42 U.S. Code § 15023 - Payments to the States for planning, administration, and services
(a) State plan expenditures
From each State’s allotments for a fiscal year under section 15022 of this title, the Secretary shall pay to the State the Federal share of the cost, other than the cost for construction, incurred during such year for activities carried out under the State plan approved under section 15024 of this title. The Secretary shall make such payments from time to time in advance on the basis of estimates by the Secretary of the sums the State will expend for the cost under the State plan. The Secretary shall make such adjustments as may be necessary to the payments on account of previously made underpayments or overpayments under this section.