The UCSB subscription to CCH Internet Tax Research NetWork includes their Federal and State Tax Libraries, as well as full text access to several CCH tax-related journals. This includes the searchable full text of the IRS Code, Tax Regulations, Case Law, Rulings, Legislative Documents, State Tax Reporters, State Tax Archives, and various CCH explanations and analysis sources.
Citators, also included, give the history of a case or ruling and later cases or rulings which cited the earlier case or ruling.
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It recommends use of Internet Explorer.
MORE FEDERAL TAX LAW SOURCES
Choose U.S. Legal from the left column, then Tax Law.
U.S. Code (IRC in v. 26)
The U.S. Code may be searched here for free. The Internal Revenue Code is volume 26 of the U.S. Code.