G.S. 105-163.15

(a) In the case of any underpayment of the estimated tax by an individual, the Secretary shall assess interest in an amount determined by applying the applicable annual rate established under G.S. 105-241.21 to the amount of the underpayment for the period of the underpayment.

(b) For purposes of subsection (a), the amount of the underpayment shall be the excess of the required installment, over the amount, if any, of the installment paid on or before the due date for the installment. The period of the underpayment shall run from the due date for the installment to whichever of the following dates is the earlier: (i) the fifteenth day of the fourth month following the close of the taxable year, or (ii) with respect to any portion of the underpayment, the date on which such portion is paid. A payment of estimated tax shall be credited against unpaid required installments in the order in which such installments are required to be paid.

(c) For purposes of this section there shall be four required installments for each taxable year with the time for payment of the installments as follows:

(1) First installment - April 15 of taxable year;

(2) Second installment - June 15 of taxable year;

(3) Third installment - September 15 of taxable year; and

(4) Fourth installment - January 15 of following taxable year.

(d) Except as provided in subsection (e), the amount of any required installment shall be twenty-five percent (25%) of the required annual payment. The term "required annual payment" means the lesser of:

(1) Ninety percent (90%) of the tax shown on the return for the taxable year, or, if no return is filed, ninety percent (90%) of the tax for that year; or

(2) One hundred percent (100%) of the tax shown on the return of the individual for the preceding taxable year, if the preceding taxable year was a taxable year of 12 months and the individual filed a return for that year.

(f) No interest shall be imposed under subsection (a) if the tax shown on the return for the taxable year reduced by the tax withheld under this Article is less than the amount set in section 6654(e) of the Code or if the individual did not have any liability for tax under Part 2 of Article 4 for the preceding taxable year.

(g) For purposes of this section, the term "tax" means the tax imposed by Part 2 of Article 4 minus the credits against the tax allowed by this Chapter other than the credit allowed by this Article. The amount of the credit allowed under this Article for withheld income tax for the taxable year is considered a payment of estimated tax, and an equal part of that amount is considered to have been paid on each due date of the taxable year, unless the taxpayer establishes the dates on which all amounts were actually withheld, in which case the amounts so withheld are considered payments of estimated tax on the dates on which the amounts were actually withheld.

(h) If, on or before January 31 of the following taxable year, the taxpayer files a return for the taxable year and pays in full the amount computed on the return as payable, no interest shall be imposed under subsection (a) with respect to any underpayment of the fourth required installment for the taxable year.

(i) Notwithstanding subsections (c), (d), (e), and (h) of this section, an individual who is a farmer or fisherman for a taxable year is subject to the provisions of this subsection.

(1) One installment. - The individual is required to make only one installment payment of tax for that taxable year. This installment is due on or before January 15 of the following taxable year. The amount of the installment payment must be the lesser of:

a. Sixty-six and two-thirds percent (66 2/3%) of the tax shown on the return for the taxable year, or, if no return is filed, sixty-six and two-thirds percent (66 2/3%) of the tax for that year; or

b. One hundred percent (100%) of the tax shown on the return of the individual for the preceding taxable year, if the preceding taxable year was a taxable year of 12 months and the individual filed a return for that year.

(2) Exception. - If, on or before March 1 of the following taxable year, the taxpayer files a return for the taxable year and pays in full the amount computed on the return as payable, no interest is imposed under subsection (a) of this section with respect to any underpayment of the required installment for the taxable year.

(3) Eligibility. - An individual is a farmer or fisherman for any taxable year if the individual's gross income from farming or fishing, including oyster farming, for the taxable year is at least sixty-six and two-thirds percent (66 2/3%) of the total gross income from all sources for the taxable year, or the individual's gross income from farming or fishing, including oyster farming, shown on the return of the individual for the preceding taxable year is at least sixty-six and two-thirds percent (66 2/3%) of the total gross income from all sources shown on the return.

(j) In applying this section to a taxable year beginning on any date other than January 1, there shall be substituted, for the months specified in this section, the months that correspond thereto. This section shall be applied to taxable years of less than 12 months in accordance with rules prescribed by the Secretary.

(k) This section shall not apply to any estate or trust. (1959, c. 1259, s. 1; 1963, c. 785, ss. 3, 4; 1973, c. 476, s. 193; c. 1287, s. 7; 1977, c. 657, s. 5; c. 1114, s. 8; 1985, c. 443, s. 2; 1989, c. 692, s. 7.1; 1991 (Reg. Sess., 1992), c. 950, s. 1; 1997-109, s. 2; 1998-98, s. 71; 1998-212, s. 29A.14(h); 2000-126, s. 4; 2005-276, s. 6.37(l); 2007-491, s. 44(1)a.)