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Page 1 of 4. IL-1120 (R-12/17). Illinois Department of Revenue. 2017 Form IL-1120. Corporation Income and Replacement Tax Return. See When should I file ?
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How to fill out il-1120

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How to fill out il-1120

01
Gather all necessary financial documents for your business.
02
Complete the IL-1120 form by providing accurate information about your business, such as the name, address, and federal employer identification number (FEIN).
03
Fill out Schedule B, which includes details about corporate income and deductions.
04
Include any additional schedules or attachments as required.
05
Double-check all provided information and calculations to ensure accuracy.
06
Submit the completed IL-1120 form, along with any required supporting documents, to the appropriate tax authority.

Who needs il-1120?

01
Corporations operating in the state of Illinois are required to file the IL-1120 form.
02
This form is generally used by C corporations, S corporations, and limited liability companies (LLCs) taxed as corporations.
03
Small businesses, large corporations, and even foreign corporations with business activities in Illinois may need to file the IL-1120.
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il-1120 is the Illinois Business Income Tax Return form that businesses must file to report their income, deductions, and credits.
Corporations, S corporations, partnerships, and other entities doing business in Illinois are required to file il-1120.
To fill out il-1120, businesses need to report their income, deductions, credits, and other relevant information as outlined in the form instructions.
The purpose of il-1120 is to calculate the business income tax liability for entities doing business in Illinois.
Businesses must report their income, deductions, credits, and any other relevant financial information on il-1120.
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