; or (ii) the earlier of— (I) the date that the participant has been a participant in the MyRA Program for 30 years; or (II) the date that the participant reaches age 59 1/2 ; the designated Roth IRA custodian shall provide notice to the participant that no further contributions will be accepted and that the participant may elect to have the account balance rolled over to another Roth IRA according to the rules relating to rollovers and conversions of Roth IRAs under the Internal Revenue Code of 1986. (E) Adjustment for inflation (i) In general In the case of any calendar year after 2020, the $15,000 amount in subparagraphs (C) and (D) and subsection (c)(3)(B) shall be increased by an amount equal to— (I) such dollar amount, multiplied by (II) the cost-of-living adjustment determined under section 1(f)(3) of the Internal Revenue Code of 1986 for the calendar year, determined by substituting calendar year 2019 for calendar year 2016 in subparagraph (A)(ii) thereof. (ii) Rounding If any increase determined under clause (i) is not a multiple of $50, such increase shall be rounded to the next lowest multiple of $50. (4) Designated Roth IRA custodian For purposes of this section, the designated Roth IRA custodian is the person designated by the Secretary of the Treasury to act as custodian of the Roth IRAs established on behalf of participants in the retirement savings program of such Department. (c) Retirement savings bonds For purposes of this section— (1) In general The term retirement savings bond means an interest-bearing electronic United States savings bond issued to the designated Roth IRA custodian which is available only to participants in the MyRA Program. (2) Interest rate Bonds issued under the MyRA program shall earn interest at a rate equal to the greater of (determined on the issue date)— (A) the rate earned by the Government Securities Investment Fund established under section 8438(b)(1) of title 5, United States Code