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Individual Income Tax Return
Illinois individual income tax return for full-year and part-year residents. The primary form for filing Illinois state income taxes.
Estimated Income Tax Payment
Illinois estimated income tax payment voucher for individuals making quarterly estimated tax payments.
Amended Individual Income Tax Return
Illinois amended individual income tax return for correcting previously filed IL-1040 returns.
Computation of Penalties for Individuals
Illinois form for computing penalties for underpayment of estimated individual income tax.
Automatic Extension Payment
Illinois automatic extension payment voucher for individual income tax. Used to make a payment with an extension request.
Illinois LLC Articles of Organization
Illinois Secretary of State form for forming a limited liability company.
Illinois Exemption and Earned Income Credit
Illinois schedule for claiming personal exemptions and the Illinois Earned Income Credit on the IL-1040.