34 C.F.R. § 367.52
(b) The amounts referred to in paragraph (a) of this section are any amounts that are not paid to States under section 752(c)(2) of the Act and § 367.51 as a result of—
(e) A State that does not intend to expend the full amount of its allotment must notify RSA at least 45 days prior to the end of the fiscal year that its grant, or a portion of it, is available for reallotment.
(Approved by the Office of Management and Budget under control number 1820-0660)
(Authority: Section 752(i)(4) of the Rehabilitation Act of 1973, as amended; 29 U.S.C. 796k(i)(4))