The correct way to sign a POA check
When you sign a check on behalf of someone else under power of attorney, you must sign in a way that makes clear you are acting as their agent, not as yourself. The standard format is to write the principal's name first, then write "by" and then your own name. For example, if you hold power of attorney for John Smith and you are signing as his agent, you would write: "John Smith, by Marcus Chen" or "John Smith by Marcus Chen, Attorney-in-Fact."
Some banks accept variations on this format. You may also write "John Smith, by Marcus Chen, POA" or straightforward "John Smith by POA." The key is that anyone reading the check can see that John Smith is the account holder and you are signing on his behalf. Never sign only your own name on a check drawn from his account—that creates confusion about who owns the money and can raise red flags with the bank.
Before you sign any check, confirm with the bank that holds the account what format they prefer. Call the bank's main number, ask for the account holder's branch, and tell them you hold power of attorney. They will tell you exactly how they want the signature to appear. This takes five minutes and prevents checks from being rejected.
Key Takeaways
- Sign POA checks with the principal's name first, followed by "by" and your name, such as "John Smith by Marcus Chen."
- Always include language that shows you are acting as agent or attorney-in-fact, never sign only your own name on the principal's account.
- Contact the bank before signing to confirm the exact signature format they require for power of attorney checks.
- Keep a copy of the signed POA document with you when depositing or cashing checks, in case the bank asks to verify your authority.
- Some banks require the POA to be registered with them before they will honor checks signed by an agent.
What the bank needs to see before you sign
Most banks will not honor a check signed under power of attorney unless they have already seen and recorded the POA document itself. Before you sign your first check, bring the original power of attorney document to the bank branch where the account is held. Bring a photo ID as well. The bank will make a copy, file it in their records, and note on the account that checks may be signed by you as agent.
This step is not optional. If you sign a check without the bank having the POA on file, the check may bounce or be returned to the payee, even if the account has enough money. The bank's system will flag the signature as unauthorized because they have no record that you have the right to sign. Once the POA is registered, future checks will clear normally.
If the account is at a large national bank, ask whether they have a specific POA registration form they want you to fill out. Some banks like Wells Fargo, Bank of America, and Chase have their own paperwork in addition to the state POA document. Filling out their form takes 10 to 15 minutes and prevents delays later.
Signing the check itself: step by step
Write the check as you normally would, filling in the payee name, amount, date, and memo line. When you reach the signature line at the bottom right of the check, pause. Do not sign yet.
On the signature line, write the principal's name in full. If the account is under "John Smith," write "John Smith" on the line. Then, on the same line or directly below it (depending on the space), write "by" and then your full name. Your finished signature should read "John Smith by Marcus Chen" or, if space is tight, you may write it on two lines as "John Smith / by Marcus Chen."
Use the same signature format every time you sign a check from this account. Consistency helps the bank's processing system recognize the signature and reduces the chance that the check will be flagged for manual review. If you vary the format—sometimes writing "by," sometimes writing "POA," sometimes just your name—the bank may question whether the signature is authentic.
What happens if you sign it wrong
If you sign only your own name on a check from the principal's account, the bank may refuse to process it. The check will be returned to the payee with a note that the signature does not match the account holder's name. This creates a delay and may embarrass you in front of the payee, especially if it is a bill payment or a check to a business.
If you sign the principal's name without indicating that you are signing as agent, the bank may also reject the check. Banks are trained to watch for forged signatures, and a signature that looks like someone else's name will trigger a review. When the bank calls to verify, you will have to explain that you hold power of attorney, and the check will be delayed while they confirm this.
The safest approach is to always include "by" and your name, and to make sure the bank has the POA document on file before you sign anything. This prevents confusion and keeps checks moving through the system without delay.
Registering the POA with the bank: what to bring
Bring the original power of attorney document or a certified copy. If you have only a photocopy, ask the attorney who drafted the POA whether they can provide a certified copy—this is a copy stamped and signed by the attorney or a notary to confirm it matches the original. Some banks will accept a photocopy if you also bring the original to show, but certified copies are safer.
Bring your photo ID and, if possible, the principal's photo ID as well. If the principal is unable to come to the bank, bring a letter from them authorizing you to register the POA on their behalf. The bank may also ask for the principal's account number or a recent statement to confirm which account the POA covers.
If the POA is old or was drafted in another state, the bank may ask questions about whether it is still valid. Bring any paperwork that shows the POA has not been revoked—for example, a letter from the principal or the attorney confirming it is still in effect. If the principal has since died or become incapacitated, tell the bank when ready; a POA ends when the principal dies, and using it after that point is illegal.
Special situations: joint accounts and multiple signers
If the account is held jointly by two people and you hold POA for one of them, the rules are the same. You still sign with the principal's name and "by" your name. The other account holder can sign normally with just their own name. Both signatures are valid on the same check.
If you hold POA for multiple people—for example, you are the agent for both a mother and a father—you will need to sign each check with the correct principal's name. A check from the mother's account reads "Mother's Name by Your Name." A check from the father's account reads "Father's Name by Your Name." Do not mix the names or sign one principal's name on a check from another principal's account, even if you have POA for both.
If the principal has named a co-agent (another person who also holds POA), either of you can sign checks alone. You do not both have to sign the same check unless the POA document specifically requires it. If it does require both signatures, write both names on the signature line: "John Smith by Marcus Chen and by Sarah Lee."
Keeping records of checks you sign
Keep a record of every check you sign as agent. Write down the date, check number, payee, amount, and what the check was for. This protects both you and the principal. If there is ever a question about whether a check was authorized, you have documentation. If the principal later disputes a payment, you can show that you signed it correctly and for a legitimate purpose.
Many people keep a straightforward spreadsheet or notebook. Others photograph the front and back of each check before mailing it. The method does not matter as much as consistency. The principal has the right to see all checks signed on their behalf, and you should be ready to show them at any time.
If you are managing the account for a long time, ask the bank for monthly statements and review them carefully. Look for any checks that were not signed by you or the principal. If you see unauthorized activity, report it to the bank when ready. Your record-keeping makes this easier because you can compare your list to the statement.
Frequently Asked Questions
Can I sign a check with just "POA" instead of writing "by" and my name?
Some banks accept "John Smith, POA" as a signature, but it is not the clearest format. Writing "John Smith by Marcus Chen" is better because it shows both the principal's name and your name, leaving no doubt about who signed and in what capacity. Call your bank and ask what they prefer before you sign checks this way.
What if the principal's name on the check does not match the account exactly?
The principal's name on the check must match the name on the account exactly. If the account is under "John Michael Smith" but you write "John Smith," the bank may reject the check. Check the account statement or ask the bank what name appears on the account, then use that exact name every time.
Do I need to tell the payee that I am signing as power of attorney?
No. The signature on the check itself makes this clear. You do not need to write a separate note or explanation. If the payee questions the signature, they can contact the bank, and the bank will confirm that the check is valid.
Can I sign a check if the principal is present but does not sign it themselves?
Yes. The whole point of power of attorney is that you can sign on the principal's behalf whether they are present or not. The principal does not have to sign; you sign alone, using the format "Principal's Name by Your Name." The principal's presence does not change the signature format.
What if I make a mistake and sign the check wrong?
Void the check by writing "VOID" across the front in large letters. Do not cross out the signature or try to fix it. Tear up the voided check or keep it in your records. Start over with a new check and sign it correctly. Banks will not process a check with corrections or cross-outs on the signature line.