A taxpayer who uses a taxable year that ends on December 31 shall file the taxpayer's estimated adjusted gross income tax returns and pay the tax to the department on or before April 20, June 20, September 20, and December 20 of the taxable year. If a taxpayer uses a taxable year that does not end on December 31, the due dates for filing estimated adjusted gross income tax returns 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 forms for such reporting and payment.
In addition, the penalty as to any underpayment of tax on an estimated return shall only be assessed on the difference between the actual amount paid by the corporation on such estimated return and twenty-five percent (25%) of the corporation's final adjusted gross income tax liability for such taxable year. A payment required to be made in the manner prescribed in subsection (f), but not paid in such a prescribed manner, shall be subject to the penalty provided in IC 6-8.1-10-2.1(b)(5).
exceeds five thousand dollars ($5,000), after the credit allowed by IC 6-3-3-2 (repealed), the corporation shall pay the estimated adjusted gross income taxes due by electronic funds transfer (as defined in IC 4-8.1-2-7) or by delivering in person or overnight by 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.
The department shall adopt guidelines and issue instructions as necessary to assist individuals in making the designations required by this subsection.
IC 6-3-4-4.1