taxable years beginning after, December 31, 2017. 215. Refundable tax credit for health insurance coverage (a) In general Subpart C of part IV of subchapter A of chapter 1 of the Internal Revenue Code of 1986 is amended by inserting after section 36B the following new section: 36C. Health insurance coverage (a) In general In the case of an individual, there shall be allowed as a credit against the tax imposed by this subtitle for the taxable year the sum of the monthly credit amounts with respect to such taxpayer for calendar months during such taxable year. (b) Monthly credit amounts (1) In general The monthly credit amount with respect to any taxpayer for any calendar month is the lesser of— (A) the sum of the monthly limitation amounts determined under subsection (c) with respect to the taxpayer and the taxpayer’s qualifying family members for such month, or (B) the amount paid for eligible health insurance for the taxpayer and the taxpayer’s qualifying family members for such month. (2) Eligible coverage month requirement No amount shall be taken into account under subparagraph (A) or (B) of paragraph (1) with respect to any individual for any month unless such month is an eligible coverage month with respect to such individual. (c) Monthly limitation amounts (1) In general The monthly limitation amount with respect to any individual for any eligible coverage month during any taxable year is 1/12 of— (A) $2,000 in the case of an individual who has not attained age 30 as of the beginning of such taxable year, (B) $2,500 in the case of an individual who has attained age 30 but who has not attained age 40 as of such time, (C) $3,000 in the case of an individual who has attained age 40 but who has not attained age 50 as of such time, (D) $3,500 in the case of an individual who has attained age 50 but who has not attained age 60 as of such time, and (E) $4,000 in the case of an individual who has attained age 60 as of such time. (2) Limitation based on modified adjusted gross income (A) In general The amount