(1)
In general
For purposes of this part, the direct cost of the Federal mandates in a bill, joint resolution, amendment, motion, or conference report that reauthorizes appropriations, or that amends existing authorizations of appropriations, to carry out a statute, or that otherwise amends any statute, means the net increase, resulting from enactment of the bill, joint resolution, amendment, motion, or conference report, in the amount described under paragraph (2)(A) over the amount described under paragraph (2)(B).
(3)
Extension of authorization of appropriations
For purposes of this section, in the case of legislation to extend authorization of appropriations, the authorization level that would be provided by the extension shall be compared to the authorization level for the last year in which authorization of appropriations is already provided.