58ASubsequently ascertaining components of a parent’s adjusted taxable income

58A Subsequently ascertaining components of a parent’s adjusted taxable income

(1) The Registrar must immediately amend an administrative assessment of child support payable by or to a parent in relation to a child support period if: (a) the assessment was made on the basis of a determination under section 58; and (b) either: (i) the Registrar subsequently ascertains the amount of the parent’s adjusted taxable income for the last relevant year of income; or (ii) the Registrar makes a later determination under section 58; and (c) either: (i) if subparagraph (b)(i) applies—the amount that was subsequently ascertained is different from the amount that was determined under section 58; or (ii) if subparagraph (b)(ii) applies—the later amount that the Registrar determines is different from the earlier amount determined under section 58. Retrospective determinations (2) If: (a) at the time the Registrar is to amend the administrative assessment under this section, the parent could lodge his or her tax return by the date required under Part IV of the Income Tax Assessment Act 1936 (taking into account any deferral under section 388‑55 in Schedule 1 to the Taxation Administration Act 1953); or (b) paragraph (a) of this subsection does not apply and: (i) the amount subsequently ascertained, as mentioned in subparagraph (1)(b)(i), is higher than the amount that was determined under section 58; or (ii) the later amount that the Registrar determines, as mentioned in subparagraph (1)(b)(ii), is higher than the earlier amount determined under section 58; then the Registrar must immediately amend the administrative assessment for the child support period on the basis that the parent’s adjusted taxable income for that year of income is, and has always been, the amount that was subsequently ascertained or later determined (as the case requires). Prospective determinations (3) If subsection (2) does not apply, then the Registrar must immediately amend the administrative assessment for the child support period on the basis that for each later day in the period the parent’s adjusted taxable income for that year of income is the amount that was subsequently ascertained or later determined (as the case requires). No taxation assessment required (4) This section applies whether or not the Commissioner of Taxation has made an assessment under an Income Tax Assessment Act of the parent’s taxable income for that year of income.