26 CFR §1.1411-6

1. (a)General rule. For purposes of section 1411, any item of gross income from the investment of working capital will be treated as not derived in the ordinary course of a trade or business, and any net gain that is attributable to the investment of working capital will be treated as not derived in the ordinary course of a trade or business. In determining whether any item is gross income from or net gain attributable to an investment of working capital, principles similar to those described in § 1.469-2T(c)(3)(ii) apply. See § 1.1411-4(f) for rules regarding properly allocable deductions with respect to an investment of working capital and § 1.1411-7 for rules relating to the adjustment to net gain on the disposition of interests in a partnership or S corporation.
2. (b)Example. The following example illustrates the principles of this section. Assume for purposes of the example that the taxpayer uses a calendar taxable year, the taxpayer is a United States citizen, and Year 1 and all subsequent years are taxable years in which section 1411 is in effect:
3. (c)Effective/applicability date. This section applies to taxable years beginning after December 31, 2013. However, taxpayers may apply this section to taxable years beginning after December 31, 2012, in accordance with § 1.1411-1(f).