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