Certain deferrals must be Roth contributions

Except as provided in subparagraph (C), in the case of an eligible participant whose wages (as defined in section 3121(a)) for the preceding calendar year from the employer sponsoring the plan exceed $145,000, paragraph (1) shall apply only if any additional elective deferrals are designated Roth contributions (as defined in section 402A(c)(1)) made pursuant to an employee election.

In the case of an applicable employer plan with respect to which subparagraph (A) applies to any participant for a plan year, paragraph (1) shall not apply to the plan unless the plan provides that any eligible participant may make the participant’s additional elective deferrals as designated Roth contributions.

The Secretary may provide by regulations that an eligible participant may elect to change the participant’s election to make additional elective deferrals if the participant’s compensation is determined to exceed the limitation under subparagraph (A) after the election is made.

In the case of a year beginning after December 31, 2024 , the Secretary shall adjust annually the $145,000 amount in subparagraph (A) for increases in the cost-of-living at the same time and in the same manner as adjustments under 415(d); except that the base period taken into account shall be the calendar quarter beginning July 1, 2023 , and any increase under this subparagraph which is not a multiple of $5,000 shall be rounded to the next lower multiple of $5,000.