- Best IRS Link
- US Tax Court
- US Courts of Appeal Opinions
- Investment Planning: The Fairmark Press Tax Guide for Investors
- Return Preparation: www.TaxLogic.com
- Audit Risk Statistics: Independent analysis of IRS audit patterns
- Villanova Law School's Tax Master Gateway
- Findlaw Legal Directory: www.findlaw.com
- Tax Web Portal: www.taxweb.com
- Yahoo! Tax Center: taxes.yahoo.com