Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Fare Formulas 1979 to Present (SIFL)

Document
SIFL_2024q1q2_Final_Appendix_B.pdf

About this Document

The Department of Transportation has continued to calculate the Standard Industry Fare Level (SIFL) adjustment factor to aid in its evaluation of carrier pricing in the free market.  The SIFL is also used by the Internal Revenue Service in imputing the value of free transportation provided on corporate aircraft.

This document provides the SIFL formula used from May 15, 1979 to present.

Last updated: Wednesday, August 7, 2024