The Indiana Department of Revenue (DOR) and the Internal Revenue Service (IRS) will open the 2018 individual income tax filing season on January 29th. The last day of tax season is scheduled for April 17th. Hoosiers can visit to see if they qualify for INfreefile. For more information, customers may visit the website at or call DOR Customer Service at 317-232-2240, Monday through Friday, 8 a.m. – 4:30 p.m. EST.