Cases

Australian Tax Reports
Westlaw: ATR-RPTS (1970-current)
British Tax Cases
1982-1999; subscription cancelled - LES.
Canada GSTC -- Goods and Services Tax
Canada GSTC (Westlaw: GSTC-RPTS); 1992-current
Canada Tax Cases
Westlaw: CTC-RPTS; 1917-current.
England and Wales Reported and Unreported Tax Cases
Lexis: CASES (1875-current)
India - Taxation Reports
LES
Mexican Tax Laws
Lexis: MXFISC (1900s-current)
South Africa Tax Cases
Lexis: SATC (1920-1998); not currently updated; contains decisions from the Supreme Court of South Africa, and the High and Supreme Courts of Zimbabwe.
Tax Court of Canada
Westlaw: CANTCC-CS (1983-current); Lexis: CANTCT (selected 1955-1992; complete 1993-current)
U.S. Court of International Trade Tax Cases
U.S. Court of Internatioanl Trade - Lexis: USCIT (1980-current)
U.S. Customs Court Tax Cases
U.S. Customs Court - Lexis: CUSTCT (1937-1980)
Worldwide Tax Treaties Case Law
Tax Analysts - Lexis: WWCASE; cases from over 50 countries interpreting treaty cases