SECTION 7. EFFECTIVE DATE

A taxpayer must apply this revenue procedure to a taxable year beginning on or before May 17, 2006, if the taxpayer applies §§ 1.199–1 through 1.199–9 to the taxable year. For a taxpayer who chooses not to rely on §§ 1.199–1 through 1.199–9 and this revenue procedure for a taxable year beginning on or before May 17, 2006, the guidance on W–2 wages under § 199 that applies to such taxable year is contained in Notice 2005–14 or § 1.199–2 of the proposed regulations. If Notice 2005–14 and § 1.199–2 of the proposed regulations include different rules for the same particular issue, then a taxpayer may rely on either the rule set forth in Notice 2005–14 or the rule set forth in § 1.199–2 of the proposed regulations. However, if § 1.199–2 of the proposed regulations includes a rule that was not included in Notice 2005–14, then a taxpayer is not permitted to rely on the absence of a rule to apply a rule contrary to § 1.199–2 of the proposed regulations. For taxable years beginning after May 17, 2006, and before June 1, 2006, a taxpayer may not apply Notice 2005–14, the proposed regulations, or any other guidance under § 199 in a manner inconsistent with amendments made to § 199 by section 514 of TIPRA.