A. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2022, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 1, 2023, including those provisions that became effective during 2022 with the specific adoption of all retroactive effective dates, but excluding any changes to the code enacted after January 1, 2023.

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B. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2021 through December 31, 2022, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 1, 2022, including those provisions that became effective during 2021 with the specific adoption of all retroactive effective dates, and including those provisions of the chips and science act of 2022 (P.L. 117-167), inflation reduction act of 2022 (P.L. 117-169) and the consolidated appropriations act, 2023 (P.L. 117-328) that are retroactively effective during taxable years beginning from and after December 31, 2021 through December 31, 2022.

C. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2020 through December 31, 2021, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on March 11, 2021, including those provisions that became effective during 2020 with the specific adoption of all retroactive effective dates and including those provisions of the PPP extension act of 2021 (P.L. 117-6) and the infrastructure investment and jobs act (P.L. 117-58) that are retroactively effective during taxable years beginning from and after December 31, 2020 through December 31, 2021.

D. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2019 through December 31, 2020, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 1, 2020, including those provisions that became effective during 2019 with the specific adoption of all retroactive effective dates, and including those provisions of the families first coronavirus response act (P.L. 116-127), the coronavirus aid, relief, and economic security act (P.L. 116-136), the paycheck protection program flexibility act of 2020 (P.L. 116-142), the consolidated appropriations act, 2021 (P.L. 116-260) and the American rescue plan act of 2021 (P.L. 117-2) that are retroactively effective during taxable years beginning from and after December 31, 2019 through December 31, 2020.

E. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2018 through December 31, 2019, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 1, 2019, including those provisions that became effective during 2018 with the specific adoption of all retroactive effective dates, and including those provisions of the taxpayer first act (P.L. 116-25), the further consolidated appropriations act, 2020 (P.L. 116-94), the coronavirus aid, relief, and economic security act (P.L. 116-136) and the consolidated appropriations act, 2021 (P.L. 116-260) that are retroactively effective during taxable years beginning from and after December 31, 2018 through December 31, 2019.

F. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2017 through December 31, 2018, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 1, 2018, including those provisions that became effective during 2017 with the specific adoption of all retroactive effective dates, and including those provisions of the bipartisan budget act of 2018 (P.L. 115-123), the consolidated appropriations act, 2018 (P.L. 115-141), the further consolidated appropriations act, 2020 (P.L. 116-94), the coronavirus aid, relief, and economic security act (P.L. 116-136) and the consolidated appropriations act, 2021 (P.L. 116-260) that are retroactively effective during taxable years beginning from and after December 31, 2017 through December 31, 2018.

G. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2016 through December 31, 2017, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 1, 2017, including those provisions that became effective during 2016 with the specific adoption of all federal retroactive effective dates, and including those provisions of the disaster tax relief and airport and airway extension act of 2017 (P.L. 115-63), the tax cuts and jobs act (P.L. 115-97), the bipartisan budget act of 2018 (P.L. 115-123), the consolidated appropriations act, 2018 (P.L. 115-141), the further consolidated appropriations act, 2020 (P.L. 116-94) and the coronavirus aid, relief, and economic security act (P.L. 116-136) that are retroactively effective during taxable years beginning from and after December 31, 2016 through December 31, 2017.

H. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2015 through December 31, 2016, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 1, 2016, including those provisions that became effective during 2015 with the specific adoption of all federal retroactive effective dates, and including those provisions of the United States appreciation for olympians and paralympians act of 2016 (P.L. 114-239), the tax cuts and jobs act (P.L. 115-97), the consolidated appropriations act, 2018 (P.L. 115-141), the further consolidated appropriations act, 2020 (P.L. 116-94) and the coronavirus aid, relief, and economic security act (P.L. 116-136) that are retroactively effective during taxable years beginning from and after December 31, 2015 through December 31, 2016.

I. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2014 through December 31, 2015, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 1, 2015, including those provisions that became effective during 2014 with the specific adoption of all federal retroactive effective dates, and including those provisions of the slain officer family support act of 2015 (P.L. 114-7), the don’t tax our fallen public safety heroes act (P.L. 114-14), the surface transportation and veterans health care choice improvement act of 2015 (P.L. 114-41), the consolidated appropriations act, 2016 (P.L. 114-113), the consolidated appropriations act, 2018 (P.L. 115-141) and the coronavirus aid, relief, and economic security act (P.L. 116-136) that are retroactively effective during taxable years beginning from and after December 31, 2014 through December 31, 2015.

J. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2013 through December 31, 2014, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 1, 2014, including those provisions that became effective during 2013 with the specific adoption of all federal retroactive effective dates, and including those provisions of the Philippines charitable giving assistance act (P.L. 113-92), the Gabriella Miller kids first research act (P.L. 113-94), the cooperative and small employer charity pension flexibility act (P.L. 113-97), the highway and transportation funding act of 2014 (P.L. 113-159), the tribal general welfare exclusion act of 2014 (P.L. 113-168), the consolidated and further continuing appropriations act, 2015 (P.L. 113-235), the 2014 airline bankruptcy payments rollover act (P.L. 113-243), the tax increase prevention act of 2014 (P.L. 113-295), the slain officer family support act of 2015 (P.L. 114-7), the consolidated appropriations act, 2016 (P.L. 114-113) and the coronavirus aid, relief, and economic security act (P.L. 116-136) that are retroactively effective during taxable years beginning from and after December 31, 2013 through December 31, 2014.

K. For the purposes of computing income tax pursuant to this title, for taxable years beginning from and after December 31, 2012 through December 31, 2013, "internal revenue code" means the United States internal revenue code of 1986, as amended, in effect on January 3, 2013, including those provisions that became effective during 2012 with the specific adoption of all federal retroactive effective dates, and including those provisions of the Philippines charitable giving assistance act (P.L. 113-92), the highway and transportation funding act of 2014 (P.L. 113-159), the tribal general welfare exclusion act of 2014 (P.L. 113-168), the 2014 airline bankruptcy payments rollover act (P.L. 113-243), the tax technical corrections act of 2014 (P.L. 113-295, division A, title II), the consolidated appropriations act, 2016 (P.L. 114-113) and the coronavirus aid, relief, and economic security act (P.L. 116-136) that are retroactively effective during taxable years beginning from and after December 31, 2012 through December 31, 2013.