The notice announces the inflation adjustment factor and phase-out amount for the enhanced oil recovery credit for taxable years beginning in the 2023 calendar year.

# Notice 2023-57 TABLE 1 GNP IMPLICIT PRICE DEFLATORS

Section 43(a) of the Internal Revenue Code provides that for purposes of section 38, the enhanced oil recovery credit for any taxable year is an amount equal to 15 percent of the taxpayer’s qualified enhanced oil recovery costs for such taxable year.

Section 43(b)(1) provides that the amount of the credit determined under subsection (a) for any taxable year shall be reduced by an amount which bears the same ratio to the amount of such credit (determined without regard to this paragraph) as — (A) the amount by which the reference price for the calendar year preceding the calendar year in which the taxable years begins exceeds $28, bears to (B) $6.

Section 43(b)(3)(B) requires the Secretary to publish an inflation adjustment factor. The enhanced oil recovery credit under § 43 for any taxable year is reduced if the “reference price,” determined under § 45K(d)(2)(C), for the calendar year preceding the calendar year in which the taxable year begins is greater than $28 multiplied by the inflation adjustment factor the current calendar year.

The term “inflation adjustment factor” means, with respect to any calendar year, a fraction the numerator of which is the GNP implicit price deflator for the preceding calendar year and the denominator of which is the GNP implicit price deflator for 1990.

Because the reference price for the 2022 calendar year ($93.97) exceeds $28 multiplied by the inflation adjustment factor for the 2023 calendar year ($28 multiplied by 1.9998 = $55.99) by $37.98, the enhanced oil recovery credit for qualified costs paid or incurred in 2023 is phased out completely.

Table 1 contains the GNP implicit price deflator used for the 2022 calendar year, as well as the previously published GNP implicit price deflators used for the 1991 through 2021 calendar years.

# * Beginning in 1995, the GNP implicit price deflator was rebased relative to 1992.

* Beginning in 1995, the GNP implicit price deflator was rebased relative to 1992. The 1990 GNP implicit price deflator used to compute the 1996 § 43 inflation adjustment factor is 93.6.

** Beginning in 1997, two digits follow the decimal point in the GNP implicit price deflator. The 1990 GNP price deflator used to compute the 1998 § 43 inflation adjustment factor is 93.63.

*** Beginning in 1999, the GNP implicit price deflator was rebased relative to 1996. The 1990 GNP implicit price deflator used to compute the 2000 § 43 inflation adjustment factor is 86.53.

**** Beginning in 2003, the GNP implicit price deflator was rebased, and the 1990 GNP implicit price deflator used to compute the 2004 § 43 inflation adjustment factor is 81.589.

***** Beginning in 2009, the GNP implicit price deflator was rebased, and the 1990 GNP implicit price deflator used to compute the 2010 § 43 inflation adjustment factor is 72.199.

****** Beginning in 2011, the 1990 GNP implicit price deflator used to compute the 2012 § 43 inflation adjustment factor is 72.260.

******* Beginning in 2013, the GNP implicit price deflator was rebased, and the 1990 GNP implicit price deflator used to compute the 2014 § 43 inflation adjustment factor is 66.803.

******** Beginning in 2014, the 1990 GNP implicit price deflator used to compute the 2015 § 43 inflation adjustment factor is 66.732.

********* Beginning in 2018, the 1990 GNP implicit price deflator used to compute the 2019 § 43 inflation adjustment factor is 63.637.

********** Beginning in 2021, the 1990 GNP implicit price deflator used to compute the 2022 § 43 inflation adjustment factor is 63.604.

Table 2 contains the inflation adjustment factor and the phase-out amount for taxable years beginning in the 2023 calendar year as well as the previously published inflation adjustment factors and phase-out amounts for taxable years beginning in the 1991 through 2022 calendar years.