Versions of 26 CFR 1.338-10 - Filing of returns on LawServer 2024 26 CFR 1.338-10 – Filing of returns 2023 26 CFR 1.338-10 – Filing of returns 2022 26 CFR 1.338-10 – Filing of returns 2021 26 CFR 1.338-10 – Filing of returns 2015 26 CFR 1.338-10 – Filing of returns 2014 26 CFR 1.338-10 – Filing of returns 2010 26 CFR 1.338-10 – Filing of returns 2009 26 CFR 1.338-10 – Filing of returns.