Versions of Iowa Code 422.16 - Withholding of income tax at source -- penalties -- interest -- declaration of estimated tax -- bond on LawServer 2023 Iowa Code 422.16 – Withholding of income tax at source — penalties — interest — declaration of estimated tax — bond 2022 Iowa Code 422.16 – Withholding of income tax at source — penalties — interest — declaration of estimated tax — bond. 2020 Iowa Code 422.16 – Withholding of income tax at source — penalties — interest — declaration of estimated tax — bond. 2018 Iowa Code 422.16 – Withholding of income tax at source — penalties — interest — declaration of estimated tax — bond. 2016 Iowa Code 422.16 – Withholding of income tax at source 2014 Iowa Code 422.16 – Withholding of income tax at source – penalties – interest – declaration of estimated tax – bond. 2009 Iowa Code 422.16 – Withholding of income tax at source — penalties — interest — declaration of estimated tax — bond