A. In the case of any underpayment of the estimated tax payment required in Section 2385.9 of this title, there shall be added to the amount of the underpayment interest thereon at an annual rate of twenty percent (20%) for the period of the underpayment.

B. As used in subsection A of this section, the amount of the underpayment shall be the excess of the required installment over the amount paid on or before the due date of the installment. The period of underpayment shall run from the due date of the required installment to the earlier of the fifteenth day of the fourth month, or for corporations, the fifteenth day of the third month, following the close of the taxable year or the date on which the required installment is paid.

C. No addition to tax shall be imposed under subsection A of this section if the tax shown on the return for the taxable year is less than One Thousand Dollars ($1,000.00) or if the taxpayer was an Oklahoma resident throughout the preceding taxable year of twelve (12) months and did not have any liability for tax for the preceding taxable year.

Added by Laws 1965, c. 530, § 2, emerg. eff. July 24, 1965. Renumbered from § 2342 of this title by Laws 1971, c. 137, § 32, emerg. eff. May 11, 1971. Amended by Laws 1971, p. 1041, H.J.R. No. 1026, § 4, emerg. eff. June 22, 1971; Laws 1972, c. 252, § 5, emerg. eff. April 7, 1972; Laws 1986, c. 218, § 27, emerg. eff. June 9, 1986; Laws 1988, c. 87, § 4, operative July 1, 1988; Laws 1996, c. 42, § 1, eff. July 1, 1996; Laws 2000, c. 314, § 23, eff. July 1, 2000.