Versions of 26 CFR 1.528-4 - Substantiality test on LawServer 2024 26 CFR 1.528-4 – Substantiality test 2023 26 CFR 1.528-4 – Substantiality test 2022 26 CFR 1.528-4 – Substantiality test 2021 26 CFR 1.528-4 – Substantiality test 2015 26 CFR 1.528-4 – Substantiality test 2014 26 CFR 1.528-4 – Substantiality test 2010 26 CFR 1.528-4 – Substantiality test 2009 26 CFR 1.528-4 – Substantiality test
