ILLINOIS Tax Forms and Instructions
Below are the relevant links for IL State Tax information.
Illinois State Mandate The threshold is 10 or more Illinois individual income tax returns filed in the prior tax filing season.



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
    PO Box 1040
    Galesburg IL 61402-1040

  • 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:
    Each electronic IL-1040 return requires a Form IL-8453, Illinois Income Tax Electronic Filing Declaration, as the non-electronic portion of the accepted return. This declaration must be signed and given to the taxpayer along with their IL-1040 copy and any associated supporting documents, out-of-state returns, and Form IL-1310, Statement of Person Claiming Refund Due a Deceased Taxpayer (if filing an IL-1040 return on behalf of a deceased taxpayer)].
Federal Tax Information