You sign a check in one of two places depending on your role. If you are writing the check, your signature goes on the line in the bottom-right corner of the front. If you are receiving the check and want to deposit or cash it, you sign the back along the short left end, inside the area marked “Endorse Here.” Each signature does a different job, and putting it in the wrong place — or leaving it off — can get the check rejected. So where do you sign a check depends entirely on which side of the transaction you are on.
Writing the Check: Sign the Front, Bottom Right
The signature line on the front sits in the lower-right corner. That signature is what authorizes your bank to release the money. Without it, the check is not a valid instrument: under the Uniform Commercial Code, no one is liable on a check unless they signed it or had an authorized agent sign for them.1Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 3-401 – Signature Your bank can only charge your account for a check that is “properly payable,” which means you authorized it and it complies with your account agreement.2Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 4-401 – When Bank May Charge Customers Account
Sign the way your bank has you on file. If the signature doesn’t match, the check may be flagged or returned. The UCC is generous about form — a signature can be handwritten, stamped, or made by machine, and can be any name, mark, or symbol you adopt with the intent to authenticate the document.1Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 3-401 – Signature What matters at the teller window is consistency with the specimen on your account.
Joint Accounts May Need Two Signatures
If the account is joint, whether one signature or both are required depends on how the account was set up. Most joint accounts let either holder sign independently; some are configured to require both. The account agreement controls, and co-owners generally must have equal withdrawal rights for the account to work as a true joint account.3FDIC.gov. Financial Institution Employees Guide to Deposit Insurance – Joint Accounts Check with your bank before writing a check you aren’t sure will clear with one signature.
Depositing or Cashing a Check: Sign the Back, Left End
When you receive a check, you endorse it by signing the back before you deposit or cash it. The signing area is on the left end of the back — the “trailing edge,” defined as the left side when you look at the check from the front.4GovInfo. 12 CFR Part 229 Appendix D Most checks print a few lines or a small box labeled “Endorse Here” in that spot. Under the UCC, an endorsement is any signature on the instrument, other than the writer’s, made to transfer it, restrict payment, or accept liability.5Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 3-204 – Indorsement
Stay inside the first 1.5 inches from the trailing edge. Federal rules reserve the rest of the back for bank processing stamps and routing marks, and writing outside the endorsement zone can cause scanning errors.6Federal Reserve. Final Amendments to Regulation CC
Sign your name exactly as it appears on the “Pay to the Order of” line. If your name is misspelled on the front, sign first with the misspelled version, then sign again with your correct legal name directly below. Adding your account number under your signature gives you some protection if the check is lost in processing.
Three Ways to Endorse the Back
How you sign the back decides who can do what with the check next. There are three common endorsement types.
Blank Endorsement
A blank endorsement is just your signature. It’s the most common and the least secure. Once a check is endorsed in blank, it becomes payable to whoever holds it and can be handed off to anyone.7Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 3-205 – Special Indorsement, Blank Indorsement, Anomalous Indorsement A found or stolen check with only your signature on the back can potentially be cashed by whoever picks it up. Wait to sign until you’re at the bank or ready to submit the deposit.
Restrictive Endorsement
A restrictive endorsement limits what happens after you sign. The common version is writing “For Deposit Only” above your signature, which tells the bank the check can only go into your account. You can tighten it further by adding your account number and the bank’s name, for example “For Deposit Only to Account #12345 at First National Bank.” The UCC recognizes endorsements using the words “for deposit” or “for collection” as creating specific obligations on the bank handling the check.8Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 3-206 – Restrictive Indorsement
Special Endorsement
A special endorsement names a specific person as the next payee. Write “Pay to the Order of [person’s name]” and sign below. After that, only the named person can negotiate the check, and they will need to add their own endorsement to deposit or cash it.7Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 3-205 – Special Indorsement, Blank Indorsement, Anomalous Indorsement This is how you sign a check over to a third party. Many banks are cautious about accepting third-party checks, so the person you’re transferring it to should confirm with their bank first.
Mobile Deposit Needs an Extra Line
Mobile deposits follow the same signing location, with one addition. Most banks now require you to write “For Mobile Deposit Only” (and sometimes the bank’s name) beneath your signature on the back. This restrictive language helps block the same check from being deposited a second time somewhere else. Under Regulation CC, a bank that accepts a check with a restrictive endorsement inconsistent with the deposit method — such as a check marked “For Mobile Deposit at Bank A” that gets deposited at Bank B — loses certain protections against duplicate-deposit claims.9eCFR. 12 CFR Part 229 – Availability of Funds and Collection of Checks (Regulation CC)
When you photograph the check, place it on a dark, flat surface and capture the front and the endorsed back with all four edges visible. Keep the physical check for a few days after submitting, until your bank’s app or website confirms it is safe to destroy.
Signing a Check for a Business
If you are signing on behalf of a business, your signature needs to show you are signing as a representative, not personally. Under the UCC, when the check names the business and your signature clearly shows you are signing on its behalf, only the business is liable. If the check doesn’t identify the business, or your signature doesn’t indicate your representative role, you can be held personally liable for the amount.10Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 3-402 – Signature by Representative
The safe format has three elements: the business name, your signature, and your title. A corporate officer, for example, writes the company name, signs below it, and adds a title like “President” or “Treasurer.” The same approach fits partnerships, LLCs, and other entities. Pre-printed business checks usually carry the company name already, but adding your title next to your signature removes any ambiguity.
A Few Signing Pitfalls Worth Knowing
Two timing issues can affect a check you’ve already signed, even if you signed it correctly.
A check does not stay valid forever. Under the UCC, a bank has no obligation to honor a check presented more than six months after the date on it, though it may choose to pay a stale check in good faith.11Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 4-404 – Bank Not Obliged to Pay Check More Than Six Months Old If a check you’re holding is approaching six months old, deposit it or ask the issuer for a replacement.
Writing a future date on a check doesn’t force the bank to wait. The UCC treats a post-dated check as payable on demand, so a bank can process it whenever it’s presented regardless of the written date.12Cornell Law School / Legal Information Institute (LII). Uniform Commercial Code 3-113 – Date of Instrument To make the bank hold it, you generally need to give advance written notice specifying the check’s number, amount, and the date you want it honored.