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Illinois has a flat 4.95 percent individual income tax rate. Illinois has a 9.5 percent corporate income tax rate. Illinois also has a 6.25 percent state sales tax rate and an average combined state and local sales tax rate of 8.86 percent.
You must register with the Illinois Department of Revenue (IDOR) if you conduct business in Illinois or with Illinois customers. This includes sole proprietors (i.e., individual or husband/wife/civil union), exempt organizations, or government agencies, that withhold Illinois Income Tax for Illinois employees.
Can I file this return and pay the tax due electronically? Yes, you can use MyTax Illinois at mytax.illinois.gov to file your Form ST-1, and, if applicable, Form ST-2. MyTax Illinois also allows for electronic payment of any tax due. You can also file Form ST-1 using a direct file service through an outside vendor.
The REG-UI-1 form serves as a vital document for businesses operating in Illinois to register for unemployment insurance. This form ensures that employers fulfill their tax responsibilities under the Illinois Unemployment Insurance Act.
The state of Illinois expects you to cover 90% of your total tax liability for the year through a combination of withholding and estimated payments. Similar to federal rules, Illinois also accepts 100% of your prior years tax liability as a safe harbor (110% if your adjusted gross income was more than $150,000).

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Automatic Illinois six-month extension We automatically grant you a six-month extension of time to file your tax return. For calendar year filers, the filing date is automatically extended to October 15. You are not required to file Form IL-505-I to obtain this automatic extension.
REG-1 Illinois Business Registration Application. Did you know you may be able to file this form online? Filing online is quick and easy! Click here to go to MyTax Illinois to file your application online.

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