26 U.S.C. § 442 — Change of annual accounting period

This section requires government approval before a taxpayer's new accounting period becomes official. If a taxpayer changes their annual accounting period, that new period only becomes their "taxable year" for tax purposes if the Secretary approves the change. There's a special rule for DISCs (a type of export-related corporation). Normally, under section 441(g), a DISC's taxable year is tied to a shareholder's year. If instead a DISC adopts its own annual accounting period (as defined in section 441(c)) that isn't a calendar year, this section treats that as if the DISC had "changed" its accounting period — meaning it needs the Secretary's approval too, just like any other taxpayer changing its tax year.