(b) If a lump sum payment is ordered by the court, such lump sum shall be calculated on the basis of the present value of remaining periodic payments, or portions thereof, that are converted into a lump sum payment. Unless specifically waived by all parties, the annuity contract executed pursuant to section five thousand forty-two of this article shall contain a provision authorizing such a lump sum payment if such payment is approved pursuant to this section. The remaining future periodic payments, if any, shall be reduced accordingly. For the purposes of this section, present value shall be calculated based on the interest rate and mortality assumptions at the time such a lump sum payment is made as determined by the insurer who has provided the annuity contract, in accordance with regulations issued by the superintendent of financial services.