§ 1378. Taxable year of S corporation
(a)
General rule
For purposes of this subtitle, the taxable year of an S corporation shall be a permitted year.
(b)
Permitted year defined
For purposes of this section, the term “permitted year” means a taxable year which—
(2)
is any other accounting period for which the corporation establishes a business purpose to the satisfaction of the Secretary.
For purposes of paragraph (2), any deferral of income to shareholders shall not be treated as a business purpose.