2 U.S. Code § 364. Provision relating to certain other pay adjustments
A provision of law increasing the rate of pay payable for an office or position within the purview of subparagraph (A), (B), (C), or (D) of section 356 of this title shall not take effect before the beginning of the Congress following the Congress during which such provision is enacted.
For purposes of this section, a provision of law enacted during the period beginning on the Tuesday following the first Monday of November of an even-numbered year of any Congress and ending at noon on the following January 3 shall be considered to have been enacted during the first session of the following Congress.
(3) Nothing in this section shall be considered to apply with respect to any pay increase—
which is based on a change in the Employment Cost Index (as determined under section 704(a)(1) of the Ethics Reform Act of 1989) or which is in lieu of any pay adjustment which might otherwise be made in a year based on a change in such index (as so determined); or
which takes effect under section 702 or 703 of the Ethics Reform Act of 1989.