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This document is a tax return form for small business corporations in Illinois, designed to report base income or loss, and calculate the Illinois replacement tax for the fiscal year.
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How to fill out form il-1120-st

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How to fill out Form IL-1120-ST

01
Begin with the heading of the form, ensuring it is clearly labeled 'IL-1120-ST'.
02
Provide your business's name and address in the designated fields.
03
Fill in your federal employer identification number (EIN).
04
Indicate the tax year by marking the appropriate box.
05
Complete the income section by entering total sales and other income.
06
Deduct allowable business expenses in the expenses section.
07
Calculate the net income by subtracting expenses from total income.
08
Enter any credits or payments from previous years, if applicable.
09
Sign and date the form to verify that the information provided is accurate.
10
Submit the form to the Illinois Department of Revenue by the deadline.

Who needs Form IL-1120-ST?

01
Businesses operating as S corporations in Illinois that meet specific income thresholds.
02
Corporations that want to file a shorter and simpler state tax return.
03
Qualified small corporations whose income does not exceed the stipulated limits.
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You must file Form IL-1120-ST if you are a small business corporation (“S corporation”), as defined in Internal Revenue Code (IRC) Section 1361(a), that • has net income or loss as defined under the Illinois Income Tax Act (IITA); or • is qualified to do business in the state of Illinois and is required to file federal
Illinois Tax Rates, Collections, and Burdens 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.
Purpose of Form Use Form 1120, U.S. Corporation Income Tax Return, to report the income, gains, losses, deductions, credits, and to figure the income tax liability of a corporation.
Illinois Residents You must file an Illinois income tax return if: You were required to file a federal return, or. You were not required to file a federal return but your Illinois income exceeds your exemption allowance.
You must file Form IL-1120-ST if you are a small business corporation (“S corporation”), as defined in Internal Revenue Code (IRC) Section 1361(a), that • has net income or loss as defined under the Illinois Income Tax Act (IITA); or • is qualified to do business in the state of Illinois and is required to file federal

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Form IL-1120-ST is a state tax return form used by small businesses in Illinois, specifically S corporations, to report their income, deductions, and calculate their state tax liability.
S corporations that are doing business in Illinois or have income sourced from Illinois are required to file Form IL-1120-ST.
To fill out Form IL-1120-ST, businesses need to provide their identification information, report their income and deductions, calculate tax due, and include any applicable schedules. Instructions for completing each section are provided in the form's accompanying guidelines.
The purpose of Form IL-1120-ST is to allow S corporations to accurately report their income and tax liability to the state of Illinois, ensuring compliance with state tax laws.
Form IL-1120-ST requires businesses to report their total income, deductions, tax credits, and any other relevant financial information, along with the tax calculation for the current tax year.
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