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 Form IL 1120 ST 2020

State of Illinois Income Tax 2020-2025 Form

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What is the Form IL 1120 ST

The Form IL 1120 ST is a state income tax return specifically designed for S corporations operating in Illinois. This form is essential for reporting income, deductions, and credits for S corporations that have elected to be taxed under Subchapter S of the Internal Revenue Code. It allows the corporation to calculate its state tax liability accurately and ensures compliance with Illinois tax laws.

How to use the Form IL 1120 ST

To use the Form IL 1120 ST, businesses must first gather all necessary financial documents, including income statements, deduction records, and any applicable credits. The form must be completed accurately, reflecting the corporation's financial activities for the tax year. After filling out the form, it should be submitted to the Illinois Department of Revenue, either electronically or via mail, depending on the corporation's preference.

Steps to complete the Form IL 1120 ST

Completing the Form IL 1120 ST involves several key steps:

  1. Gather necessary financial documents, including income statements and deduction records.
  2. Fill out the form accurately, ensuring all required sections are completed.
  3. Calculate total income, deductions, and credits to determine the tax liability.
  4. Review the completed form for accuracy and completeness.
  5. Submit the form electronically or by mail to the Illinois Department of Revenue.

Filing Deadlines / Important Dates

The filing deadline for the Form IL 1120 ST typically aligns with the federal tax return deadline for S corporations. Generally, this means the form is due on the 15th day of the third month following the end of the corporation's tax year. For corporations operating on a calendar year, this means the form is due by March 15. It's important to stay informed about any changes to these deadlines to avoid penalties.

Legal use of the Form IL 1120 ST

The Form IL 1120 ST is legally binding when completed and submitted according to Illinois tax laws. Proper execution of the form ensures that the S corporation complies with state tax regulations. Failure to file or inaccuracies in the form can result in penalties, interest, and potential legal issues. Therefore, it is crucial for corporations to understand the legal implications of their filings.

Required Documents

When completing the Form IL 1120 ST, several documents are required to ensure accurate reporting. These include:

  • Income statements detailing revenue generated during the tax year.
  • Records of deductions, such as business expenses and credits.
  • Previous tax returns, if applicable, for reference.
  • Any supporting documentation for claimed credits or deductions.

Who Issues the Form

The Form IL 1120 ST is issued by the Illinois Department of Revenue. This state agency is responsible for administering tax laws and collecting taxes in Illinois. The department provides guidance and resources to assist S corporations in completing their tax returns accurately and in compliance with state regulations.

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