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Registering Your Business
If I am just starting my business, what do I do to register?
Register with IDOR electronically using MyTax Illinois:
If you are not already registered, select “Register a New Business (Form REG-1)” and complete the registration
application.
If you choose to register using the paper application, complete and sign Form REG-1, Illinois Business Registration
Application, allow 6-8 weeks for processing, and submit it via email, fax, or mail to:
CENTRAL REGISTRATION DIVISION 3-222
ILLINOIS DEPARTMENT OF REVENUE
PO BOX 19030
SPRINGFIELD IL 62794-9030
Fax: 217 785-6013
Email: rev.crd@illinois.gov
For additional information about registering with IDOR and for registration forms, such as the Form REG-1, Illinois
Business Registration Application, visit the registration section of our website.
Note: When completing Form REG-1, Illinois Business Registration Application, ensure that you check the box
labeled “Chicago Soft Drink Tax” when registering in MyTax Illinois or “Soft drinks (other than fountain soft drinks)
in Chicago” when registering by mail or fax using the Form REG-1 found on our website.
For detailed information about registering your account, see Publication 113, Retailer’s Overview of Sales and Use
Tax, Prepaid Wireless E911 Surcharge, and Illinois Telecommunications Access Corporation (ITAC) Assessment.
How do I activate a MyTax Illinois logon?
Once your business is registered, you can activate your MyTax Illinois logon. Please allow 24 hours from your
registration confirmation email before activating a logon for MyTax Illinois. To activate a logon for business,
select the taxpayer ID type. You can use one of the following options to validate the activation:
• Owner/Officer or Responsible Party Social Security Number
• PIN previously issued by IDOR (used for certain electronic filing methods, such as Webfile and third-party tax
software, separate from MyTax Illinois)
• Account Activity validation
This activation process is to help ensure only individuals who are authorized by their organization are allowed to
gain access to a business’s tax information.
Once you have activated your MyTax Illinois logon, if you are a Corporation, S-Corp, Partnership, or LLC
organization type and are registered for other tax accounts, you can register for the ST-14 or other new tax types
through your existing MyTax Illinois logon account, by selecting “More…” and then selecting “Register for New Tax
Accounts.”
Sole proprietorships can only register for new tax accounts by selecting “Register a New Business (Form REG-1)”
and completing Form REG-1, the Illinois Business Registration Application, on the MyTax Illinois home screen.
How will I know that I have successfully registered?
We will issue you a Certificate of Registration (Certificate) when you register for the Retailers’ Occupation Tax
(“sales tax”) and Use tax. You are required to have this Certificate if you engage in the business of selling tangible
personal property. The Certificate lists your Sales and Use Tax Account ID, your business name, address, the
effective date, the tax for which you are registered, and the date the Certificate will expire. You will not receive a
separate Certificate of Registration for your ST-14 account registration.
MyTax Illinois is the primary method you should use to obtain and print or download a copy of your Certificate of
Registration. From your MyTax Illinois logon, the Certificate of Registration is located by selecting “View more
account options” in the ST-1 Sales/Use Tax panel and then “View Account Letters” in the “Letters and Messages”
panel. If you are unable to print or download a copy of your business’s Certificate of Registration, you can also
contact our Central Registration Division by email at rev.crd@illinois.gov or phone at 217 785-3707 to request a
paper copy be mailed to you.
PUB-116 (R-05/24) Page 4 of 9
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