§ 1551. Definitions; applicability of subchapter
(a)
In this subchapter—
(1)
An obligated balance of an appropriation account as of the end of a fiscal year is the amount of unliquidated obligations applicable to the appropriation less amounts collectible as repayments to the appropriation.
(b)
The limitations on the availability for expenditure prescribed in this subchapter apply to all appropriations unless specifically otherwise authorized by a law that specifically—
(1)
identifies the appropriate account for which the availability for expenditure is to be extended;