Applicability date -
(1) General rule. Except as provided in paragraph (d)(2) of this section, the provisions of this section apply to taxable years ending after February 8, 2019.
(2) Exceptions -
(i) Anti-abuse rules. The provisions of paragraph (c)(1)(iv) of this section apply to taxable years ending after December 22, 2017.
(ii) Non-calendar year RPE. For purposes of determining QBI, W-2 wages, UBIA of qualified property, and the aggregate amount of qualified REIT dividends and qualified PTP income if an individual receives any of these items from an RPE with a taxable year that begins before January 1, 2018, and ends after December 31, 2017, such items are treated as having been incurred by the individual during the individual's taxable year in which or with which such RPE taxable year ends.