Investing in America’s Future Act of 2018 , , and (B) by adding at the end the following new subsection: (h) Excess contributions to privately managed USAccounts For purposes of this section, in the case of a USAccount subject to management under section 4(g) of the USAccounts: Investing in America’s Future Act of 2018 , the term excess contributions means the sum of— (1) the aggregate amount contributed for the taxable year to the account, and (2) the amount determined under this subsection for the preceding taxable year, reduced by the sum of— (A) the distributions out of the account, and (B) the excess (if any) of— (i) the maximum amount allowable as a contribution under section 4(c)(3)(C) of the USAccounts: Investing in America’s Future Act of 2018 for the taxable year, over (ii) the amount contributed to the account for the taxable year. . (2) Prohibited transactions Section 4975 of the Internal Revenue Code of 1986 is amended— (A) by adding at the end of subsection (c) the following new paragraph: (7) Special rule for USAccounts An individual for whose benefit a USAccount subject to management under section 4(g) of the USAccounts: Investing in America’s Future Act of 2018 shall be exempt from the tax imposed by this section with respect to any transaction concerning such account (which would otherwise be taxable under this section) if, with respect to such transaction, the account ceases to be a USAccount by reason of the application of section 530A(c)(2) to such account. , and (B) in subsection (e)(1) by redesignating subparagraph (G) as subparagraph (H) and by inserting after subparagraph (F) the following new subparagraph: (G) a USAccount subject to management under section 4(g) of the USAccounts: Investing in America’s Future Act of 2018 , . (c) Increase in child tax credit (1) In general Section 24 of the Internal Revenue Code of 1986 is amended by adding at the end the following: (i) USAccount contributions For purposes of this section— (1) In general The amount allowed as a credit under subsection