RSA 77-E:6 — Payments Due With Returns. –

I. All business enterprises required under RSA 77-E:5, II to make payments of estimated tax shall make such payments in installments as follows: 25 percent is due and payable on the fifteenth day of the fourth month of the subsequent taxable year; 25 percent is due and payable on the fifteenth day of the sixth month of the subsequent taxable year; 25 percent is due and payable on the fifteenth day of the ninth month of the subsequent taxable year; and 25 percent is due and payable on the fifteenth day of the twelfth month of the subsequent taxable year.
II. If the return required by RSA 77-E:5, I shows an amount to be due, such amount is due and payable on the prescribed payment date. If such return shows an overpayment of the tax due, the commissioner shall refund or credit the overpayment to the business enterprise in accordance with RSA 21-J:28-a, except that:
(a) For taxable periods ending on or after December 31, 2022 a credit shall only be allowed in an amount up to 500 percent of the total tax liability for the taxable period and the remainder of the overpayment shall be refunded;
(b) For taxable periods ending on or after December 31, 2029 a credit shall only be allowed in an amount up to 250 percent of the total tax liability for the taxable period and the remainder of the overpayment shall be refunded; and
(c) For taxable periods ending on or after December 31, 2031 a credit shall only be allowed in an amount up to 100 percent of the total tax liability for the taxable period and the remainder of the overpayment shall be refunded.