Illinois Income Tax Extension

How to file an Illinois Tax Extension. Points to consider when to prepare extensions.

Extension Situation
Extension Suggestion
Illinois Tax Refund

Option 1: There's no need to file an Illinois tax extension if you don't owe any taxes and aren't expecting a refund. However, to claim a refund, you must file your Illinois tax return by the deadline.

Option 2: If you don't owe Illinois income tax or expect a refund by the deadline, your approved federal extension applies to your Illinois return as well. In other words, you don't need to file a separate Illinois extension (Form IL-505-I).

Owe Illinois Taxes

Option 1: Make an online payment for your Illinois income taxes with MyTax Illinois.

Option 2: Illinois automatically grants a six-month extension to file your income tax return, giving you extra time until the October deadline. This is helpful to avoid late filing penalties if you need more time to complete your return. However, it's important to remember that this extension only applies to late filing penalties. If you owe any Illinois income tax, you still need to pay it by the original deadline to avoid interest and other penalties on unpaid taxes. You can also electronically file a federal tax extension, but this won't affect your Illinois filing requirements.

Option 3: Complete Form IL-505-I, include a Check or Money Order, and mail both to the address on Form IL-505-I. Important: Even if you filed an extension, you will still need to file your IL tax return either via eFile or by paper by the October deadline.

Illinois Income Tax Calculator
Illinois Tax Deadlines
Tax Penalties
Important: If you owe Illinois and/or IRS income taxes and do not file an IRS and Illinois tax return or extension by the Tax Due Date, you will be subject to IRS and IL late filing penalties. Estimate IRS late filing, payment penalties. In addition, if you do not pay your taxes by the Tax deadline, you will be subject to late tax payment penalties. Filing an extension on time will ONLY eliminate the late filing penalties but not the late tax payment penalties. Late filing penalties are generally higher than late payment penalties, thus file something on time even if you can't pay anything on time!
Discuss your extension questions and goals with a Taxpert for free and we will guide you through the process.