Notice 2023-57 TABLE 2

INFLATION ADJUSTMENT FACTORS AND

PHASE-OUT AMOUNTS Calendar Year Inflation Adjustment Factor Phase-out Amount 1991 1.0000 0 1992 1.0363 0 1993 1.0708 0 1994 1.0992 0 1995 1.1160 0 1996 1.1485 0 1997 1.1720 0 1998 1.1999 0 1999 1.2030 0 2000 1.2087 0 2001 1.2353 0 2002 1.2633 0 2003 1.2785 0 2004 1.2952 0 2005 1.3266 0 2006 1.3743 100 percent 2007 1.4222 100 percent 2008 1.4666 100 percent 2009 1.5003 100 percent 2010 1.5203 100 percent 2011 1.5326 100 percent 2012 1.5686 100 percent 2013 1.5968 100 percent 2014 1.5974 100 percent 2015 1.6245 100 percent 2016 1.6464 0 2017 1.6713 0 2018 1.7008 1.069 percent 2019 1.7334 100 percent 2020 1.7640 100 percent 2021 1.7849 0 2022 1.8607 100 percent 2023 1.9998 100 percent

DRAFTING INFORMATION

The principal author of this notice is John M. Deininger of the Office of

Associate Chief Counsel (Passthroughs and Special Industries). For further information regarding this notice, contact Mr.

Deininger at (202) 317-6853 (not a tollfree number).

August 21, 2023 562 Bulletin No. 2023–34

Reference Price for Section 45I Credit for Production of Natural Gas from Marginal Wells During Taxable Years Beginning in Calendar Year 2023