The correct signature format when you hold power of attorney
When you sign a check on behalf of someone else as their power of attorney, you must sign in a way that makes clear you are acting in that role, not as yourself. The standard format is to write the account holder's name first, then your own name below it, preceded by "By" or "As POA" or "Attorney-in-Fact." For example: "John Smith, By Sarah Chen" or "John Smith, As Power of Attorney, Sarah Chen." The bank needs to see when ready that this is an authorized signature on someone else's behalf, not a forged one.
Different banks may have slightly different preferences, so before you sign your first check, call the bank that holds the account and ask them which format they want. Some banks provide a signature card specifically for power of attorney signers, which you will have filled out and signed when the account was set up. That card tells the bank exactly how your signature should appear. If you did not fill one out, the bank can walk you through the correct format or send you a form to complete.
Never sign only your own name on a check drawn from an account you do not own. That creates ambiguity about whether you have authority to spend that money, and the bank may refuse to cash it or may flag it as suspicious activity.
Key Takeaways
- Always include the account holder's name on the check, followed by your signature with a notation like "By," "As POA," or "Attorney-in-Fact."
- Contact the bank before you sign your first check to confirm the exact signature format they require.
- A power of attorney signature card, completed when the account was opened, tells you the bank's preferred format.
- Signing only your own name on someone else's account can cause the bank to reject the check or investigate the transaction.
What the bank needs to see on the check
Banks process thousands of checks daily and rely on the signature line to verify that the person signing has authority to spend the money. When you sign as power of attorney, the bank is looking for two pieces of information: the name of the person whose account it is, and clear evidence that you are acting on their behalf rather than your own.
The most common formats are "John Smith, By Sarah Chen" or "John Smith, As Attorney-in-Fact, Sarah Chen." Some banks accept "POA" as shorthand for power of attorney. The key is that anyone reading the check—the bank teller, the receiving bank, the account holder themselves—can see at a glance that Sarah Chen is not the account owner but is authorized to sign on John Smith's behalf.
If the account holder's name does not appear on the check at all, the bank will likely reject it or ask questions. The receiving bank may also refuse to accept it, because they have no way to verify that you had permission to sign.
Confirming your signature authority before you sign
Before you write and sign your first check, you need to know two things: that the bank recognizes your power of attorney, and what signature format they require. Call the bank's customer service line, give them the account number, and ask to speak with someone about power of attorney signing procedures.
Tell them you hold power of attorney for the account and ask them to confirm that your authority is on file. Ask them what signature format they want to see on checks. If they do not have a signature card on file for you, they may ask you to come in and sign one, or they may send you a form by mail. Do not skip this step. A signature that does not match what the bank expects can cause the check to bounce or be delayed.
If you are signing checks for the first time and the account was set up years ago, the bank's records may be incomplete. Clarifying this now prevents problems later.
What happens if you sign incorrectly
If you sign a check as power of attorney but do not include the account holder's name or do not clearly indicate your role, the bank may refuse to cash it. The teller might ask you for additional identification or documentation proving you have authority to sign. In some cases, the check will be returned to the person who tried to deposit it, marked "signature does not match" or "unauthorized signature."
If the receiving bank processes the check anyway and later discovers the signature was improper, they may reverse the transaction and charge the account a fee. This creates delays and confusion for the person who was supposed to receive the payment.
Signing only your own name on someone else's account is especially risky. It can look like fraud, even if you have legitimate authority. The account holder might dispute the transaction, or the bank might freeze the account while they investigate.
Signing checks when you have limited power of attorney
Some power of attorney documents limit your authority to specific types of transactions or amounts. For example, you might be authorized to pay medical bills and household expenses but not to withdraw cash or make large transfers. Before you sign a check, review the power of attorney document to confirm that paying this particular bill is within your authority.
If the check amount exceeds your limit, you will need to contact the account holder or ask them to sign it themselves. Signing a check outside the scope of your authority, even if you have the account holder's verbal permission, can create legal problems for both of you.
Keep a copy of the power of attorney document with you when you are signing checks, in case the bank asks to see it. Some banks require you to show the document before they will cash a check signed by power of attorney.
Handling checks when the account holder is present
If the account holder is present and able to sign, they should sign the check themselves. Power of attorney is meant to act on someone's behalf when they cannot do so themselves—because they are ill, out of the country, or otherwise unavailable. If they are in the room and capable of signing, let them do it.
If the account holder is present but unable to sign due to illness or disability, you can sign on their behalf. In this case, some banks may ask the account holder to initial or acknowledge the check, even if they cannot sign their full name. Ask the bank what they need to see.
If you are unsure whether you should be signing a particular check, contact the account holder and ask. It takes a few minutes and prevents misunderstandings later.
Keeping records of checks you sign
Keep a record of every check you sign as power of attorney. Write down the date, the check number, the amount, who the check was paid to, and what it was for. This creates a clear paper trail showing how you spent the account holder's money and protects both of you if questions arise later.
Many people who hold power of attorney are also responsible for managing the account holder's finances. Detailed records help you track spending, catch errors, and show the account holder (or their family, or a court if necessary) that you have handled the money responsibly.
If the account holder becomes unable to manage their own affairs, these records may be reviewed by a court or by family members. Having clear documentation of your transactions makes that process simpler and protects you from accusations of mismanagement.
Frequently Asked Questions
Can I sign a check with just my name if I have power of attorney?
No. Signing only your name creates confusion about whether you own the account and can cause the bank to reject the check or investigate it as a potential fraud. Always include the account holder's name and a notation like "By" or "As POA" to make clear you are signing on their behalf.
What if the bank does not have a signature card for me on file?
Contact the bank and ask them to create one. They may ask you to come in person to sign it, or they may mail you a form. Do not sign checks until this is done, because the bank will not know what your authorized signature looks like.
Can I sign a check if the power of attorney document has expired?
No. An expired power of attorney is no longer valid. You cannot sign checks or conduct any other transactions on the account holder's behalf. If the document has expired and you need to continue managing their finances, a new power of attorney document must be created and signed.
What should I do if a check I signed is rejected by the bank?
Call the bank when ready and ask why it was rejected. Common reasons include a signature that does not match what they have on file, an incorrect signature format, or a missing notation showing you are acting as power of attorney. Once you know the reason, you can sign a replacement check in the correct format.
Do I need to show the power of attorney document every time I sign a check?
Not every time, but keep a copy with you. Banks may ask to see it, especially the first time you sign a check or if there is any question about your authority. Having it available prevents delays.