(a) The State's annual grant application for a fiscal year and the State's authority to incur costs under that application shall expire on the last day of the fiscal year.

(b) Except as provided in paragraph (c) of this section, each State shall submit a final voucher which satisfies the requirements of § 1300.33(b) within 120 days after the expiration of the annual grant application. The final voucher constitutes the final financial reconciliation for each fiscal year.

(c) The Regional Administrator may extend the time period by no more than 30 days to submit a final voucher only in extraordinary circumstances, consistent with 2 CFR 200.344 and 200.345. States shall submit a written request for an extension describing the extraordinary circumstances that necessitate an extension. The approval of any such request for extension shall be in writing, shall specify the new deadline for submitting the final voucher, and shall be signed by the Regional Administrator.

(a) Carry-forward balances. Except as provided in paragraph (b) of this section, grant funds that remain unexpended at the end of a fiscal year and the expiration of an annual grant application shall be credited to the State's highway safety account for the new fiscal year and made immediately available for use by the State, provided the State's new annual grant application has been approved by the Regional Administrator pursuant to § 1300.12(c), including any amendments to the annual grant application pursuant to § 1300.32.

(b) Deobligation of funds. (1) Except as provided in paragraph (b)(2) of this section, unexpended grant funds shall not be available for expenditure beyond the period of three years after the last day of the fiscal year of apportionment or allocation.

(2) NHTSA shall notify States of any such unexpended grant funds no later than 180 days prior to the end of the period of availability specified in paragraph (b)(1) of this section and inform States of the deadline for commitment. States may commit such unexpended grant funds to a specific project by the specified deadline, and shall provide documentary evidence of that commitment, including a copy of an executed project agreement, to the Regional Administrator.

(3) Grant funds committed to a specific project in accordance with paragraph (b)(2) of this section shall remain committed to that project and must be expended by the end of the succeeding fiscal year. The final voucher for that project shall be submitted within 120 days after the end of that fiscal year.

(4) NHTSA shall deobligate unexpended balances at the end of the time period in paragraph (b)(1) or (3) of this section, whichever is applicable, and the funds shall lapse.

The expiration of an annual grant application does not affect the ability of NHTSA to disallow costs and recover funds on the basis of a later audit or other review or the State's obligation to return any funds due as a result of later refunds, corrections, or other transactions.

Notwithstanding the expiration of an annual grant application, the provisions in 2 CFR parts 200 and 1201 and 23 CFR part 1300, including but not limited to equipment and audit, continue to apply to the grant funds authorized under 23 U.S.C. Chapter 4 and Section 1906.