15-31-502. Assessment and payment of tax -- estimated tax payment -- amount of required installments. (1) All taxpayers shall compute the amount of tax payable under this chapter and shall remit the amount to the department of revenue on or before the 15th day of the 5th month following the close of the taxable period.
     (2) (a) Each corporation shall make estimated tax payments if its annual estimated tax is $5,000 or more. The estimated payments must be made in installments, as follows, if the $5,000 threshold is met or exceeded:
     (i) For a corporation taxed on a calendar-year basis:
     For the following required installments the due date is:
     1st........April 15
     2nd........June 15
     3rd........September 15
     4th........December 15
     (ii) For a corporation taxed on a fiscal-year basis:
     For the following required installments the due date is:
     1st........15th day of the 4th month
     2nd........15th day of the 6th month
     3rd........15th day of the 9th month
     4th........15th day of the 12th month
     (b) Except as provided in 15-31-510, the amount of any required installment is 25% of the required annual payment. The required annual payment is the lesser of:
     (i) 80% of the tax shown on the return for the taxable year or, if a return is not filed, 80% of the tax for that year; or
     (ii) 100% of the tax shown on the return of the corporation for the preceding taxable year if the preceding taxable year was a period of 12 months and if the corporation filed a return for that year.
     (3) The application of this section to taxable years of less than 12 months must be in accordance with rules adopted by the department.
     (4) At the election of the corporation, any installment of the estimated tax may be paid before the date prescribed for its payment.

     History: En. Sec. 5, Ch. 79, L. 1917; re-en. Sec. 2300, R.C.M. 1921; amd. Sec. 2, Ch. 146, L. 1923; re-en. Sec. 2300, R.C.M. 1935; amd. Sec. 1, Ch. 209, L. 1945; amd. Sec. 1, Ch. 102, L. 1961; amd. Sec. 4, Ch. 186, L. 1963; amd. Sec. 1, Ch. 324, L. 1969; amd. Sec. 67, Ch. 405, L. 1973; R.C.M. 1947, 84-1505(1); amd. Sec. 4, Ch. 634, L. 1979; amd. Sec. 1, Ch. 182, L. 1981; amd. Sec. 2, Ch. 9, Sp. L. June 1989; amd. Sec. 1, Ch. 92, L. 1993.