34 C.F.R. § 628.46
A grantee shall calculate the amount of endowment fund income that it may withdraw and spend at a particular time as follows:
(a) On each date that the grantee plans a withdrawal of income, it must—
(b) If the value of endowment fund income in the endowment fund exceeds the aggregate amount of previously withdrawn endowment fund income, the grantee may withdraw and spend up to 50 percent of that excess fund income.
(Authority: 20 U.S.C. 1065)
[49 FR 28521, July 21, 1984, as amended at 52 FR 11258, Apr. 8, 1987]