Skip to main content
All CollectionsPayrollState Taxes
Illinois Payroll Guide
Illinois Payroll Guide

Illinois Payroll Guide

Isabelle Talkington avatar
Written by Isabelle Talkington
Updated over 2 months ago

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.

Third-Party Access (TPA)

Linking us as your third-party administrator will ensure we are able to complete the quarterly filings and amendments (if applicable) in a timely manner.

Complete a copy of the IL Power of Attorney (POA) form required by the Illinois Department of Employment Security.

When you have that form filled out and signed, you have two options:

Option A

  1. Log in to https://mytax.illinois.gov/_/.

  2. Select Online Upload.

  3. Select Full Access to view and manage

    • UI Employer Contribution Report

    • Rate Notice

Option B

  1. Return the signed POA form via email to [email protected]

  2. Toast will request TPA access by uploading the signed POA form to the agency website.

Did this answer your question?