Business Check Writing Guide — Illinois Banks

About business checks in Illinois

Checks issued by banks in Illinois follow the same federal ANSI X9 standard as checks anywhere else in the United States, but a few state-specific considerations are worth knowing. Illinois follows the Uniform Commercial Code Article 3 (Negotiable Instruments) and Article 4 (Bank Deposits and Collections), which between them define how checks are written, accepted, paid, and disputed. Stop-payment requests, stale-dated check rules, and indorser liability all derive from these UCC articles as adopted by the state.

Most banks headquartered in Illinois participate in the Federal Reserve's Check 21 image-exchange network, which means a check deposited at a bank in another state is converted to an electronic image and presented to the paying bank within 24 hours, usually faster. The MICR line on every check sold by a Illinois bank — printed in the standard E-13B font — is what makes that high-speed clearing possible.

If you are setting up a new business and choosing where to bank in Illinois, consider not just the size of the institution but its specific business banking products: the cost of ordering pre-printed checks, whether Positive Pay is included or sold as an add-on, whether the bank's online banking platform supports issuing checks via virtual mail, and whether the bank participates in same-day ACH origination. Larger institutions in our directory typically offer all four, while community banks may offer more personalized service in exchange for fewer self-serve features.

Routing numbers for Illinois banks

Each US bank's routing number is assigned by the American Bankers Association based on the Federal Reserve district. Banks that operate in Illinois may have one of several routing numbers depending on the state where the customer's account was originally opened — large national banks like Chase, Wells Fargo, and Bank of America assign different routings by state, while a community Illinois-only bank typically uses a single routing number for all customers.

The first four digits of any routing number indicate the Federal Reserve processing center; the next four identify the specific bank; the ninth is a check digit calculated from the others. Illinois banks fall predominantly within their assigned Federal Reserve district. Always verify a routing number against your physical check or your bank's official online portal before using it for ACH or wire setup — typing the wrong number causes a payment to bounce and may incur a returned-item fee.

For a verified, machine-readable list of all routing numbers in Illinois, consult a Federal Reserve routing-number lookup directory. Most online directories pull from the same FedACH participant database the banks themselves use.

Common business banking products in Illinois

Most full-service banks operating in Illinois offer a tiered business checking lineup. The basic tier typically includes a low monthly maintenance fee waived above a minimum balance, 50–200 free transactions per cycle, free incoming wires, and a debit/business-credit card. The next tier up usually doubles the free transaction count, adds free outgoing domestic wires, and includes Positive Pay at no extra charge. Premier and treasury-management products add zero-balance accounts, sweep accounts, lockbox banking, and dedicated commercial banker support — these typically require a much higher operating balance.

In addition to the major national banks listed above, Illinois hosts a number of strong regional and community banks that may offer better personalized service for owner-operated businesses. Look at the bank's office count — institutions with 5–50 branches are usually positioned as community banks, while larger numbers indicate regional or national reach. The Total assets column above gives a rough sense of the institution's scale.

How CheckCraft helps you write a check at any Illinois bank

Click any bank in the table above to see a guide tailored to that institution's check format. Each guide includes a printable check layout, a step-by-step writing walkthrough, MICR line guidance, and answers to the most common questions about that bank's business checks. For the curated major banks marked with a star (★), the guide includes the bank's real routing-number table by region; for other banks, the guide includes an illustrative MICR line and instructs you to copy your real routing/account numbers from your physical check.

You can also use the live online check writer to fill in a printable check on screen — just pick your bank, enter the payee and amount, and CheckCraft formats the written line in the formal "and 00/100" form your bank expects.