Part 40 - Excise Tax Procedural Regulations

Part 41 - Excise Tax on Use of Certain Highway Motor Vehicles

Part 43 - Excise Tax on Transportation by Water

Part 44 - Taxes on Wagering; Effective January 1, 1955

Part 46 - Excise Tax on Certain Insurance Policies, Self-Insured Health Plans, and Obligations Not in Registered Form

Part 47 - Designated Drugs Excise Tax Regulations

Part 48 - Manufacturers and Retailers Excise Taxes

Part 49 - Facilities and Services Excise Taxes

Part 50 - Regulations Relating to the Tax Imposed With Respect to Certain Hydraulic Mining

Part 51 - Branded Prescription Drug Fee

Part 52 - Environmental Taxes

Part 53 - Foundation and Similar Excise Taxes

Part 54 - Pension Excise Taxes

Part 55 - Excise Tax on Real Estate Investment Trusts and Regulated Investment Companies

Part 56 - Public Charity Excise Taxes

Part 57 - Health Insurance Providers Fee

Part 141 - Temporary Excise Tax Regulations Under the Employee Retirement Income Security Act of 1974

Part 143 - Temporary Excise Tax Regulations Under the Tax Reform Act of 1969

Part 145 - Temporary Excise Tax Regulations Under the Highway Revenue Act of 1982 (Pub. L. 97-424)

Part 148 - Certain Excise Tax Matters Under the Excise Tax Technical Changes Act of 1958

Part 156 - Excise Tax on Greenmail

Part 157 - Excise Tax on Structured Settlement Factoring Transactions

Part 58 - Stock Repurchase Excise Tax

Parts 151--155 - [Reserved]

Parts 158--169 - [Reserved]