State tax registration
Illinois Payroll Tax Registration
Where to register, how long it takes, and what to send us.
State income tax withholding
Withholding account (MyTax Illinois, Form REG-1)
Illinois Department of Revenue (IDOR)
- You'll receive:
- An Illinois Account ID, usually your federal EIN plus a 3-digit sequence number (typically -000), confirmed by email.
- Send Unify:
- Your Illinois Account ID.
State unemployment insurance
Unemployment insurance account (MyTax Illinois)
Illinois Department of Employment Security (IDES)
- You'll receive:
- An IDES employer account number. New employers pay 3.35% (3.45% for administrative support and waste management businesses) on the first $14,250 of each employee's wages in 2026.
- Send Unify:
- Your IDES account number and your rate notice.
Other state program
State retirement savings program
My Illinois Savings
- You'll receive:
- If you had 5 or more employees in every quarter of last year, have been in business at least 2 years, and don't offer a retirement plan, you must register and run payroll deductions. If you offer a plan, you certify an exemption.
- Send Unify:
- Nothing, unless you register. Then let us know so we can set up the payroll deductions.
All states
Last verified September 30, 2026. Broken link? Email support@unifypayroll.com.