Individuals can file their Indiana state income taxes by mail, using INfreefile, hiring a professional tax preparer or using an approved online tax filing company, explains the Indiana Department of Revenue. They can also use the Indiana Department of Revenue's ePay service to pay their taxes online, as of 2015.
INfreefile is a free service offered by select tax preparing vendors to individuals based on their income, age, military status and their earned income tax credit eligibility, notes the Retired Indiana Public Employees Association. Each vendor has their own requirements. Those individuals who qualify can file both their federal and state taxes for free and receive a direct deposit for any tax refund.
Individuals who mail their taxes and are not including payment can send them to the Indiana Department of Revenue, P.O. Box 40, Indianapolis, IN 46206-0040, according to TurboTax. Filers including a payment should use this address: Indiana Department of Revenue, P.O. Box 7224, Indianapolis, IN 46207-7224.
Professional tax preparers who file more than 100 tax returns per year must file the returns electronically, notes CrossLink Tax Resource Center. In Indiana, qualified tax preparers use the Federal/State Electronic Filing Program, which allows them to file the federal and state returns together, according to the Indiana Department of Revenue. Individuals who prefer paper filing can complete Form IN-OPT to opt out of the electronic filing requirement.