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New company registration in Illinois

Illinois Tax Agencies

  • Illinois Department of Revenue - income tax withholding
  • Illinois Department of Employment Security (IDES) - unemployment tax

Register a new company

Income tax withholding and unemployment tax

  1. Register for both income tax withholding and unemployment tax through the Illinois Department of Revenue website. Click registration and complete.
  2. For Income Tax Withholding, you’ll receive a taxpayer ID which will consist of your Federal EIN plus a Sequence Number (-XXX). You will be required to fill out the sequence number in Gusto to ensure payments are properly paid. If you are unsure about your sequence number, please reach out to the department at (800) 732-8866.
  3. For Unemployment Tax, 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. If considered liable, you'll instantly be issued an Unemployment Account Number in the format of XXXXXXX-X. The last digit of your Unemployment number is called the check digit and the department will often omit it from correspondence. Gusto does not require the final digit when entering the number in your account. 
  4. UI tax rate: The unemployment rate for new employers varies by industry, but is generally between 3.225%-3.925%, which includes the .55% Fund Builder Rate. Effective in 2019, the Fund Builder Rate will be 0.475.

Third party access to Illinois Department of Revenue 

You must grant Gusto access to your MyTax Illinois account in order for us to file and pay your Illinois withholding taxes. 

  1. Login to your MyTax Illinois account
  2. Click Logon Settings.
  3. Select Manage Additional Logons.
  4. Under "Accountants or Third Party Logons" make sure the Allow setting is set to Yes.