A debit or credit card isn’t valid until it’s signed by the authorized cardholder and store clerks are supposed to decline any unsigned card — but many simply don’t know the rules.
My recommendation would be to always sign the back of your credit or debit card to ensure your identity and your credit stay safe.
Do you have to sign your credit card?
The Simple Answer is Yes — for These Two Reasons. First, technically speaking, your credit card is not valid until you sign it. In fact, many credit cards come printed with the instruction that the card is “Not valid without an Authorized Signature.” Second, merchants may decline a purchase when your card is not signed
Why do I need to sign the back of my debit card?
A signature on the card is a sign that the card is valid and useable. Merchants may refuse unsigned cards for payment. The signature indicates that the card is valid and active.
Do I need to sign my Amex card?
American Express will no longer require a signature. Starting next April, you won’t need to sign anything to make a purchase with an American Express card.
Is it illegal to ask for ID with a credit card?
In many cases, merchants are not allowed to require an ID for credit card purchases. They can ask for your ID, but they cannot refuse to accept your credit card if you don’t show your ID, as long as your credit card is signed.