26 CFR Chapter I - INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY
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- SUBCHAPTER A - INCOME TAX (Parts 1 - 19)
- SUBCHAPTER B - ESTATE AND GIFT TAXES (Parts 20 - 27-29)
- 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)