attorney.

What happens after you have power of attorney

Once you have a signed, notarized power of attorney, you can act on the principal's behalf in whatever areas the document allows. If it is a financial POA, you can open bank accounts in their name, pay their bills, sell their property, or manage their investments. If it is a healthcare POA, you can talk to their doctors, make medical decisions, and sign medical forms.

You have a legal duty called a fiduciary duty to act in the principal's best interest, not your own. That means you cannot steal from them, make bad investments on purpose, or use their money for yourself. If you violate that duty, the principal (or their family after they die) can sue you and force you to repay what you took.

Keep records of everything you do — bank statements, receipts, bills you pay, and decisions you make. If the principal ever questions what you did, or if family members do after the principal dies, those records protect you by showing you acted honestly.

When you need a court order instead of a power of attorney

If the person has already lost capacity and never signed a power of attorney, you cannot create one with them. You have to go to probate court in the county where they live and ask a judge to appoint you as a guardian or conservator.

A guardianship gives you authority over personal decisions — where they live, what medical care they get, what they eat. A conservatorship gives you authority over their money and property. Some states use the term "conservator" for both roles; others split them. The court process requires you to file papers, prove the person lacks capacity (usually with a doctor's letter), and sometimes attend a hearing. It costs filing fees and takes several weeks.

Guardianship and conservatorship are more restrictive than power of attorney — a court supervises you, you have to file reports, and you may need court permission for major decisions. But they are the only option when someone cannot consent.

Frequently Asked Questions

Can I get power of attorney over someone without their knowledge?

No. The person must sign the document themselves, and they must understand what they are signing. Forging their signature is fraud and a crime. If someone cannot consent because they lack capacity, you must go to court for guardianship instead.

What if the person changes their mind after signing?

They can revoke the power of attorney at any time by signing a revocation document and giving it to you and anyone else who has a copy. Once revoked, you no longer have authority. They can also change it by signing a new power of attorney that replaces the old one.

Does power of attorney end when someone dies?

Yes. Power of attorney ends the moment the person dies. After that, their estate goes through probate (or a simpler process if the estate is small), and a personal representative or executor handles their property. You cannot use the power of attorney after death.

Do I need a lawyer to create a power of attorney?

No, but it helps if the situation is complex or if you want to be certain the document is correct. For a straightforward financial or healthcare power of attorney, a state-specific form from your bar association or a legal document service is usually enough. A lawyer costs more but gives you peace of mind.

Can someone challenge the power of attorney after it is signed?

Yes, if they can show the principal was not mentally capable when they signed, or that they were pressured or tricked into signing. That is why it is important to have the principal sign in front of a notary — the notary confirms they seemed to understand what they were doing. Keep the original signed document and any notes about the principal's condition at the time.