The Illinois Department of Revenue is urging taxpayers to file their 2025 state individual income tax returns as soon as possible ahead of the April 15 deadline, according to an April 7 announcement. The department recommends avoiding last-minute mailing delays, especially in light of recent changes by the United States Postal Service that could affect postmark dates.
This reminder comes as many taxpayers prepare for the annual filing period. Filing early can help avoid penalties and ensure refunds are processed quickly. The department highlights that electronic filing remains the fastest and most reliable option.
“Filing electronically is still the fastest and most reliable way to get your return processed,” said David Harris, Director of the Illinois Department of Revenue. “If you are expecting a refund, choosing direct deposit will help you receive it as quickly as possible. My Tax Illinois makes the process simple, guiding you step by step while helping to reduce errors.” Harris also warned about potential issues with mailing returns this year: “Mailing your return at the last minute is a real risk this year,” he said. “Because of changes to USPS postmark procedures, the date on your envelope may not reflect when you dropped it off. Filing electronically or mailing well in advance of the deadline can help you avoid unnecessary penalties and give you peace of mind.”
The department received over 6.3 million IL-1040 returns in 2025, with more than 91 percent filed electronically. Taxpayers who file error-free electronic returns can expect refunds via direct deposit within about four weeks.
Those unable to meet the April 15 deadline automatically receive a six-month extension for filing but must pay any taxes owed by April 15 to avoid penalties and interest. Assistance is available through IDOR’s helplines, which will offer extended hours on April 14 and April 15.
The Illinois Department of Revenue works to foster an inclusive environment that values diversity and equity for employees and customers, as stated on its official site. The agency focuses on fairly administering state tax laws and efficiently collecting revenues while providing accurate information according to its official website. It serves as a state agency dedicated to promoting diversity in its operations according to its official site, oversees collection of state taxes while delivering reliable financial information according to its official website, and operates within state taxation and revenue management as detailed on its official website.
For up-to-date forms or further instructions for this tax season, taxpayers are encouraged to visit tax.illinois.gov.
