Indiana Code Title 6. Taxation § 6-5.5-6-3

Sec. 3. (a) Each taxpayer subject to taxation under this article shall report and pay quarterly an estimated tax equal to twenty-five percent (25%) of the taxpayer's total estimated tax liability imposed by this article for the taxable year.  A taxpayer that uses a taxable year that ends on December 31 shall file the taxpayer's estimated quarterly financial institutions tax return and pay the tax to the department on or before April 20, June 20, September 20, and December 20 of the taxable year, without assessment or notice and demand from the department.  If a taxpayer uses a taxable year that does not end on December 31, the due dates for filing the estimated quarterly financial institutions tax return and paying the tax are on or before the twentieth day of the fourth, sixth, ninth, and twelfth months of the taxpayer's taxable year.  The department shall prescribe the manner and furnish the forms for reporting and payment.

(b) Subsection (a) is applicable only to taxpayers having a tax liability imposed under this article that exceeds two thousand five hundred dollars ($2,500) for the taxable year.

(c) If the department determines that a taxpayer's:

exceeds five thousand dollars ($5,000), the taxpayer shall pay the quarterly financial institutions taxes due by electronic fund transfer (as defined in IC 4-8.1-2-7) or by delivering in person or by overnight courier a payment by cashier's check, certified check, or money order to the department.  The transfer or payment shall be made on or before the date the tax is due.

(d) If a taxpayer's financial institutions tax payment is made by electronic fund transfer, the taxpayer is not required to file a quarterly financial institutions tax return.

(e) If the taxpayer has a taxable year that is less than twelve (12) months, the estimated payments under this section shall be adjusted in the manner prescribed by Section 6655 of the Internal Revenue Code and applicable regulations.