2026 Illinois Tax Filing Season Begins Jan 26

The Illinois Department of Revenue will open the 2025 state tax filing season on January 26th, matching the federal filing kickoff set by the IRS. Residents have until April 15th to submit their state tax returns. Officials recommend using electronic filing methods and opting for direct deposit to ensure both speed and security when receiving any refunds. Electronic submissions help reduce errors and streamline the process for both taxpayers and the Department of Revenue. With the filing window approaching, Illinois residents are urged to gather relevant documents and consider electronic filing options for a smoother experience this tax season.