The check number identifies an individual check within your account, usually printed in the top right corner and again in the MICR line at the bottom. It's typically 3–4 digits for personal checks and can run higher for business accounts.
Why it matters
- It lets you and your bank track exactly which check cleared, bounced, or is still outstanding.
- Sequential numbering makes it easy to spot a missing or duplicated check in your records.
- If a check is lost or voided, the number stays "used" in your records rather than being reassigned.
If you print your own checks, your software should track and increment the check number for you — Check Writer 123 assigns the next number automatically every time you write a new check, per bank account.