A. Every insurance company transacting business in this state whose premium tax, paid with respect to the previous calendar year's premiums, was One Thousand Dollars ($1,000.00) or more, shall make an estimate each year as provided herein and remit with each estimate a prepayment of its annual premium tax for the current calendar year equal to one-fourth (1/4) of its annual premium tax paid with respect to the previous calendar year's premiums. Estimates, with remittance, shall be made on or before April 15, June 15, September 15 and December 15, respectively.

B. All sums prepaid by an insurance company shall be allowed as credits against its annual return for premium tax payable on or before the first day of March. If sums prepaid exceed the insurance company's annual premium tax payable on or before the first day of March, the excess shall be refunded or shall be allowed as credits against subsequent prepayments of the tax as the insurance company shall elect on the annual return for premium tax filed for the year by the insurance company with respect to which such excess prepayments were made. Provided, in the case of an insurance company which has made prepayments of its premium tax in excess of its annual premium tax payable, the part of the excess prepayments as has not been credited against subsequent prepayments of the tax shall be refunded to the insurance company upon application within one hundred eighty (180) days after application is made.