Versions of Iowa Code 425.16 - Additional tax credit on LawServer 2023 Iowa Code 425.16 – Additional tax credit 2022 Iowa Code 425.16 – Additional tax credit 2020 Iowa Code 425.16 – Additional tax credit 2018 Iowa Code 425.16 – Additional tax credit 2016 Iowa Code 425.16 – Additional tax credit 2014 Iowa Code 425.16 – Additional tax credit. 2009 Iowa Code 425.16 – Additional tax credit