Spending and borrowing authority for a fiscal year to enter into Federal credit instruments shall be promptly apportioned to the Secretary on a fiscal-year basis.

(1) Spending and borrowing authority.— Spending and borrowing authority for a fiscal year to enter into Federal credit instruments shall be promptly apportioned to the Secretary on a fiscal-year basis.

(2) Reestimates.— If the subsidy cost of a Federal credit instrument is reestimated, the cost increase or decrease of the reestimate shall be borne by, or benefit, the general fund of the Treasury, consistent with section 504(f) of the Congressional Budget Act of 1974 (2 U.S.C. 661c(f)).

Of the total amount of funds made available to carry out the TIFIA program for each fiscal year, not more than 10 percent shall be set aside for rural infrastructure projects or rural projects funds.

(A) In general.— Of the total amount of funds made available to carry out the TIFIA program for each fiscal year, not more than 10 percent shall be set aside for rural infrastructure projects or rural projects funds.

(B) Reobligation.— Any amounts set aside under subparagraph (A) that remain unobligated by June 1 of the fiscal year for which the amounts were set aside shall be available for obligation by the Secretary on projects other than rural infrastructure projects or rural projects funds.

(4) Availability.— Amounts made available to carry out the TIFIA program shall remain available until expended.

(5) Administrative costs.— Of the amounts made available to carry out the TIFIA program, the Secretary may use not more than $6,875,000 for fiscal year 2016, $7,081,000 for fiscal year 2017, $7,559,000 for fiscal year 2018, $8,195,000 for fiscal year 2019, and $8,441,000 for fiscal year 2020 for the administration of the TIFIA program.

Notwithstanding any other provision of law, execution of a term sheet by the Secretary of a Federal credit instrument that uses amounts made available under the TIFIA program shall impose on the United States a contractual obligation to fund the Federal credit investment.

(1) In general.— Notwithstanding any other provision of law, execution of a term sheet by the Secretary of a Federal credit instrument that uses amounts made available under the TIFIA program shall impose on the United States a contractual obligation to fund the Federal credit investment.

(2) Availability.— Amounts made available to carry out the TIFIA program for a fiscal year shall be available for obligation on October 1 of the fiscal year.

(Added and amended Pub. L. 105–178, title I, § 1503(a), (c), June 9, 1998, 112 Stat. 249, § 188; Pub. L. 105–206, title IX, § 9007(a), July 22, 1998, 112 Stat. 849; Pub. L. 108–88, § 5(a)(10), Sept. 30, 2003, 117 Stat. 1115; Pub. L. 108–202, § 5(a)(10), Feb. 29, 2004, 118 Stat. 481; Pub. L. 108–224, § 4(a)(10), Apr. 30, 2004, 118 Stat. 629; Pub. L. 108–263, § 4(a)(10), June 30, 2004, 118 Stat. 700; Pub. L. 108–280, § 4(a)(10), July 30, 2004, 118 Stat. 879; Pub. L. 108–310, § 5(a)(10), Sept. 30, 2004, 118 Stat. 1149; Pub. L. 109–14, § 4(a)(10), May 31, 2005, 119 Stat. 327; Pub. L. 109–20, § 4(a)(10), July 1, 2005, 119 Stat. 348; Pub. L. 109–35, § 4(a)(10), July 20, 2005, 119 Stat. 381; Pub. L. 109–37, § 4(a)(10), July 22, 2005, 119 Stat. 396; Pub. L. 109–40, § 4(a)(10), July 28, 2005, 119 Stat. 413; renumbered § 608 and amended Pub. L. 109–59, title I, §§ 1601(g), 1602(b)(5), (d), Aug. 10, 2005, 119 Stat. 1242, 1247; Pub. L. 112–141, div. A, title II, § 2002, July 6, 2012, 126 Stat. 620; Pub. L. 114–94, div. A, title II, § 2001(g), Dec. 4, 2015, 129 Stat. 1444.)