Home / Tax Resources / State And Federal / Efile-Illinois-Tax-Return Efile Illinois State Tax Returns Start For Free Illinois State Tax Filing Information It's easy to prepare and efile your Illinois state tax return in eSmart Tax. Our tax preparation platform will automatically transfer the basic data that you entered on your federal tax return forms to your Illinois state tax return. Our step-by-step online interview process will help you complete the additional forms required by the Illinois department of Revenue for your IL state taxes. You can prepare and efile your full-year resident Illinois state tax return and your federal tax return at the same time! The regular due date for filing your Illinois state taxes is April 15. Find information about Illinois state tax forms, state tax filing instructions, and government information below. eSmart Tax supports the following Illinois Tax Forms (Click here to download Illinois tax forms) Illinois Form 1040 Individual Income Tax Return Illinois Form 1040-V Payment Voucher for Individual Income Tax Illinois 1040 Schedule CR Credit for Tax Paid to Other States Liberty eSpecial: $50 Off Tax Prep! State IL Website and Contacts State Website http://www.revenue.state.il.us/Individuals/ Taxpayer Assistance: (800) 732-8866 TTY/TDD: (800) 544-5304 Check Refund Status Online: http://www.revenue.state.il.us/Individuals/Refunds.htm Special Processing Type: Availability: State-only tax return: Supported Decedent Return: Not Supported Return with foreign address: Supported State Return Type Residency: Return Type: Also Attach: Status: Resident IL-1040 N/A Available Resident (Short) IL-1040 N/A AvailableFile Schedule NR along with Form IL-1040 Part-Year IL-1040 N/A AvailableFile Schedule NR along with Form IL-1040 State IL Amount Owe Payment Option You have the following options to pay your tax: Mail payment to: Illinois Department of Revenue Springfield, IL 62726-0001. Note: Make your check or money order payable to the "Illinois Department of Revenue" (not IRS). Write your Social Security number, and your spouse's Social Security number if filing jointly, in the lower left corner of your payment. Send e-payment through state website. Send credit card payment through third-party website. PIN Availability: Type: Notes: Supported State assigned N/A State IL Overpayment Option You have the following options: Apply your refund amount to next year's tax payment. Contribute your refund amount to charity. Receive your refund by check through mail. Receive your refund by direct deposit to your bank account.