IL-505-I Automatic Extension Payment Filing Instructions
This document outlines the instructions for filing Form IL-505-I, the Automatic Extension Payment for individuals. It provides information on who must file, how to calculate tentatives taxes and where to submit the payment. Understanding this form ensures you meet your Illinois tax obligations timely.
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How do I fill this out?
To fill out Form IL-505-I, first gather your tax documents to estimate your tentative tax liability. Next, complete the Tax Payment Worksheet to determine the amount due. Finally, submit the form with your payment by the specified due date.

How to fill out the IL-505-I Automatic Extension Payment Filing Instructions?
1
Gather necessary tax documents.
2
Complete the Tax Payment Worksheet.
3
Determine the amount of tentative tax due.
4
Fill out Form IL-505-I.
5
Submit the form with payment by the due date.
Who needs the IL-505-I Automatic Extension Payment Filing Instructions?
1
Individuals unable to file their tax return by the due date need this form to avoid penalties.
2
Taxpayers who estimate they owe additional taxes to the state should file to remit payments.
3
Anyone who prefers to pay their taxes by check rather than electronically will require this form.
4
Those granted an IRS extension but who owe state taxes must use this form for proper filing.
5
Individuals seeking to avoid late payment penalties and interest charges should file IL-505-I.
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What are the instructions for submitting this form?
To submit Form IL-505-I, mail it along with your payment to the Illinois Department of Revenue at P.O. Box 19005, Springfield, IL 62794-9005. Include your Social Security number, tax year, and 'IL-505-I' on your check or money order. Ensure you consult the latest guidelines to confirm the address and method of payment prior to submission.
What are the important dates for this form in 2024 and 2025?
In 2024, the due date for filing the IL-505-I will be April 15. If you are granted an extension, ensure payments are made promptly to avoid penalties. For 2025, dates will likely remain the same, but always check for any updates.

What is the purpose of this form?
The purpose of Form IL-505-I is to provide Illinois taxpayers with a mechanism to make an extension payment if they cannot meet the tax filing deadline. It allows taxpayers to estimate and pay any tentative taxes owed, thereby avoiding penalties associated with late filings. Understanding and correctly filing this form helps ensure compliance with Illinois tax laws.

Tell me about this form and its components and fields line-by-line.

- 1. Social Security Number: Required for identifying the taxpayer and processing the payment.
- 2. Tax Year: Specifies the tax year for which the payment is being made.
- 3. Tentative Tax Due: The amount of tentative tax determined through the worksheet.
- 4. Payment Method: Indicates how the payment will be submitted (e.g. check or money order).
- 5. Signature: Requires taxpayer's signature to confirm the accuracy of provided information.
What happens if I fail to submit this form?
If Form IL-505-I is not submitted, taxpayers may face penalties and interest on unpaid taxes. This can complicate future tax filings and increase overall liability.
- Late Filing Penalty: A penalty incurred for not submitting the return by the applicable due date.
- Interest Charges: Interest accumulates on unpaid tax from the day after the original due date until paid.
- Increased Tax Obligation: Failure to file may result in additional amounts owed if taxes remain unpaid.
How do I know when to use this form?

- 1. Filing Extension: Used to request an extension on filing while remitting estimated taxes.
- 2. Tentative Payment Calculation: Allows calculation of tentative taxes owed before filing the actual return.
- 3. Payment Submission: Utilized when making payment through traditional methods rather than electronic options.
Frequently Asked Questions
What is Form IL-505-I?
Form IL-505-I is used for making an automatic extension payment for individuals who cannot file their tax returns by the due date.
How can I edit the IL-505-I PDF?
You can easily edit the PDF using PrintFriendly’s editing tools, allowing you to modify any part of the document.
When is the due date for Form IL-505-I?
The due date for submitting Form IL-505-I aligns with the original due date of your annual tax return.
Can I file Form IL-505-I electronically?
No, Form IL-505-I must be submitted via mail with your payment; electronic payments should be made through other specified means.
What happens if I don’t file this form?
Failure to file can result in penalties and interest on the amount owed.
Where can I find assistance for filling out this form?
You can visit the Illinois Department of Revenue website or contact their assistance offices for help.
What if I need to make changes after submitting the form?
You may need to contact the Illinois Department of Revenue directly to rectify any issues post-submission.
How do I avoid penalties when filing this form?
Ensure that you file this form and submit your payment by the due date to avoid late fees.
What should I include with my Form IL-505-I?
Include your payment, and if required, attach necessary documentation or worksheets.
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