Payroll tax account closure in Illinois
Illinois keeps expecting filings on every account type you ever registered. Close withholding on Line B of the final IL-941, and the IDES account separately.
2 agencies · Verified 2026-08-03
Illinois
Illinois state tax filings.
Which agencies Illinois uses, which forms they take, what they cost, and the specific things Illinois does differently from its neighbours. Everything below is checked against the agency's own material and carries the date it was checked.
Who you deal with in Illinois
Illinois Department of Revenue
Withholding income tax and other business tax registrations
MyTax Illinois
Illinois Department of Employment Security
Unemployment insurance employer account
MyTax Illinois
2 separate agencies, on 2 separate systems. In almost every state, doing something with one of them does nothing to the others.
What Illinois does differently
- Every account type you registered keeps expecting filings. Illinois continues to expect returns across sales and use, withholding, and income and replacement tax independently. A business that registered for three and closes one is still filing for two, and the notices come from an agency that thinks you are trading.
- Thirty days from start-up, not from first payroll. Illinois ties the Employment Security registration deadline to when the business started rather than to when you first paid anyone, which is earlier than most states measure from.
Filings we handle in Illinois
Payroll tax registration in Illinois
Illinois wants IDES registration within 30 days of start-up. Two forms at two agencies: REG-1 with Revenue and REG-UI-1 with Employment Security.
2 agencies · Verified 2026-08-03