26 CFR Chapter I - INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY
- SUBCHAPTER A—INCOME TAX (Parts 1 - 18)
- SUBCHAPTER B—ESTATE AND GIFT TAXES (Parts 20 - 29)
- SUBCHAPTER C—EMPLOYMENT TAXES AND COLLECTION OF INCOME TAX AT SOURCE (Parts 30 - 37-39)
- SUBCHAPTER D—MISCELLANEOUS EXCISE TAXES (Parts 40 - 158-169)
- SUBCHAPTER E [RESERVED]
- PARTS 170-299 [RESERVED]
- SUBCHAPTER F—PROCEDURE AND ADMINISTRATION (Parts 300 - 421-499)
- SUBCHAPTER G—REGULATIONS UNDER TAX CONVENTIONS (Parts 500-507 - 522-599)
- SUBCHAPTER H—INTERNAL REVENUE PRACTICE (Parts 600 - 802-899)