Fringe benefits aircraft valuation formula. The Standard Industry Fare Level (SIFL) cents-per-mile rates and terminal charges in effect for the second half of 2005 are set forth for purposes of determining the value of noncommercial flights on employer-provided aircraft under section 1.61-21(g) of the regulations.

Interest rates; underpayments and overpayments. The rate of interest determined under section 6621 of the Code for the calendar quarter beginning October 1, 2005, will be 7 percent for overpayments (6 percent in the case of a corporation), 7 percent for underpayments, and 9 percent for large corporate underpayments. The rate of interest paid on the portion of a corporate overpayment exceeding $10,000 will be 4.5 percent.

Specifications are set forth for the private printing of paper and laser-printed substitutes for tax year 2005 Form W-2, Wage and Tax Statement, and Form W-3, Transmittal of Wage and Tax Statements. Rev. Proc. 2004-54 superseded.