- CCH Tax Research NetWork
This database includes federal, state and international tax information. Resources include the IRS code, manual, letter rulings and positions, as well as access to tax regulations and cases.
- IRS for Tax Professionals
The IRS provides information for tax professionals including standards of practice, continuing education updates, and tips for using various filing methods.
- Congressional Joint Committee on Taxation
This site contains references to legislation its impact on tax issues.
- Internal Revenue Service
Tax information for individuals, businesses and tax professionals.