ILLINOIS Tax Forms and Instructions
Below are the relevant links for IL State Tax information.
Illinois State Mandate Paid preparers who file more than 10 Illinois individual income tax returns must file those returns electronically. Form IL-8948, Electronic Filing Opt-Out Declaration, may be used by preparers to remain in compliance when a client refuses to allow his or her return to be filed electronically. ERO retains Form IL-8453 for at least three years.



ILLINOIS Tax Forms and Instructions Information
Online Credit Card Payments
  • Offical Payments
    Or call 1-800-2PAY-TAX (Offical payments charges a nominal fee for this service)(Use Jurisdiction Code 2000 for Individual and Jurisdiction Code 2006 for Business Taxes)
Mailing Addresses
  • Return Mailing Address:
    ILLINOIS DEPARTMENT OF REVENUE

    SPRINGFIELD IL 62719-0001

  • Return Mailing Address without Refund:
    ILLINOIS DEPARTMENT OF REVENUE

    SPRINGFIELD IL 62726-0001

  • Estimates Mailing Address:
    Illinois Department of Revenue

    Springfield, IL 62736 0001

  • Amended Return Mailing Address:
    Illinois Department of Revenue
    P.O. Box 19007
    Springfield, IL 62794-9007

  • Extension Mailing Address:


    Illinois Department of Revenue
    P.O. Box 19005
    Springfield IL 62794-9005

  • Electronic Filing:
    The Illinois e-file program: ? Illinois only supports electronic filing in the IRS? Modernized e-File (MeF) format. Illinois returns may be transmitted to the IRS as linked (fed/state) or unlinked (state-only or standalone) returns. ? Supports filing of part-year and nonresident returns.
Federal Tax Information