Your company's Business Tax number can be found on the Illinois Withholding Income Tax Return (IL-941) filed for previous quarters. You may also contact the DOR at (800) 732-8866. Please note: Your Taxpayer ID will be a combination of your Federal Employer Identification Number and a Sequence Number (-)
You can register electronically using MyTax Illinois, available at mytax.illinois. On the MyTax Illinois homepage, click “Register a New Business (Form REG-1).” Note that processing time for a registration application submitted through MyTax Illinois is approximately one to two business days.
Electronically - Go to our website at MyTax.illinois, scroll down to the section titled "Identity Verification", select the Identity Verification Documents link, enter your Letter ID, and follow the instructions. Note: Submitting your information electronically will result in a quicker and more secure process.
You can electronically file Forms IL-1120, Corporation Income and Replacement Tax Return; IL-1065, Partnership Replacement Tax Return; IL-1120-ST, Small Business Corporation Replacement Tax Return; IL-1041, Fiduciary Income and Replacement Tax Return; and any attachments and payments through our partnership with the ...
Account ID, FEIN, and License Numbers can be verified at MyTax Illinois by selecting the "Verify a Registered Business" link in the "Searches" panel. This system allows you to inquire whether a business is registered with the Illinois Department of Revenue and how that business is registered with IDOR.
IDOR registration: In Illinois, most businesses will need to register with the Illinois Department of Revenue (IDOR). IDOR issues Certificates of Registration or License. IDOR also licenses and registers certain retailers and businesses.
To perform an Illinois business search, use the Illinois Secretary of State's website, searching by corporation or LLC name. This search can provide key information about a company's status and history in Illinois.
Depending on your organization type, you may be required to obtain a FEIN. Some organization types, such as corporations, S corporations, partnerships, and certain LLCs, require a FEIN. Some, such as a single member LLC, may not require a FEIN if you do not have employees.
IDOR registration: In Illinois, most businesses will need to register with the Illinois Department of Revenue (IDOR). IDOR issues Certificates of Registration or License. IDOR also licenses and registers certain retailers and businesses.
How to apply for a business license in Illinois Apply online via the MyTax Illinois website. Submit your application by mail by completing and mailing a paper Form REG-1, Illinois Business Registration Application (available as a PDF on the IDOR website) to the address on the form.