; and (4) by adding at the end the following new clause: (vii) in the case of a CSEC plan (as defined in section 210(f)(1)), for plan years beginning after December 31, 2017, for each individual who is a participant in such plan during the plan year an amount equal to the sum of— (I) the additional premium (if any) determined under subparagraph (E), and (II) $19. . (b) Variable rate premium (1) Unfunded vested benefits (A) In general Subparagraph (E) of section 4006(a)(3) of the Employee Retirement Income Security Act of 1974 ( 29 U.S.C. 1306(a)(3) ) is amended by adding at the end the following new clause: (v) For purposes of clause (ii), in the case of a CSEC plan (as defined in section 210(f)(1)), the term unfunded vested benefits means, for plan years beginning after December 31, 2017, the excess (if any) of— (I) the funding liability of the plan as determined under section 306(j)(5)(C) for the plan year by only taking into account vested benefits, over (II) the fair market value of plan assets for the plan year which are held by the plan on the valuation date. . (B) Conforming amendment Clause (iii) of section 4006(a)(3)(E) of such Act ( 29 U.S.C. 1306(a)(3)(E) ) is amended by striking For purposes and inserting Except as provided in clause (v), for purposes . (2) Applicable dollar amount (A) In general Paragraph (8) of section 4006(a) of such Act ( 29 U.S.C. 1306(a) ) is amended by adding at the end the following new subparagraph: (E) CSEC plans In the case of a CSEC plan (as defined in section 210(f)(1)), the applicable dollar amount shall be $9. . (B) Conforming amendment Subparagraph (A) of section 4006(a)(8) of such Act ( 29 U.S.C. 1306(a)(8) ) is amended by striking (B) and (C) and inserting (B), (C), and (E) . III Benefits relating to United States Tax Court 301. Thrift Savings Plan contributions for judges in the Federal Employees Retirement System (a) In general Subsection (j)(3)(B) of section 7447 of the Internal Revenue Code of 1986 is amended to read as follows: (B) Contributions for benefit of