(A) determined without regard to sections 911, 931, and 933, and (B) determined without regard to any exclusion or deduction allowed for any qualified retirement savings contribution made during the taxable year. (2) Treatment of contributions In the case of any contribution under subsection (a)(2)— (A) except as otherwise provided in this section or by the Secretary under regulations, such contribution shall be treated in the same manner as a contribution made by the individual on whose behalf such contribution was made, (B) such contribution shall not be treated as income to the taxpayer, and (C) such contribution shall not be taken into account with respect to any applicable limitation under sections 402(g)(1), 403(b), 408(a)(1), 408(b)(2)(B), 408A(c)(2), 414(v)(2), 415(c), or 457(b)(2). (3) Treatment of qualified plans, etc A plan or arrangement to which a contribution is made under this section shall not be treated as violating any requirement under section 401, 403, 408, or 457 solely by reason of accepting such contribution. (4) Erroneous credits If any contribution is erroneously paid under subsection (a)(2), the amount of such erroneous payment shall be treated as an underpayment of tax. (g) Inflation adjustments (1) In general In the case of any taxable year beginning in a calendar year after 2020, each of the dollar amounts in subsections (a)(2) and (b)(3)(A)(i) shall be increased by an amount equal to— (A) such dollar amount, multiplied by (B) the cost-of-living adjustment determined under section 1(f)(3) for the calendar year in which the taxable year begins, determined by substituting calendar year 2019 for calendar year 2016 in subparagraph (A)(ii) thereof. (2) Rounding Any increase determined under paragraph (1) shall be rounded to the nearest multiple of— (A) $100 in the case of an adjustment of the amount in subsection (a)(2), and (B) $1,000 in the case of an adjustment of the amount in subsection (b)(3)(A)(i). . (b) Payment authority Section 1324(b)(2) of title 31, United States Code, is