Chapter I — Internal Revenue Service, Department of the Treasury
- Subch. A Income Tax §§1.0-1 to 18.1379-2
- Subch. B Estate and Gift Taxes §§20.0-1 to 28.7701-1
- Subch. C Employment Taxes and Collection of Income Tax at Source §§31.0-1 to 36.3121(l)(10)-4
- Subch. D Miscellaneous Excise Taxes §§40.0-1 to 157.7701-1
- Subch. E Subchapter E [reserved]
- Pt. 170-299 Parts 170-299 [reserved]
- Subch. F Procedure and Administration §§300.0 to 420.0-1
- Subch. G Regulations under Tax Conventions §§509.101 to 521.117
- Subch. H Internal Revenue Practice §§601.101 to 801.8