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The MICR Line Explained in Plain English
A straightforward look at routing numbers, account numbers, check numbers, and why placement matters.
Print Your ChecksJul 12, 20266 min read
What the MICR line contains
The MICR line is the machine-readable row near the bottom of a check. It commonly contains the bank routing number, the payer account number, and the check number in a standardized sequence.
Why accuracy matters
Incorrect digits can direct a payment to the wrong account or cause processing problems. Placement and print clarity also matter because financial institutions use automated equipment to read the line.
- Verify every routing-number digit
- Use the correct account number
- Keep check numbers consistent
- Avoid scaling that moves the line
Review your first setup
When setting up a new account or paper format, compare the preview with the information provided by your bank. Run a single test and confirm acceptance requirements before a larger print run.