Illinois Department of Revenue – Withholding Tax
Illinois Department of Employment Security – Unemployment tax
Add to existing company setup
Submit a request to your service team to add IL (withholding) and/or ILSUI (unemployment) to your company setup. Please include the below with your request:
- Withholding – Withholding account number and Deposit Frequency. If you’re unsure of your deposit frequency or account number you can call the agency at 217-782-3336.
- Unemployment – Account Number and Tax rate. This can be found on a Tax Rate Notice or the Quarterly contribution report. If you’re unsure of your tax rate or account number, you can call the agency at 800-247-4984.
- Power of Attorney- POA is required, please obtain the prefilled form from your client service representative.
Register a new company
Illinois Department of Revenue
Register online at https://mytax.illinois.gov/_/#1 by selecting the Registration icon at the top right of the page. Please follow the prompts. You will receive your account number immediately.
Illinois Department of Employment Security
Register online at https://taxnet.ides.state.il.us/login/CreateMembership.aspx and create an account. You will receive your account number and rate upon completion of the online registration.
Third Party Registration and/or Power of Attorney Instructions
Power of Attorney is required, please obtain the prefilled form from your client service representative.