628.46—How shall a grantee calculate the amount of endowment fund income that it may withdraw and spend?
A grantee shall calculate the amount of endowment fund income that it may withdraw and spend at a particular time as follows:
(1)
Determine the value of endowment fund income by subtracting the endowment fund corpus from the current total value of the endowment fund on that date; and
(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If the value of endowment fund income in the endowment fund exceeds the aggregate amount of previously withdrawn endowment fund income, the grantee may withdraw and spend up to 50 percent of that excess fund income.