Can I use Punctuation in my check number?
No, punctuation should never be used in a check number. You may use numbers or a combination of numbers and letters in a check number.
Occasionally you have a unused check stock that you want to use that has been voided in the software. Since check numbers must be unique, to use the check stock, add an alpha character at the end of the check number.
EFT check or ACH check numbering suggestions. EFT+date+alpha EFT122117A, EFT122117B, ...