1. (a) Payment of estimated income tax must be made by the following:

   1. (1) A single individual whose tax liability for the year is estimated to be $500.00 or more in excess of taxes withheld from wages.
   2. (2) Married individuals whose combined tax liability for the year is estimated to be $500.00 or more in excess of taxes withheld from wages.
   3. (3) A corporation or trust whose tax liability for the year is estimated to be $500.00 or more.

2. (b) Initial payments of estimated tax should be made by:

   1. (1) Calendar-year taxpayers, no later than April 15th.
   2. (2) Fiscal-year taxpayers, by the fifteenth day of the fourth month following the beginning of the taxable year. [See: 68 O.S. § 2385.7]

Amended at 15 Ok Reg 2811, eff 6-25-98

Amended at 18 Ok Reg 2810, eff 6-25-01

Amended at 40 Ok Reg 1265, eff 8-11-23