Code of Federal Regulations > Title 26 > Chapter I - CHAPTER I—INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED)

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Regulations last checked for updates: May 01, 2026

Title 26 - Internal Revenue last revised: Apr 20, 2026

All TitlesTitle 26Chapter I - CHAPTER I—INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY (CONTINUED)

Part 50 [§ 50.1 - § 50.8] -

Part 51 [§ 51.1 - § 51.6302-1] - PART 51—BRANDED PRESCRIPTION DRUG FEE

Part 52 [§ 52.0-1 - § 52.4682-5] - PART 52—ENVIRONMENTAL TAXES

Part 53 [§ 53.4940-1 - § 53.7701-1] - PART 53—FOUNDATION AND SIMILAR EXCISE TAXES

Part 54 [§ 54.4971-1 - § 54.9833-1] - PART 54—PENSION EXCISE TAXES

Part 55 [§ 55.4981-1 - § 55.7701-1] - PART 55—EXCISE TAX ON REAL ESTATE INVESTMENT TRUSTS AND REGULATED INVESTMENT COMPANIES

Part 56 [§ 56.4911-0 - § 56.7701-1] - PART 56—PUBLIC CHARITY EXCISE TAXES

Part 57 [§ 57.1 - § 57.6302-1] - PART 57—HEALTH INSURANCE PROVIDERS FEE

Part 58 [§ 58.4501-0 - § 58.6696-1] - PART 58—STOCK REPURCHASE EXCISE TAX

Part 141 [§ 141.4975-13 - § 141.4975-13] - PART 141—TEMPORARY EXCISE TAX REGULATIONS UNDER THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974

Part 143 [§ 143.1 - § 143.6] - PART 143—TEMPORARY EXCISE TAX REGULATIONS UNDER THE TAX REFORM ACT OF 1969

Part 145 [§ 145.4051-1 - § 145.4061-1] - PART 145—TEMPORARY EXCISE TAX REGULATIONS UNDER THE HIGHWAY REVENUE ACT OF 1982 (PUB. L. 97-424)

Part 151-155 - PARTS 151-155 [RESERVED]

Part 156 [§ 156.5881-1 - § 156.7701-1] - PART 156—EXCISE TAX ON GREENMAIL

Part 157 [§ 157.5891-1 - § 157.7701-1] - PART 157—EXCISE TAX ON STRUCTURED SETTLEMENT FACTORING TRANSACTIONS

Part 158-169 - PARTS 158-169 [RESERVED]

Part 170-299 - PARTS 170-299 [RESERVED]

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