Versions of Iowa Code 514B.31 - Taxation on LawServer 2024 Iowa Code 514B.31 – Taxation 2023 Iowa Code 514B.31 – Taxation 2022 Iowa Code 514B.31 – Taxation 2020 Iowa Code 514B.31 – Taxation 2018 Iowa Code 514B.31 – Taxation 2016 Iowa Code 514B.31 – Taxation 2014 Iowa Code 514B.31 – Taxation. 2009 Iowa Code 514B.31 – Taxation