Any State may request that an amount allotted to such State for a fiscal year be held available for such State for the following fiscal year. Such request shall include a statement of the reasons that the amount allotted to such State for a fiscal year will not be used by such State during such fiscal year and a description of the types of assistance to be provided with the amount held available for the following fiscal year. Any amount so held available for the following fiscal year shall not be taken into account in computing the allotment of or the amount payable to such State for such fiscal year under this subchapter.

No amount may be held available under this paragraph for a State from a prior fiscal year to the extent such amount exceeds 10 percent of the amount payable to such State for such prior fiscal year. For purposes of the preceding sentence, the amount payable to a State for a fiscal year shall be determined without regard to any amount held available under this paragraph for such State for such fiscal year from the prior fiscal year.