U.S. Treasury Declines to Close SIFL Private Jet Valuation Loophole, Citing Compliance Burden
Why It MattersThe decision preserves current tax treatment of employer-provided aircraft personal use, keeping corporate flight departments' compliance and valuation practices under Treasury Regulation § 1.61-21 unchanged for now.
In a letter dated August 17, 2026, the U.S. Treasury's Office of Legislative Affairs declined to close what critics call the SIFL private jet valuation loophole, responding to a July 24, 2026 letter from Senators Sheldon Whitehouse, Elizabeth Warren, Chris Van Hollen, Ed Markey, and Bernie Sanders. The senators had urged Treasury and the IRS to reform the Standard Industry Fare Level (SIFL) method, which allows executives to value personal travel on corporate aircraft at rates far below actual charter costs, citing a Joint Committee on Taxation analysis showing a New York-to-Washington, D.C. flight with a fair market charter value potentially exceeding $5,000 could be reported under SIFL at approximately $236.
Under Treasury Regulation § 1.61-21, employees must include in gross income the value of personal use of employer-provided aircraft as a fringe benefit, valuing that use either at arm's-length charter cost or under SIFL, which applies published cents-per-mile rates multiplied by an aircraft weight-based factor plus a terminal charge. The Department of Transportation calculates the underlying SIFL mileage rates, and the IRS publishes updated figures twice yearly via Revenue Ruling; for flights taken in the first half of 2026, the terminal charge was $54.48.
Treasury defended the SIFL method on administrative grounds, stating that requiring individualized fair market value appraisals for every personal flight would impose a significant compliance burden on taxpayers and the IRS, and noted the standardized method was finalized in 1989 with semi-annual rate updates intended to reflect prevailing market conditions. The exchange occurs amid the permanent extension of 100 percent bonus depreciation for aircraft purchases under recent tax legislation, which the senators argue amplifies the benefit created by the SIFL valuation gap, with critics including Senator Whitehouse contending that SIFL rates have fallen far behind actual charter costs and shifted tax burden from high-income executives to other taxpayers. Treasury's response indicates the current SIFL valuation framework remains the operative standard for businesses and executives using employer-provided aircraft for personal travel.
