ARM 42.15.316. EXTENSIONS AND ESTIMATED PAYMENTS

(1) A taxpayer's tax liability and percent threshold of payment are determined as provided in ARM Title 42, chapter 17, subchapter 3. (2) If a taxpayer does not meet either of the required payment thresholds as required by 15-30-2604, MCA, late pay and late filing penalties will be applied as provided in 15-1-216, MCA. (3) Underpayment interest, as provided in 15-30-2512, MCA, accrues to the original due date of the return. Interest from and after the original due date of the return accrues as provided in 15-1-216, MCA, whether or not the time for filing the return has been extended. (4) The underpayment is calculated as provided in ARM Title 42, chapter 17, subchapter 3. (5) A six-month extension of time to file an individual income tax return is automatically allowed a taxpayer if the tax, penalty, and interest are paid when the return is filed. (6) Taxpayers who are either first time filers, or have a zero or negative taxable income for the previous year, are considered to have paid 100 percent of the previous year's tax for purposes of meeting the threshold requirements in 15-30-2604, MCA.