Look at the numbers at the bottom of the check. This is the MICR (Magnetic Ink Character Recognition) Line. There are two sets of encoded numbers; the first contains the bank's routing number, and the second contains the customer's account number along with the check number of the specific check. These numbers are printed with a special type of ink that allows encoding machines to read them electronically.
Find the check number. This is printed in the upper right hand corner of the check. It is also printed at the bottom of the check on the MICR line. Check numbers are sequential within a checking account.
Locate the bank's routing number on the bottom of the check in the MICR line. These numbers are also referred to ABA numbers or routing transit numbers and are assigned to financial institutions by the American Bankers Association (ABA). This 9-digit number serves to identify your bank and may begin with 0,1,2 or 3.
Look for the account number. This number is unique at your bank and is located on the bottom of the check on the MICR line.
Locate the fractional number. The fractional number is found at the upper right portion of the check. It can appear just below the check number, or it can be printed to the left of the check number. The fractional number identifies the specific bank or branch that the check is drawn from.
See if you have an ACH R/T number. The Automated Clearing House (ACH) routing number can be found under the bank name and logo on the left side of the check and may be the same as the routing number mentioned above.