shall be available on October 1, 2018 (in addition to the $4,000,000,000 previously appropriated under this heading that shall be available on October 1, 2018), and $4,000,000,000, to remain available until expended, shall be available on October 1, 2019: Provided , That the amounts made available under this heading are provided as follows: (1) $20,106,613,000 shall be available for renewals of expiring section 8 tenant-based annual contributions contracts (including renewals of enhanced vouchers under any provision of law authorizing such assistance under section 8(t) of the Act) and including renewal of other special purpose incremental vouchers: Provided , That notwithstanding any other provision of law, from amounts provided under this paragraph and any carryover, the Secretary for the calendar year 2019 funding cycle shall provide renewal funding for each public housing agency based on validated voucher management system (VMS) leasing and cost data for the prior calendar year and by applying an inflation factor as established by the Secretary, by notice published in the Federal Register, and by making any necessary adjustments for the costs associated with the first-time renewal of vouchers under this paragraph including tenant protection and Choice Neighborhoods vouchers: Provided further , That none of the funds provided under this paragraph may be used to fund a total number of unit months under lease which exceeds a public housing agency's authorized level of units under contract, except for public housing agencies participating in the MTW demonstration, which are instead governed by the terms and conditions of their MTW agreements: Provided further , That the Secretary shall, to the extent necessary to stay within the amount specified under this paragraph (except as otherwise modified under this paragraph), prorate each public housing agency's allocation otherwise established pursuant to this paragraph: Provided further , That except as provided in the following provisos, the entire amount specified