Versions of CFR > Title 26 > Chapter I > Subchapter A > Part 1 > Regulations Applicable to Returns or Claims for Refund Filed Prior to January 1, 2000 on LawServer 2024 CFR > Title 26 > Chapter I > Subchapter A > Part 1 > Regulations Applicable to Returns or Claims for Refund Filed Prior to January 1, 2000 2023 CFR > Title 26 > CHAPTER I > SUBCHAPTER A > PART 1 > Regulations Applicable to Returns or Claims for Refund Filed Prior to January 1, 2000 2022 CFR > Title 26 > Chapter I > Subchapter A > Part 1 > Regulations Applicable to Returns or Claims for Refund Filed Prior to January 1, 2000 – Regulations Applicable to Returns or Claims for Refund Filed Prior to January 1, 2000 2021 CFR > Title 26 > Chapter I > Subchapter A > Part 1 > Regulations Applicable to Returns or Claims for Refund Filed Prior to January 1, 2000 – Regulations Applicable to Returns or Claims for Refund Filed Prior to January 1, 2000