26 CFR Chapter I - INTERNAL REVENUE SERVICE, DEPARTMENT OF THE TREASURY
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- SUBCHAPTER A — INCOME TAX (Parts 1 to 19)
- SUBCHAPTER B — ESTATE AND GIFT TAXES (Parts 20 to 27)
- SUBCHAPTER C — EMPLOYMENT TAXES AND COLLECTION OF INCOME TAX AT SOURCE (Parts 30 to 37)
- SUBCHAPTER D — MISCELLANEOUS EXCISE TAXES (Parts 40 to 158)
- SUBCHAPTER E — [Reserved]
- SUBCHAPTER F — PROCEDURE AND ADMINISTRATION (Parts 300 to 421)
- SUBCHAPTER G — REGULATIONS UNDER TAX CONVENTIONS (Parts 500 to 521)
- SUBCHAPTER H — INTERNAL REVENUE PRACTICE (Parts 600 to 802)