Versions of Iowa Code 28E.22 - Referendum for tax on LawServer 2023 Iowa Code 28E.22 – Referendum for tax 2022 Iowa Code 28E.22 – Referendum for tax 2020 Iowa Code 28E.22 – Referendum for tax 2018 Iowa Code 28E.22 – Referendum for tax 2016 Iowa Code 28E.22 – Referendum for tax 2014 Iowa Code 28E.22 – Referendum for tax. 2009 Iowa Code 28E.22 – Referendum for tax