; (B) by striking paragraph (2) and inserting the following: (2) (A) Not later than June 30, 2018, the Office shall compute, and by June 30 of each succeeding year, the Office shall recompute, a schedule including a series of annual installments which provide for the liquidation of the amount described under subparagraph (B) (regardless of whether the amount is a liability or surplus) by September 30, 2055, or within 15 years, whichever is later, including interest at the rate used in the computations under this subsection. (B) The amount described in this subparagraph is the amount, as of the date on which the applicable computation or recomputation under subparagraph (A) is made, that is equal to the difference between— (i) 100 percent of the Postal Service actuarial liability as of September 30 of the preceding fiscal year; and (ii) the value of the assets of the Postal Service Retiree Health Benefits Fund as of September 30 of the preceding fiscal year. ; (C) in paragraph (3)— (i) in subparagraph (A)— (I) in clause (iii), by adding and at the end; (II) in clause (iv), by striking the semicolon at the end and inserting a period; and (III) by striking clauses (v) through (x); and (ii) in subparagraph (B)— (I) in clause (i), by striking paragraph (1) and inserting paragraph (1), except to the extent the payment would cause the value of the assets in the Fund to exceed the Postal Service actuarial liability ; and (II) in clause (ii), by striking paragraph (2)(B). and inserting paragraph (2). ; (D) by amending paragraph (4) to read as follows: (4) Computations under this subsection shall be based on— (A) economic and actuarial methods and assumptions consistent with the methods and assumptions used in determining the Postal surplus or supplemental liability under section 8348(h); and (B) any other methods and assumptions, including a health care cost trend rate, that the Director of the Office determines to be appropriate.