In general

Notwithstanding subsections (e)(3) and (h)(1)(B), the elective deferrals of any individual for any taxable year shall be included in such individual’s gross income to the extent the amount of such deferrals for the taxable year exceeds the applicable dollar amount. The preceding sentence shall not apply to the portion of such excess as does not exceed the designated Roth contributions of the individual for the taxable year.