What signing as power of attorney means
When you sign as power of attorney, you are signing a document on behalf of someone else—the person who gave you that authority. Your signature counts as their signature in the eyes of the law, as long as you follow the rules that came with your power of attorney document.
The key rule is this: you must sign the document in a way that makes clear you are acting as their agent, not on your own behalf. If you just write your own name, a bank or court may reject it. If you write it correctly, the document will be treated as if they signed it themselves.
How you sign depends on what type of power of attorney you hold and what the document requires. Some institutions have their own rules about the format. Before you sign anything important—a bank transfer, a medical decision, a real estate deed—check with the organization handling the transaction to see exactly how they want the signature to appear.
Key Takeaways
- Sign the principal's name first, then write "by" and your own name, or sign your name and write "as power of attorney" next to it—the exact format depends on what the document or institution requires.
- You must have a valid power of attorney document that gives you authority to sign for that specific type of transaction, or your signature will be rejected.
- Banks, hospitals, and government agencies often have their own signature rules; call ahead and ask how they want the signature formatted before you sign.
- Keep a copy of the power of attorney document with you when you sign, because the organization may ask to see it as proof of your authority.
- If the document requires a notary, the notary will watch you sign and verify your identity—you cannot sign as power of attorney and then have it notarized later without the principal present.
The correct signature format
The most common format is to write the principal's name, then "by," then your own name. For example: "John Smith by Jane Smith." This makes it clear that John Smith is the person the document is about, and Jane Smith is signing on his behalf.
Some institutions prefer a different format: you sign your own name and then write "as power of attorney for [principal's name]" underneath or next to your signature. Ask the bank, hospital, or organization first—they may have a specific requirement printed on their forms or in their policies.
A few organizations will provide you with a signature line that says "Principal's signature or power of attorney." In that case, you can sign your own name on that line, because the line itself already explains what you are doing.
Whatever format you use, never sign only the principal's name without your own name or title. That looks like forgery, and it will be rejected. The point of signing as power of attorney is to show that you are authorized to act—so your identity must appear on the document.
When you need the power of attorney document with you
Most organizations will ask to see the actual power of attorney document before they accept your signature. They need to verify that you have the authority to sign for this specific type of transaction. Bring the original or a certified copy.
Some institutions will make a photocopy for their records. Others will scan it and keep the digital file. A few may ask you to leave a certified copy with them. Do not hand over your only copy unless you have made duplicates first.
If the power of attorney document is very old or if there is any question about whether it is still valid, the organization may contact a lawyer or ask you to have it notarized again. This can slow down the process, so if you know the document is old, mention that upfront and ask what they need.
Signing financial documents at a bank
Banks have strict rules about power of attorney signatures because they are handling money. Call the bank before you go in and ask what they need: the original power of attorney document, a copy, your ID, the principal's ID, or anything else.
Some banks require that you sign in front of a bank officer or notary. Others will accept your signature if you bring the power of attorney document and your ID. A few large banks have their own power of attorney forms they want you to fill out and sign instead of using the one you have—ask whether this is required or optional.
If you are transferring money, the bank may also ask why the principal is not signing themselves. Be straightforward: explain that the principal is unable to come in, is out of state, or is incapacitated. Banks are used to this and will not judge you, but they do need to know the transaction is legitimate.
Signing medical and healthcare documents
Hospitals and doctors' offices treat power of attorney differently than banks do. Some recognize a general power of attorney; others require a specific healthcare power of attorney or healthcare proxy document. Before you sign anything medical, ask the hospital or doctor's office which document they need.
If you have a healthcare power of attorney, bring it with you. If you only have a general power of attorney, the medical provider may refuse to accept it, because general powers of attorney do not always cover medical decisions. In that case, you may need to get a court order or have the principal sign a separate healthcare authorization.
Medical staff will usually ask you to sign consent forms, treatment authorizations, or HIPAA forms on the principal's behalf. Sign these the same way you would sign a financial document: with the principal's name and your own, or in whatever format the form instructs.
Signing real estate and legal documents
Real estate deeds, mortgages, and contracts almost always require a notary, even when signed by power of attorney. The notary will watch you sign and verify your identity with a photo ID. You cannot sign as power of attorney and then have the document notarized later without the principal present.
Before you sign a real estate document, have a real estate attorney or title company review the power of attorney to make sure it covers this type of transaction. Some powers of attorney exclude real estate, or they may have limits on the amount of money involved. If the document does not cover what you are trying to do, the signature will not be valid.
Bring the original power of attorney document to the notary appointment. The notary will want to see it and may keep a copy for the notary record. Have your ID ready as well.
What to do if the organization refuses your signature
If a bank, hospital, or other organization says they will not accept your power of attorney signature, ask them why. The most common reasons are: the power of attorney document is too old, it does not cover this type of transaction, it is not notarized (when it should be), or the signature format is wrong.
If the power of attorney is old but still valid, ask the organization whether they will accept it if you have it notarized again. Many will. If the document does not cover the transaction, you may need to get a new power of attorney or a court order.
If the organization is straightforward refusing without a clear reason, ask to speak to a supervisor or the legal department. Bring a copy of your power of attorney document and explain what you are trying to do. If they still refuse, you may need to consult a lawyer to find out whether the organization is within its rights or whether you have other options.
Frequently Asked Questions
Can I sign as power of attorney if the principal is in the room with me?
Yes, but it is unusual. If the principal is present and able to sign, most organizations will ask them to sign instead. If they want you to sign even though they are there, make sure the document clearly shows you are signing as their agent, not as a witness or co-signer. Ask the organization how they want the signature formatted in this situation.
What if I lose the power of attorney document?
Contact the person or organization that created it—usually a lawyer, the court, or the principal themselves. Ask for a certified copy. If you cannot get one, you may need to have a new power of attorney document drawn up and signed by the principal. Until then, you cannot sign on their behalf.
Do I need to tell the principal every time I sign as their power of attorney?
You should keep them informed of major transactions, especially if they are mentally capable of understanding. If the principal is incapacitated, you do not need permission for each signature, but you should keep records of what you signed and why, in case anyone questions your actions later.
Can I sign as power of attorney for multiple people?
Only if you have a separate power of attorney document for each person. You cannot use one person's power of attorney to sign for someone else. Each document must be specific to the principal it covers.
What happens if I sign as power of attorney but I am not actually authorized to do so?
The signature may be invalid, and the organization may refuse to process the transaction. If you knowingly sign without authority, you could face legal consequences. Only sign as power of attorney if you have a valid document that covers the specific transaction you are signing.