Illinois Payroll Guide – Paid

There are two required tax items you’ll need in order to get set up for payroll.

Requirement	Format	Agency
Illinois Unemployment Account Number	XXXXXXX	MyTax Illinois
Illinois Taxpayer ID Number	(XX-XXXXXXX) FEIN followed by (XXX) Sequence Number	MyTax Illinois

How to register:

Withholding Account and Taxpayer ID

New businesses must register online with MyTax Illinois. Successful registration will generate both required numbers.

Your Taxpayer ID Number (also recognized as an Illinois Department of Revenue [IDOR] Account ID Number or Illinois Business Tax number [IBT number]) usually aligns with your nine-digit (XX-XXXXXXX) Federal Employment Identification Number (EIN) followed by a three-digit (XXX) Sequence Number. The agency can be contacted by calling 1 (800) 732-8866 or (217) 782-3336. Representitives are available Monday through Friday, 8am - 5pm.

Unemployment Contribution Rate

New employers received their Unemployment Contribution Rate after successful registration on MyTax Illinois.

How to locate these numbers if you’re already registered:

Utilize your Mytax Illinois Account.
Locate your Unemployment Account Number on any previously filed Employer’s Contribution & Wage Report (Form UI-3/40).
Locate your Unemployment Account Number on the Notice of Contribution Rate sent by IDES in December each year.
Locate your Taxpayer ID Number on any previous Illinois Withholding Income Tax Return (Form IL-941).
Learn how to locate or obtain an EIN or by calling (800)247-4984.

Existing businesses switching payroll platforms can look up their contribution rate in their Mytax Illinois Account.