As of 2015, Indiana tax forms for the current tax year are available on the Indiana Department of Revenue website. Forms for both individuals and businesses are available on the site, explains IN.gov.
In addition to tax forms, the Indiana Department of Revenue offers an online payment suite for both taxes and bills, according to its website. This payment suite can be used for both owed taxes, in the case a resident owes taxes in addition to automatic deductions, and for estimated tax payments for self-employed and contractual employees. Extension payments can also be made through the website for those who have not filed their taxes by the annual deadline.