; and (B) such other investigation as the Secretary may find necessary. (2) Payments The Secretary shall then pay to the State, in such installments as the Secretary shall determine, the amount so estimated, reduced or increased to the extent of any overpayment or underpayment which the Secretary determines was made under this section to such State for any prior quarter and with respect to which adjustment has not already been made under this subsection. (e) Limitation Beginning with the fifth fiscal year quarter for which a State plan is approved under this title, and for each quarter thereafter, a State shall not receive a payment under this section for amounts expended by the State during the quarter for the proper and efficient administration of the program funded under this title that exceed the amount equal to 15 percent of the amount expended by the State during the quarter to provide eligible individuals with employment services, training and other services and activities, and supportive services. (f) Planning and implementation grants