2024 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2023 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2022 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2021 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2020 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2019 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2016 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2015 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2014 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2010 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958
2009 26 CFR 20.6166A-4 – Special rules applicable where due date of return was before September 3, 1958