Do You Need MICR Ink to Print Checks?

What MICR actually is

MICR stands for Magnetic Ink Character Recognition. It's the strip of numbers along the bottom of a check — your routing number, account number, and check number — printed in a specific typeface called E-13B. The characters are shaped so a magnetic reader can identify them by the pattern of a magnetized signal, not just their visual shape, which historically made check sorting machines faster and more reliable than optical reading alone.

MICR ink and MICR toner both contain iron oxide, the same material a magnetic read head detects. Regular black ink or standard laser toner looks the same to the eye but carries no magnetic signal.

Does the font matter even without magnetic ink?

Yes, separately from the ink question. E-13B is also just a distinct, standardized typeface that check-processing systems (and human eyes) are built to recognize. Quick Check Writer always prints the MICR line in the standard E-13B font (GnuMICR) with your routing, account, and check numbers positioned where bank scanners expect them — that part isn't optional and doesn't depend on your printer or toner.

Check 21 and image-based processing

The Check Clearing for the 21st Century Act (Check 21), passed in 2004, lets banks process digital images of checks instead of the physical paper — this is the law behind "substitute checks" and most mobile and ATM deposits today. When a check is processed as an image, the routing and account numbers are typically read optically from the image rather than magnetically off the original paper, which is part of why some banks have relaxed how strictly they enforce magnetic ink for everyday use.

That said, Check 21 made image processing legal — it didn't eliminate magnetic-ink requirements across the board. Checks still sometimes move through equipment that reads the magnetic signal directly, particularly at high-volume processing centers, and federal rules around "cash items" still reference the magnetic code line.

When magnetic ink or toner actually matters

• High check volume — a business issuing many checks a month is more likely to run into equipment that still reads magnetically.
• Your specific bank's policy — some banks explicitly require magnetic ink/toner in their business account terms; others don't mention it.
• Older check-processing equipment — some smaller or older systems rely more on the magnetic signal than newer image-based ones.
• Printer type — MICR toner is a laser printer consumable; MICR ink is for inkjet printers. The two aren't interchangeable, and regular toner/ink has no magnetic content at all.

For an individual writing a handful of personal checks a year, image-based deposit (phone deposit, ATM, teller scan) has made magnetic ink largely a non-issue in practice. For a business cutting dozens or hundreds of checks a month, it's worth confirming with your bank.

Test with your bank first

Before committing to a magnetic toner cartridge or printing a large batch, print one check with your regular toner or ink and deposit or cash it through your normal channel. If it clears without issue, your bank's current process is working fine without magnetic ink for your volume. If it's flagged or rejected, that's your answer — switch to MICR toner/ink for future checks and ask your bank directly whether it's required for your account type.

Quick Check Writer doesn't sell check stock or MICR toner — it prints the correct E-13B characters and layout; the ink or toner cartridge in your printer is a separate purchase from an office supply store, and whether it needs to be magnetic is the question this test answers.

The bottom line

You always get the right font and positioning from Quick Check Writer. Whether you also need a magnetic ink or toner cartridge depends on your bank's processing method and your volume — not on the software. When in doubt, ask your bank directly; it's the only source that knows how it clears your specific account's checks. A two-minute phone call or a line in your account agreement settles it for good, and then you never have to think about it again when you print checks at home.

Related guides

• Blank check stock guide
• Print business checks
• Print checks at home
• Is it legal to print your own checks?
• Print payroll checks

Sources: Federal Reserve / Check 21 Act (12 U.S.C. 5001 et seq.); ANSI X9 standards (check and MICR specifications)

Last updated October 27, 2026.