Either person can endorse the check if its pay-to line lists either one person "or" the other. However, both must sign if their names are linked by the word "and." 1 ...

Sign Your Name: Use a black or blue ink pen to sign your name on the endorsement line on the back of the check. To ensure smooth processing, your signature must match the name on the front of the ...

If you write a check for $1,000 but you meant to make out the check for $1,050, write “VOID” across the front and back of the check, and be sure to mark the check number as void in your check ...