2024 CFR > Title 26 > Chapter I > Subchapter A > Part 1 > ABATEMENTS, CREDITS, AND REFUNDS
2023 CFR > Title 26 > CHAPTER I > SUBCHAPTER A > PART 1 > ABATEMENTS, CREDITS, AND REFUNDS
2022 CFR > Title 26 > Chapter I > Subchapter A > Part 1 > Abatements, Credits, and Refunds – Abatements, Credits, and Refunds
2021 CFR > Title 26 > Chapter I > Subchapter A > Part 1 > ABATEMENTS, CREDITS, AND REFUNDS – ABATEMENTS, CREDITS, AND REFUNDS