What you need to do when you sign as a POA
When you sign a document as a power of attorney, you are signing on behalf of someone else — the person who gave you that authority, called the principal. The way you sign matters legally. You must write the principal's name first, then add language that identifies you as their POA, then sign your own name. A document signed incorrectly — with only your name, or without making clear you are acting as POA — may not be accepted by banks, courts, or other institutions, and the principal could face problems later.
The exact format varies slightly depending on what document you are signing and which state's law applies. But the core rule is the same: make it clear on the face of the document that you are the agent, not the owner or decision-maker in your own right.
Key Takeaways
- Sign the principal's name first, followed by your signature with a notation that you are their power of attorney or agent.
- Common formats are "[Principal Name] by [Your Name], as Power of Attorney" or "[Principal Name], by [Your Name], Attorney-in-Fact".
- Some institutions provide their own signature blocks or require specific wording — always ask before you sign.
- Keep a copy of the power of attorney document itself with the signed paperwork so the recipient can verify your authority.
- If you sign incorrectly, the document may be rejected or create liability for the principal, so ask when in doubt.
The standard signature format for POA documents
The most common way to sign is to write the principal's name, then add a line underneath or next to it that says "by [Your Name], Power of Attorney" or "by [Your Name], as Attorney-in-Fact." Your actual signature goes on that second line. This makes clear that you are signing in a representative capacity, not as yourself.
Example:
John Smith by Sarah Smith, Power of Attorney
Some people write it on a single line: "John Smith, by Sarah Smith, as Power of Attorney." Either layout works, as long as both names and the POA designation appear on the document itself. The key is that anyone reading the document later — a bank, a court, a title company — can see when ready that you signed for someone else, not for yourself.
When institutions provide their own signature blocks
Banks, title companies, and government agencies often have their own forms with pre-printed signature lines. These may say "Principal" and "Agent" or "Principal" and "Power of Attorney." If the form has a specific place for you to sign as POA, use it. Do not cross out the form's language and write your own.
Before you sign, read what the form says. Some require you to print your title (such as "Power of Attorney") next to your signature. Others ask you to check a box confirming you are signing in a representative capacity. Follow those instructions exactly. If the form does not have a POA signature line and you are unsure how to proceed, call the institution and ask. A five-minute phone call prevents the document from being rejected later.
Documents that may require different signature formats
Real estate deeds, vehicle titles, and financial account transfers sometimes have their own rules. A deed, for example, may require the principal's name to appear in the "grantor" section, with your POA signature in a separate acknowledgment section that a notary must witness. A vehicle title may have a specific box for "agent" or "power of attorney."
Court documents, medical records, and tax forms also vary. Some courts require the principal's name and your signature with "as Power of Attorney" written out in full. The IRS has specific rules for who can sign tax returns on behalf of someone else, and it is not always the POA — sometimes it is a tax professional with a separate power of attorney for tax matters. Before you sign anything important, look at the document's instructions or call the issuing agency. Most will tell you the exact format they need.
Why notarization matters for some POA signatures
Not every document you sign as POA needs to be notarized. A check, a medical consent form, or a utility bill authorization usually does not. But real estate transactions, financial account changes, and some legal filings do require a notary's seal. The notary is not verifying that you have the right to sign — that is your responsibility — but rather that you are who you say you are and that you signed the document willingly.
If you are signing a real estate deed, a mortgage, or a financial power of attorney itself, assume notarization is required unless the document says otherwise. Bring your government-issued ID and the original power of attorney document to the notary. The notary will watch you sign, check your ID, and add their seal. This step protects both you and the principal by creating a record that the signature was genuine.
What to bring when you sign as POA
Always bring the original power of attorney document or a certified copy. The institution you are dealing with will want to see it. They may photocopy it, scan it, or ask you to provide a certified copy for their records. Some banks and title companies require a certified copy — one stamped by a court or notary — rather than a photocopy you made yourself.
Bring your government-issued ID as well. Even though you are signing for someone else, the institution needs to verify that you are the person named in the power of attorney. If the document is being notarized, the notary will require your ID. Have both documents ready before you arrive, and ask the institution ahead of time if they need anything else — such as a specific form, a certified copy, or proof of the principal's identity.
Common mistakes to avoid when signing as POA
The most frequent error is signing only your own name without any reference to the principal or your role as POA. This makes it look like you are signing for yourself, which can create confusion or legal problems later. The document may be rejected, or the principal may be held responsible for something they did not authorize.
Another mistake is signing the principal's name yourself without adding your own signature and POA designation. You are not supposed to forge the principal's signature — you sign on their behalf, which means your name and title appear on the document. If the principal is able to sign, they should sign; you sign only when they cannot.
A third error is not keeping a copy of the power of attorney document with the signed paperwork. If a question comes up later about whether you had authority, you will need to show the POA. Keep copies organized and accessible.
Frequently Asked Questions
Do I sign the principal's name or my own name?
You sign your own name, but you write the principal's name first on the document. The format is the principal's name, then a line stating you are their POA, then your signature. You never forge the principal's signature.
What if the document does not have a line for POA signature?
Call the institution issuing the document and ask how they want you to sign. Many have a standard format or can email you a version with the correct signature blocks. Do not guess — a wrong format can cause the document to be rejected.
Do I need a notary every time I sign as POA?
No. Notarization is required for real estate, mortgages, and some legal filings, but not for everyday documents like checks or medical forms. The document itself or the institution will tell you if notarization is needed.
Can I sign if the principal is still alive and able to sign?
Yes, if the power of attorney says you can. Some POAs are "durable" and let you sign even when the principal is able to. Others say you can sign only if the principal is incapacitated. Check the language in your power of attorney document, or ask the institution whether they will accept a signature from both of you.
What happens if I sign incorrectly?
The document may be rejected, or the institution may ask you to sign again in the correct format. In rare cases, an incorrectly signed document could create liability for the principal. If a document is rejected, ask the institution exactly what format they need and sign a new copy.