2 U.S. Code § 642
2 U.S. Code § 642 is about Budget-related legislation must be within appropriate levels. It is under Subchapter I (Congressional Budget Process) of Chapter 17A (Congressional Budget and Fiscal Operations) of Title 2 (The Congress) of the Code.
(a) Enforcement of budget aggregates
(1) In House of Representatives
Except as provided by subsection (c), after the Congress has completed action on a concurrent resolution on the budget for a fiscal year, it shall not be in order in the House of Representatives to consider any bill, joint resolution, amendment, motion, or conference report providing new budget authority or reducing revenues, if—
(A) the enactment of that bill or resolution as reported;
(B) the adoption and enactment of that amendment; or
(C) the enactment of that bill or resolution in the form recommended in that conference report;
would cause the level of total new budget authority or total outlays set forth in the applicable concurrent resolution on the budget for the first fiscal year to be exceeded, or would cause revenues to be less than the level of total revenues set forth in that concurrent resolution for the first fiscal year or for the total of that first fiscal year and the ensuing fiscal years for which allocations are provided under section 633(a) of this title, except when a declaration of war by the Congress is in effect.
(2) In Senate
After a concurrent resolution on the budget is agreed to, it shall not be in order in the Senate to consider any bill, joint resolution, amendment, motion, or conference report that—
(A) would cause the level of total new budget authority or total outlays set forth for the first fiscal year in the applicable resolution to be exceeded; or
(B) would cause revenues to be less than the level of total revenues set forth for that first fiscal year or for the total of that first fiscal year and the ensuing fiscal years in the applicable resolution for which allocations are provided under section 633(a) of this title.
(3) Enforcement of social security levels in Senate
After a concurrent resolution on the budget is agreed to, it shall not be in order in the Senate to consider any bill, joint resolution, amendment, motion, or conference report that would cause a decrease in social security surpluses or an increase in social security deficits relative to the levels set forth in the applicable resolution for the first fiscal year or for the total of that fiscal year and the ensuing fiscal years for which allocations are provided under section 633(a) of this title.
(b) Social security levels
(1) In general
For purposes of subsection (a)(3), social security surpluses equal the excess of social security revenues over social security outlays in a fiscal year or years with such an excess and social security deficits equal the excess of social security outlays over social security revenues in a fiscal year or years with such an excess.
(2) Tax treatment
For purposes of subsection (a)(3), no provision of any legislation involving a change in chapter 1 of the Internal Revenue Code of 1986 [26 U.S.C. 1 et seq.] shall be treated as affecting the amount of social security revenues or outlays unless that provision changes the income tax treatment of social security benefits.
(c) Exception in House of Representatives
Subsection (a)(1) shall not apply in the House of Representatives to any bill, joint resolution, or amendment that provides new budget authority for a fiscal year or to any conference report on any such bill or resolution, if—
(1) the enactment of that bill or resolution as reported;
(2) the adoption and enactment of that amendment; or
(3) the enactment of that bill or resolution in the form recommended in that conference report;
would not cause the appropriate allocation of new budget authority made pursuant to section 633(a) of this title for that fiscal year to be exceeded.
