Installment Payments Installment Payments (G.S. 105-228.5(f)) Insurers, Article 65 corporations, health maintenance organizations, and self-insurers that have a premium tax liability, not including the additional local fire and lightning tax, of ten thousand dollars ($10,000) or more for business done in North Carolina during the immediately preceding year must remit three equal installments with each installment equal to at least thirty-three and one-third percent (33 1/3%) of the premium tax liability incurred in the immediately preceding taxable year. The due dates are April 15, June 15, and October 15 of each year. Any insurer, corporation, self-insurer, or organization required to make premium tax installments, must also make installment payments of the Insurance Regulatory Charge. The same percentage and due date guidelines applicable to estimated installment payments of premium tax must be used in calculating and paying the insurance regulatory charge. Captive insurance companies are not required to make installment payments of tax due. The balance of premium tax and insurance regulatory charge due is remitted by the following March 15 along with the annual tax return. The Secretary may permit an insurance company to pay less than the required installment amount when the insurer reasonably believes that the total estimated payments made for the current year will exceed the total anticipated tax liability for the year. An underpayment of an installment payment shall bear interest.