The Basic Rule: Sign the Principal's Name, Then Your Own

When you hold a power of attorney, you sign documents in your principal's name—the person who gave you the authority—followed by your own name and title. The standard format is: "[Principal's Name] by [Your Name], Attorney-in-Fact" or "[Principal's Name] by [Your Name], Power of Attorney."

Some documents have a specific signature line that says "Principal" or "Grantor." You write the principal's name there. On a separate line or in parentheses below, you write your own name with your role. The key is making clear that you are signing for someone else, not for yourself.

Different institutions—banks, real estate offices, healthcare providers—sometimes have their own signature blocks or requirements. Always ask the organization handling the document whether they have a preferred format before you sign. A few minutes of clarification prevents documents from being rejected later.

Key Takeaways

  • Sign the principal's name on the signature line, then add your name and title (Attorney-in-Fact or Power of Attorney) below or in parentheses.
  • The document must show that you are signing on behalf of the principal, not signing for yourself.
  • Banks, title companies, and government offices often have their own signature formats—ask before you sign to avoid rejection.
  • Some documents require the principal's initials or a notary's seal even when signed by an attorney-in-fact; check the document instructions first.
  • Keep a copy of the power of attorney document itself with you when signing, because many organizations will ask to see it.

When You Need to Show the Power of Attorney Document

Most organizations will not accept a signature from an attorney-in-fact without seeing the actual power of attorney document. Before you sign anything, bring the original or a certified copy of the power of attorney with you. The bank, title company, or government office will often photocopy it and keep it on file.

If you are signing remotely—by mail or electronically—send a copy of the power of attorney along with the signed document. Some institutions ask for a certified copy, which means a notary or court clerk has verified it matches the original. Your state's court clerk can usually provide a certified copy for a small fee.

Do not assume the organization has the power of attorney on file from a previous transaction. Even if you signed documents there before, they may require a fresh copy each time, especially if the document is more than a few years old or if different departments are handling the new transaction.

Documents That May Require the Principal's Initials or Notarization

Some documents—particularly real estate deeds, healthcare directives, and financial account changes—require more than just your signature as attorney-in-fact. The document itself will specify what is needed. Common additional requirements include the principal's initials on each page or a notary's seal.

If the document says the principal must initial or sign, you cannot sign those parts yourself, even with a power of attorney. You will need to get the principal to initial or sign those sections, or the document will not be valid. This is especially true for healthcare decisions and real estate transfers, where the law often requires the principal's own signature on certain lines.

If the principal is unable to sign or initial—due to illness, disability, or absence—ask the organization whether they have an alternative process. Some will accept a notarized statement from you explaining why the principal cannot sign. Others may require a court order or a different type of power of attorney.

Signature Requirements for Different Types of Documents

Financial documents—checks, bank transfers, account applications—usually need only your signature as attorney-in-fact in the format described above. The bank will have seen the power of attorney and will know the account is authorized for you to sign.

Real estate documents are more complex. Deeds, mortgages, and title transfers often require the principal's signature on certain lines even when you hold a power of attorney. The title company or real estate attorney handling the transaction will tell you which lines need the principal's signature and which you can sign. Never assume you can sign the entire document yourself.

Healthcare and medical documents vary by state and by the type of decision. A healthcare power of attorney may let you sign consent forms, but some states require the principal's signature on the power of attorney document itself before it is valid. Government documents—tax forms, Social Security requests, veteran benefits—have their own rules. The agency will tell you what signature format they accept.

What Happens If You Sign Incorrectly

If you sign only your own name without indicating you are signing as attorney-in-fact, the organization may reject the document or treat it as your personal signature rather than the principal's. This can create legal problems: the principal may not be bound by the agreement, or you may be held personally responsible instead.

If you sign the principal's name without your own name and title, the document may look forged or unauthorized. Banks and title companies will ask for clarification, and the transaction will stall while they verify the power of attorney.

If you sign a document you are not authorized to sign under the power of attorney, you may be personally liable for the consequences. For example, if the power of attorney covers financial matters only and you sign a healthcare decision, you have exceeded your authority. Always read the power of attorney document before signing anything to confirm you have the right to act.

Electronic Signatures and Digital Documents

When signing electronically—through a bank's website, a DocuSign form, or a government portal—follow the same rule: sign the principal's name in the signature field, then add your name and title. Some platforms have a separate field for "signer capacity" or "role"; use that field to identify yourself as attorney-in-fact.

If the platform does not have a separate field for your role, type it in parentheses after your name in the signature field itself. For example: "John Smith (by Jane Smith, Attorney-in-Fact)." Take a screenshot or save a copy of the signed document showing how you signed it, in case the organization later questions the signature format.

Some digital platforms require you to upload a copy of the power of attorney before you can sign. Others ask for it after. Either way, have it ready and follow the platform's instructions exactly. If you are unsure whether the platform will accept your signature format, contact the organization by phone before you sign.

Frequently Asked Questions

Can I sign my own name instead of the principal's name?

No. If you sign only your own name, the document is your personal signature, and you may be held personally responsible for it. Always sign the principal's name followed by your name and title as attorney-in-fact. This makes clear that you are acting on the principal's behalf, not for yourself.

What if the principal is present when I sign—can they co-sign with me?

Yes, and sometimes the organization will ask for it. If the principal can sign, their signature on the document strengthens it and removes any question about whether you had authority. However, if the principal is unable to sign, your signature as attorney-in-fact alone is sufficient, provided the power of attorney is valid and you are authorized to sign that type of document.

Do I need a notary to witness my signature as attorney-in-fact?

Not always. Many documents—bank transfers, bill payments, account changes—do not require notarization. However, real estate documents, healthcare directives, and some government forms do. The document itself will say whether notarization is required. If it does not specify, ask the organization handling it before you sign.

What if I make a mistake and sign the document incorrectly?

Ask the organization whether they can accept a corrected version. Some will let you cross out the incorrect signature, initial the correction, and re-sign. Others will require you to obtain a new blank copy of the document and sign it correctly. Do not try to alter the document without the organization's permission, as that can make it invalid.

Can I sign a document if the power of attorney has expired?

No. If the power of attorney has expired, you no longer have authority to sign on the principal's behalf. The organization will reject the document. If the principal is still living and still wants you to have authority, you will need a new power of attorney document. If the principal has passed away, you cannot sign as attorney-in-fact; the principal's estate or executor must handle the matter instead.