How to Sign a Check as Power of Attorney

Signing a check for someone else under a Power of Attorney (POA) is one of the most common things an agent does, and one of the easiest to get wrong. Sign it the wrong way and the bank can reject the check, or worse, you can end up personally on the hook for it.

This guide covers the exact signature format, how to endorse a check you are depositing, what your bank will ask for, and the rule that protects you from personal liability.

The Correct Format to Sign a Check as POA

When you write or sign a check as an agent, you must show that you are signing for the principal, not as yourself.

Standard format:

[Principal's Name], by [Your Name], as Attorney-in-Fact

Example:

John Doe, by Jane Smith, as Attorney-in-Fact

Some banks accept the shorter "John Doe, by Jane Smith, POA," but the full "as Attorney-in-Fact" wording is the most widely recognized. When space on the signature line is tight, it is still worth writing the full phrase.

How to Endorse a Check You Are Depositing

If a check is made out to the principal and you are depositing it on their behalf, endorse the back of the check like this:

[Principal's Name] by [Your Name], as Attorney-in-Fact For deposit only, account #[principal's account number]

Adding "for deposit only" with the account number protects the funds: it tells the bank the check can only go into that account, not be cashed.

Why You Won't Be Personally Liable (UCC 3-402)

The biggest fear agents have is being stuck paying for something they signed. The protection comes from the Uniform Commercial Code.

Under UCC Section 3-402 (signature by a representative), an authorized representative who signs an instrument is not personally liable if the signature shows they are signing on behalf of an identified principal. In plain terms: if you make it clear you are signing "by [your name], as Attorney-in-Fact" for the principal, the obligation is the principal's, not yours.

The protection disappears if you sign only your own name with no indication you are acting as an agent. That single mistake is what creates personal liability, so the format genuinely matters.

What Your Bank Will Require

Banks are cautious with POAs because check fraud and elder financial abuse are common. Expect them to ask for some or all of the following:

• The original POA or a certified copy kept on file at the bank
• Their own internal POA / agent authorization form, completed and signed
• Proof the POA is current: some banks reject POAs older than a set number of years
• Your government photo ID

Call the branch before you need to sign anything time-sensitive. Requirements vary by bank, and sorting them out in advance avoids a rejected check at the worst moment.

Step-by-Step

1. Confirm your authority. Read the POA. It must grant financial or banking powers. A limited POA for, say, a single real estate sale does not let you sign checks.
2. Get the POA on file with the bank before you sign anything, along with any internal form the bank requires.
3. Use the correct format: principal's name, "by," your name, "as Attorney-in-Fact."
4. For deposits, add "for deposit only" and the principal's account number to the endorsement.
5. Keep a copy of every check and a simple log of what it was for. Your records are your protection if anyone later questions a transaction.

Common Mistakes to Avoid

Signing only your own name. This is the most dangerous error. Without the representative wording, UCC 3-402's protection does not apply and you can be held personally liable.

Depositing the principal's check into your own account. Funds belonging to the principal must stay in the principal's accounts. Commingling money is a breach of your fiduciary duty and a classic red flag for financial abuse.

Writing checks to yourself. Unless the POA expressly authorizes gifts or self-payment, paying yourself from the principal's account can be treated as exploitation, even if you are covering legitimate expenses. Reimburse yourself only with clear documentation and authority.

Using an expired or revoked POA. A non-durable POA ends if the principal becomes incapacitated, and any POA ends at the principal's death. Verify the POA is still valid every time.

Acting after the principal has died. The moment the principal dies, your authority ends. Checks must then go through the estate and the executor, not the POA.

Frequently Asked Questions

Related guides

• How to Sign a Tax Return as Power of Attorney
• How to Sign a Car Title as Power of Attorney
• How to Sign Documents as a Power of Attorney
• Medical Power of Attorney Template & Guide
• Durable Power of Attorney Template & Guide