; and (2) if the obligation remains unliquidated at the time of modification of the Federal share under this section. (e) Continuation of increased Federal share (1) In general Except as described in paragraph (2), if an increased Federal share is applied under this section to an obligation described in subsection (c), the increased Federal share shall continue to apply after September 30, 2021. (2) Deobligation If an increased Federal share is applied under this section to an obligation described in subsection (c) and the funds are deobligated on or after October 1, 2021, this section shall not apply to any reobligation of the funds. (f) Exception Subsection (b) shall not apply to amounts initially authorized under section 115 of title 23, United States Code, in or after fiscal year 2021.