For Existing Illinois Businesses:
If you already have access to the Illinois Department of Revenue website, and have a withholding tax ID number, please STOP, and simply provide us with the data requested in the "Give us your Info" section of the Illinois Taxes document. If you have access to the Illinois Department of Revenue website, but do not have a withholding tax ID, please log into your Illinois Department of Revenue account and apply for access to a withholding ID. If you have any questions, please call the Illinois Department of Revenue directly at 1-(800) 732-8866.
- The Department of Revenue will issue you an Illinois income tax withholding account. The account number they provide you with will include your EIN, and you can find it on your Illinois Withholding Income Tax Return (IL-941).
- Your Unemployment account number and your Illinois Unemployment Contribution Rate will be on the Notice of Contribution Rate that you receive from the Illinois Department of Employment Security (IDES) annually. It is important to note that your unemployment tax number is NOT the same as your FEIN. It ranges from 0.55% to 7.35%, with a wage base of $12,960.
For New Illinois Businesses:
Please follow the steps below to register your business with the Illinois Department of Revenue. Unless these steps are followed in their entirety, OnPay will be unable to file and pay your Illinois Department of Revenue taxes.
Income tax withholding
- Register with the Illinois Department of Revenue online and enter the information that they request.
- You'll be able to register using your Federal EIN. Your account number will include your Federal EIN.
Most companies are liable for state unemployment if they pay at least $1,500 in wages in a single calendar quarter or employed one or more persons for 20 weeks in a given calendar year. For more information on when your company is liable for unemployment check with the IDES online.
- Register your business online with Illinois Taxnet.
- You'll instantly be issued an Unemployment Account Number in the format of Example: 1234567-8 or 1234567. Again, It is important to note that your unemployment tax number is NOT the same as your FEIN. The last digit of your Unemployment number is called the check digit and the department will often omit it from correspondence. If you don't receive your Unemployment ID, please call the agency at (800)247-4984 to request it.
- The unemployment rate for new employers varies by industry, but is generally between 3.45%–3.65%, which includes the 0.55% Fund Builder Rate.
**For more detailed information on taxes in Illinois, check out our Illinois payroll calculator.**